GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 2001 🢒 Aurora 🢒 Engine 🢒 Engine Controls - 4.0L 🢒 DTC P0412

Circuit Description

The powertrain control module (PCM) uses the output driver modules (ODMs) in order 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 can 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 the AIR vacuum control solenoid valve, diagnostic trouble code (DTC) P0412 will set.

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 an improper voltage level on the output circuit that controls the AIR vacuum control solenoid valve.
    • The condition exists for at least 10 seconds.

Action Taken When the DTC Sets
    • The PCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test runs and fails.
    • The PCM stores the conditions present when the DTC set as Freeze Frame/Failure Records data.

Conditions for Clearing the MIL/DTC
    • The PCM will turn the MIL OFF after the third consecutive trip in which the diagnostic runs and passes.
    • 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.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. Listen for a click when the solenoid valve operates. Ensure that both the ON and the OFF states are commanded. Repeat the commands as necessary.

    2.

  2. This step tests for voltage to the AIR solenoid valve.

    3.

  3. This step verifies that the PCM is providing ground to the AIR solenoid valve.

    4.

  4. This step tests if a ground is constantly being applied to the AIR solenoid valve.

Step

Action

Yes

No

Schematic Reference: Engine Controls Schematics

1

Did you perform the Diagnostic System Check-Engine Controls?

Go to Step 2

Go to Diagnostic System Check - Engine Controls

2

Are the following DTCs set?

    • P0102
    • P0410
    • P0418
    • P0419, if the vehicle is equipped with a dual secondary AIR injection system
    • P0443

Go to Step 3

Go to Step 4

3

Important: Replace the fuse after completing the repair.

Locate and repair the following circuit conditions:

    • Any short to ground in the ignition feed circuit
    • Any shorted component that shares the ignition feed fuse--Refer to Power Distribution Schematics in Wiring Systems.

Did you complete the repair?

Go to Step 17

--

4

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Use a scan tool in order to command the AIR solenoid valve ON and OFF.

Does the AIR solenoid valve turn ON and OFF with each command?

Go to Step 5

Go to Step 6

5
  1. Review the Freeze Frame/Failure Records data for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for running the DTC, as specified in the supporting text. Attempt to duplicate the Freeze Frame/Failure Records data that you observed.

Does the DTC reset?

Go to Step 6

Go to Intermittent Conditions

6

  1. Turn OFF the ignition.
  2. Disconnect the AIR solenoid valve electrical connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the AIR solenoid valve B+ supply circuit with the test lamp J 35616-200 connected to ground. Refer to Probing Electrical Connectors in Wiring Systems.

Does the test lamp illuminate?

Go to Step 7

Go to Step 13

7

  1. Connect a test lamp between the control circuit of the AIR solenoid valve and the B+ supply circuit of the AIR solenoid valve.
  2. Use a scan tool in order to command the AIR solenoid valve ON and OFF.

Does the test lamp turn ON and OFF with each command?

Go to Step 11

Go to Step 8

8

Does the test lamp remain illuminated with each command?

Go to Step 10

Go to Step 9

9
  1. Test the control circuit of the AIR solenoid valve for the following conditions:
    2. • A short to voltage
    • An open--Refer to Circuit Testing in Wiring Systems.
  2. If you find a condition, repair the condition as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 16

Go to Step 12

10
  1. Test the control circuit of the AIR solenoid valve for a short to ground. Refer to Circuit Testing in Wiring Systems.
  2. If you find a condition, repair the condition as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 16

Go to Step 15

11
  1. Inspect for poor connections at the AIR solenoid valve. Refer to Testing for Electrical Intermittents in Wiring Systems.
  2. If you find a condition, repair the condition as necessary. Refer to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 16

Go to Step 14

12
  1. Inspect for poor connections at the PCM. Refer to Testing for Electrical Intermittents in Wiring Systems.
  2. If you find a condition, repair the condition as necessary. Refer to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 16

Go to Step 15

13

Repair the B+ supply circuit for the AIR solenoid valve. Refer to Wiring Repairs in Wiring Systems.

Is the action complete?

Go to Step 16

--

14

Replace the AIR solenoid valve. Refer to Secondary Air Injection Vacuum Control Solenoid Valve Replacement .

Did you complete the replacement?

Go to Step 16

--

15

Replace the PCM. Refer to Powertrain Control Module Replacement .

Did you complete the replacement?

Go to Step 16

--

16
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC, as specified in the supporting text.

Does the DTC run and pass?

Go to Step 17

Go to Step 2

17

With a scan tool observe the stored information, Capture info.

Does the scan tool display any DTCs that you have not diagnosed?

Go to Diagnostic Trouble Code (DTC) List

System OK