C1043 Left Rear Tone Wheel Performance
November 03, 2017
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C1043 Left Rear Tone Wheel Performance - When the Antilock Brake System (ABS) Module detects periodic drops of a wheel speed sensor (WSS) signal.
Possible causes C1043 code
- Dirty tone wheel/sensor.
- Improper right front tire pressure/mismatched tires.
- Axle shaft fastener hardware.
- Left rear tone wheel/bearing damage.
Diagnose DTC C1043 Left Rear Tone Wheel Performance
Step 1. Check for a DTC
This DTC must be active for the result of this test to be valid. Turn the igntion on, with the scan tool, read DTC. Record and freeze frame information. With the scan tool, erase DTC. Cycle the ignition switch off then on.
Caution: Make sure braking capability is available before road testing.
Test drive the vehicle in a straight line to 40 km/h (25mph).
Vehicle must be driven above 40 Km/h (25 mph) for set conditions to be met. With the scan tool, read DTC.
Does the scan tool display C1043 LEFT REAR TONE WHEEL PERFORMANCE?
YES, go to step 3.
NO, go to step 2.
Step 2. Check 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 staright as possible from a stop to 40 km/h (25 mph).
Is the Left rear WSS speed showing 0 km/h (0 mph) or not matching other wheels or showing erratic behavior?
YES, go to step 3
NO, Perform the ABS Verification Test.
Step 3. Check for improper left rear tire pressure/mismatched tires
Turn the ignition off, check and adjust the left rear tire pressure. Check and adjust all other tire pressures, inspect for mismatched tires on vehicle.
Is the left rear improperly inflated or mismatched tires on vehicle?
YES, repair as necessary.
NO, go to step 4.
Step 4. Check 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 step 5.
Step 5. Check the left rear tone wheel/bearing for damage
Check the tone wheel teeth for missing teeth, cracks, or looseness. Teeth should be perfectly square, not bent, or nicked.
Check the left rear tone wheel/bearing for damage, check the left rear tone wheel for dirt.
Was the tone wheel dirty?
YES, clean tone wheel and sensor. Clear codes and retest.
NO, replace the Left rear tone wheel/bearing.
NO, Perform the ABS Verification Test.
Step 3. Check for improper left rear tire pressure/mismatched tires
Turn the ignition off, check and adjust the left rear tire pressure. Check and adjust all other tire pressures, inspect for mismatched tires on vehicle.
Is the left rear improperly inflated or mismatched tires on vehicle?
YES, repair as necessary.
NO, go to step 4.
Step 4. Check 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 step 5.
Step 5. Check the left rear tone wheel/bearing for damage
Check the tone wheel teeth for missing teeth, cracks, or looseness. Teeth should be perfectly square, not bent, or nicked.
Check the left rear tone wheel/bearing for damage, check the left rear tone wheel for dirt.
Was the tone wheel dirty?
YES, clean tone wheel and sensor. Clear codes and retest.
NO, replace the Left rear tone wheel/bearing.
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