Diagnostic procedure

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DIAGNOSTIC PROCEDURE

STEP	INSPECTION	RESULTS	ACTION
1	Does the engine idle rough?	Yes	Go to symptom troubleshooting "NO. 8 ENGINE RUNS ROUGH/ROLLING IDLE". (See NO. 8 ENGINE RUNS ROUGH/ROLLING IDLE ).
1	Does the engine idle rough?	No	Go to the next step.
2	Verify the following: Fuel quality (proper octane, contamination, winter/summer blend) Intake-air system restriction or leakage Fuel leakage in fuel system Vacuum leakage Are all items normal?	Yes	Go to the next step.
2		No	Service if necessary. Repeat Step 2.
3	Inspect CMP and CKP sensor for the following; Installation condition (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION ). (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION ). 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.
3		No	Go to the next step.
4	Perform the self-test function using the WDS or equivalent. Turn the ignition switch to the ON position. Retrieve any DTCs. Is a DTC displayed?	Yes	DTC is displayed: Go to the appropriate DTC test. (See DTC TABLE ).
4		No	No DTC is displayed: Go to the next step.
5	Connect the WDS or equivalent to the DLC-2. Access and monitor the following PIDs using the data monitor function. ACSW APP BOO ECT MAF TP O2S11 O2S12 LONGFT1 SHTFT1 PSP (PCM terminal 1Z) CPP (PCM terminal 1H) PNP (PCM terminal 1W) Do the PIDs indicate the correct values under trouble condition? (See USING THE WDS OR EQUIVALENT ).	Yes	Go to the next step.
5		No	Inspect and repair or replace suspected parts and the related harnesses. If the malfunction remains, perform the intermittent concern troubleshooting procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING ).
6	Perform the EGR system operation inspection. (See EGR CONTROL SYSTEM INSPECTION ). Does the EGR system operate properly?	Yes	Go to the next step.
6		No	Inspect or replace the malfunctioning parts, according to the inspection results.
7	Perform the TP sweep inspection. (See THROTTLE POSITION (TP) SWEEP INSPECTION ). Does the electronic throttle control system work properly?	Yes	Visually inspect the throttle body (damaged/scratching). If normal, go to the next step.
7		No	Inspector replace the malfunctioning parts, according to the inspection results.
8	Perform the Purge Control System Operation inspection. (See PURGE CONTROL SYSTEM INSPECTION ). Does the purge solenoid valve work properly?	Yes	Go to the next step.
8		No	Inspect or replace the malfunctioning parts, according to the inspection results.
9	Perform the A/C Cut-off Operation Inspection. (See A/C CUT-OFF CONTROL SYSTEM INSPECTION ). Does the A/C Cut-off Operation work properly?	Yes	Go to the next step.
9		No	Repair or replace the malfunctioning parts according to inspection results.
10	Access and monitor the FUEL_PRES PID. Is the FUEL_PRES PID value within the specification? (See USING THE WDS OR EQUIVALENT ).	Yes	Go to Step 14.
10		No	Go to the next step.
11	Is the vehicle accelerate performance normally?	Yes	Go to the next step.
11	Is the vehicle accelerate performance normally?	No	Go to Step 14.
12	Inspect the fuel pressure sensor. (See FUEL PRESSURE SENSOR INSPECTION ). Is the fuel pressure sensor normal?	Yes	Go to Step 14.
12		No	Replace the delivery pipe.
13	Replace the high pressure fuel pump Monitor FUEL_PRES PID. Is the FUEL_PRES PID value within the specified? (See USING THE WDS OR EQUIVALENT ).	Yes	Troubleshooting is completed. Go to the Step 17.
13		No	Go to the next step.
14	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 ). Is the fuel pressure within the specification?	Yes	Go to the next step.
14		No	Inspect for the following: Fuel line restriction Fuel filter clogging If normal replace the fuel pump.
15	Inspect the fuel injector for each cylinder. (See FUEL INJECTOR INSPECTION ). Are fuel injectors normal?	Yes	Go to the next step.
15		No	Replace the suspected fuel injector. (See FUEL INJECTOR REMOVAL/INSTALLATION ).
16	Measure the compression pressure for each cylinder. (See COMPRESSION INSPECTION ). Are compression pressures within the specification?	Yes	Replace the injector driver module. If the problem remains, overhaul the engine.
16		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.
17	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.