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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 U1650 >> Test Description

Test Description

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

  1. 2:  Tests for a short to ground between the CAN HI and CAN LO circuits.
  2. 3:  Tests the CAN HI and CAN LO circuits for a short together.
  3. 4:  This test checks to see if steering angle sensor is centered.
DTC U1650

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
  1. Turn OFF the ignition.
  2. Disconnect the electronic brake control module (EBCM).
  3. Install the J 39700  Universal Pinout Box with the J 39700-530  Cable Adapter to the EBCM harness connector only. See Special Tools .
  4. Disconnect the steering angle sensor.
  5. Using the DMM, test the CAN HI and CAN LO circuits for a short to ground between the steering angle sensor and the EBCM. Refer to Testing for Short to Ground .
Did you find and correct the condition?
Go to Step 8  Go to Step 3 
Using the DMM, test the CAN HI and CAN LO circuits between the steering angle sensor and the EBCM for being shorted together. Refer to Circuit Testing .
Did you find and correct the condition?
Go to Step 8  Go to Step 4 
Perform the steering angle sensor centering procedure. Refer to Steering Angle Sensor Centering .
Did you successfully complete the centering procedure?
Go to Step 5  Go to Step 6 
5
  1. Use the scan tool in order to clear the DTCs.
  2. Test drive the vehicle. Refer to Diagnostic Test Drive .
Did DTC C1650 reset?
Go to Step 7  Go to Step 8 
6 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 8  -
7 Replace the EBCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?
Go to Step 8  -
8
  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