Central Control Module (CCM)

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

CKTs 1294, 1295, and the Variable Effort Steering (VES) solenoid actuator are used to conduct the pulse width modulation for the variable effort system. The CCM has the ability to detect a problem in the VES circuits.

DTC WILL SET WHEN

With ignition in "RUN," the YES function is "OFF," CKT 1295 is not grounded by the CCM, and voltage at terminal "C13" is less than 2 volts (102 A/D counts). The CCM checks for a fault once each ignition cycle, and will set a DTC if the fault exists.

ACTION TAKEN

DTC 26 will set. If CKTs 1294, 1295, or VES solenoid actuator is shorted to ground or open, the CCM checks for a fault once each ignition cycle, and will set a DTC if the fault exists.

DTC CHART TEST DESCRIPTION

Number(s) below refer to circled number(s) on the diagnostic chart.

1. This test checks resistance of the YES circuit.

2. This test checks for a potential ground in CKTs 1294, 1295 or the Power Steering (P/S) pump and Electronic Variable Orifice (EVO) actuator.

3. This test isolates if ground is in the circuits or the P/S pump and EVO actuator.

4. This test determines if open is in the P/S pump and EVO actuator or the circuits.

5. This test isolates shorted circuits or shorted P/S pump and EVO actuator are setting the DTC.

DIAGNOSTIC AIDS

If the DTC is a history DTC, the problem may be intermittent. Try performing the test shown while "wiggling" wiring and connectors; this can often cause the fault to appear. Check for poor connections at both the CCM and the variable effort steering solenoid actuator connector; these could cause an open or an intermittent fault. Refer to "Intermittents/History DTCs". Intermittents/History DTCs A Tech 1 can be used to monitor the CCM VES output.