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Home › Pontiac › 2007 › Grand Prix Base › Repair and Diagnosis › Brakes › Anti-Lock Brake System, Traction Control System & Stability Control System › Diagnostic Information and Procedures › DTC U1651 › Test Description

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step tests the ignition circuit for an open.
  2. 3:  This step checks the ground circuit for an open.
  3. 4:  This step tests the CAN HI circuit for an open.
  4. 5:  This step tests the CAN LO circuit for an open.
  5. 6:  This step checks the steering angle sensor connector for poor connections.
DTC U1651

Step Action Yes No
Schematic Reference: Antilock Brake System Schematics 
Connector End View Reference: Antilock Brake System Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. Turn OFF the ignition.
  2. Disconnect the steering angle sensor harness connector.
  3. Using a DMM, check the ignition circuit for an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 12  Go to Step 3 
3 
  1. Disconnect the electronic brake control module (EBCM) harness connector.
  2. Install the J 39700  Universal Pinout Box with the J 39700-530  Cable Adapter between the EBCM and the EBCM harness connector. See Special Tools .
  3. Disconnect the steering angle sensor.
  4. Using a DMM, check the ground circuit for an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 12  Go to Step 4 
4  Using a DMM, check the CAN HI circuit for an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 12  Go to Step 5 
5  Using a DMM, check the CAN LO circuit for an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 12  Go to Step 6 
6  Inspect for poor connections at the harness connector of the steering angle sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 12  Go to Step 7 
7 Inspect for poor connections at the harness connector of the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 12  Go to Step 8 
8 Perform the steering angle sensor centering procedure. Refer to Steering Angle Sensor Centering .
Did you successfully complete the centering procedure?		 Go to Step 9  Go to Step 10 
9
  1. Use the scan tool in order to clear the DTCs.
  2. Test drive the vehicle. Refer to Diagnostic Test Drive .
Did DTC U1651 reset?		 Go to Step 11  Go to Step 12 
10 Replace the steering angle sensor. Refer to Steering Wheel Position Sensor Or Steering Shaft Lower Bearing Replacement .
Did you complete the replacement?		 Go to Step 12  -
11 Replace the EBCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 Go to Step 12  -
12
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting test.
Does the DTC reset?		 Go to Step 2  System OK
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