NO.5 ENGINE STALLS-AFTER START/AT IDLE [L3 Turbo]

5	ENGINE STALLS-AFTER START/AT IDLE
DESCRIPTION	• Engine stops unexpectedly.
POSSIBLE CAUSE	• A/C system improper operation • Air leakage from intake-air system • Purge solenoid valve malfunction • Improper operation of electronic throttle control system • EGR valve malfunction • Vacuum leakage • Engine overheating • Low engine compression • Ignition system malfunction • Poor fuel quality • PCV valve malfunction • Intake-air system restriction • Exhaust system and/or three-way catalytic converter (TWC) restriction or clogging • Electrical connector disconnection • Open or short circuit in the fuel pump (low-side) body or related wiring harness • Fuel pump resister or related circuit malfunction • No battery power supply to PCM or poor ground • Inadequate fuel pressure (high or low pressure side) • Fuel pressure sensor or related circuit malfunction • Spill valve control solenoid valve malfunction (built-in high pressure fuel pump) • Relief valve malfunction (built-in delivery pipe) • Fuel pump (low-side) body mechanical malfunction • Fuel leakage • Fuel line restriction • Fuel filter clogging • Incorrect fuel injection timing • High pressure fuel pump malfunction • Fuel injector malfunction • Ignition coil malfunction • Improper air fuel mixture ratio control • No signal from CKP sensor due to sensor, related wiring harness or wrong installation • Erratic signal from CMP sensor • A/F sensor, HO2S or related circuit malfunction • ECT sensor or related circuit malfunction • Accelerator positions sensor or related circuit malfunction • MAF sensor or related circuit malfunction • Improper valve timing • Improper operation variable valve timing control system • Immobilizer system and/or circuit malfunction 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 [L3 Turbo].) (See AFTER SERVICE PRECAUTION [L3 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-AFTER START/AT IDLE

DESCRIPTION

• Engine stops unexpectedly.

POSSIBLE CAUSE

• A/C system improper operation

• Air leakage from intake-air system

• Purge solenoid valve malfunction

• Improper operation of electronic throttle control system

• EGR valve malfunction

• Vacuum leakage

• Engine overheating

• Low engine compression

• Ignition system malfunction

• Poor fuel quality

• PCV valve malfunction

• Intake-air system restriction

• Exhaust system and/or three-way catalytic converter (TWC) restriction or clogging

• Electrical connector disconnection

• Open or short circuit in the fuel pump (low-side) body or related wiring harness

• Fuel pump resister or related circuit malfunction

• No battery power supply to PCM or poor ground

• Inadequate fuel pressure (high or low pressure side)

• Fuel pressure sensor or related circuit malfunction

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

• Relief valve malfunction (built-in delivery pipe)

• Fuel pump (low-side) body mechanical malfunction

• Fuel leakage

• Fuel line restriction

• Fuel filter clogging

• Incorrect fuel injection timing

• High pressure fuel pump malfunction

• Fuel injector malfunction

• Ignition coil malfunction

• Improper air fuel mixture ratio control

• No signal from CKP sensor due to sensor, related wiring harness or wrong installation

• Erratic signal from CMP sensor

• A/F sensor, HO2S or related circuit malfunction

• ECT sensor or related circuit malfunction

• Accelerator positions sensor or related circuit malfunction

• MAF sensor or related circuit malfunction

• Improper valve timing

• Improper operation variable valve timing control system

• Immobilizer system and/or circuit malfunction

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 [L3 Turbo].)

(See AFTER SERVICE PRECAUTION [L3 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	Connect the M-MDS to the DLC-2. Do any of the following conditions appear? • Engine does not start completely. • DTC B1681 is displayed.	Yes	Both conditions are appear: Go to Step 5.
No	Either or other condition appears: Go to the next step.
2	Does the engine stall after approx. 2s from when it is started?	Yes	Go to the next step.
No	Is the immobilizer system is normal? Go to Step 16.
3	Is the coil connector securely connected to coil?	Yes	Go to the next step.
No	Connect the connector securely, retest from Step 2.
4	Does the security light illuminate?	Yes	Go to the next step.
No	Inspect and repair or replace the following: • Wiring harnesses and connectors from PCM terminal 1AI and instrument cluster terminal 1K • Wiring harnesses and connectors from PCM terminal 1AM and instrument cluster terminal 1I (See INSTRUMENT CLUSTER INSPECTION.)
5	Retrieve the DTC using the M-MDS. Are any of the following DTCs present? DTC B1213, B1342, B1600, B1601, B1602, B1681, B2103, B2431	Yes	Go to appropriate DTC test. (See DTC TABLE [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)])
No	Advanced keyless entry system is not equipped: Go to the next step. Advanced keyless entry system is equipped: Go to Step 11.
6	Is there continuity between PCM terminal 1BB, 1BH, 1BD, 1BG, 1AZ and ground?	Yes	Go to the next step.
No	Repair or replace the wiring harness.
7	Turn the ignition switch to the ON position (Engine off.) Measure the voltage between PCM terminal1BB, 1BH, 1BD, 1BG, 1AZ and ground. Is the voltage below 1.0V?	Yes	Go to the next step.
No	Repair or replace the wiring harness.
8	Turn the ignition switch to the ON position. (Engine off) Access the VPWR PID. Is the VPWR PID normal? VPWR PID Battery voltage	Yes	Go to the next step.
No	Repair or replace the wiring harness.
9	Disconnect the coil connector. Turn the ignition switch to the ON position. (Engine off) Is there battery voltage at coil connector terminal D?	Yes	Go to the next step.
No	Repair or replace the wiring harness between coil connector terminal D and the fuse panel.
10	Inspect the following wiring harness and connectors. • Between coil terminal A and keyless CM terminal 3V • Between coil terminal B and keyless CM terminal 3U Is there any malfunction (open or short circuit, terminal corrosion, etc.)?	Yes	Repair or replace malfunction part.
No	Go to the next step.
11	Is there continuity between the keyless CM harness-side connector terminal 2B and body ground?	Yes	Go to the next step.
No	Repair or replace the wiring harness.
12	Turn the ignition switch to the ON position. Measure the voltage between keyless CM harness-side connector terminal 2B and body ground. Is the voltage below 1.0V?	Yes	Go to the next step.
No	Repair or replace the wiring harness.
13	Turn the ignition switch to the ON position. (Engine off.) Measure the voltage between keyless CM harness-side connector terminal 2A, 2C, 2E and body ground. Is the voltage B+?	Yes	Go to the next step.
No	Repair or replace the wiring harness.
14	Turn the ignition switch off. Disconnect the coil connector. Turn the ignition switch to the ON position. (Engine off.) Measure the voltage between coil harness-side connector terminal D and body ground. Is the voltage B+?	Yes	Go to the next step.
No	Repair or replace the wiring harness.
15	Inspect the following wiring harnesses and connectors. • Between keyless CM terminal 3V and coil A • Between keyless CM terminal 3U and coil B • Between keyless CM terminal 3X and PCM 1AM • Between keyless CM terminal 3W and PCM 1AI Is there any malfunction (open or short circuit, terminal corrosion, etc.)?	Yes	Repair or replace malfunctioning part.
No	Go to the next step.
16	Inspect for the following: • Fuel quality (proper octane, contamination, winter/summer blend) • Intake-air system leakage and restriction • Electrical connectors • Poor connection for PCM ground and body ground • Fuel leakage • Vacuum leakage Are all items normal?	Yes	Go to the next step.
No	Service if necessary. Repeat Step 16.
17	Perform the self-test function using M-MDS. Turn the ignition switch to the ON position. Retrieve any DTCs. Is the DTC displayed?	Yes	DTC is displayed: Go to the appropriate DTC test. (See DTC TABLE [L3 Turbo].)
No	No DTC is displayed: Go to the next step.
18	Access the ECT PID using the M-MDS. Verify that the ECT PID is less than 116 °C {241 °F} during driving. Is the ECT PID less than specified?	Yes	Go to the next step.
No	The cause of this concern could from be cooling system overheating. Perform the symptom troubleshooting "NO.17 COOLING SYSTEM CONCERNS - OVERHEATING." (See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [L3 Turbo].)
19	Access the VPWR PID. Turn the ignition switch to the ON position. (Engine off) Does the VPWR PID indicate B+?	Yes	Go to the next step.
No	Repair or replace the wiring harness between main relay terminal C and PCM terminal 2Y and 1D.
20	Perform the A/C Cut-off Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].) Does the A/C Cut-off Operation work properly?	Yes	Go to the next step.
No	Repair or replace malfunctioning parts according to the inspection results.
21	Will the engine run smoothly at part throttle?	Yes	Go to the next step.
No	Go to Step 23.
22	Perform the TP sweep inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].) Does the electronic throttle control system work properly?	Yes	Visually inspect the throttle body (damaged/scratching.) If normal, go to the next step.
No	Inspect or replace the malfunctioning parts, according to the inspection results.
23	Perform the EGR system operation inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].) Does EGR system operate properly?	Yes	Go to the next step.
No	Inspect or replace the malfunctioning parts, according to the inspection results.
24	Perform the Purge Control System Operation inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].) Does the purge solenoid valve work properly?	Yes	Go to the next step.
No	Inspect or replace the malfunctioning parts, according to the inspection results.
25	Perform the Variable Valve Timing Control System Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].) Does the variable valve timing control system work properly?	Yes	Inspect the valve timing.
No	Inspect or replace the malfunctioning parts, according to the inspection results.
26	Inspect the CMP and CKP sensor for the following; • Installation condition (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [L3 Turbo].) (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [L3 Turbo].) • Damaged trigger wheel and camshaft • Open or short circuit in the wiring harnesses Is there any malfunction detected?	Yes	Repair or replace the malfunctioning part according inspection results.
No	Go to the next step.
27	Access and monitor the following PIDs using the data monitor function. • ECT • APP • MAF • O2S11 • O2S12 • LONGFT1 • SHTFT1 Do the PIDs indicate the correct values under the malfunction condition? (See PCM INSPECTION [L3 Turbo].)	Yes	Go to the next step.
No	Inspect and repair or replace suspected parts and related harnesses. If the malfunction remains, perform the intermittent concern troubleshooting procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING [L3 Turbo].)
28	Remove and shake the PCV valve. Does the PCV valve rattle?	Yes	Go to the next step.
No	Replace the PCV valve.
29	Inspect for restriction in the exhaust system and Three-way catalytic converter (TWC). Is there any restriction?	Yes	Replace malfunctioning part.
No	Go to the next step.
30	Perform the spark test. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].) Is a strong blue spark visible at each cylinder?	Yes	Go to the next step.
No	Inspect or replace the malfunctioning parts, according to the inspection results.
31	Access and monitor the FUEL_PRES PID. Is the FUEL_PRES PID value within the specification? (See PCM INSPECTION [L3 Turbo].)	Yes	Go to Step 35.
No	Go to the next step.
32	Is the vehicle accelerate performance normally?	Yes	Go to the next step.
No	Go to Step 34.
33	Inspect the fuel pressure sensor. (See FUEL PRESSURE SENSOR INSPECTION [L3 Turbo].) Is the fuel pressure sensor normal?	Yes	Go to Step 35.
No	Replace the delivery pipe.
34	Replace the high pressure fuel pump. Monitor FUEL_PRES PID. Is the FUEL_PRES PID value within the specified? (See PCM INSPECTION [L3 Turbo].)	Yes	Troubleshooting is completed. Go to Step 38.
No	Inspect the fuel pressure sensor. (See FUEL PRESSURE SENSOR INSPECTION [L3 Turbo].)
35	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 [L3 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.
36	Inspect the fuel injector for each cylinder. (See FUEL INJECTOR INSPECTION [L3 Turbo].) Are the fuel injectors normal?	Yes	Go to the next step.
No	Replace the suspected fuel injector. (See FUEL INJECTOR REMOVAL/INSTALLATION [L3 Turbo].)
37	Measure the compression pressure for each cylinder. (See COMPRESSION INSPECTION [L3 Turbo].) Are the compression pressures within the specification?	Yes	Replace the injector driver module. If the problem remains, overhaul the engine.
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 Service if necessary.
38	Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. • If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair 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

Connect the M-MDS to the DLC-2.

Do any of the following conditions appear?

• Engine does not start completely.

• DTC B1681 is displayed.

Yes

Both conditions are appear:

Go to Step 5.

Either or other condition appears:

Go to the next step.

Does the engine stall after approx. 2s from when it is started?

Yes

Go to the next step.

Is the immobilizer system is normal?

Go to Step 16.

Is the coil connector securely connected to coil?

Yes

Go to the next step.

Connect the connector securely, retest from Step 2.

Does the security light illuminate?

Yes

Go to the next step.

Inspect and repair or replace the following:

• Wiring harnesses and connectors from PCM terminal 1AI and instrument cluster terminal 1K

• Wiring harnesses and connectors from PCM terminal 1AM and instrument cluster terminal 1I

(See INSTRUMENT CLUSTER INSPECTION.)

Retrieve the DTC using the M-MDS.

Are any of the following DTCs present?

DTC B1213, B1342, B1600, B1601, B1602, B1681, B2103, B2431

Yes

Go to appropriate DTC test.

(See DTC TABLE [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)])

Advanced keyless entry system is not equipped:

Go to the next step.

Advanced keyless entry system is equipped:

Go to Step 11.

Is there continuity between PCM terminal 1BB, 1BH, 1BD, 1BG, 1AZ and ground?

Yes

Go to the next step.

Repair or replace the wiring harness.

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

Measure the voltage between PCM terminal1BB, 1BH, 1BD, 1BG, 1AZ and ground.

Is the voltage below 1.0V?

Yes

Go to the next step.

Repair or replace the wiring harness.

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

Access the VPWR PID.

Is the VPWR PID normal?

VPWR PID

Battery voltage

Yes

Go to the next step.

Repair or replace the wiring harness.

Disconnect the coil connector.

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

Is there battery voltage at coil connector terminal D?

Yes

Go to the next step.

Repair or replace the wiring harness between coil connector terminal D and the fuse panel.

Inspect the following wiring harness and connectors.

• Between coil terminal A and keyless CM terminal 3V

• Between coil terminal B and keyless CM terminal 3U

Is there any malfunction (open or short circuit, terminal corrosion, etc.)?

Yes

Repair or replace malfunction part.

Go to the next step.

Is there continuity between the keyless CM harness-side connector terminal 2B and body ground?

Yes

Go to the next step.

Repair or replace the wiring harness.

Turn the ignition switch to the ON position.

Measure the voltage between keyless CM harness-side connector terminal 2B and body ground.

Is the voltage below 1.0V?

Yes

Go to the next step.

Repair or replace the wiring harness.

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

Measure the voltage between keyless CM harness-side connector terminal 2A, 2C, 2E and body ground.

Is the voltage B+?

Yes

Go to the next step.

Repair or replace the wiring harness.

Turn the ignition switch off.

Disconnect the coil connector.

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

Measure the voltage between coil harness-side connector terminal D and body ground.

Is the voltage B+?

Yes

Go to the next step.

Repair or replace the wiring harness.

Inspect the following wiring harnesses and connectors.

• Between keyless CM terminal 3V and coil A

• Between keyless CM terminal 3U and coil B

• Between keyless CM terminal 3X and PCM 1AM

• Between keyless CM terminal 3W and PCM 1AI

Is there any malfunction (open or short circuit, terminal corrosion, etc.)?

Yes

Repair or replace malfunctioning part.

Go to the next step.

Inspect for the following:

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

• Intake-air system leakage and restriction

• Electrical connectors

• Poor connection for PCM ground and body ground

• Fuel leakage

• Vacuum leakage

Are all items normal?

Yes

Go to the next step.

Service if necessary.

Repeat Step 16.

Perform the self-test function using M-MDS.

Turn the ignition switch to the ON position.

Retrieve any DTCs.

Is the DTC displayed?

Yes

DTC is displayed:

Go to the appropriate DTC test.

(See DTC TABLE [L3 Turbo].)

No DTC is displayed:

Go to the next step.

Access the ECT PID using the M-MDS.

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

Is the ECT PID less than specified?

Yes

Go to the next step.

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

Perform the symptom troubleshooting "NO.17 COOLING SYSTEM CONCERNS - OVERHEATING."

(See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [L3 Turbo].)

Access the VPWR PID.

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

Does the VPWR PID indicate B+?

Yes

Go to the next step.

Repair or replace the wiring harness between main relay terminal C and PCM terminal 2Y and 1D.

Perform the A/C Cut-off Operation Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].)

Does the A/C Cut-off Operation work properly?

Yes

Go to the next step.

Repair or replace malfunctioning parts according to the inspection results.

Will the engine run smoothly at part throttle?

Yes

Go to the next step.

Go to Step 23.

Perform the TP sweep inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].)

Does the electronic throttle control system work properly?

Yes

Visually inspect the throttle body (damaged/scratching.)

If normal, go to the next step.

Inspect or replace the malfunctioning parts, according to the inspection results.

Perform the EGR system operation inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].)

Does EGR system operate properly?

Yes

Go to the next step.

Inspect or replace the malfunctioning parts, according to the inspection results.

Perform the Purge Control System Operation inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].)

Does the purge solenoid valve work properly?

Yes

Go to the next step.

Inspect or replace the malfunctioning parts, according to the inspection results.

Perform the Variable Valve Timing Control System Operation Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].)

Does the variable valve timing control system work properly?

Yes

Inspect the valve timing.

Inspect or replace the malfunctioning parts, according to the inspection results.

Inspect the CMP and CKP sensor for the following;

• Installation condition

(See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [L3 Turbo].)

(See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [L3 Turbo].)

• Damaged trigger wheel and camshaft

• Open or short circuit in the wiring harnesses

Is there any malfunction detected?

Yes

Repair or replace the malfunctioning part according inspection results.

Go to the next step.

Access and monitor the following PIDs using the data monitor function.

• ECT

• APP

• MAF

• O2S11

• O2S12

• LONGFT1

• SHTFT1

Do the PIDs indicate the correct values under the malfunction condition?

(See PCM INSPECTION [L3 Turbo].)

Yes

Go to the next step.

Inspect and repair or replace suspected parts and related harnesses.

If the malfunction remains, perform the intermittent concern troubleshooting procedure.

(See INTERMITTENT CONCERN TROUBLESHOOTING [L3 Turbo].)

Remove and shake the PCV valve. Does the PCV valve rattle?

Yes

Go to the next step.

Replace the PCV valve.

Inspect for restriction in the exhaust system and Three-way catalytic converter (TWC).

Is there any restriction?

Yes

Replace malfunctioning part.

Go to the next step.

Perform the spark test.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].)

Is a strong blue spark visible at each cylinder?

Yes

Go to the next step.

Inspect or replace the malfunctioning parts, according to the inspection results.

Access and monitor the FUEL_PRES PID. Is the FUEL_PRES PID value within the specification?

(See PCM INSPECTION [L3 Turbo].)

Yes

Go to Step 35.

Go to the next step.

Is the vehicle accelerate performance normally?

Yes

Go to the next step.

Go to Step 34.

Inspect the fuel pressure sensor.

(See FUEL PRESSURE SENSOR INSPECTION [L3 Turbo].)

Is the fuel pressure sensor normal?

Yes

Go to Step 35.

Replace the delivery pipe.

Replace the high pressure fuel pump.

Monitor FUEL_PRES PID.

Is the FUEL_PRES PID value within the specified?

(See PCM INSPECTION [L3 Turbo].)

Yes

Troubleshooting is completed.

Go to Step 38.

Inspect the fuel pressure sensor.

(See FUEL PRESSURE SENSOR INSPECTION [L3 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 [L3 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.

Inspect the fuel injector for each cylinder.

(See FUEL INJECTOR INSPECTION [L3 Turbo].)

Are the fuel injectors normal?

Yes

Go to the next step.

Replace the suspected fuel injector.

(See FUEL INJECTOR REMOVAL/INSTALLATION [L3 Turbo].)

Measure the compression pressure for each cylinder.

(See COMPRESSION INSPECTION [L3 Turbo].)

Are the compression pressures within the specification?

Yes

Replace the injector driver module.

If the problem remains, overhaul the engine.

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

Service if necessary.

Verify test results.

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

• If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair 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.