DTC P0092 (Flash Code 247) Fuel Pressure Regulator Control Circuit High (RZ4E-TC)

1. Engine control system check

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) Diagnostic system check-engine controls".

2. Inspection for short to power supply in FRP regulator high-side circuit

1) Turn OFF the ignition switch.

2) Disconnect the FRP regulator harness connector (E52).

3) Disconnect the ECM harness connector (E4).

4) Connect a test lamp between the FRP regulator high-side circuit (pin 1 of E52) and the body ground.

Refer to "RHD Engine Control (RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "LHD Engine Control (RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).

5) Turn ON the ignition switch. Does the test lamp illuminate?

Yes

Repair the short to the battery power supply circuit or the short to the ignition power supply circuit in the high-side circuit between the ECM (pins 24 and 32 of E4) and the FRP regulator (pin 1 of E52).

=>Go to Repair verification.

No

=>Go to Inspection for short to power supply in FRP regulator low-side circuit.

3. Inspection for short to power supply in FRP regulator low-side circuit

1) Connect a test lamp between the FRP regulator low-side circuit (pin 2 of E52) and the body ground.

Refer to "RHD Engine Control (RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "LHD Engine Control (RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).

2) Turn ON the ignition switch. Does the test lamp illuminate?

Yes

Repair the short to the battery power supply circuit or the short to the ignition power supply circuit in the low-side circuit between the ECM (pins 8 and 16 of E4) and the FRP regulator (pin 2 of E52).

=>Go to Repair verification.

No

=>Go to Inspection for short circuit in FRP regulator circuit.

4. Inspection for short circuit in FRP regulator circuit

1) Inspect the FRP regulator circuit (pins 1 and 2 of E52) for a short circuit. Is the result normal?

Refer to "RHD Engine Control (RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "LHD Engine Control (RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Yes

=>Go to ECM replacement.

No

Repair the circuit as necessary.

=>Go to Repair verification.

5. ECM replacement

Refer to "1.Engine 1Z.Engine Electrical Control(RZ4E-TC) ECM removal".

Refer to "1.Engine 1Z.Engine Electrical Control(RZ4E-TC) ECM installation".

Refer to "1.Engine 1Z.Engine Electrical Control(RZ4E-TC) ECM setting".

Procedure completion

=>Go to Repair verification.

6. Repair verification

1) Clear the DTC with a scan tool.

2) Turn OFF the ignition switch for 30 seconds or more.

3) Start the engine.

4) Operate the vehicle under the conditions for running the DTC.

5) Observe the DTC information with a scan tool.