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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 C0501, C0503, or C0504 >> 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 the EVO solenoid circuits in there active state using the scan tool.
  2. 3:  Tests if the EVO solenoid resistance is with in specified range.
  3. 4:  Tests for poor connections at the EVO solenoid harness connector.
  4. 5:  Tests if the control module is supplying a ground to the EVO solenoid.
  5. 6:  Tests for a short to ground on the EVO solenoid control circuit.
  6. 12:  Program the ESC module/BCM after replacement.
DTC C0501, C0503, or C0504

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 from OFF to ON.
Does the EVO solenoid turn OFF and ON 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. Measure the resistance of the EVO solenoid.
Does the resistance measure within the specified value?		 11-13Ω Go to Step 4  Go to Step 11 
4  Inspect the EVO solenoid harness connector control and supply circuits for poor connections. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS andCONNECTOR REPAIRS in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 5 
5 
  1. Probe the EVO solenoid control circuit at the solenoid harness connector with a test lamp connected to battery voltage.
  2. Turn ON the ignition, with the engine OFF.
Does the test lamp turn ON when the ignition is turned ON?		 - Go to Step 7  Go to Step 6 
6  Does the test lamp remain on continuously with the ignition ON or OFF? - Go to Step 8  Go to Step 9 
7
  1. Turn ON the ignition, with the engine OFF.
  2. With the scan tool, command the EVO solenoid OFF.
Does the test light turn OFF with initial command?		 - Go to Step 13  Go to Step 8 
8 Test the EVO solenoid control 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 13  Go to Step 12 
9 Test the EVO solenoid control circuit for a short to voltage or an open. Refer to TESTING FOR A SHORT TO VOLTAGE and WIRING REPAIRS in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 10 
10 Inspect the Suspension Control Module/BCM harness connector control circuit for poor connections. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS and CONNECTOR REPAIRS in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 12 
11 Replace the EVO solenoid. Refer to Power Steering (PS) Solenoid Actuator, Discharge Fitting Replacement .
Did you complete the replacement?		 - Go to Step 13  -
12  Replace the ESC module/BCM. Refer to ELECTRONIC SUSPENSION CONTROL MODULE REPLACEMENT (TAHOE/YUKON/ESCALADE) or ELECTRONIC SUSPENSION CONTROL MODULE REPLACEMENT (ESCALADE EXT) in Real Time Damping, or BODY CONTROL MODULE REPLACEMENT in Body Control System.
Did you complete the replacement?		 - Go to Step 13  -
13
  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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