Antilock Brake Module (ABS)

U0126-LOST COMMUNICATION WITH STEERING ANGLE SENSOR







- When Monitored:

- With the ignition on
- Battery voltage between 10 and 16 volts
- Ignition Off Draw (IOD) fuse installed
- Set Condition:
If the Anti-Lock Brake Module fails to receive bus messages from the Steering Angle Sensor for approximately 100 ms.





1. VERIFY DTC IS ACTIVE

NOTE: Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

1. Turn the ignition on.
2. With the scan tool, read and record ABS DTCs.
3. With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.
4. With the scan tool, erase ABS DTCs.
5. Cycle the ignition switch.
6. With the scan tool, read ABS DTCs.

Does this DTC reset?

Yes

- Go To 2

No

- The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.
- Perform the ABS INTERMITTENT CONDITION TEST. ABS Intermittent Condition Test.

2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCs
1. With the scan tool, read all active DTCs from all CAN C Bus modules.

NOTE: Check for CAN C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.

Does the scan tool display any active DTCs related to the conditions listed above?

Yes

- Diagnose and repair the DTC(s).

No

- Go To 3

3. CHECK THE VOLTAGE ON THE (F943) FUSED IGNITION SWITCH OUTPUT CIRCUIT




1. Turn the ignition off.
2. Disconnect the Clockspring C3 (SAS) harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (F943) Fused Ignition Switch Output circuit.

Is the voltage above 10 volts?

Yes

- Go To 4

No

- Repair the (F943) Fused Ignition Switch Output circuit for an open.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

4. CHECK THE RESISTANCE OF THE (Z926) GROUND CIRCUIT




1. Turn the ignition off.
2. Measure the resistance between the (Z926) Ground circuit and ground.

Is the resistance below 5.0 Ohms?

Yes

- Go To 5

No

- Repair the (Z926) Ground circuit for an open.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

5. VERIFY THAT THE STEERING ANGLE SENSOR IS ACTIVE ON THE BUS
1. With the scan tool, select ECU View.
2. Verify that the Steering Angle Sensor is active on the bus.

Is the Steering Angle Sensor active on the bus?

Yes

- Replace the Clockspring (SAS).
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Perform the Stored Lost Communication DTC diagnostic procedure. Stored Lost Communication DTCs