C101C

C101C - Right Front Wheel Speed Sensor Signal Erratic Performance

For a complete wiring diagram, refer to.

• When Monitored: With the ignition ON.

• Set Condition: When the right front wheel speed sensor signal is intermittently missing while vehicle speed is more than 40 km/h (25 m.p.h.) or erratic wheel speed signal during acceleration or sensed wheel speed is different from other wheels.






Test Step 1 - Test for DTC C101C - Right Front Wheel Speed Sensor Signal Erratic Performance

• This DTC must be active for the results of this test to be valid.

• If DTC C1015 - Right Front Wheel Speed Sensor Circuit is present it must be repaired before continuing.

• Turn the ignition ON.

• With the scan tool, record and erase DTCs.


Ensure brake capability is available before road testing.

• Road test the vehicle over 40 km/h (25 m.p.h.).

• Vehicle must be driven more than 40 km/h (25 m.p.h.) for set conditions to be met.

• With the scan tool, read DTCs.

Does the scan tool display C101C - Right Front Wheel Speed Sensor Signal Erratic Performance active?

Yes

• Go to Test Step 3 => [ Test Step 3 - Test for Improper Right Front Tire Pressure/Mismatched
Tires ]

No

• Go to Test Step 2 => [ Test Step 2 - Test Wheel Speed Sensor Signals ]

Test Step 2 - Test Wheel Speed Sensor Signals

• Turn the ignition ON.

• With the scan tool, monitor and graph ALL the WSS speeds and compare graph while an assistant drives the vehicle.

• If graph shows periodic dropouts pay close attention to the tone wheel.

• Slowly accelerate as straight as possible from a stop to 40 km/h (25 m.p.h.).

Is the right front WSS speed showing 0 km/h (0 m.p.h.) or not matching other wheels or showing erratic behavior?

Yes

• Go to Test Step 3 => [ Test Step 3 - Test for Improper Right Front Tire Pressure/Mismatched
Tires ]

No

• Perform ABS Verification Test. Refer to => Non-DTC
Based Diagnostics. ABS Verification Test

Test Step 3 - Test for Improper Right Front Tire Pressure/Mismatched Tires

• Turn the ignition OFF.

• Test and adjust the right front tire pressure.

• Test and adjust all other tire pressures.

• Inspect for mismatched tires on vehicle.

Is the right front tire improperly inflated or mismatched tires on vehicle?

Yes

• Repair as necessary.

• Perform ABS Verification Test. Refer to => Non-DTC
Based Diagnostics. ABS Verification Test

No

• Go to Test Step 4 => [ Test Step 4 - Test Right Front WSS Looseness, Inspect Circuits/Terminals
for Damage ]

Test Step 4 - Test Right Front WSS Looseness, Inspect Circuits/Terminals for Damage

• Test all terminals for broken, bent, pushed out, or corroded terminals.

• Inspect the anti lock brake module harness connector, right front WSS, and right front WSS harness connector.

• Inspect the right front WSS for looseness, excessive corrosion and not properly fastened.

• Inspect the right front WSS signal and right front WSS supply circuits between the right front WSS and anti lock brake module for damage.

Is the right front WSS loose or any of the wiring/connectors/terminals damaged?

Yes

• Repair as necessary.

• Perform ABS Verification Test. Refer to => Non-DTC
Based Diagnostics. ABS Verification Test

No

• Go to Test Step 5 => [ Test Step 5 - Test Right Front Wheel Speed Sensor for Damage ]

Test Step 5 - Test Right Front Wheel Speed Sensor for Damage

• Remove the right front wheel speed sensor.

• Inspect the right front wheel speed sensor face for damage

Is the Right Front Wheel Speed Sensor damaged?

Yes

• Replace sensor and hub assembly.

• Perform ABS Verification Test. Refer to => Non-DTC
Based Diagnostics. ABS Verification Test

No

• Go to Test Step 6 => [ Test Step 6 - Test Right Front Tone Wheel/Bearing for Damage ]

Test Step 6 - Test Right Front Tone Wheel/Bearing for Damage

• Inspect the right front tone wheel/bearing for damage, missing teeth, cracks, corrosion or looseness.

• The tone wheel teeth should be perfectly square, not bent, or nicked.

Is the right front tone wheel/bearing damaged?

Yes

• Repair as necessary.

• Perform ABS Verification Test. Refer to => Non-DTC
Based Diagnostics. ABS Verification Test

No

• Go to Test Step 7 => [ Test Step 7 - Test Right Front Wheel Bearing for Damage ]

Test Step 7 - Test Right Front Wheel Bearing for Damage

• Inspect the right front wheel bearing for excessive runout or clearance.

• Refer to the appropriate service information, if necessary, for procedures or specifications.

Is the Right Front Wheel Bearing Damaged?

Yes

• Repair as necessary.

• Perform ABS Verification Test. Refer to => Non-DTC
Based Diagnostics. ABS Verification Test

No

• Go to Test Step 8 => [ Test Step 8 - Right Front Wheel Speed Sensor ]

Test Step 8 - Right Front Wheel Speed Sensor

• Replace the right front wheel speed sensor.

• Perform ABS Verification Test. Refer to => Non-DTC
Based Diagnostics. ABS Verification Test

• Road test the vehicle over 40 km/h (25 m.p.h.).

• Vehicle must be driven more than 40 km/h (25 m.p.h.) for set conditions to be met.

• With the scan tool, read ABS DTCs.

Did DTC C101C - Right Front Wheel Speed Sensor Signal Erratic Performance reset?

Yes

• Replace the anti lock brakes module.

• Perform ABS Verification Test. Refer to => Non-DTC
Based Diagnostics. ABS Verification Test

No

• Test Complete.