DTC P025B:00

Fuel pump control module circuit range/performance problem

DETECTION CONDITION

• When any of the following conditions is met:

• Engine overheating is detected.

• Output duty ratio signal received from PCM is in error.

• Output signal from fuel pump control module is erratic (noise overlap).

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

• Stops fuel pump control (overheat detected)

POSSIBLE CAUSE

• Engine overheating

• Fuel pump control module connector or terminals malfunction

• PCM connector or terminals malfunction

• Short to ground in wiring harness between fuel pump control module terminal 1B and PCM terminal 2AE

• Short to power supply in wiring harness between fuel pump control module terminal 1B and PCM terminal 2AE

• Open circuit in wiring harness between fuel pump control module terminal 1B and PCM terminal 2AE

• Fuel pump control module malfunction

• PCM malfunction

STEP

INSPECTION

ACTION

1

• Has the FREEZE FRAME DATA (Mode 2)/snapshot data been recorded?

Yes

Go to the next step.

No

Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then go to the next step.

2

• 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.

3

• Verify the engine condition.

• Is the engine overheating?

Yes

Perform the symptom troubleshooting “NO.17 COOLING SYSTEM CONCERNS-OVERHEATING”.

(See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [SKYACTIV-G 2.5].)

No

Go to the next step.

4

• Switch the ignition off.

• 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 10.

No

Go to the next step.

5

• Disconnect the PCM 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 10.

No

Go to the next step.

6

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

• Inspect for continuity between fuel pump control module terminal 1B (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 control module terminal 1B and PCM terminal 2AE.

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 10.

No

Go to the next step.

7

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

• Switch the ignition ON (engine off).

  NOTE:

  • Another DTC may be stored by the PCM detecting an open circuit.

• Measure the voltage at the fuel pump control module terminal 1B (wiring harness-side).

• Is the voltage 0 V?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between fuel pump control module terminal 1B and PCM terminal 2AE.

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 power supply.

• Repair or replace the malfunctioning part.

If there is no common connector:

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

Go to Step 10.

8

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

• Switch the ignition off.

• Inspect for continuity between fuel pump control module terminal 1B (wiring harness-side) and PCM terminal 2AE (wiring harness-side).

• 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 fuel pump control module terminal 1B and PCM terminal 2AE.

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 10.

9

• Reconnect all disconnected connectors.

• 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.

10

• 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.

11

• 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.