Central Control Module (CCM)

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

CKT 1073 and CKT 1074 connect the ignition lock cylinder to the CCM. Contacts in the ignition lock cylinder mate with those on the pellet (part of the ignition key) and the CCM compares the resistance value of the key pellet to the "valid" resistance programmed into the CCM at vehicle assembly.

DTC WILL SET WHEN

The CCM detects a resistance of 307 ohms or less in the PASS Key(R) II circuits, with ignition 1 "ON" that lasts longer than 2 seconds.

ACTION TAKEN

DTC 42 will set. A fault is detected before the engine has started will cause a PASS Key(R)II lockout.

DTC 42 will set.

A fault detected before the engine has started will cause a PASS Key(R)II lockout.

DTC WILL CLEAR WHEN

DTC 42 will clear if the fault goes away for 2 or more seconds.

DTC CHART TEST DESCRIPTION

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

1. This test uses a Tech 1 to read A/D counts.

2. This test isolates fault to steering column or body wiring harness.

3. This test checks CKT 1073 for a short to ground.

4. This test checks CKT 1074 for a short to ground.

DIAGNOSTIC AIDS

If the DTC is a history DTC, the problem may be intermittent. Try performing the tests shown while "wiggling" wiring and connectors; this can often cause the fault to appear. Refer to "Intermittents/History DTCs". Intermittents/History DTCs

Make sure the key resistor contacts are clean and free of any grease, oil etc. These substances could interfere with the key detection circuit and set a DTC.

If there is a short to ground in CKT 1073, the vehicle will exhibit a no-crank condition. ION 1 must be present for a DTC 42 to set.