For 1990-2009 cars only
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC P129D: Fuel Pump Driver Control Module Ignition 1 Switch Circuit Low VoltageDiagnostic Fault Information
Circuit | Short to Ground | Open or High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
IGN Voltage | P129D | P129D | -- | -- |
Circuit/System Description
The fuel pump flow control module (FPCM) monitors the IGN voltage circuit in order to determine if the voltage is within the normal operating range.
Conditions for Running the DTC
| • | The key is in Run or Crank. |
| • | The engine is running. |
Conditions for Setting the DTC
| • | The FPCM detects that the IGN voltage is less than 6.0 V. |
| • | The above condition is present for 7 seconds. |
Action Taken When the DTC Sets
DTC P129D is a Type A DTC.
Conditions for Clearing the DTC
DTC P129D is a Type A DTC.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Fuel Pump Flow Control Module Scan Tool Information for scan tool information
Circuit/System Testing
Important:
- Verify that DTC P0562 is not set.
- Ignition OFF, disconnect the harness connectors at the FPCM, and X2 at the FPCM relay.
- Connect a test lamp between the appropriate IGN voltage circuit terminals listed below and ground.
- Ignition ON, verify the test lamp turns on.
- Ignition OFF, connect the harness connector at the FPCM.
- Connect a test lamp between the X2 FPCM relay harness connector terminal 5 and ground.
- Ignition ON, verify the test lamp is ON.
- If all circuits test normal, replace the FPCM relay.
| ⇒ | If DTC P0562 is set, refer to DTC P0562. |
| • | FPCM terminal 15 |
| • | FPCM relay terminal 5 |
| ⇒ | If the test lamp is OFF, test the IGN voltage circuit a short to ground or an open/high resistance. |
| ⇒ | If the test lamp is OFF, test the IGN voltage circuit an open/high resistance. If the circuit tests normal, replace the FPCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for FPCM replacement, setup, and programming |
