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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 C0496, C0498, or C0499 >> Test Description

Test Description

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

  1. 2:  Tests the EVO solenoid circuits in there active state using the scan tool.
  2. 3:  Tests if the BCM/ESC module is providing voltage to the EVO solenoid.
  3. 4:  Tests for an open in the control circuit to the EVO solenoid.
  4. 5:  Tests if voltage is constantly being applied to the EVO solenoid.
  5. 13:  Reprogram the BCM/ESC module when replacement is necessary.
DTC C0496, C0498, or C0499

Step Action Value(s) Yes No
Schematic Reference: Steering Controls Schematics 
1 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, command the EVO solenoid ON and OFF.
Does the EVO solenoid turn ON and OFF with each command?		 - Go to TESTING FOR INTERMITTENT AND POOR CONNECTIONS in Wiring Systems Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the EVO solenoid.
  3. Turn ON the ignition, with the engine OFF.
  4. With a test lamp connected to a ground probe the EVO solenoid supply circuit at the solenoid harness connector.
  5. With a scan tool, command the EVO solenoid ON.
Does the test lamp turn ON with initial command?		 - Go to Step 4  Go to Step 5 
4 
  1. Connect a test lamp between the EVO solenoid supply circuit and the EVO solenoid control circuit of the solenoid harness connector.
  2. With a scan tool, command the EVO solenoid ON.
Does the test lamp turn ON with initial command?		 - Go to Step 8  Go to Step 10 
5  Does the test lamp remain illuminated continuously with each command? - Go to Step 7  Go to Step 6 
6 Test the EVO solenoid supply circuit 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 14  Go to Step 9 
7 Test the EVO solenoid supply circuit for 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 14  Go to Step 9 
8 Inspect for poor connections at the harness connector of the EVO solenoid. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS and CONNECTOR REPAIRS in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 14  Go to Step 11 
9 Inspect for poor connections at the harness connector of the BCM/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 14  Go to Step 13 
10 Repair the control circuit of the EVO solenoid. Refer to WIRING REPAIRS in Wiring Systems.
Did you complete the repair?		 - Go to Step 14  -
11 Measure the resistance of the EVO solenoid.
Does the resistance measure within the specified value?		 11-13 Ω Go to Step 13  Go to Step 12 
12 Replace the EVO solenoid. Refer to Power Steering (PS) Solenoid Actuator, Discharge Fitting Replacement 
Did you complete the replacement?		 - Go to Step 14  -
13  Replace the BCM/ESC module. Refer to BODY CONTROL MODULE REPLACEMENT in Body Control Systems, or 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 14  -
14
  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 text.
Does the DTC reset?		 - Go to Step 2  System OK
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