For 1990-2009 cars

### Circuit Description

The wheel speed sensor produces an AC voltage whose amplitude and frequency vary, depending on the velocity of the wheel. The electronic brake and traction control module (EBTCM) uses this voltage signal to calculate wheel speed.

### DTC Parameters

DTC C0045 will set if the following conditions exist:

• | Left rear wheel speed circuit is open, grounded, or shorted to battery.

• | Left rear wheel speed = zero, while other wheel speeds are greater than 40 km/h (25 mph) for 10 ms.

• | This code can set anytime after the key is turned to the RUN position.

When the DTC sets, the EBTCM will disable ABS and Traction Control and turn ON the antilock telltale.

If 2 or more wheel speed faults occur, dynamic rear proportioning (DRP) is disabled for the entire ignition cycle.

### Diagnostic Aids

Inspect wiring, components, and connectors for the following:

• | Proper connection

• | Backed-out terminals

• | Broken connector locks

• | Corrosion in connectors/terminals

• | Burned, chafed or pinched wiring

• | Broken wire inside insulation

• | Loose components

Possible causes for DTC C0045 to set:

• | Damaged or missing teeth on the wheel speed sensor ring.

• | Large grooves or gouges, or build-up of foreign material in the gaps between the wheel speed sensor ring teeth.

• | A worn rear hub bearing assembly, or worn inner axle bearing which could allow the sensor to toothed ring gap to change excessively.

### DTC C0045