The engine control module (ECM) supplies a high voltage signal to the fuel pump control module (FPCM) when the ECM detects that the ignition is on. The high voltage signal from the ECM to the FPCM remains active for two seconds, unless the engine is in crank or run. While this signal is being received, the FPCM closes the ground switch of the fuel pump and also supplies a varying voltage to the fuel tank pump module in order to maintain the desired fuel rail pressure.

The engine is running.

DTC P2635 is an A type DTC.

DTC P2635 is an A type DTC.

Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Fuel System Description

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Important: Verify that DTC P0231, P0232, or P023F are not set as current or history before performing this diagnostic. If any of those codes are set as current or history, go to DTC P0231, P0232, or P023F .

1. Ignition OFF, disconnect the harness connector at the fuel tank pump module.
2. Ignition ON, test for 1.0 ohm or less between the fuel pump module low reference circuit terminal 2 and ground.

⇒	If greater than the specified range, test the fuel pump module low reference circuit for a high resistance. If the circuit tests normal, replace the FPCM.

3. Ignition OFF, disconnect the harness connector of the FPCM. Test for 1.0 ohm or less between the voltage supply circuit terminal 1 and the FPCM terminal 47.

⇒	If greater than the specified range, test the voltage supply circuit for a high resistance. If the circuit tests normal, replace the FPCM.

4. If all circuits test normal, go to Symptoms - Engine Controls to check for any intermittent symptoms and ensure that the fuel pressure is normal. If there are no symptoms and the fuel pressure is normal, replace the fuel tank pump module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

The engine control module (ECM) supplies a high voltage signal to the fuel pump control module (FPCM) when the ECM detects that the ignition is on. The high voltage signal from the ECM to the FPCM remains active for two seconds, unless the engine is in crank or run. While this signal is being received, the FPCM closes the ground switch of the fuel pump and also supplies a varying voltage to the fuel tank pump module in order to maintain the desired fuel rail pressure.

The engine is running.

DTC P2635 is an B type DTC.

DTC P2635 is an B type DTC.

Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Fuel System Description

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Important: Verify that DTC P0231, P0232, or P023F are not set as current or history before performing this diagnostic. If any of those codes are set as current or history, go to DTC P0231, P0232, or P023F.

1. Ignition OFF, disconnect the harness connector at the fuel tank pump module.
2. Ignition ON, test for 1.0 ohm or less between the fuel pump module low reference circuit terminal 2 and ground.

⇒	If greater than the specified range, test the fuel pump module low reference circuit for a high resistance. If the circuit tests normal, replace the FPCM.

3. Ignition OFF, disconnect the harness connector of the FPCM. Test for 1.0 ohm or less between the voltage supply circuit terminal 1 and the FPCM terminal 47.

⇒	If greater than the specified range, test the voltage supply circuit for a high resistance. If the circuit tests normal, replace the FPCM.

4. If all circuits test normal, go to Symptoms - Engine Controls to check for any intermittent symptoms and ensure that the fuel pressure is normal. If there are no symptoms and the fuel pressure is normal, replace the fuel tank pump module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.