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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 C0711 >> Test Description

Test Description

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

  1. 2 

    This step tests for the proper voltage output on the 5-volt reference circuit and the proper operation of the signal circuit.

  2. 3 

    This step tests for possible low 5-volt reference output or a problem with the signal circuit.

DTC C0711

Step Action Values Yes No
Schematic Reference: Suspension Controls Schematics 
Connector End View Reference: Suspension Controls Connector End Views 
1
IMPORTANT:

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

Did you perform the Real Time Damping (RTD) Diagnostic System Check?		 - Go to Step 2  Go to Diagnostic System Check - Real Time Damping 
2 
  1. Turn OFF the ignition.
  2. Disconnect the compressor/leveling module.
  3. Connect a 3-amp fused jumper wire between the 5-volt reference circuit and the signal circuit of the pressure sensor.
  4. Turn ON the ignition, with the engine OFF.
  5. With the scan tool, observe the Air Pressure Sensor parameter.
Does the scan tool indicate that the RTD Air Pressure Sensor parameter is between the specified voltage range?		 4.5 - 5.5 V Go to Step 8  Go to Step 3 
3  With the 3-amp fused jumper wire still connected, does the scan tool indicate that Air Pressure Sensor parameter is below the specified voltage value? 4.5 V Go to Step 5  Go to Step 4 
4 Test the 5-volt reference circuit of the air pressure 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 12  Go to Step 7 
5 Test the 5-volt reference circuit of the air pressure sensor for the following conditions:
  • An open
  • A short to ground
  • A high resistance

Refer to Circuit Testing , and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 12  Go to Step 6 
6 Test the signal circuit of the air pressure sensor for the following conditions:
  • An open
  • A short to ground
  • A high resistance

Refer to Circuit Testing , and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 12  Go to Step 11 
7 Test the signal circuit of the air pressure 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 12  Go to Step 11 
8 Test the low reference circuit of the air pressure sensor for the following conditions:
  • An open
  • A short to voltage
  • A high resistance

Refer to Circuit Testing , and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 12  Go to Step 9 
9 Inspect for poor connections at the harness connector of the air pressure 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 12  Go to Step 10 
10 Replace the pressure sensor. Refer to Automatic Level Control Air Dryer and Pressure Sensor Replacement .
Did you complete the replacement?		 - Go to Step 12  -
11
IMPORTANT:

After replacement, use the scan tool to perform the set up procedure (re-calibrate) located under Special Functions (F8: Recalibration) for the suspension control module.

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 12  -
12
  1. Clear the DTCs using the scan tool.
  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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