Advanced Diagnostics

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 to ON (II) or when the MCM directs it to turn on. (Even when the ignition switch is turned to LOCK (0) 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 to LOCK (0), 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 to ON (II).
2. Turn the ignition switch to LOCK (0), and wait for at least 30 seconds.
3. Turn the ignition switch to ON (II).

Diagnosis Details

Conditions for setting the DTC
When a malfunction is detected, the IMA system indicator comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the MCM memory.

Conditions for clearing the DTC
The IMA system indicator is cleared if the malfunction does not return in the next trip in which the diagnostic runs. The IMA system indicator, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.