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Home >> Pontiac >> 2004 >> Aztek Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 271 (Antilock Brake System, Traction Control System & Stability Control System) >> Diagnostic Information and Procedures >> DTC U1651 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

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

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

Step Action Yes No
Schematic Reference:  ABS Schematics  
Connector End View Reference: ABS Connector End Views 
1 Did you perform the ABS Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - ABS 
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 in Wiring Systems.
Did you find and correct the condition?		 Go to Step 12  Go to Step 3 
3 
  1. Disconnect the EBCM harness connector.
  2. Install the J 39700  Universal Pinout Box with the. See Special Tools and Equipment . J 39700-530 Cable Adapter between the EBCM and the EBCM harness connector.
  3. Disconnect the steering angle sensor.
  4. Using a DMM, check the ground circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
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 in Wiring Systems.
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 in Wiring Systems.
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 in Wiring Systems.
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 in Wiring Systems.
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 Procedure .
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 C1651 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 in Steering Wheel and Column.
Did you complete the replacement?		 Go to Step 12  -
11 Replace the EBCM. Refer to Electronic Brake Control Module Replacement .
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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