DTC P0641 Sensor Reference Voltage 1 Circuit (4JJ3 with DPD)

1. Engine control system check

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) Diagnostic system check-engine controls".

2. Current DTC check

1) Connect the scan tool.

2) Turn OFF the ignition switch for 1 minute or more.

3) Start the engine.

4) Observe the DTC information with a scan tool. Is a DTC set?

Yes

=>Go to 5 V reference voltage check for accelerator pedal position sensor 1.

No

Go to Intermittent conditions of engine.

Refer to "202.Engine 15D.Symptom(4JJ3 with DPD) intermittent conditions of engine".

3. 5 V reference voltage check for accelerator pedal position sensor 1

1) Turn OFF the ignition switch.

2) Disconnect the accelerator pedal position sensor harness connector (C67).

3) Turn ON the ignition switch.

4) Measure the voltage between the 5 V reference circuit (pin 4 of C67) of accelerator pedal position sensor 1 and the body ground with a DMM.

Refer to "RHD Engine Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "LHD Engine Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Value: 4.5 to 5.5 V

The reading is more than the specified value.

=>Go to Inspection for short to power supply in 5 V reference circuit.

The reading is within the specified range.

Replace the accelerator pedal.

Refer to "1.Engine 1I.Speed Control Systems(4JJ3 with DPD) accelerator pedal removal".

Refer to "1.Engine 1I.Speed Control Systems(4JJ3 with DPD) accelerator pedal installation".

=>Go to Repair verification.

The reading is less than the specified value.

=>Go to CKP sensor 5 V reference voltage check.

4. CKP sensor 5 V reference voltage check

1) Turn OFF the ignition switch.

2) Disconnect the CKP sensor harness connector (E30).

3) Turn ON the ignition switch.

4) Measure the voltage between the 5 V reference circuit (pin 4 of C67) of accelerator pedal position sensor 1 and the body ground with a DMM. Is the voltage more than or equal to the specified value?

Refer to "RHD Engine Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "LHD Engine Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Value: 4.5 V

Yes

Replace the CKP sensor.

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) CKP sensor removal".

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) CKP sensor installation".

=>Go to Repair verification.

No

=>Go to Inspection for short to ground in 5 V reference circuit.

5. Inspection for short to ground in 5 V reference circuit

1) Inspect 5 V reference circuit 1 between the ECM (pin 30 of C8) and accelerator pedal position sensor 1 (pin 4 of C67) for a short to ground or a short to the low reference circuit. Is the result normal?

Refer to "RHD Engine Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "LHD Engine Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

2) Inspect 5 V reference circuit 7 between the ECM (pin 31 of E3) and the CKP sensor (pin 3 of E30) for a short to ground or a short to the low reference circuit. Is the result normal?

Refer to "RHD Engine Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "LHD Engine Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

3) Are all of the results normal?

Yes

=>Go to ECM replacement.

No

Repair the circuit as necessary.

=>Go to Repair verification.

6. Inspection for short to power supply in 5 V reference circuit

1) Inspect 5 V reference circuit 1 between the ECM (pin 30 of C8) and accelerator pedal position sensor 1 (pin 4 of C67) for a short to the battery power supply circuit or a short to the ignition power supply circuit. Is the result normal?

Refer to "RHD Engine Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "LHD Engine Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

2) Inspect 5 V reference circuit 7 between the ECM (pin 31 of E3) and the CKP sensor (pin 3 of E30) for a short to ground or a short to the low reference circuit. Is the result normal?

Refer to "RHD Engine Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "LHD Engine Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

3) Are all of the results normal?

Yes

=>Go to ECM replacement.

No

Repair the circuit as necessary.

=>Go to Repair verification.

7. ECM replacement

Note

  • Perform programming after replacing the ECM.

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) ECM removal".

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) ECM installation".

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) ECM setting".

Procedure completion

=>Go to Repair verification.

8. Repair verification

1) Clear the DTC with a scan tool.

2) Turn OFF the ignition switch for 1 minute 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.