Cylinder No. 15 Injector
Cause:
When the ignition switch is turned to ON, the voltage from the ECM’s MREL terminal is applied to the EFI MAIN relay. This causes the EFI MAIN relay contacts to close, which supplies power to the TCM’s +B terminal. This process identifies the absence of a power source or ground, then performs a continuity test to check the integrity of the wiring, the ignition switch, and other components. The continuity test must be performed with the power disconnected from the circuit while reading the wiring.