P1652

Circuit Description

The PCM contains chips called Output Driver Modules that provide 7 switchable ground outputs for operating solenoids, relays, telltales, and other devices. Each of these ground outputs has an internal fault line that feeds back to the PCM's microprocessor. When the output is OFF, the output driver should receive the 5 volts fed to the solenoid, relay, etc. When the output is ON, it should receive 0 volt since it is grounding the output. If it receives 0 volt when the output is OFF or 5 volts when the output is ON, it sets the fault line low. DTC P1652 is used to monitor the fault line of the Lift/Dive output to the Road Sensing Suspension (RSS) module. The RSS module sends a 5 volt signal to the PCM connector C1 terminal 24. The PCM then grounds this circuit when the vehicle is accelerating rapidly (LIFT) or braking hard (DIVE). The RSS module will then command the suspension to FIRM to increase controllability of the vehicle during these conditions.

Conditions for Running the DTC

^ DTC P1650 not set.
^ Engine running for at least 10 seconds.

Conditions for Setting the DTC

Fault line is low for 2 seconds.

Action Taken When the DTC Sets

^ The Malfunction Indicator Lamp (MIL) will not illuminate.
^ No message will be displayed.

Conditions for Clearing the DTC

^ A History DTC will clear after forty consecutive warm-up cycles with no failures of any non-emission related diagnostic test.
^ A Last Test Failed (current) DTC will clear when the diagnostic runs and does not fail.
^ Use a scan tool to clear DTCs.
^ Interrupting PCM battery voltage may or may not clear DTCs. This practice is not recommended.

Diagnostic Aids

Use the Failure Records data to aid in diagnosing an intermittent fault. Use this data captured when the DTC set to determine if an open or shorted condition caused the DTC to set.