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

Steps 1-4:

Steps 5-17:

The numbers below refer to the step numbers on the diagnostic table.
4. 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.
6. This step tests for voltage to the AIR solenoid valve.
7. This step verifies that the PCM is providing ground to the AIR solenoid valve.
8. This step tests if a ground is constantly being applied to the AIR solenoid valve.