C1043

C1043 - Left Rear Tone Wheel Performance

For a complete wiring diagram, refer to.

• When Monitored: With the ignition ON.

• Set Condition: When the anti lock brake module detects periodic drops of a WSS signal.






Test Step 1 - Test for A DTC C1043-Left Rear Tone Wheel Performance

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

• Turn the ignition ON.

• With the scan tool, read DTCs.

• With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.

• With the scan tool, erase DTCs.

• Cycle the ignition switch OFF then ON.


Ensure brake capability is available before road testing.

• Test drive the vehicle in a straight line to 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 meet.

• With the scan tool, read DTCs.

Does the scan tool display C1043 - Left Rear Tone Wheel Performance?

Yes

• Go to Test Step 3 => [ Test Step 3 - Test for Improper Left Rear 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 left rear 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 Left Rear Tire Pressure/Mismatched
Tires ]

No

• Perform the ABS Intermittent Condition Test. Refer to => Non-DTC Based Diagnostics. ABS Intermittent Condition Test

Test Step 3 - Test for Improper Left Rear Tire Pressure/Mismatched Tires

• Turn the ignition OFF.

• Test and adjust the left rear tire pressure.

• Test and adjust all other tire pressures.

• Inspect for mismatched tires on vehicle.

Is the Left Rear 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 Axle Shaft Fastener Hardware for Looseness ]

Test Step 4 - Test Axle Shaft Fastener Hardware for Looseness

• Inspect the axle shaft fastener for looseness, and not properly fastened. Tighten fastener to proper specification as required.

Was the Axle Shaft fastener loose?

Yes

• Repair as necessary.

No

• Go to Test Step 5 => [ Test Step 5 - Test the Left Rear Tone Wheel for Damage ]

Test Step 5 - Test the Left Rear Tone Wheel for Damage

• Test the tone wheel teeth for missing teeth, cracks, or looseness. Teeth should be perfectly square, not bent, or nicked.

• Test the left rear tone wheel for damage.

• Test the left rear tone wheel for dirt.

Was the tone wheel dirty?

Yes

• Clean tone wheel and sensor. Clear codes and retest.

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

No

• Replace the left rear tone wheel.

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