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.

2: This step determines if the Powertrain Induced Chassis Pitch control circuit is shorted to ground.
3: This step determines if the Powertrain Induced Chassis Pitch control circuit is open or, the PCM is unable to control the Powertrain Induced Chassis Pitch control circuit.

DTC P1652

Step	Action	Yes	No
Schematic Reference: Suspension Controls Schematics Connector End View Reference: Suspension Controls Connector End Views
1	Did you perform the Engine Controls Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - Engine Controls in Engine Controls
2	Turn OFF the ignition. Install a scan tool. Disconnect the ESC module connector C2. Refer to Electronic Suspension Control Module Replacement . Pull the terminal in the position 20 out of the C2 connector. Connect the C2 connector back into the ESC module. Turn ON the ignition leaving the engine OFF. Probe the Powertrain Induced Chassis Pitch Control circuit at the ESC terminal end using the test lampJ 35616-200 connected to B+. Refer to Using Connector Test Adapters in Wiring Systems. Does the test lamp illuminate?	Go to Step 4	Go to Step 3
3	Command the Chassis Pitch Signal ON using the scan tool. Does the test lamp illuminate?	Go to Diagnostic System Check - Electronic Suspension Control	Go to Step 5
4	Test the Chassis Pitch Control circuit for a short to ground. Refer to Testing for Continuity in Wiring Systems. If you find a grounded circuit, repair the circuit as necessary. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 8	Go to Step 7
5	Test the Chassis Pitch Control circuit for an open. Refer to Testing for Continuity in Wiring Systems. If you find an open circuit, repair the circuit as necessary. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 8	Go to Step 6
6	Inspect for a poor connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. If you find a poor connection, repair the terminal as necessary. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 8	Go to Step 7
7	Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls - 5.7L. Did you complete the replacement?	Go to Step 8	-
8	Use the scan tool in order to clear the DTCs. 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