C102A

C102A-LEFT REAR WHEEL SPEED COMPARATIVE PERFORMANCE






When Monitored:

With the ignition on

Set Condition:

When the Left Rear Wheel Speed Sensor circuit fails the diagnostic test.

Diagnostic Test

1. CHECK FOR A DTC C1O2A LEFT REAR WHEEL SPEED COMPARATIVE PERFORMANCE

NOTE: This DTC must be active for the results of this test to be valid

Turn the ignition on.

With the scan tool read and record DTC's.

With the scan tool, read and record Freeze Fame information.

With the scan tool, erase DTC's.

Cycle the ignition switch from off to on.

CAUTION: Ensure brake capability is available before road testing

Have an assistant test drive the vehicle in a straight line to 40 Km/h (25 mph) while monitoring all the WSS speeds with the scan tool.

Did the LR WSS speed differ by 8 Km/h (5 mph) or show NO speed?

Yes

- Go To 2

No

- Refer to the INTERMITTENT CONDITION diagnostic procedure. Testing and Inspection.
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test.

2. CHECK THE TERMINALS/CONNECTORS/TONE WHEEL FOR DAMAGE





NOTE: Check all related wiring for bruised chafed pierced, or partially broken wires

NOTE: Check all related connectors for broken, bent, pushed out, or corroded terminals

NOTE: Check the tone wheel teeth for missing teeth, cracks, or looseness Teeth should be perfectly square, not bent, or nicked

Turn the ignition off

Visually inspect the Anti-Lock Brake Module harness connector Left REAR WSS Left REAR WSS harness connector and Left REAR WSS tone wheel (if applicable) for damage

Were any problems found?

Yes

- Repair as necessary
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test

No

- Go To 3

3. CHECK THE VOLTAGE BETWEEN (B4) LEFT REAR WSS SUPPLY CIRCUIT AND THE (B3) LEFT REAR WSS SIGNAL CIRCUIT

Turn the ignition off

Disconnect the Left Front WSS harness connector

Turn the ignition on

Measure the voltage between the (B4) Left REAR WSS Supply and (B3) Left REAR WSS Signal circuits at the Left Front WSS harness connector

Is the voltage above 10 volts?

Yes

- Go To 4

No

- Refer to DTC-C1O20 LEFT REAR WHEEL SPEED SENSOR CIRCUIT for the diagnostic repair procedure
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test

4. CHECK THE (B3) LEFT REAR WSS SIGNAL VOLTAGE AT THE LEFT REAR WSS HARNESS CONNECTOR





Turn the ignition off.

Reconnect all connectors.

Turn the ignition on.

While back probing measure between the (B3) Left REAR WSS Signal circuit and chassis ground at the Left REAR WSS harness connector.

Slowly rotate the wheel by hand.

Did the (B3) Left REAR WSS Signal circuit voltage toggle between approximately 1.6 to 8 volts?

Yes

- Go To 5

No

- Replace the Left REAR WSS
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.

5. CHECK THE (B3) LEFT REAR WSS SIGNAL VOLTAGE AT THE ANTILOCK BRAKE MODULE HARNESS CONNECTOR





Turn the ignition off Turn the ignition on

While back probing measure between the (B3) Left REAR WSS Signal circuit and chassis ground at the AntiLock Brake Module harness connector

Slowly rotate the wheel by hand

Did the (B3) Left REAR WSS Signal circuit voltage toggle between approximately 1.6 to 8 volts?

Yes

- Replace the Anti-Lock Brake Module
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test

No

- Repair the (B3) Left REAR WSS Signal circuit for an open
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test