P1629

Diagnostic Chart:

Engine Controls Schematics: AIR Motor, AIR Valve, AIR Relay and Theft Deterant Module:

CIRCUIT DESCRIPTION
The Theft Deterrent Module produces the Fuel Enable Signal based on input from the door lock cylinders, shock sensor, and rear compartment lock cylinder. The PCM monitors the Fuel Enable Signal during crank. If the proper signal is present on the Theft Deterrent Fuel Enable Circuit, the PCM enables fuel delivery to allow the engine to start. If the PCM detects that the fuel enable signal is not present or incorrect while an attempt is made to start the engine, DTC P1629 will set. A problem that affects inputs to the Theft Deterrent Module will also result in a missing or incorrect fuel enable signal to the PCM. The engine will not start as long as either condition is present. For further information on the Content Theft Deterrent System, Refer to A Diagnostic System Check - Theft Deterrent in Theft Deterrent.

CONDITIONS FOR RUNNING THE DTC
^ DTC P1626 is not present.
^ An attempt is made to start the engine.

CONDITIONS FOR SETTING THE DTC
^ The PCM detects an incorrect signal on the Theft Deterrent Fuel Enable Circuit.
^ The above conditions are present for longer than 2 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
^ The PCM will store conditions which were present when the DTC set as Failure Records data only. This information will not be stored as Freeze Frame data.

CONDITIONS FOR CLEARING THE MIL/DTC
^ A History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using a scan tool.

DIAGNOSTIC AIDS
Inspect for the following:

IMPORTANT: Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing or replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.

^ Poor terminal connection.
Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. Use a corresponding mating terminal to test for proper tension. Refer to Diagrams for diagnosis and repair.
^ Damaged harness.
Inspect the wiring harness for damage. If the harness inspection does not reveal a problem, observe the display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the scan tool display may indicate the location of the fault. Refer to Diagrams for diagnosis and repair.
^ Inspect the PCM and the engine grounds for clean and secure connections.

If the DTC is determined to be intermittent, reviewing the Failure Records can be useful in determining when the DTC was last set.

TEST DESCRIPTION
Numbers below refer to the step numbers on the Diagnostic Table:
9. This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed.