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Test Description

WARNING: This page is about a different car, the 2007 Hummer H2. 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:  Test for the proper operation of the compressor and compressor relay.
  2. 3:  Tests for open circuits in the compressor battery positive voltage circuit and compressor ground circuit.
  3. 4:  Tests for voltage in the 5-volt reference circuit.
  4. 5:  Tests for a high resistance or for an open in the low reference circuit.
  5. 10:  Check for open or high resistance in the sensor ground circuit.
  6. 14:  The replacement suspension module calibration must be checked and calibrated if necessary.
DTC C0711

Step Action Values Yes No
Schematic Reference: Air Suspension Schematics 
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
IMPORTANT: Be sure all doors are closed and engine is running for this test.
  1. Install a scan tool.
  2. Turn ON ignition, with the engine ON.
  3. With a scan tool, activate compressor test in scan tool output controls.
Does the compressor run and rear of vehicle raise?		 - Go to Diagnostic Aids Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Check for open in 60-amp ECAS fuse.
  3. Check for defective air suspension relay.
  4. Check for open or poor connections in compressor battery positive voltage circuit.
  5. Check for open or poor connections in compressor ground circuit.
  6. Check for a damaged air suspension sensor LR or RR.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 4 
4 
  1. Turn ON the ignition.
  2. Disconnect the air suspension pressure sensor.
  3. Measure the voltage between the 5-volt reference circuit of the air pressure sensor and the low reference circuit of the air pressure sensor.
Is the voltage less than the specified value?		 5 V Go to Step 5  Go to Step 6 
5 
  1. Turn OFF the ignition.
  2. Measure the resistance from the low reference circuit of the air pressure sensor to a good ground.
Is the resistance less than the specified value?		 5 Ω Go to Step 7  Go to Step 10 
6 Test the 5-volt reference circuit of the air pressure sensor for a short to voltage. Refer to Circuit Testing and Testing for a Short to Voltage .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 12 
7 Test the 5-volt reference circuit of the air pressure sensor for one of the following conditions:
  • A short to ground
  • A high resistance
  • An open

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 12 
8 Test the signal circuit of the air pressure sensor for one of the following conditions:
  • A short to ground
  • A high resistance
  • An open

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 9 
9 Test the signal circuit of the air pressure sensor for a short to voltage. Refer to Testing for a Short to Voltage and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 12 
10 
  1. Disconnect the air suspension module.
  2. Test the low reference circuit of the air pressure sensor for a high resistance or for an open. Refer to Circuit Testing and Wiring Repairs .
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 air pressure sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs .
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 air suspension module. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 14 
13 Replace the air suspension pressure sensor. Refer to Valve Automatic Level Control Solenoid Replacement (Dual Compressors)  or Valve Automatic Level Control Solenoid Replacement (Single Compressor) .
Did you complete the replacement?		 - Go to Step 15  -
14 
  1. Replace the air suspension module. Refer to Control Module References .
  2. Perform the trim height calibration procedure for the air suspension module if necessary after check trim height procedure.
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 DTC.
Does the DTC reset?		 - Go to Step 2  System OK
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