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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 48 (Air Suspension) >> Diagnostic Information and Procedures >> DTC C0718 >> Test Description

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. 3:  Tests whether the condition is module, system, or condition related.
  2. 4:  Tests for a short to voltage in the compressor battery positive voltage circuit or a defective air suspension relay.
  3. 6:  Tests if the DTC sets during normal operating conditions.
DTC C0718

Step Action 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, monitor the DTC Information for DTC C0718 in the Air Suspension Module.
Does the scan tool indicate that DTC C0718 is current?		 Go to Step 4  Go to Step 3 
3  Most occurrences of this DTC are caused by overload of the compressor. Review the Air Suspension System with the customer to verify the conditions under which the DTC set.
Did vehicle operation cause this DTC to set?		 Go to Diagnostic Aids Go to Step 4 
4 
  1. Turn OFF the ignition.
  2. Check for a defective air suspension relay.
  3. Disconnect the air suspension relay. Test for a short to voltage in the compressor battery positive voltage circuit. Refer to Circuit Testing and Wiring Repairs .
Does the DTC reset?		 Go to Step 5  System OK
5 Replace the air suspension compressor. Refer to Compressor Assembly Automatic Level Control Air Replacement (Dual Compressors)  or Compressor Assembly Automatic Level Control Air Replacement (Single Compressor) .
Did you complete the replacement?		 Go to Step 6  -
6 
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within normal operating conditions.
Does the DTC reset?		 Go to Step 7  System OK
7
  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?		 System OK -
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