P0627

P0627-FUEL PUMP CONTROL CIRCUIT/OPEN





For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
With the control circuit active and battery voltage greater than 10.4 volts.

- Set Condition:
The PCM detects an open or shorted condition in the (K31) Fuel Pump Relay Control circuit.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.Initial Inspection and Diagnostic Overview

Diagnostic Test

1. DTC IS ACTIVE
Turn the ignition on.
With the scan tool, Clear DTCs in the Powertrain Control Module (PCM).
With the scan tool, actuate the Fuel Pump Relay Control State.
With the scan tool, select View DTCs.
Is the status Active for this DTC?

Yes

- Go to 2

No

- REFER TO the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.Checking For An Intermittent DTC

2. INTERNAL FUSED B(+) CIRCUIT OPEN OR HIGH RESISTANCE




Turn the ignition off.
Remove the Fuel Pump Relay.
Turn the ignition on.
Using a 12 volt test light connected to ground, check the Internal Fused B(+) circuit in the Fuel Pump Relay connector.

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

Is the test light illuminated and bright?

Yes

- Go to 3

No

- Repair the Internal Fused B(+) circuit for an open circuit or high resistance.
- Perform the PCM Verification Test.Powertrain Verification Test

3. INTERNAL FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT OPEN OR HIGH RESISTANCE




Using a 12 volt test light connected to ground, check the Internal Fused Ignition Switch Output (Run-Start) circuit in the Fuel Pump Relay connector.

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

Is the test light illuminated and bright?

Yes

- Go to 4

No

- Repair the Internal Fused Ignition Switch Output (Run-Start) circuit for an open circuit or high resistance.
- Perform the PCM Verification Test.Powertrain Verification Test

4. (K31) FUEL PUMP RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE




Turn the ignition off.
Disconnect the Powertrain Control Module (PCM) connector.
Turn the ignition on.
Measure the voltage of the (K31) Fuel Pump Relay Control circuit in the Fuel Pump Relay connector.
Is there any voltage present?

Yes

- Repair the (K31) Fuel Pump Relay Control circuit for a short to voltage.
- Perform the PCM Verification Test.Powertrain Verification Test

No

- Go to 5

5. (K31) FUEL PUMP RELAY CONTROL CIRCUIT SHORTED TO GROUND




Turn the ignition off.
Measure the resistance between ground and the (K31) Fuel Pump Relay Control circuit in the Fuel Pump Relay connector.
Is the resistance below 100 ohms?

Yes

- Repair the (K31) Fuel Pump Relay Control circuit for a short to ground.
- Perform the PCM Verification Test.Powertrain Verification Test

No

- Go to 6

6. (K31) FUEL PUMP RELAY CONTROL CIRCUIT OPEN OR HIGH RESISTANCE




Measure the resistance of the (K31) Fuel Pump Relay Control circuit between the Fuel Pump Relay connector and the Powertrain Control Module (PCM) harness connector.
Is the resistance below 5.0 ohms?

Yes

- Go to 7

No

- Repair the (K31) Fuel Pump Relay Control circuit for an open circuit or high resistance.
- Perform the PCM Verification Test.Powertrain Verification Test

7. FUEL PUMP RELAY




Connect the Powertrain Control Module (PCM) connector.
Turn the ignition on.
With the scan tool, actuate the Fuel Pump Relay Control State control to the ON position.
Using a 12 volt test light connected to 12 volts, check the (K31) Fuel Pump Relay Control circuit in the Fuel Pump Relay harness connector.

NOTE: If the DTC is active, the actuation test may not be allowed by the PCM. If may be necessary to clear the DTCs before starting the actuation.

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

Is the test light illuminated and bright?

Yes

- Replace the Fuel Pump Relay.
- Perform the PCM Verification Test.Powertrain Verification Test

No

- Go to 8

8. POWERTRAIN CONTROL MODULE (PCM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Pump Relay and the Powertrain Control Module (PCM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Search for any Technical Service Bulletins that may apply.
Were any problems found?

Yes

- Repair as necessary.
- Perform the PCM Verification Test.Powertrain Verification Test

No

- Replace and program the Powertrain Control Module (PCM).
- Perform the PCM Verification Test.Powertrain Verification Test