B0938

Diagnostic Chart:

Schematics:

CIRCUIT DESCRIPTION
The instrument panel cluster (IPC) monitors the engine coolant level via a coolant level sensor. The sensor is a module that will switch to ground or provide an open circuit depending on the coolant level. The sensor provides a ground for low coolant level and an open circuit for normal coolant level. Upon every IGN3 powerup, the coolant level sensor grounds the signal circuit momentarily causing the signal circuit to go low. The coolant level sensor will then open the ground path, causing the signal circuit to go high for a predetermined amount of time regardless of coolant level. The IPC will use this toggling ground signal to perform diagnostics on the sensor. The IPC will start monitoring the coolant level, after it has successfully detected a coolant level sensor present, when it begins to receive an open circuit signal from the coolant sensor.

CONDITIONS FOR RUNNING THE DTC
The ignition is turned from CRANK to RUN.

CONDITIONS FOR SETTING THE DTC
The PC detects the signal circuit is grounded for 10 continuous seconds when the ignition is turned from CRANK to RUN.

ACTION TAKEN WHEN THE DTC SETS
The DIC will display the CHECK COOLANT & SERVICE SENSOR message.

CONDITIONS FOR CLEARING THE DTC
^ The DTC will become history if the IPC does not detect a failure the next time the ignition is turned from CRANK to RUN.
^ The history DTC will clear after 50 fault free ignition cycles.
^ The DTC can be cleared with a scan tool.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. Verifies that the fault is present.