Note
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 DTC P0122 or P0123 set at the same time?
Yes
Go to the applicable DTC diagnosis.
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0122 (Flash Code 43) Throttle Position Sensor Circuit Low".
No
=>Go to Intake throttle valve operation check.
1) Perform the Intake Throttle Valve with a scan tool.
2) While observing the Desired Intake Throttle Valve Position parameter and Intake Throttle Valve Position parameter on the scan tool, command the intake throttle valve INCREASE/DECREASE. Is the difference between the Desired Intake Throttle Valve Position parameter and the Intake Throttle Valve Position parameter within the specified range?
Note
Value: -5 to 5 %
Yes
Go to Intermittent conditions of engine.
Refer to "202.Engine 15D.Symptom(RZ4E-TC) intermittent conditions of engine".
No
=>Go to Intake throttle valve inspection.
1) Remove the intake air duct from the intake throttle valve.
2) Inspect the intake throttle valve for the following. Is the result normal?
Note
Yes
=>Go to Intake throttle valve circuit inspection.
No
Repair or replace as necessary.
=>Go to Intake throttle valve operation signal input inspection.
1) Inspect for poor connections at the intake throttle valve harness connector (pins 2, 3, 4, 5, and 6 of E25). Is the connection status normal?
2) Inspect for poor connections at the ECM harness connector (pins 4, 14, 23, 28, and 31 of E4). Is the connection status normal?
3) Inspect the circuit between the ECM (pins 4, 14, 23, 28, and 31 of E4) and the intake throttle valve (pins 2, 3, 4, 5, and 6 of E25) for 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.).
4) Are all of the results normal?
Yes
=>Go to Inspection for open circuit and short circuit in intake throttle motor circuit.
No
Repair the circuit or connection as necessary.
=>Go to Intake throttle valve operation signal input inspection.
1) Inspect the motor circuit between the ECM (pins 23 and 31 of E4) and the intake throttle valve (pins 5 and 6 of E25) 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
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
Repair the circuit as necessary.
=>Go to Intake throttle valve operation signal input inspection.
1) Reconnect all of the disconnected harness connectors.
2) Clear the DTC with a scan tool.
3) Turn OFF the ignition switch for 30 seconds 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. Is a DTC set?
Yes
No
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.