DTC P0628:00

Fuel pump control module circuit low input

DETECTION CONDITION

• When the PCM outputs a duty signal to the fuel pump control module, the difference in voltage between fuel pump unit terminals B and D is less than 1.5 V for a continuous 5 s.

Diagnostic support note

• This is a continuous monitor (CCM).

• The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle.

• FREEZE FRAME DATA (Mode 2)/Snapshot data is available.

• DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

Not applicable

POSSIBLE CAUSE

• Fuel pump unit connector or terminals malfunction

• Fuel pump unit malfunction

• Fuel pump control module connector or terminals malfunction

• Short to ground in wiring harness between fuel pump unit terminal A and fuel pump control module terminal 2C

• Open circuit in wiring harness between the following terminals:

• Fuel pump unit terminal A—Fuel pump control module terminal 2C

• Fuel pump unit terminal B—Fuel pump control module terminal 2D

• Fuel pump control module malfunction

• PCM malfunction

STEP

INSPECTION

ACTION

1

• Verify related Service Bulletins and/or on-line repair information availability.

• Is any related repair information available?

Yes

Perform repair or diagnosis according to the available repair information.

• If the vehicle is not repaired, go to the next step.

No

Go to the next step.

2

• Switch the ignition off.

• Disconnect the fuel pump unit connector.

• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the connector and/or terminals, then go to Step 8.

No

Go to the next step.

3

• Inspect the fuel pump unit.

  (See FUEL PUMP UNIT INSPECTION [SKYACTIV-G 2.5].)

• Is there any malfunction?

Yes

Replace the fuel pump unit, then go to Step 8.

(See FUEL PUMP UNIT REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)

No

Go to the next step.

4

• Disconnect the fuel pump control module connector.

• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the connector and/or terminals, then go to Step 8.

No

Go to the next step.

5

• Verify that the fuel pump unit and fuel pump control module connectors are disconnected.

• Inspect for continuity between fuel pump unit terminal A (wiring harness-side) and body ground.

• Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between fuel pump unit terminal A and fuel pump control module terminal 2C.

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to ground.

Go to Step 8.

No

Go to the next step.

6

• Verify that the fuel pump unit and fuel pump control module connectors are disconnected.

• Inspect for continuity between the following terminals (wiring harness-side):

• Fuel pump unit terminal A—Fuel pump control module terminal 2C

• Fuel pump unit terminal B—Fuel pump control module terminal 2D

• Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

• Fuel pump unit terminal A—Fuel pump control module terminal 2C

• Fuel pump unit terminal B—Fuel pump control module terminal 2D

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has an open circuit.

Go to Step 8.

7

• Inspect the fuel pump control module.

  (See FUEL PUMP CONTROL MODULE INSPECTION [SKYACTIV-G 2.5].)

• Is there any malfunction?

Yes

Replace the fuel pump control module, then go to the next step.

(See FUEL PUMP CONTROL MODULE REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)

No

Go to the next step.

8

• Always reconnect all disconnected connectors.

• Clear the DTC from the PCM memory using the M-MDS.

  (See AFTER REPAIR PROCEDURE [SKYACTIV-G 2.5].)

• Perform the KOEO or KOER self test.

  (See KOEO/KOER SELF TEST [SKYACTIV-G 2.5].)

• Is the same DTC present?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the PCM.

  (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)

Go to the next step.

No

Go to the next step.

9

• Perform the “AFTER REPAIR PROCEDURE”.

  (See AFTER REPAIR PROCEDURE [SKYACTIV-G 2.5].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [SKYACTIV-G 2.5].)

No

DTC troubleshooting completed.