Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) Diagnostic system check-engine controls".
1) Turn OFF the ignition switch for 2 minutes or more.
2) Connect the scan tool.
3) Observe the Intake Manifold Temperature parameter on the scan tool. Is the Intake Manifold Temperature parameter more than or equal to the specified value?
Value: -40 ℃ { -40 °F }
Yes
=>Go to CAC temperature sensor signal output 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 boost pressure and CAC temperature sensor harness connector (E51).
3) Turn ON the ignition switch.
4) Measure the voltage between the CAC temperature sensor signal circuit (pin 4 of E51) 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: 5.5 V
Yes
=>Go to Inspection for short to power supply in CAC temperature sensor signal circuit.
No
=>Go to CAC temperature sensor circuit check.
1) Inspect the CAC temperature sensor signal circuit between the ECM (pin 12 of E4) and the boost pressure and CAC temperature sensor (pin 4 of E51) for a short to the battery power supply circuit or a short to the ignition power supply circuit. Is the result normal?
Note
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
No
Repair the circuit as necessary.
1) Connect a fused jumper wire between the CAC temperature sensor signal circuit and the low reference circuit (pins 2 and 4 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.).
2) Observe the Intake Manifold Temperature parameter on the scan tool. Is the Intake Manifold Temperature parameter more than or equal to the specified value?
Value: 130 ℃ { 266 °F }
Yes
=>Go to Inspection for short to 5 V reference in CAC temperature sensor signal circuit.
No
=>Go to CAC temperature sensor signal circuit check.
1) Connect a fused jumper wire between the CAC temperature sensor signal circuit (pin 4 of E51) 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) Observe the Intake Manifold Temperature parameter on the scan tool. Is the Intake Manifold Temperature parameter more than or equal to the specified value?
Value: 130 ℃ { 266 °F }
Yes
=>Go to Inspection for open circuit in CAC temperature sensor low reference circuit.
No
=>Go to Inspection for open circuit in CAC temperature sensor signal circuit.
1) Inspect the CAC temperature sensor signal circuit between the ECM (pin 12 of E4) and the boost pressure and CAC temperature sensor (pin 4 of E51) for an open circuit or high resistance. 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 harness connector inspection.
No
Repair the circuit as necessary.
1) Inspect the CAC temperature sensor low reference circuit between the ECM (pin 28 of E4) and the boost pressure and CAC temperature sensor (pin 2 of E51) for an open circuit or high resistance. 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 harness connector inspection.
No
Repair the circuit as necessary.
1) Inspect the CAC temperature sensor signal circuit between the ECM (pin 12 of E4) and the boost pressure and CAC temperature sensor (pin 4 of E51) for a short to the 5 V 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.).
Yes
=>Go to Boost pressure and CAC temperature sensor harness connector inspection.
No
Repair the circuit as necessary.
1) Inspect for poor connections at the boost pressure and CAC temperature sensor harness connector (pins 2 and 4 of E51). Is the connection status 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
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
Repair the connections as necessary.
1) Inspect for poor connections at the ECM harness connector (pins 12 and 28 of E4). Is the connection status 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
No
Repair the connections 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) Connect all of the disconnected harness connectors.
2) Clear the DTC with a scan tool.
3) Turn OFF the ignition switch for 2 minutes or more.
4) Start the engine.
5) Operate the vehicle under the conditions for running the DTC.
6) Observe the DTC information with a scan tool.