DTC P1655 (Flash Code 59) Sensor Reference Voltage 4 Circuit (RZ4E-TC)

1. Engine control system check

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

2. Current DTC check

1) Connect the scan tool.

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

3) Start the engine.

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

Yes

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

No

Go to Intermittent conditions of engine.

Refer to "202.Engine 15D.Symptom(RZ4E-TC) intermittent conditions of engine".

3. CKP sensor 5 V reference voltage check

1) Turn OFF the ignition switch.

2) Disconnect the CKP sensor harness connector (E54).

3) Turn ON the ignition switch.

4) Measure the voltage between the CKP sensor 5 V reference circuit (pin 3 of E54) and the body ground with a DMM.

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.).

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 CKP sensor.

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

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

=>Go to Repair verification.

The reading is less than the specified value.

=>Go to EGR position sensor 5 V reference voltage check.

4. EGR position sensor 5 V reference voltage check

1) Turn OFF the ignition switch.

2) Disconnect the EGR valve harness connector (E49).

3) Turn ON the ignition switch.

4) Measure the voltage between the CKP sensor 5 V reference circuit (pin 3 of E54) and the body ground with a DMM. Is the voltage more than or equal to the specified value?

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.).

Value: 4.5 V

Yes

Replace the EGR valve.

Refer to "1.Engine 1H.Aux. Emission Control Devices(RZ4E-TC) EGR removal".

Refer to "1.Engine 1H.Aux. Emission Control Devices(RZ4E-TC) EGR installation".

=>Go to Repair verification.

No

=>Go to Boost pressure sensor 5 V reference voltage check.

5. Boost pressure sensor 5 V reference voltage check

1) Turn OFF the ignition switch.

2) Disconnect the boost pressure and CAC temperature sensor harness connector (E51).

3) Turn ON the ignition switch.

4) Measure the voltage between the CKP sensor 5 V reference circuit (pin 3 of E54) and the body ground with a DMM. Is the voltage more than or equal to the specified value?

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.).

Value: 4.5 V

Yes

Replace the boost pressure and CAC temperature sensor.

Refer to "1.Engine 1Z.Engine Electrical Control(RZ4E-TC) boost pressure and CAC temperature sensor removal".

Refer to "1.Engine 1Z.Engine Electrical Control(RZ4E-TC) boost pressure and CAC temperature sensor installation".

=>Go to Repair verification.

No

=>Go to Intake throttle position sensor 5 V reference voltage check.

6. Intake throttle position sensor 5 V reference voltage check

1) Turn OFF the ignition switch.

2) Disconnect the intake throttle valve harness connector (E25).

3) Turn ON the ignition switch.

4) Measure the voltage between the CKP sensor 5 V reference circuit (pin 3 of E54) and the body ground with a DMM. Is the voltage more than or equal to the specified value?

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.).

Value: 4.5 V

Yes

Replace the intake throttle valve.

Refer to "1.Engine 1B.Mechanical(RZ4E-TC) Intake throttle valve removal".

Refer to "1.Engine 1B.Mechanical(RZ4E-TC) Intake throttle valve installation".

=>Go to Repair verification.

No

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

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

1) Inspect 5 V reference circuit 4 between the ECM (pin 14 of E4) and the following components for a short to ground or a short to the low reference circuit. Is the result normal?

  • CKP sensor (pin 3 of E54)

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.).

  • EGR position sensor (pin 1 of E49)

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.).

  • Boost pressure sensor (pin 3 of E51)

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.).

  • Intake throttle position sensor (pin 2 of E25)

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) Are all of the results normal?

Yes

=>Go to ECM replacement.

No

Repair the circuit as necessary.

=>Go to Repair verification.

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

1) Inspect 5 V reference circuit 4 between the ECM (pin 14 of E4) and the following components for a short to the battery power supply circuit or a short to the ignition power supply circuit. Is the result normal?

  • CKP sensor (pin 3 of E54)

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.).

  • EGR position sensor (pin 1 of E49)

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.).

  • Boost pressure sensor (pin 3 of E51)

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.).

  • Intake throttle position sensor (pin 2 of E25)

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) Are all of the results normal?

Yes

=>Go to ECM replacement.

No

Repair the circuit as necessary.

=>Go to Repair verification.

9. ECM replacement

Note

  • Perform programming after replacing the ECM.

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.

10. 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.