Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) Diagnostic system check-engine controls".
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".
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".
The reading is less than the specified value.
=>Go to 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".
No
=>Go to 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".
No
=>Go to 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".
No
=>Go to 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?
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.).
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.).
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.).
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
No
Repair the circuit as necessary.
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?
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.).
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.).
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.).
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
No
Repair the circuit as necessary.
Note
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
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.