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Home >> GMC >> 2001 >> C3500 HD 8.1 G, Standard >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> Electronic Suspension - Suspension Damping & Automatic Level Control >> Diagnostic Information and Procedures >> DTC C0615, C0620, C0625, or C0630 >> Test Description

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

  1. 2 

    Check the supension position sensor data parameter.

  2. 3 

    Tests for the proper operation of the circuit in the low voltage range.

  3. 4 

    Tests for a short to voltage in the 5 volt reference circuit.

  4. 5 

    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.

  5. 7 

    Tests for a high resistance or an open in the ground circuit.

DTC C0615, C0620, C0625, or C0630

Step Action Value(s) Yes No
Schematic Reference: Suspension Controls Schematics 
1
IMPORTANT:

If DTC C0870 is present, perform the diagnosis for DTC C0870 first.

Did you perform the RTD Diagnostic System Check?		 - Go to Step 2  Go to Diagnostic System Check - Real Time Damping 
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the position sensor data parameter in the suspension control module data list.
Does the scan tool indicate that the position sensor data parameter is within the specified range?		 0.5-4.5 V Go to Diagnostic Aids Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the suspension position sensor connector.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the suspension position sensor data parameter.
Does the scan tool indicate that the position sensor data parameter is less than the specified value?		 0.5 V Go to Step 4  Go to Step 8 
4  Measure the voltage between the 5 volt reference circuit of the position sensor and a good ground.
Does the voltage measure near the specified value?		 5 V Go to Step 5  Go to Step 6 
5 
  1. Turn OFF the ignition.
  2. Connect a 3 amp fused jumper wire between the 5 volt reference circuit of the position sensor and the signal circuit of the position sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the position sensor data parameter.
Does the scan tool indicate that the position sensor data parameter is greater than the specified value?		 4.5 V Go to Step 7  Go to Step 9 
6 Does the voltage measure greater than the specified value? 5.5 V Go to Step 10  Go to Step 11 
7 
  1. Disconnect the fused jumper wire.
  2. Measure the voltage between the 5 volt reference circuit of the position sensor and the low reference circuit of the position sensor.
Does the voltage measure less than the specified value?		 3.5 V Go to Step 12  Go to Step 13 
8 Test the signal circuit of the position sensor for a short to voltage. Refer to Circuit Testing , and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 17  Go to Step 14 
9 Test the signal circuit of the position sensor for a short to ground, 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 17  Go to Step 14 
10 Test the 5 volt reference circuit of the position sensor for a short to voltage. Refer to Circuit Testing , and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 17  Go to Step 14 
11 Test the 5 volt reference circuit of the position sensor for a short to ground, 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 17  Go to Step 14 
12 Test the low reference circuit of the suspension position sensor for 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 17  Go to Step 14 
13 Inspect for poor connections at the harness connector of the suspension position 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 17  Go to Step 15 
14 Inspect for poor connections at the harness connector of the suspension control module. 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 17  Go to Step 16 
15 Replace the suspension position sensor. Refer to Electronic Suspension Front Position Sensor Replacement (25 Series 4WD) , Electronic Suspension Front Position Sensor Replacement (15 Series) , Electronic Suspension Front Position Sensor Replacement (25 Series 2WD) , , Electronic Suspension Rear Position Sensor Replacement - Left Side (15 Series) , Electronic Suspension Rear Position Sensor Replacement - Left Side (25 Series) , or Electronic Suspension Rear Position Sensor Replacement - Right Side (25 Series) .
Did you complete the replacement?		 - Go to Step 17  -
16
IMPORTANT:

When replacing the suspension control module the replacement module must be calibrated.

Replace the suspension control module. Refer to Electronic Suspension Control Module Replacement (Suburban/Yukon XL) , Electronic Suspension Control Module Replacement (Tahoe/Yukon) .Did you complete the replacement?		 - Go to Step 17  -
17
  1. Reconnect any previously disconnected components.
  2. Use the scan tool in order to clear the DTCs.
  3. Operate the vehicle (road test) 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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