Central Control Module (CCM)

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

The steering wheel rotation sensor is a potentiometer that can continuously rotate with one wiper in the potentiometer portion of the sensor. The Variable Effort Steering (VES) steering wheel rotation sensor is monitored for shorts to grounds or opens CKTs 1573 or 1574.

TEST CONDITIONS

DTC 45 can be detected whenever the ignition is "ON."

FAILURE CONDITIONS

This fault will set when the steering wheel rotation input voltage stays at 4.740 volts or more for longer than 0.2 seconds.

ACTION TAKEN

DTC 45 will set. The power steering system will revert to "normal operation."

TEST DESCRIPTION

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

1. This test checks for a defective steering wheel rotation sensor.

2. This tests checks for a short to B+ in CKT 1573 or CKT 1574.

DIAGNOSTIC AIDS

A Tech 1 can be used to monitor the steering wheel rotation sensor input voltage as the wheel is turned or road tested. An open in CKT 1575 can cause a DTC 45 to set, because the steering wheel rotation sense will always be high.