GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2005 🢒 DeVille 🢒 Suspension 🢒 Electronic Suspension Control (ESC) 🢒 DTC P1652

Circuit Description

The powertrain control module (PCM) uses output driver modules (ODMs) to control many functions of the engine, and the transaxle. The ODMs supply the ground path for the PCM controlled device when the PCM commands the device ON. Each ODM is able to control several outputs. Unlike the quad driver modules (QDMs) used in earlier model years, the ODMs are able to diagnose each output circuit. The PCM monitors the ODMs for circuit conditions that are incorrect for the commanded state of the ODM. If the PCM detects an improper circuit condition in the ODM that controls suspension Lift/Dive, DTC P1652 will set.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P1652 Powertrain Induced Chassis Pitch Output Circuit

Conditions for Running the DTC
    • The engine is running.
    • The system voltage is between 8-16 volts.

Conditions for Setting the DTC
    • The PCM detects a circuit condition that is incorrect for the commanded state of the ODM that controls suspension Lift/Dive.
    • The condition is present for at least 10 seconds.

Action Taken When the DTC Sets
    • The PCM will not illuminate the malfunction indicator lamp (MIL).
    • The PCM will store the conditions present when the DTC set as Failure Records only.

Conditions for Clearing the MIL/DTC
    • The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
    • The DTC can be cleared by using the scan tool Clear DTC Information function.

Diagnostic Aids

If the condition is intermittent, refer to Intermittent Conditions in Engine Controls - 4.6L.

Step

Action

Values

Yes

No

1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

  1. Turn OFF the ignition.
  2. Disconnect the Lift/Dive connector.
  3. Connect test lamp between the Lift/Dive Signal Output circuit and ground.
  4. Turn ON the ignition, with the engine OFF.

Is the test lamp ON?

--

Go to Step 3

Go to Step 4

3

  1. Turn OFF the ignition.
  2. Leave the Lift/Dive disconnected.
  3. Disconnect the powertrain control module (PCM) connector.
  4. Turn ON the ignition, with the engine OFF.
  5. Test the Lift/Dive Signal Output circuit for a short to voltage.
  6. If the condition is found, repair, as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 11

Go to Step 10

4

  1. Leave the Lift/Dive disconnected.
  2. Connect test lamp between B+ and the Lift/Dive Signal Output circuit.

Is the test lamp ON?

--

Go to Step 5

Go to Step 6

5
  1. Turn OFF the ignition.
  2. Disconnect the PCM connector.
  3. Test the Lift/Dive Signal Output circuit for a short to ground.
  4. If the condition is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 11

Go to Step 10

6
  1. Turn OFF the ignition.
  2. Reconnect the Lift/Dive connector.
  3. Disconnect the PCM connector.
  4. Turn ON the ignition, with the engine OFF.
  5. Using DMM, measure the voltage between the Lift/Dive Signal Output circuit and ground.

Does the DMM indicate a voltage near the specified value?

B+

Go to Step 7

Go to Step 8

7
  1. Test for poor connections at the PCM.
  2. If the condition is found, repair, as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 11

Go to Step 10

8
  1. Test the Lift/Dive Signal Output circuit for an open or poor connections at the electronic suspension control (ESC) module.
  2. If the condition is found, repair, as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 11

Go to Step 9

9

Replace the ESC module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Is the action complete?

--

Go to Step 11

--

10

Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Is the action complete?

--

Go to Step 11

--

11
  1. Review and record scan tool Fail Records data.
  2. Clear DTCs.
  3. Operate the vehicle within Fail Records conditions.
  4. Using a scan tool, monitor Specific DTC information for DTC P1652 until the test runs.

Does the scan tool indicate DTC P1652 passed?

--

System OK

Go to Step 2