C1014
C1014-LEFT FRONT WHEEL SPEED COMPARATIVE PERFORMANCE
For the AntiLock Brake System circuit diagram refer wiring diagram.
When Monitored:
With the ignition on
Set Condition:
When the Left Front Wheel Speed Sensor circuit fails the diagnostic test.
Diagnostic Test
1. CHECK FOR A DTC C1O14 LEFT FRONT 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 LF 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 Front WSS Left Front WSS harness connector and Left Front 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 (B9) LEFT FRONT WSS SUPPLY CIRCUIT AND THE (B8) LEFT FRONT WSS SIGNAL CIRCUIT
Turn the ignition off
Disconnect the Left Front WSS harness connector
Turn the ignition on
Measure the voltage between the (B9) Left Front WSS Supply and (B8) Left Front WSS Signal circuits at the Left Front WSS harness connector
Is the voltage above 10 volts?
Yes
- Go To 4
No
- Refer to DTC-C1OOA LEFT FRONT WHEEL SPEED SEN SOR CIRCUIT for the diagnostic repair procedure
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
4. CHECK THE (B8) LEFT FRONT WSS SIGNAL VOLTAGE AT THE LEFT FRONT WSS HARNESS CONNECTOR
Turn the ignition off.
Reconnect all connectors.
Turn the ignition on.
While back probing measure between the (B8) Left Front WSS Signal circuit and chassis ground at the Left Front WSS harness connector.
Slowly rotate the wheel by hand.
Did the (B8) Left Front WSS Signal circuit voltage toggle between approximately 1.6 to 8 volts?
Yes
- Go To 5
No
- Replace the Left Front WSS
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.
5. CHECK THE (B8) LEFT FRONT WSS SIGNAL VOLTAGE AT THE ANTILOCK BRAKE MODULE HARNESS CONNECTOR
Turn the ignition off Turn the ignition on
While back probing measure between the (B8) Left Front WSS Signal circuit and chassis ground at the AntiLock Brake Module harness connector
Slowly rotate the wheel by hand
Did the (B8) Left Front 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 (B8) Left Front WSS Signal circuit for an open
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test