LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1248 (Electronic Power Steering System - Variable Effort Steering) >> Diagnostic Information and Procedures >> DTC C0470 or C0506 >> Test Description

Test Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Cadillac Escalade EXT. 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 if the sensor is within the valid voltage range.
  2. 3:  Tests for the proper operation of the circuit in the high voltage range.
  3. 4:  Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.
  4. 5:  Tests for a short to ground and an open in the 5 volt reference circuit.
  5. 7:  Test for a short to voltage, a high resistance, or an open circuit.
  6. 14:  The control module must be calibrated when replaced.
DTC C0470 or C0506

Step Action Value(s) Yes No
Schematic Reference:  Steering Controls Schematics  
1 If DTC C0870 is present perform the diagnosis for that DTC before proceeding.
Did you perform the Variable effort Steering Diagnostic System Check?		 - Go to Step 2  Go to Diagnostic System Check - Variable Effort Steering 
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the steering wheel position signal 1/signal 2 data parameter in the suspension Control Module data list.
Does the scan tool indicate that the steering wheel position signal 1/signal 2 data parameter is within the specified range?		 0.35-4.7 V Go to TESTING FOR INTERMITTENT AND POOR CONNECTIONS Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the steering wheel position sensor harness connector.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the steering wheel position signal 1/signal 2 data parameter.
Does the scan tool indicate that the steering wheel position signal 1/signal 2 data parameter is greater than the specified value?		 4.7 V Go to Step 4  Go to Step 8 
4 
  1. Turn OFF the ignition
  2. Connect a 3 amp fused jumper wire between the signal 1/signal 2 circuit and the low reference circuit of the steering wheel position sensor harness connector.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the steering wheel position signal 1/signal 2 data parameter.
Does the scan tool indicate that the steering wheel position signal 1/signal 2 data parameter is less than the specified value?		 0.35 V Go to Step 5  Go to Step 9 
5 
  1. Turn OFF the ignition.
  2. Disconnect the fused jumper wire.
  3. Connect a 3 amp fused jumper wire between the 5 volt reference circuit and the signal 1/signal 2 circuit of the steering wheel position sensor harness connector.
  4. Turn ON the ignition, with the engine OFF.
  5. With a scan tool, observe the steering wheel position signal 1/signal 2 data parameter.
Does the scan tool indicate that the steering wheel position signal 1/signal 2 data parameter is greater than the specified value?		 4.7 V Go to Step 7  Go to Step 6 
6 Test the 5 volt reference circuit of the steering wheel position sensor for a short to ground or an open. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 12 
7  Test the 5 volt reference circuit of the steering wheel position sensor for a short to voltage, a high resistance, or an open. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 11 
8 Test the signal 1/signal 2 circuit of the steering wheel position sensor for a short to ground. Refer to TESTING FOR SHORT TO GROUND and WIRING REPAIRS in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 12 
9 Test the signal 1/signal 2 circuit of the steering wheel position sensor for a short to voltage, a high resistance, or an open. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 10 
10 Test the low reference circuit of the steering wheel position sensor for a high resistance, a short to voltage or an open. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 12 
11 Inspect for poor connections at the harness connector of the steering wheel position sensor. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS and CONNECTOR REPAIRS in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 13 
12 Inspect for poor connections at the harness connector of the Suspension Control Module. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS and CONNECTOR REPAIRS in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 14 
13 Replace the steering wheel position sensor. Refer to Steering Wheel Position Sensor or Steering Shaft Lower Bearing Replacement 
Did you complete the replacement?		 - Go to Step 15  -
14 
IMPORTANT: After replacement, use the scan tool to perform the setup procedure located under Special Functions (F8: Recalibration) for the suspension control module.
Replace the suspension control module. Refer to ELECTRONIC SUSPENSION CONTROL MODULE REPLACEMENT (TAHOE/YUKON/ESCALADE) or ELECTRONIC SUSPENSION CONTROL MODULE REPLACEMENT (ESCALADE EXT) in Real Time Damping.Did you complete the replacement?		 - Go to Step 15  -
15
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTCs as specified in the supporting text.
Does the DTC reset?		 - Go to Step 2  System OK
scientia non olet · About LEMON Manuals