Pinpoint Test Ab: Injector Drive Circuit Operation: Detection/Management

NOTE: Special instructions are required to clear IDM DTCs on 1995-96 models.

Turn ignition on.
Record IDM DTCs stored in KOEO SELF-TEST and KOEO INJECTOR ELECTRICAL SELF-TEST (BUZZ TEST) modes.
Access RETRIEVE/CLEAR CONTINUOUS DTCs from NGS Tester menu to clear IDM DTCs from memory.
Record any DTCs displayed. (1111 may be the only DTC displayed.)
Push CLEAR ALL button on NGS Tester.

IDM DTCs are now cleared from memory. Repeat KOEO SELF TEST and KOEO INJECTOR ELECTRICAL SELF-TEST (BUZZ TEST) . Any IDM DTCs that reappear are IDM hard faults. If no IDM DTCs reappear, then fault is an intermittent IDM fault. IDM is capable of detecting individual injector open and shorts to either ground or battery while engine is running. It is also capable of detecting right or left bank high side opens or shorts to ground. A special on-demand buzz electrical self test will also allow operator to enable all injector solenoids while engine is off to verify circuit operation. IDM detected DTCs will not be transmitted if EF line is not functioning; however, engine will not shut down due to a non-functional EF line. If a low side short to ground condition is determined by IDM, this condition will be transmitted to PCM via EF signal. PCM will enable CHECK ENGINE light and command minimum fuel to affected bank.