NO.11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE, SURGES [MZR 2.3 DISI Turbo]

11	ENGINE STALLS/QUITS—ACCELERATION/CRUISE ENGINE RUNS ROUGH—ACCELERATION/CRUISE MISSES—ACCELERATION/CRUISE BUCK/JERK—ACCELERATION/CRUISE/DECELERATION HESITATION/STUMBLE—ACCELERATION SURGES—ACCELERATION/CRUISE
DESCRIPTION	• Engine stops unexpectedly at beginning of acceleration or during acceleration. • Engine stops unexpectedly while cruising. • Engine speed fluctuates during acceleration or cruising. • Engine misses during acceleration or cruising. • Vehicle bucks/jerks during acceleration, cruising, or deceleration. • Momentary pause at beginning of acceleration or during acceleration. • Momentary minor irregularity in engine output.
POSSIBLE CAUSE	• Drive-by-wire control system operates with brake override system • Improper operation of A/C system • Air leakage from intake-air system • Intake-air system restriction • Purge solenoid valve malfunction • Improper operation of electronic throttle control system • EGR system malfunction • Low engine compression • Turbocharger malfunction • Improper operation of wastegate control system • Vacuum leakage • Poor fuel quality • Main relay intermittent malfunction • Throttle body malfunction • Engine overheating • Spark plug malfunction • Variable swirl system malfunction • Air cleaner restriction • PCV valve malfunction • Improper valve timing due to jumping out timing chain • Exhaust system and/or TWC restriction • Intermittent open or short circuit in fuel pump circuit • Incorrect fuel injection timing • Inadequate fuel pressure (high or low pressure side) • Fuel pressure sensor (built-in fuel delivery pipe) malfunction • Spill valve control solenoid valve malfunction (built-in high pressure fuel pump) • Relief valve malfunction (built-in delivery pipe) • High pressure fuel pump malfunction • Fuel injector malfunction • Improper fuel pump speed control operation • Fuel pump mechanical malfunction • Fuel line restriction or clogging • Improper air/fuel mixture ratio control operation • Erratic or no signal from CMP sensor • Erratic signal from CKP sensor • A/F sensor, HO2S or related circuit malfunction • APP sensor or related circuit malfunction • ECT sensor or related circuit malfunction • MAF sensor (integrated in MAF/IAT sensor) or related circuit malfunction • IAT sensor (integrated in MAF/IAT sensor) or related circuit malfunction • MAP sensor (integrated in MAP sensor/boost air temperature sensor) or related circuit malfunction • Boost air temperature sensor (integrated in MAP sensor/boost air temperature sensor) or related circuit malfunction • Intermittent open or short circuit MAF sensor, APP sensor, TP sensor and VSS • Clutch slippage Warning • The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services: ― Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. ― Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injury or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” described in this manual. (See BEFORE SERVICE PRECAUTION [MZR 2.3 DISI Turbo].) (See AFTER SERVICE PRECAUTION [MZR 2.3 DISI Turbo].) Caution • Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

ENGINE STALLS/QUITS—ACCELERATION/CRUISE

ENGINE RUNS ROUGH—ACCELERATION/CRUISE

MISSES—ACCELERATION/CRUISE

BUCK/JERK—ACCELERATION/CRUISE/DECELERATION

HESITATION/STUMBLE—ACCELERATION

SURGES—ACCELERATION/CRUISE

DESCRIPTION

• Engine stops unexpectedly at beginning of acceleration or during acceleration.

• Engine stops unexpectedly while cruising.

• Engine speed fluctuates during acceleration or cruising.

• Engine misses during acceleration or cruising.

• Vehicle bucks/jerks during acceleration, cruising, or deceleration.

• Momentary pause at beginning of acceleration or during acceleration.

• Momentary minor irregularity in engine output.

POSSIBLE CAUSE

• Drive-by-wire control system operates with brake override system

• Improper operation of A/C system

• Air leakage from intake-air system

• Intake-air system restriction

• Purge solenoid valve malfunction

• Improper operation of electronic throttle control system

• EGR system malfunction

• Low engine compression

• Turbocharger malfunction

• Improper operation of wastegate control system

• Vacuum leakage

• Poor fuel quality

• Main relay intermittent malfunction

• Throttle body malfunction

• Engine overheating

• Spark plug malfunction

• Variable swirl system malfunction

• Air cleaner restriction

• PCV valve malfunction

• Improper valve timing due to jumping out timing chain

• Exhaust system and/or TWC restriction

• Intermittent open or short circuit in fuel pump circuit

• Incorrect fuel injection timing

• Inadequate fuel pressure (high or low pressure side)

• Fuel pressure sensor (built-in fuel delivery pipe) malfunction

• Spill valve control solenoid valve malfunction (built-in high pressure fuel pump)

• Relief valve malfunction (built-in delivery pipe)

• High pressure fuel pump malfunction

• Fuel injector malfunction

• Improper fuel pump speed control operation

• Fuel pump mechanical malfunction

• Fuel line restriction or clogging

• Improper air/fuel mixture ratio control operation

• Erratic or no signal from CMP sensor

• Erratic signal from CKP sensor

• A/F sensor, HO2S or related circuit malfunction

• APP sensor or related circuit malfunction

• ECT sensor or related circuit malfunction

• MAF sensor (integrated in MAF/IAT sensor) or related circuit malfunction

• IAT sensor (integrated in MAF/IAT sensor) or related circuit malfunction

• MAP sensor (integrated in MAP sensor/boost air temperature sensor) or related circuit malfunction

• Boost air temperature sensor (integrated in MAP sensor/boost air temperature sensor) or related circuit malfunction

• Intermittent open or short circuit MAF sensor, APP sensor, TP sensor and VSS

• Clutch slippage

Warning

• The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services:

― Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.

― Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injury or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” described in this manual. (See BEFORE SERVICE PRECAUTION [MZR 2.3 DISI Turbo].) (See AFTER SERVICE PRECAUTION [MZR 2.3 DISI Turbo].)

Caution

• Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

STEP	INSPECTION	RESULTS	ACTION
1	Retrieve the PCM DTC using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo]) Is the DTC P2299:00 present?	Yes	Go to the applicable DTC inspection. (drive-by-wire control system operates with brake override system.) (See DTC P2299:00 [MZR 2.3 DISI Turbo])
No	Go to the next step.
2	Inspect for the following: • Fuel quality (proper octane, contamination, winter/summer blend) • Air leakage from intake-air system • Intake-air system restriction • Air cleaner element • Fuel leakage from fuel line • Clutch slippage • Vacuum leakage Is there any malfunction?	Yes	Service if necessary. • Repeat this step.
No	Go to the next step.
3	Switch the ignition to ON. Retrieve any DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 2.3 DISI Turbo].)
No	Go to the next step.
4	Access the ECT PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].) Verify that the ECT PID value is less than 116 °C {241 °F} during driving. Is the ECT PID value less than specified? (See PCM INSPECTION [MZR 2.3 DISI Turbo].)	Yes	Go to the next step.
No	The cause of this concern could be from the cooling system overheating. • Perform the symptom troubleshooting “NO.17 COOLING SYSTEM CONCERNS-OVERHEATING”. (See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [MZR 2.3 DISI Turbo].)
5	Perform the Main Relay Operation Inspection with wiggle the related harness. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].) Does the main relay operate properly?	Yes	Go to the next step.
No	Repair or replace the malfunctioning parts according to the inspection results.
6	Inspect the CMP sensor and CKP sensor for the following: • Installation condition (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].) (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].) • Damaged trigger wheel and camshaft • Open or short circuit in the wiring harnesses Is there any malfunction?	Yes	Repair or replace the malfunctioning parts according to the inspection results.
No	Go to the next step.
7	Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].) • APP1 • APP2 • BAT • CPP • CPP/PNP • ECT • MAF • IAT • MAP • FP • VSS • O2S11 • O2S12 • LONGFT1 • SHTFT1 Do the PID values indicate the correct values under the trouble condition? (See PCM INSPECTION [MZR 2.3 DISI Turbo].)	Yes	Go to the next step.
No	Inspect the suspected parts and related wiring harness. • If normal: ― Perform the “INTERMITTENT CONCERN TROUBLESHOOTING. (See INTERMITTENT CONCERN TROUBLESHOOTING [MZR 2.3 DISI Turbo].) • If not: ― Repair or replace the malfunctioning parts according to the inspection results.
8	Perform the EGR Control System Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].) Does the EGR system operate properly?	Yes	Go to the next step.
No	Repair or replace the malfunctioning parts according to the inspection results.
9	Perform the A/C Cut-off Control System Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].) Does the A/C cut-off operation work properly?	Yes	Go to the next step.
No	Repair or replace the malfunctioning parts according to the inspection results.
10	Perform the TP sweep inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].) Does the electronic throttle control system work properly?	Yes	Visually inspect the throttle body (damage/scratching). • If normal: ― Go to the next step. • If not: ― Repair or replace the malfunctioning parts according to the inspection results.
No	Repair or replace the malfunctioning parts according to the inspection results.
11	Perform the Variable Swirl System Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].) Does the variable swirl system work properly?	Yes	Go to the next step.
No	Repair or replace the malfunctioning parts according to the inspection results.
12	Perform the Purge Control System Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].) Does the purge solenoid valve work properly?	Yes	Go to the next step.
No	Repair or replace the malfunctioning parts according to the inspection results.
13	Perform the Fuel Pump Speed Control Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].) Does the fuel pump speed control work properly?	Yes	Go to the next step.
No	Repair or replace the malfunctioning parts according to the inspection results.
14	Perform the Wastegate Control System Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].) Does the wastegate control system work properly?	Yes	Go to the next step.
No	Repair or replace the malfunctioning parts according to the inspection results.
15	Remove the parts necessary to inspect the turbocharger without removing the turbocharger. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].) Inspect if the turbocharger compressor wheel is bent, damaged, or interfering with housing on vehicle. (See TURBOCHARGER INSPECTION [MZR 2.3 DISI Turbo].) Is there any malfunction?	Yes	Replace the turbocharger. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)
No	Go to the next step.
16	Inspect the turbocharger compressor wheel locknut is loose or has fallen down inside the turbocharger. Is there any malfunction?	Yes	Replace the turbocharger. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)
No	Go to the next step.
17	Inspect the turbocharger compressor wheel by hand. Does the wheel turn easily and smoothly?	Yes	Go to the next step.
No	Replace the turbocharger. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)
18	Inspect the turbocharger turbine wheel is damaged, cracked or interfering with housing on vehicle. Note • Inspect all fins on each turbine wheel. Is there any malfunction?	Yes	Replace the turbocharger. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)
No	Go to the next step.
19	Is any engine oil found inside the turbocharger turbine housing?	Yes	Excessive amount of oil is found: • Replace the turbocharger. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].) Small amount of oil is found: • Wipe the oil out of the vehicle, then go to the next step.
No	Go to the next step.
20	Is any engine oil found inside the turbocharger compressor housing?	Yes	Wipe the oil out of the vehicle and install all removed parts in Step 15, then go to the next step.
No	Turbocharger is normal: • Install all removed parts in Step 15, then go to the next step.
21	Inspect for restriction in the exhaust system and TWC. Is there any restriction?	Yes	Repair or replace the malfunctioning parts according to the inspection results.
No	Go to the next step.
22	Perform the Spark Test. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].) Is a strong blue spark visible at each cylinder?	Yes	Go to the next step.
No	Repair or replace the malfunctioning parts according to the inspection results.
23	Access the FUEL_PRES PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].) Is the FUEL_PRES PID value within the specification? (See PCM INSPECTION [MZR 2.3 DISI Turbo].)	Yes	Go to Step 25.
No	Go to the next step.
24	Replace the high pressure fuel pump. (See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].) Access the FUEL_PRES PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].) Is the FUEL_PRES PID value within the specified? (See PCM INSPECTION [MZR 2.3 DISI Turbo].)	Yes	High-pressure fuel pump or spill valve control solenoid valve (built-in high pressure fuel pump) malfunction.
No	Relief valve or fuel pressure sensor malfunction. • Replace the fuel delivery pipe. (See FUEL INJECTOR REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)
25	Connect the fuel pressure gauge between the fuel pump and the high pressure fuel pump. Measure the fuel pressure line of the low pressure side. (See FUEL LINE PRESSURE INSPECTION [MZR 2.3 DISI Turbo].) Is the fuel pressure within the specification?	Yes	Go to the next step.
No	Inspect for the following: • Fuel line restriction • Fuel filter clogging • If normal: ― Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].) • If not: ― Repair or replace the malfunctioning parts according to the inspection results.
26	Perform the Fuel Injector Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].) Do the fuel injectors operate normally?	Yes	Go to the next step.
No	Repair or replace the malfunctioning parts according to the inspection results.
27	Measure the compression pressure for each cylinder. (See COMPRESSION INSPECTION [MZR 2.3 DISI Turbo].) Are compression pressures within the specification?	Yes	Go to the next step.
No	Inspect for the following: • Damaged valve seat • Worn valve stem and valve guide • Worn or stuck piston ring • Worn piston, piston ring or cylinder • Improper valve timing Repair or replace the malfunctioning parts according to the inspection results.
28	Inspect the PCV valve. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [MZR 2.3 DISI Turbo].) Is there any malfunction?	Yes	Replace the PCV valve. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)
No	Replace the PCM (injector driver circuit malfunction). (See PCM REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].) • If a malfunction remains: ― Repair or replace the malfunctioning part according to the inspection results.
29	Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. • If a malfunction remains, inspect the related Service Information and perform the repair or diagnosis. ― If the vehicle is repaired, troubleshooting is completed. ― If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.

STEP

INSPECTION

RESULTS

ACTION

Retrieve the PCM DTC using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo])

Is the DTC P2299:00 present?

Yes

Go to the applicable DTC inspection. (drive-by-wire control system operates with brake override system.)

(See DTC P2299:00 [MZR 2.3 DISI Turbo])

Go to the next step.

Inspect for the following:

• Fuel quality (proper octane, contamination, winter/summer blend)

• Air leakage from intake-air system

• Intake-air system restriction

• Air cleaner element

• Fuel leakage from fuel line

• Clutch slippage

• Vacuum leakage

Is there any malfunction?

Yes

Service if necessary.

• Repeat this step.

Go to the next step.

Switch the ignition to ON.

Retrieve any DTCs using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].)

Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [MZR 2.3 DISI Turbo].)

Go to the next step.

Access the ECT PID using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].)

Verify that the ECT PID value is less than 116 °C {241 °F} during driving.

Is the ECT PID value less than specified?

(See PCM INSPECTION [MZR 2.3 DISI Turbo].)

Yes

Go to the next step.

The cause of this concern could be from the cooling system overheating.

• Perform the symptom troubleshooting “NO.17 COOLING SYSTEM CONCERNS-OVERHEATING”.

(See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [MZR 2.3 DISI Turbo].)

Perform the Main Relay Operation Inspection with wiggle the related harness.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].)

Does the main relay operate properly?

Yes

Go to the next step.

Repair or replace the malfunctioning parts according to the inspection results.

Inspect the CMP sensor and CKP sensor for the following:

• Installation condition

(See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)

(See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)

• Damaged trigger wheel and camshaft

• Open or short circuit in the wiring harnesses

Is there any malfunction?

Yes

Repair or replace the malfunctioning parts according to the inspection results.

Go to the next step.

Access the following PIDs using the M-MDS:

(See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].)

• APP1

• APP2

• BAT

• CPP

• CPP/PNP

• ECT

• MAF

• IAT

• MAP

• FP

• VSS

• O2S11

• O2S12

• LONGFT1

• SHTFT1

Do the PID values indicate the correct values under the trouble condition?

(See PCM INSPECTION [MZR 2.3 DISI Turbo].)

Yes

Go to the next step.

Inspect the suspected parts and related wiring harness.

• If normal:

― Perform the “INTERMITTENT CONCERN TROUBLESHOOTING.

(See INTERMITTENT CONCERN TROUBLESHOOTING [MZR 2.3 DISI Turbo].)

• If not:

― Repair or replace the malfunctioning parts according to the inspection results.

Perform the EGR Control System Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].)

Does the EGR system operate properly?

Yes

Go to the next step.

Repair or replace the malfunctioning parts according to the inspection results.

Perform the A/C Cut-off Control System Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].)

Does the A/C cut-off operation work properly?

Yes

Go to the next step.

Repair or replace the malfunctioning parts according to the inspection results.

Perform the TP sweep inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].)

Does the electronic throttle control system work properly?

Yes

Visually inspect the throttle body (damage/scratching).

• If normal:

― Go to the next step.

• If not:

― Repair or replace the malfunctioning parts according to the inspection results.

Repair or replace the malfunctioning parts according to the inspection results.

Perform the Variable Swirl System Operation Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].)

Does the variable swirl system work properly?

Yes

Go to the next step.

Repair or replace the malfunctioning parts according to the inspection results.

Perform the Purge Control System Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].)

Does the purge solenoid valve work properly?

Yes

Go to the next step.

Repair or replace the malfunctioning parts according to the inspection results.

Perform the Fuel Pump Speed Control Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].)

Does the fuel pump speed control work properly?

Yes

Go to the next step.

Repair or replace the malfunctioning parts according to the inspection results.

Perform the Wastegate Control System Operation Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].)

Does the wastegate control system work properly?

Yes

Go to the next step.

Repair or replace the malfunctioning parts according to the inspection results.

Remove the parts necessary to inspect the turbocharger without removing the turbocharger.

(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)

Inspect if the turbocharger compressor wheel is bent, damaged, or interfering with housing on vehicle.

(See TURBOCHARGER INSPECTION [MZR 2.3 DISI Turbo].)

Is there any malfunction?

Yes

Replace the turbocharger.

(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)

Go to the next step.

Inspect the turbocharger compressor wheel locknut is loose or has fallen down inside the turbocharger.

Is there any malfunction?

Yes

Replace the turbocharger.

(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)

Go to the next step.

Inspect the turbocharger compressor wheel by hand.

Does the wheel turn easily and smoothly?

Yes

Go to the next step.

Replace the turbocharger.

(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)

Inspect the turbocharger turbine wheel is damaged, cracked or interfering with housing on vehicle.

Note

• Inspect all fins on each turbine wheel.

Is there any malfunction?

Yes

Replace the turbocharger.

(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)

Go to the next step.

Is any engine oil found inside the turbocharger turbine housing?

Yes

Excessive amount of oil is found:

• Replace the turbocharger.

(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)

Small amount of oil is found:

• Wipe the oil out of the vehicle, then go to the next step.

Go to the next step.

Is any engine oil found inside the turbocharger compressor housing?

Yes

Wipe the oil out of the vehicle and install all removed parts in Step 15, then go to the next step.

Turbocharger is normal:

• Install all removed parts in Step 15, then go to the next step.

Inspect for restriction in the exhaust system and TWC.

Is there any restriction?

Yes

Repair or replace the malfunctioning parts according to the inspection results.

Go to the next step.

Perform the Spark Test.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].)

Is a strong blue spark visible at each cylinder?

Yes

Go to the next step.

Repair or replace the malfunctioning parts according to the inspection results.

Access the FUEL_PRES PID using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].)

Is the FUEL_PRES PID value within the specification?

(See PCM INSPECTION [MZR 2.3 DISI Turbo].)

Yes

Go to Step 25.

Go to the next step.

Replace the high pressure fuel pump.

(See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)

Access the FUEL_PRES PID using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].)

Is the FUEL_PRES PID value within the specified?

(See PCM INSPECTION [MZR 2.3 DISI Turbo].)

Yes

High-pressure fuel pump or spill valve control solenoid valve (built-in high pressure fuel pump) malfunction.

Relief valve or fuel pressure sensor malfunction.

• Replace the fuel delivery pipe.

(See FUEL INJECTOR REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)

Connect the fuel pressure gauge between the fuel pump and the high pressure fuel pump.

Measure the fuel pressure line of the low pressure side.

(See FUEL LINE PRESSURE INSPECTION [MZR 2.3 DISI Turbo].)

Is the fuel pressure within the specification?

Yes

Go to the next step.

Inspect for the following:

• Fuel line restriction

• Fuel filter clogging

• If normal:

― Replace the fuel pump unit.

(See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)

• If not:

― Repair or replace the malfunctioning parts according to the inspection results.

Perform the Fuel Injector Operation Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].)

Do the fuel injectors operate normally?

Yes

Go to the next step.

Repair or replace the malfunctioning parts according to the inspection results.

Measure the compression pressure for each cylinder.

(See COMPRESSION INSPECTION [MZR 2.3 DISI Turbo].)

Are compression pressures within the specification?

Yes

Go to the next step.

Inspect for the following:

• Damaged valve seat

• Worn valve stem and valve guide

• Worn or stuck piston ring

• Worn piston, piston ring or cylinder

• Improper valve timing

Repair or replace the malfunctioning parts according to the inspection results.

Inspect the PCV valve.

(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [MZR 2.3 DISI Turbo].)

Is there any malfunction?

Yes

Replace the PCV valve.

(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)

Replace the PCM (injector driver circuit malfunction).

(See PCM REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)

• If a malfunction remains:

― Repair or replace the malfunctioning part according to the inspection results.

Verify test results.

• If normal, return to the diagnostic index to service any additional symptoms.

• If a malfunction remains, inspect the related Service Information and perform the repair or diagnosis.

― If the vehicle is repaired, troubleshooting is completed.

― If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.