Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) Diagnostic system check-engine controls".
1) Connect the scan tool.
2) Turn OFF the ignition switch for 1 minute or more.
3) Turn ON the ignition switch.
4) Observe the DTC information with a scan tool. Is a DTC set?
Yes
=>Go to ECM main relay inspection.
No
Go to Intermittent conditions of engine.
Refer to "202.Engine 15D.Symptom(4JJ3 without DPD) intermittent conditions of engine".
1) Turn OFF the ignition switch for 1 minute or more.
2) Replace the ECM main relay with a known good relay.
3) Turn ON the ignition switch.
4) Observe the DTC information with a scan tool. Is a DTC set?
Yes
No
Replace the ECM main relay.
1) Inspect for a blown out ECM 40A slow blow fuse. Is the result normal?
Yes
=>Go to ECM main relay circuit inspection.
No
Replace the ECM 40A slow blow fuse. If the slow blow fuse blows out again, repair the short to ground in the circuits relating to the ECM 40A slow blow fuse.
1) Inspect for poor connections at the ECM harness connector (pins 2, 3, 4, 5, and 6 of C9). Is the connection status normal?
2) Inspect each relay circuit for an open circuit or high resistance for the following. Is the result normal?
Refer to "LHD Engine Control (4JJ3 without DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Engine Control (4JJ3 without DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).
3) Are all of the results normal?
Yes
No
Repair the circuit or connection as necessary.
Note
Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 without DPD) ECM removal".
Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 without DPD) ECM installation".
Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 without DPD) ECM setting".
Procedure completion
1) Clear the DTC with a scan tool.
2) Turn OFF the ignition switch for 1 minute or more.
3) Turn ON the ignition switch.
4) Operate the vehicle under the conditions for running the DTC.
5) Observe the DTC information with a scan tool.