DTC P0685-00: ECM/PCM Power Relay Control Circuit/Open: Contents

DTC No.	Detection Item	DTC Detection Condition	Warning Indicate	Memory	Fail-safe Operation	Note
P068500	ECM/PCM Power Relay Control Circuit/Open	Main relay control circuit open	Check engine light: ON Master warning light: OFF Charging system warning light: OFF Engine oil warning light: OFF Wrench warning indicator light: OFF	DTC stored	Not applicable	Drive cycle: 2 Monitor item: CCM Self test type: CMDTC self test

DTC P068500	Main relay control circuit open
DETECTION CONDITION	The period of time in which the ECM power supply remains on after the ignition is switched off is not within the specified time. Diagnostic support note This is a continuous monitor (CCM). The check engine light illuminates if the ECM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the ECM. PENDING CODE is available if the ECM detects the above malfunction condition during first drive cycle. FREEZE FRAME DATA (Mode 02)/Snapshot data is available. DTC is stored in the ECM memory.
FAIL-SAFE FUNCTION	Not applicable
TROUBLE AREA	Main relay malfunction Short to ground or open circuit in main relay power supply circuit: Short to ground in wiring harness between MAIN 200 A fuse and main relay terminal 3 MAIN 200 A fuse and/or ENG.MAIN 40 A fuse malfunction Open circuit in wiring harness between battery positive terminal and main relay terminal 3 ENGINE2 15 A fuse malfunction Short to ground in wiring harness between the following terminals: Main relay terminal 5-ECM terminal A42-5 Main relay terminal 5-ECM terminal A42-18 ECM connector or terminals malfunction Open circuit in wiring harness between ECM terminal C27-46 and body ground Open circuit in wiring harness between ECM terminal C42-7 and body ground Open circuit in wiring harness between the following terminals: Main relay terminal 5-ECM terminal A42-5 Main relay terminal 5-ECM terminal A42-18 ECM malfunction