DTC Troubleshooting

DTC DIAGNOSTIC TROUBLESHOOTING CHART

Step	Action	YES	NO
1	Was "Engine and Emission Control System Check" performed?	Go to Step 2.	Go to ENGINE AND EMISSION CONTROL SYSTEM CHECK .
2	Is engine cranked?	Go to Step 3.	Go to CRANKING SYSTEM SYMPTOM DIAGNOSIS .
3	Is there DTC P0616 and/or P0617 (starter relay circuit)?	Go to DTC P0616: Starter Relay Circuit Low and/or DTC P0617: Starter Relay Circuit High .	Go to Step 4.
4	CMP sensor power supply voltage check With ignition switch turned OFF, disconnect CMP sensor coupler (1). With ignition switch turned ON, measure voltage between "BLU/BLK" wire terminal (2) and "GRY/YEL" wire terminal (3). Is the voltage 10 - 14 V?	Go to Step 5.	Faulty "BLU/BLK" wire and/or "GRY/YEL" wire.
5	CMP sensor (REF) signal check With ignition switch turned OFF, connect CMP sensor coupler. Disconnect couplers from ignition coil assembly and fuel injectors. Remove ECM cover. With ignition switch turned ON and crankshaft turned slowly, check voltage between "C51- 1-13" and "C51-3-26" terminal. Does voltmeter indicator deflect between 0 - 1 V and 3 - 5.25 V 4 times while crankshaft turned two revolutions?	Go to Step 6.	Faulty "YEL/BLU" wire or CMP sensor. If OK, substitute a known-good ECM and recheck.
6	CMP sensor (POS) signal check With ignition switch ON and crankshaft turned slowly, check voltage between "C51-1-12" and "C51-3-26" terminal. Does voltmeter indicator deflect between 0 - 1 V and 3 - 5.25 V 6 times while crankshaft turned two revolutions?	Poor "C51-1-12" and/or "C51-3-13" terminal of ECM coupler connection. If OK, substitute a known-good ECM and recheck.	Faulty "YEL/GRN" wire or CMP sensor. If OK, substitute a known-good ECM and recheck.