DTC P120F:00 [MZR 2.3 DISI Turbo]

DTC P120F:00	Fuel pressure regulator excessive variation
DETECTION CONDITION	• If the fuel pressure average value measured by the PCM exceeds the specification when the camshaft is rotating at a specified rate, the PCM determines that there is a fuel pressure regulator performance problem. Diagnostic support note • This is a continuous monitor (CCM). • The MIL does not illuminate. • FREEZE FRAME DATA (Mode 2)/Snapshot data is not available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• High pressure fuel pump connector or terminals malfunction • PCM connector or terminals malfunction • Spill valve control solenoid valve malfunction • PCM malfunction

DTC P120F:00

Fuel pressure regulator excessive variation

DETECTION CONDITION

• If the fuel pressure average value measured by the PCM exceeds the specification when the camshaft is rotating at a specified rate, the PCM determines that there is a fuel pressure regulator performance problem.

Diagnostic support note

• This is a continuous monitor (CCM).

• The MIL does not illuminate.

• FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.

• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• High pressure fuel pump connector or terminals malfunction

• PCM connector or terminals malfunction

• Spill valve control solenoid valve malfunction

• PCM malfunction

STEP	INSPECTION	ACTION
1	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
No	Go to the next step.
2	INSPECT HIGH PRESSURE FUEL PUMP CONNECTOR CONDITION • Switch the ignition to off. • Disconnect the high pressure fuel pump connector. • Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 5.
No	Go to the next step.
3	INSPECT PCM CONNECTOR CONDITION • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 5.
No	Go to the next step.
4	INSPECT SPILL VALVE CONTROL SOLENOID VALVE • Reconnect the high pressure fuel pump and PCM connectors. • Inspect the spill valve control solenoid valve. (See HIGH PRESSURE FUEL PUMP INSPECTION [MZR 2.3 DISI Turbo].) • Is there any malfunction?	Yes	Replace the high pressure fuel pump, then go to the next step. (See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)
No	Go to the next step.
5	VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [MZR 2.3 DISI Turbo].) • Start the engine. • Perform the DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].) • Is the same DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].) Go to the next step.
No	Go to the next step.
6	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZR 2.3 DISI Turbo].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 2.3 DISI Turbo].)
No	DTC troubleshooting completed.

STEP

INSPECTION

ACTION

VERIFY RELATED SERVICE INFORMATION AVAILABILITY

• Verify related Service Information availability.

• Is any related Service Information available?

Yes

Perform repair or diagnosis according to the available Service Information.

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

Go to the next step.

INSPECT HIGH PRESSURE FUEL PUMP CONNECTOR CONDITION

• Switch the ignition to off.

• Disconnect the high pressure fuel pump connector.

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

• Is there any malfunction?

Yes

Repair or replace the connector and/or terminals, then go to Step 5.

Go to the next step.

INSPECT PCM CONNECTOR CONDITION

• Disconnect the PCM connector.

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

• Is there any malfunction?

Yes

Repair or replace the connector and/or terminals, then go to Step 5.

Go to the next step.

INSPECT SPILL VALVE CONTROL SOLENOID VALVE

• Reconnect the high pressure fuel pump and PCM connectors.

• Inspect the spill valve control solenoid valve.

(See HIGH PRESSURE FUEL PUMP INSPECTION [MZR 2.3 DISI Turbo].)

• Is there any malfunction?

Yes

Replace the high pressure fuel pump, then go to the next step.

(See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)

Go to the next step.

VERIFY DTC TROUBLESHOOTING COMPLETED

• Make sure to reconnect all disconnected connectors.

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

(See AFTER REPAIR PROCEDURE [MZR 2.3 DISI Turbo].)

• Start the engine.

• Perform the DTC Reading Procedure.

(See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].)

• Is the same DTC present?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the PCM.

(See PCM REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE

• Perform the “AFTER REPAIR PROCEDURE”.

(See AFTER REPAIR PROCEDURE [MZR 2.3 DISI Turbo].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [MZR 2.3 DISI Turbo].)

DTC troubleshooting completed.