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 2 minutes or more.
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: 130 ℃ { 266 °F }
Yes
=>Go to CAC temperature sensor signal output 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).
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.).
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
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 Inspection for short to ground 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 the following. 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 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.