MIL Does Not Come ON with Ignition Switch in ON Position and Engine Stopped (but Engine Can Be Started): Troubleshooting

NOTE: When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the special tool to ECM and/or the ECM connectors referring to INSPECTION OF ECM AND ITS CIRCUITS .

DIAGNOSTIC INFORMATION AND PROCEDURES REFERENCE CHART

Step	Action	YES	NO
1	MIL power supply check Turn ignition switch to ON position. Do other warning lights come ON?	Go to Step 2.	Go to Step 5.
2	DTC check in ECM Connect scan tool to DLC with ignition switch turned OFF. Turn ON ignition switch and check DTC in ECM. Is there DTC(s) U0073 and/or U0121?	Go to applicable DTC troubleshooting.	Go to Step 3.
3	DTC check in ESP® control module Check DTC in ESP® control module. Is there DTC(s) U0073 and/or U0100?	Go to applicable DTC troubleshooting.	Go to Step 4.
4	DTC check in BCM Check DTC in BCM. Is there DTC U0100?	Go to applicable DTC troubleshooting.	Substitute a known-good combination meter and recheck DTC. Refer to DTC CHECK . If MIL still remains OFF, substitute a known-good ECM and recheck DTC.
5	CAN communication line circuit check Check CAN communication line circuit between control modules for open, short, high resistance and connections according to Step 5 to 10 under TROUBLESHOOTING FOR COMMUNICATION ERROR WITH SCAN TOOL USING CAN . Is circuit in good condition?	Go to Step 6.	Repair or replace.
6	"METER" fuse check Turn ignition switch to OFF position. Check for fuse blown at "METER" fuse in junction block. Is "METER" fuse in good condition?	Go to Step 7.	Replace "METER" fuse and check for short.
7	Combination meter power supply check Remove combination meter. Refer to COMBINATION METER REMOVAL AND INSTALLATION Check for proper connection to combination meter connector at "G241 -31" and "G241-16" terminals. If OK, then turn ignition switch to ON position and measure voltage between combination meter connector at "G241 -31" terminal and vehicle body ground. Is it 10 - 14 V?	Go to Step 8.	"RED/BLK" wire is open circuit.
8	Combination meter circuit check Turn ignition switch to OFF position. Measure resistance between "G241-16" terminal of combination meter connector and vehicle body ground. Is resistance 1 Ω or less?	Substitute a known-good combination meter and recheck DTC. Refer to DTC CHECK . If MIL still remains OFF, substitute a known-good ECM and recheck DTC.	"BLK" wire is open or high resistance circuit.