DTC P1621 Control Module Long Term Memory Performance (4JJ3 with DPD)

1. Engine control system check

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) Diagnostic system check-engine controls".

2. Device connection check

1) Verify that all the tool connections are securely connected.

2) Verify that the programming device operates properly.

3) Connect the scan tool.

4) Turn OFF the ignition switch for 30 seconds or more.

5) Turn ON the ignition switch.

6) Observe the DTC information with a scan tool. Is a DTC set?

Yes

=>Go to Current DTC check.

No

=>Go to Repair verification.

3. Current DTC check

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 replacement.

No

=>Go to Repair verification.

4. ECM replacement

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) ECM removal".

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) ECM installation".

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) ECM setting".

Procedure completion

=>Go to Repair verification.

5. Repair verification

1) Clear the DTC with a scan tool.

2) Turn OFF the ignition switch for 1 minute or more.

3) Start the engine.

4) Observe the DTC information with a scan tool.