NO.11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE, SURGES [13B-MSP]

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	• The engine stops unexpectedly at the beginning of acceleration or during acceleration. • The engine stops unexpectedly while cruising. • The engine speed fluctuates during acceleration or cruising. • The engine misses during acceleration or cruising. • The vehicle bucks/jerks during acceleration, cruising, or deceleration. • The momentary pause at the beginning of acceleration or during acceleration. • The momentary minor irregularity in the engine output.
POSSIBLE CAUSE	• Drive-by-wire control system operates with brake override system (from FE10**-301152) • Vacuum leakage • Air leakage from intake-air system • Air cleaner restriction • Air suction at intake-air system (between MAF sensor and intake ports) • Improper operation of drive-by-wire control system (abnormal accelerator position and TP signals to PCM) • Throttle body malfunction (stuck close) • Improper SSV operation • Improper APV operation • Poor fuel quality • Inadequate fuel pressure • Fuel pump mechanical malfunction • Fuel leakage from fuel injector • Fuel injector clogging • Fuel line restriction or clogging • Pressure regulator (integrated in fuel pump unit) malfunction • Intermittent open or short in fuel pump body circuit • Fuel pump relay malfunction (stuck open) • Restriction in exhaust system • Purge solenoid valve malfunction • Improper air/fuel ratio control • MAF sensor improper installation • Intermittent open or short of MAF sensor, TP sensor, APP sensor and VSS • Erratic signal from eccentric shaft position sensor	• Improper ignition timing control (abnormal ECT, IAT, MAF and knock signals to PCM) • Improper fuel injection control (abnormal MAF, ECT, A/F sensor and HO2S signals to PCM) • Improper load signal (neutral/CPP switch (MT), TR switch (AT)) to PCM • Main relay intermittent malfunction • Low engine compression ― Engine internal malfunction ― Abnormal engine oil condition (viscosity, deterioration) ― Low oil pressure ― Excessive fuel injector ― Air mixed in oil line ― Metering oil pump malfunction • Leakage or clogging in oil pipe • Leakage or clogging in oil nozzle • Metering oil pump malfunction • Improper metering oil pump control operation • Engine overheating • Spark leakage from high-tension leads • Spark plug malfunction • Improper A/C system operation • Improper torque converter clutch control operation (AT) • Improper shift point (AT) • AT malfunction (AT) • Clutch slippage (MT)
Warning The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: • 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 injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE SERVICE PRECAUTION [13B-MSP].) (See AFTER SERVICE PRECAUTION [13B-MSP].) Caution • Disconnecting/connecting quick release connector without cleaning it may possibly cause damage to fuel pipe and quick release connector. Always clean 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

• The engine stops unexpectedly at the beginning of acceleration or during acceleration.

• The engine stops unexpectedly while cruising.

• The engine speed fluctuates during acceleration or cruising.

• The engine misses during acceleration or cruising.

• The vehicle bucks/jerks during acceleration, cruising, or deceleration.

• The momentary pause at the beginning of acceleration or during acceleration.

• The momentary minor irregularity in the engine output.

POSSIBLE CAUSE

• Drive-by-wire control system operates with brake override system (from FE10**-301152)

• Vacuum leakage

• Air leakage from intake-air system

• Air cleaner restriction

• Air suction at intake-air system (between MAF sensor and intake ports)

• Improper operation of drive-by-wire control system (abnormal accelerator position and TP signals to PCM)

• Throttle body malfunction (stuck close)

• Improper SSV operation

• Improper APV operation

• Poor fuel quality

• Inadequate fuel pressure

• Fuel pump mechanical malfunction

• Fuel leakage from fuel injector

• Fuel injector clogging

• Fuel line restriction or clogging

• Pressure regulator (integrated in fuel pump unit) malfunction

• Intermittent open or short in fuel pump body circuit

• Fuel pump relay malfunction (stuck open)

• Restriction in exhaust system

• Purge solenoid valve malfunction

• Improper air/fuel ratio control

• MAF sensor improper installation

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

• Erratic signal from eccentric shaft position sensor

• Improper ignition timing control (abnormal ECT, IAT, MAF and knock signals to PCM)

• Improper fuel injection control (abnormal MAF, ECT, A/F sensor and HO2S signals to PCM)

• Improper load signal (neutral/CPP switch (MT), TR switch (AT)) to PCM

• Main relay intermittent malfunction

• Low engine compression

― Engine internal malfunction

― Abnormal engine oil condition (viscosity, deterioration)

― Low oil pressure

― Excessive fuel injector

― Air mixed in oil line

― Metering oil pump malfunction

• Leakage or clogging in oil pipe

• Leakage or clogging in oil nozzle

• Metering oil pump malfunction

• Improper metering oil pump control operation

• Engine overheating

• Spark leakage from high-tension leads

• Spark plug malfunction

• Improper A/C system operation

• Improper torque converter clutch control operation (AT)

• Improper shift point (AT)

• AT malfunction (AT)

• Clutch slippage (MT)

Warning

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

• 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 injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual.

(See BEFORE SERVICE PRECAUTION [13B-MSP].)

(See AFTER SERVICE PRECAUTION [13B-MSP].)

Caution

• Disconnecting/connecting quick release connector without cleaning it may possibly cause damage to fuel pipe and quick release connector. Always clean 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 [13B-MSP]) Is the DTC P2299 present?	Yes	Go to the applicable DTC inspection. (drive-by-wire control system operates with brake override system.) (See DTC P2299 [13B-MSP].)
No	Go to the next step.
2	Does the engine knock/ping/detonate?	Yes	Go to the symptom troubleshooting “No.13 Knocking/pinging/detonation-Acceleration/cruise”. (See NO.13 KNOCKING/PINGING/DETONATION-ACCELERATION/CRUISE [13B-MSP].)
No	Go to the next step.
3	Verify the following: • Vacuum connection • Air cleaner element • No air leakage from intake-air system • No restriction of intake-air system • Blockage of intake-air system (between MAF sensor and intake ports) • Ignition wiring • Fuel quality (e.g. proper octane, contamination, winter/summer blend) • MAF sensor installation • Electrical connections • Smooth operation of throttle valve Are all the items normal?	Yes	Go to the next step.
No	Service if necessary. Repeat Step 3.
4	Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [13B-MSP].)
No	Go to the next step.
5	Is the engine overheating?	Yes	Go to the symptom troubleshooting "No.17 Cooling system concerns - Overheating". (See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [13B-MSP].)
No	Go to the next step.
6	Connect the M-MDS to the DLC-2. Access APP1, APP2, RPM, VPWR, MAF, TP_REL, O2S11, O2S12 and VSS PIDs. Drive the vehicle while monitoring PIDs. Are the PIDs within the specifications? (See PCM INSPECTION [13B-MSP].)	Yes	Go to the next step.
No	APP1, APP2 PIDs: Inspect if the output signal from the APP sensor changes smoothly. RPM PID: Inspect the eccentric shaft position sensor and the related wiring harness for vibration or an intermittent open/short circuit. If normal, go to Step 8. VPWR PID: Inspect for an intermittent open circuit. MAF PID: Inspect for an intermittent open circuit of the MAF sensor and the related wiring harness. TP_REL PID: Inspect if the output signal from the TP sensor changes smoothly. O2S11 PID: Inspect the A/F sensor and the related wiring harness for vibration or an intermittent open or short circuit or both. If normal, go to Step 9. O2S12 PID: Inspect the HO2S and the related wiring harness for vibration or an intermittent open or short circuit or both. If normal, go to Step 9. VSS PID: Inspect DSC HU/CM. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)
7	Inspect the KS. (See KNOCK SENSOR (KS) INSPECTION [13B-MSP].) Is the KS normal?	Yes	Go to the next step.
No	Replace the KS. (See KNOCK SENSOR (KS) REMOVAL/INSTALLATION [13B-MSP].)
8	Visually inspect the eccentric shaft position sensor and the teeth of the pulse wheel. Are the eccentric shaft position sensor and the teeth of the pulse wheel normal?	Yes	Go to the next step.
No	Replace the malfunctioning parts.
9	Is the strong blue spark visible at each disconnecting high-tension lead while cranking the engine?	Yes	Inspect for the following: • Spark plugs malfunction • Spark plugs heat range • Pulse wheel damaged on eccentric shaft • Open or short circuit on eccentric shaft position sensor • Open or short between eccentric shaft position sensor and PCM terminal 2AG and 2AP If they are normal, go to the next step.
No	Inspect for the following: • High-tension leads • Ignition coils or connectors
10	Inspect the spark plug conditions. (See SPARK PLUG INSPECTION [13B-MSP].) Is the spark plug wet, covered with carbon or grayish white?	Yes	Spark plug is wet or covered with carbon: Inspect for fuel leakage from the fuel injector. Spark plug is grayish white: Inspect for clogged fuel injector.
No	Install the spark plugs on original positions. Go to the next step.
11	Perform the drive-by-wire control system operation inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [13B-MSP].) Does the drive-by-wire control system work properly?	Yes	Go to the next step.
No	Repair or replace the malfunctioning part according to the drive-by-wire system operation inspection results.
12	Visually inspect the exhaust system part. Is there any deformed exhaust system part?	Yes	Replace the suspected part.
No	Go to the next step.
13	Perform the fuel pump speed control operation inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [13B-MSP].) Do the fuel injectors operate properly?	Yes	Go to the next step.
No	Repair or replace the malfunctioning parts, according to the fuel pump speed control operation inspection results.
14	Inspect the fuel line pressure. (See FUEL LINE PRESSURE INSPECTION [13B-MSP].) Is the fuel line pressure correct?	Yes	Go to the next step.
No	Zero or low: Inspect the fuel pump relay and the fuel pump circuit. Inspect for clogged fuel line. If normal, replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [13B-MSP].) High: Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [13B-MSP].)
15	Visually inspect for fuel leakage at the fuel injector, O-ring and fuel line. Service if necessary. Is the fuel line pressure held after the ignition switch is turned off? (See FUEL LINE PRESSURE INSPECTION [13B-MSP].)	Yes	Go to the next step.
No	Inspect the fuel injector. (See FUEL INJECTOR INSPECTION [13B-MSP].) If the fuel injector is normal, replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [13B-MSP].)
16	Perform the fuel injector operation inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [13B-MSP].) Are the fuel injectors operating properly?	Yes	Go to the next step.
No	Repair or replace the malfunctioning parts, according to the fuel injector operation inspection results.
17	Note • The following test is for an engine stalling with the A/C on. If other symptom exists, go to the next step. Connect a pressure gauge to the A/C low and the high pressure side lines. Turn the A/C on and measure the low side and high side pressure. Are the pressures within the specifications? (See REFRIGERANT PRESSURE CHECK.)	Yes	Go to the next step.
No	If A/C is always on, go to the symptom troubleshooting "No.24 A/C is always on or A/C compressor runs continuously". (See NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [13B-MSP].) For other symptoms, inspect the following: • Refrigerant charging amount • Condenser fan operation
18	Note • The following test should be performed for a symptom with the cruise control on. If other symptoms exist, go to the next step. Inspect the cruise control system. Is cruise control system normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning parts.
19	Perform the SSV operation inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [13B-MSP].) Does the SSV operate properly?	Yes	Go to the next step.
No	Repair or replace the malfunctioning parts, according to the SSV operation inspection results.
20	Perform the APV control inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [13B-MSP].) Does the APV control operate properly?	Yes	Go to the next step.
No	Repair or replace the malfunctioning parts, according to the APV control inspection results.
21	Disconnect the vacuum hose between the purge solenoid valve and the intake manifold at the quick release connector. Plug the opening end of the vacuum hose. Drive the vehicle. Does the engine condition improve?	Yes	Go to the next step. Inspect if the purge solenoid valve sticks open mechanically. Inspect the evaporative emission control system.
No	Go to the next step.
22	Inspect the ignition timing. (See ENGINE TUNE-UP [13B-MSP].) Does the ignition timing operate properly?	Yes	Go to the next step.
No	Repair or replace the malfunctioning parts, according to the ignition timing inspection results.
23	Perform the metering oil pump control inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [13B-MSP].) Does the metering oil pump control operate properly?	Yes	Go to the next step.
No	Repair or replace the malfunctioning parts, according to the metering oil pump control inspection results.
24	Inspect the engine compression. (See COMPRESSION INSPECTION [13B-MSP].) Is it normal?	Yes	Inspect the following: • Internal transmission components (AT) • Torque converter clutch control (AT) • Shift point (AT) • Clutch (MT) • Brake system for dragging • Engine mounts • KS
No	Go to the next step.
25	Perform the metering oil pump control inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [13B-MSP].) Does the metering oil pump control operate properly?	Yes	Go to the next step.
No	Repair or replace the malfunctioning part according to the inspection results. After that overhaul or replace the engine.
26	Check the engine oil condition. Are the engine oil low viscosity and/or is there a gasoline odor?	Yes	Replace the engine oil. After that overhaul or replace the engine.
No	Go to the next step.
27	Inspect the oil pressure. (See OIL PRESSURE INSPECTION [13B-MSP].) Is the oil pressure within the specification?	Yes	Go to the next step.
No	Repair or replace the malfunctioning part according to the inspection results. After that overhaul or replace the engine.
28	Turn the ignition switch off. Disconnect the fuel line quick release connector and the release fuel gauge to the fuel line. Start the engine and run it at idle. Measure the fuel line pressure at idle. Is the fuel line pressure correct at idle? (See FUEL LINE PRESSURE INSPECTION [13B-MSP].)	Yes	Go to the next step.
No	Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [13B-MSP].) After that overhaul or replace the engine.
29	Check the oil pipe between the metering oil pump and the metering oil nozzle. Is there air and/or clogging in the oil pipe?	Yes	Inspect and repair for leakage and/or clogging in the oil passage at engine. After that overhaul or replace the engine.
No	Overhaul or replace the engine.
30	• Verify test results. ― If normal, return to the diagnostic index to service any additional symptoms. ― If the malfunction remains, inspect related the Service Bulletins and/or the On-line Repair Information and perform the repair or diagnosis.

STEP

INSPECTION

RESULTS

ACTION

Retrieve the PCM DTC using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [13B-MSP])

Is the DTC P2299 present?

Yes

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

(See DTC P2299 [13B-MSP].)

Go to the next step.

Does the engine knock/ping/detonate?

Yes

Go to the symptom troubleshooting “No.13 Knocking/pinging/detonation-Acceleration/cruise”.

(See NO.13 KNOCKING/PINGING/DETONATION-ACCELERATION/CRUISE [13B-MSP].)

Go to the next step.

Verify the following:

• Vacuum connection

• Air cleaner element

• No air leakage from intake-air system

• No restriction of intake-air system

• Blockage of intake-air system (between MAF sensor and intake ports)

• Ignition wiring

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

• MAF sensor installation

• Electrical connections

• Smooth operation of throttle valve

Are all the items normal?

Yes

Go to the next step.

Service if necessary.

Repeat Step 3.

Connect the M-MDS to the DLC-2.

Turn the ignition switch to the ON position (Engine off).

Retrieve any DTCs.

Are there any DTCs displayed?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [13B-MSP].)

Go to the next step.

Is the engine overheating?

Yes

Go to the symptom troubleshooting "No.17 Cooling system concerns - Overheating".

(See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [13B-MSP].)

Go to the next step.

Connect the M-MDS to the DLC-2.

Access APP1, APP2, RPM, VPWR, MAF, TP_REL, O2S11, O2S12 and VSS PIDs.

Drive the vehicle while monitoring PIDs.

Are the PIDs within the specifications?

(See PCM INSPECTION [13B-MSP].)

Yes

Go to the next step.

APP1, APP2 PIDs:

Inspect if the output signal from the APP sensor changes smoothly.

RPM PID:

Inspect the eccentric shaft position sensor and the related wiring harness for vibration or an intermittent open/short circuit. If normal, go to Step 8.

VPWR PID:

Inspect for an intermittent open circuit.

MAF PID:

Inspect for an intermittent open circuit of the MAF sensor and the related wiring harness.

TP_REL PID:

Inspect if the output signal from the TP sensor changes smoothly.

O2S11 PID:

Inspect the A/F sensor and the related wiring harness for vibration or an intermittent open or short circuit or both. If normal, go to Step 9.

O2S12 PID:

Inspect the HO2S and the related wiring harness for vibration or an intermittent open or short circuit or both. If normal, go to Step 9.

VSS PID:

Inspect DSC HU/CM.

(See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)

Inspect the KS.

(See KNOCK SENSOR (KS) INSPECTION [13B-MSP].)

Is the KS normal?

Yes

Go to the next step.

Replace the KS.

(See KNOCK SENSOR (KS) REMOVAL/INSTALLATION [13B-MSP].)

Visually inspect the eccentric shaft position sensor and the teeth of the pulse wheel.

Are the eccentric shaft position sensor and the teeth of the pulse wheel normal?

Yes

Go to the next step.

Replace the malfunctioning parts.

Is the strong blue spark visible at each disconnecting high-tension lead while cranking the engine?

Yes

Inspect for the following:

• Spark plugs malfunction

• Spark plugs heat range

• Pulse wheel damaged on eccentric shaft

• Open or short circuit on eccentric shaft position sensor

• Open or short between eccentric shaft position sensor and PCM terminal 2AG and 2AP

If they are normal, go to the next step.

Inspect for the following:

• High-tension leads

• Ignition coils or connectors

Inspect the spark plug conditions.

(See SPARK PLUG INSPECTION [13B-MSP].)

Is the spark plug wet, covered with carbon or grayish white?

Yes

Spark plug is wet or covered with carbon:

Inspect for fuel leakage from the fuel injector.

Spark plug is grayish white:

Inspect for clogged fuel injector.

Install the spark plugs on original positions.

Go to the next step.

Perform the drive-by-wire control system operation inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [13B-MSP].)

Does the drive-by-wire control system work properly?

Yes

Go to the next step.

Repair or replace the malfunctioning part according to the drive-by-wire system operation inspection results.

Visually inspect the exhaust system part.

Is there any deformed exhaust system part?

Yes

Replace the suspected part.

Go to the next step.

Perform the fuel pump speed control operation inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [13B-MSP].)

Do the fuel injectors operate properly?

Yes

Go to the next step.

Repair or replace the malfunctioning parts, according to the fuel pump speed control operation inspection results.

Inspect the fuel line pressure.

(See FUEL LINE PRESSURE INSPECTION [13B-MSP].)

Is the fuel line pressure correct?

Yes

Go to the next step.

Zero or low:

Inspect the fuel pump relay and the fuel pump circuit.

Inspect for clogged fuel line.

If normal, replace the fuel pump unit.

(See FUEL PUMP UNIT REMOVAL/INSTALLATION [13B-MSP].)

High:

Replace the fuel pump unit.

(See FUEL PUMP UNIT REMOVAL/INSTALLATION [13B-MSP].)

Visually inspect for fuel leakage at the fuel injector, O-ring and fuel line.

Service if necessary.

Is the fuel line pressure held after the ignition switch is turned off?

(See FUEL LINE PRESSURE INSPECTION [13B-MSP].)

Yes

Go to the next step.

Inspect the fuel injector.

(See FUEL INJECTOR INSPECTION [13B-MSP].)

If the fuel injector is normal, replace the fuel pump unit.

(See FUEL PUMP UNIT REMOVAL/INSTALLATION [13B-MSP].)

Perform the fuel injector operation inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [13B-MSP].)

Are the fuel injectors operating properly?

Yes

Go to the next step.

Repair or replace the malfunctioning parts, according to the fuel injector operation inspection results.

Note

• The following test is for an engine stalling with the A/C on. If other symptom exists, go to the next step.

Connect a pressure gauge to the A/C low and the high pressure side lines.

Turn the A/C on and measure the low side and high side pressure.

Are the pressures within the specifications?

(See REFRIGERANT PRESSURE CHECK.)

Yes

Go to the next step.

If A/C is always on, go to the symptom troubleshooting "No.24 A/C is always on or A/C compressor runs continuously".

(See NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [13B-MSP].)

For other symptoms, inspect the following:

• Refrigerant charging amount

• Condenser fan operation

Note

• The following test should be performed for a symptom with the cruise control on. If other symptoms exist, go to the next step.

Inspect the cruise control system.

Is cruise control system normal?

Yes

Go to the next step.

Repair or replace the malfunctioning parts.

Perform the SSV operation inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [13B-MSP].)

Does the SSV operate properly?

Yes

Go to the next step.

Repair or replace the malfunctioning parts, according to the SSV operation inspection results.

Perform the APV control inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [13B-MSP].)

Does the APV control operate properly?

Yes

Go to the next step.

Repair or replace the malfunctioning parts, according to the APV control inspection results.

Disconnect the vacuum hose between the purge solenoid valve and the intake manifold at the quick release connector.

Plug the opening end of the vacuum hose.

Drive the vehicle.

Does the engine condition improve?

Yes

Go to the next step.

Inspect if the purge solenoid valve sticks open mechanically.

Inspect the evaporative emission control system.

Go to the next step.

Inspect the ignition timing.

(See ENGINE TUNE-UP [13B-MSP].)

Does the ignition timing operate properly?

Yes

Go to the next step.

Repair or replace the malfunctioning parts, according to the ignition timing inspection results.

Perform the metering oil pump control inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [13B-MSP].)

Does the metering oil pump control operate properly?

Yes

Go to the next step.

Repair or replace the malfunctioning parts, according to the metering oil pump control inspection results.

Inspect the engine compression.

(See COMPRESSION INSPECTION [13B-MSP].)

Is it normal?

Yes

Inspect the following:

• Internal transmission components (AT)

• Torque converter clutch control (AT)

• Shift point (AT)

• Clutch (MT)

• Brake system for dragging

• Engine mounts

• KS

Go to the next step.

Perform the metering oil pump control inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [13B-MSP].)

Does the metering oil pump control operate properly?

Yes

Go to the next step.

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

After that overhaul or replace the engine.

Check the engine oil condition.

Are the engine oil low viscosity and/or is there a gasoline odor?

Yes

Replace the engine oil.

After that overhaul or replace the engine.

Go to the next step.

Inspect the oil pressure.

(See OIL PRESSURE INSPECTION [13B-MSP].)

Is the oil pressure within the specification?

Yes

Go to the next step.

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

After that overhaul or replace the engine.

Turn the ignition switch off.

Disconnect the fuel line quick release connector and the release fuel gauge to the fuel line.

Start the engine and run it at idle.

Measure the fuel line pressure at idle.

Is the fuel line pressure correct at idle?

(See FUEL LINE PRESSURE INSPECTION [13B-MSP].)

Yes

Go to the next step.

Replace the fuel pump unit.

(See FUEL PUMP UNIT REMOVAL/INSTALLATION [13B-MSP].)

After that overhaul or replace the engine.

Check the oil pipe between the metering oil pump and the metering oil nozzle.

Is there air and/or clogging in the oil pipe?

Yes

Inspect and repair for leakage and/or clogging in the oil passage at engine.

After that overhaul or replace the engine.

Overhaul or replace the engine.

• Verify test results.

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

― If the malfunction remains, inspect related the Service Bulletins and/or the On-line Repair Information and perform the repair or diagnosis.