Advanced Diagnostics

DTC P1673 (22): Motor Control Module (MCM) Relay Stays Activated




General Description
The motor control module (MCM) relay turns on when the ignition switch is turned on or when the MCM directs it to turn on. (Even when the ignition switch is turned off during driving, MCM relay 1 remains powered when the MCM directs it to turn on.) When MCM relay 1 is stuck on, the MCM remains powered even when the ignition switch is turned off, and even though the MCM tries to turn off the relay, the result may be a dead battery.




Monitor Execution, Sequence, Duration, DTC Type, OBD Status




Enable Conditions

Malfunction Threshold
The MCM power is not turned off for at least 5 seconds after MCM relay 1 is directed to turn off.

Driving Pattern
1. Turn the ignition switch ON.
2. Turn the ignition switch OFF, and wait for at least 30 seconds.
3. Turn the ignition switch ON.

Diagnosis Details

Conditions for illuminating the IMA system indicator
When a malfunction is detected, the I MA system indicator comes on and the DTC and the freeze frame data are stored in the MCM memory.

Conditions for clearing the IMA system indicator
The IMA system indicator will be cleared if the malfunction does not recur during the next trip in which the diagnostic runs.

The IMA system indicator, the DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by disconnecting the battery.