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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1528 (Suspension Control System - Suspension Damping) >> Diagnostic Information and Procedures >> DTC C0665 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. 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:  Tests the normal state of the chassis pitch angle using a scan tool. The scan tool will display normal state as Inactive, and Active with chassis pitch angle detected.
  2. 3:  Tests if the PCM is supplying a constant ground on the chassis pitch angle signal circuit.
  3. 4:  Tests if the ESC module is able to detect a change in chassis pitch angle. With the chassis pitch angle signal circuit jumpered to ground, the scan tool will display Chassis Pitch Angle status as Active.
DTC C0665

Step Action Yes No
Schematic Reference: Suspension Controls Schematics 
Connector End View Reference: Suspension Controls Connector End Views 
1 Did you perform the Electronic Suspension Control Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Electronic Suspension Control 
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Chassis Pitch Angle parameter in the ESC data list.
Does the scan tool display Inactive?		 Go to Step 4  Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Chassis Pitch Angle parameter.
Does the scan tool display Inactive?		 Go to Step 8  Go to Step 6 
4 
  1. Turn OFF the ignition.
  2. Disconnect the PCM connectors. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls.
  3. Connect a 3-amp fused jumper wire between the chassis pitch angle circuit at the PCM connector and a good ground.
  4. Turn ON the ignition, with the engine OFF.
  5. With a scan tool, observe the Chassis Pitch Angle data parameter.
Does the scan tool display Active?		 Go to Step 8  Go to Step 5 
5 Test the Chassis Pitch Angle circuit for an open or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 11  Go to Step 7 
6 Test the Chassis Pitch Angle circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 11  Go to Step 7 
7 Inspect for poor connections at the harness connector of the ESC 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 11  Go to Step 9 
8 Inspect for poor connections at the harness connector of the PCM. 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 11  Go to Step 10 
9 Replace the ESC module. Refer to Electronic Suspension Control Module Replacement .
Did you complete the replacement?		 Go to Step 11  -
10
IMPORTANT: Perform the set up procedure for the PCM.
Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls.Did you complete the replacement?		 Go to Step 11  -
11
  1. Use the scan tool in order to clear the DTCs.
  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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