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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:  Checks the Air Suspension Sensor-RR data parameter.
  2. 3:  Tests for the proper operation of the circuit in the high voltage range.
  3. 4:  Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens upon performing this test, the signal circuit has a short to voltage.
  4. 5:  Tests for a short to ground in the 5-volt reference circuit.
  5. 7:  Test the 5-volt reference circuit for the air suspension sensor - RR.
DTC C0631

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 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Right Height Sensor parameter in the data list for the air suspension module.
Is the Right Height Sensor parameter within the specified range?		 0.3-4.7 V Go to Diagnostic Aids Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the air suspension sensor - RR.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Right Height Sensor parameter.
Is the Right Height Sensor parameter more than the specified value?		 0.3 V Go to Step 4  Go to Step 8 
4 
  1. Turn OFF the ignition.
  2. Connect a 3-ampere fused jumper wire between the signal circuit of the air suspension sensor - RR and the low reference circuit of the air suspension sensor - RR.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Right Height Sensor parameter.
Is the Right Height Sensor parameter less than the specified value?		 0.3 V Go to Step 5  Go to Step 9 
5 
  1. Turn OFF the ignition.
  2. Disconnect the fused jumper wire.
  3. Turn ON the ignition, with the engine OFF.
  4. Test the 5-volt reference circuit voltage of the air suspension sensor - RR.
Is the Right Height Sensor 5-volt reference voltage greater than the specified value?		 4.7 V Go to Step 7  Go to Step 6 
6 Test the 5-volt reference circuit of the Air Suspension Sensor-RR for a short to ground. Refer to Circuit Testing and Wiring Repairs .
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 suspension sensor - RR for one of the following conditions:
  • A short to voltage
  • 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 11 
8 Test the signal circuit of the Air Suspension Sensor-RR for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 12 
9 Test the signal circuit of the air suspension sensor - RR for one of the following conditions:
  • A short to voltage
  • 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 10 
10 Test the low reference circuit of the air suspension sensor - RR for one of the following conditions:
  • 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 
11 Inspect for poor connections at the harness connector of the air suspension sensor - RR. 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 sensor - RR. Refer to Air Spring Leveling Sensor Replacement .
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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