## DTC Troubleshooting: P0562 (34), P0563 (34)

DTC P0562: | ECM Power Source Circuit Low Voltage

1. | Turn the ignition switch ON (II).

2. | Do the DTC CLEAR in the CLEAR MENU with the HDS.

3. | Start the engine. Hold the engine speed at 3,000 rpm (min-1) with no load (in neutral) until the radiator fan comes on, then let it idle.

4. | Test-drive the vehicle for about 5 minutes. Try to keep the vehicle speed at the 50 km/h (31 mph).

5. | Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS. Is DTC P0562 and/or P0563 indicated? YES - Go to 6. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the PGM-FI main relays and the ECM.n

6. | Measure voltage at the battery terminals. Is there 8-16 V? YES - Go to 7. NO - Check the battery or alternator, then go to 18.

7. | Check the No. 20 (15A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES - Go to 14. NO - Go to 8.

8. | Turn the ignition switch OFF, and wait 10 seconds.

9. | Remove the driver's side under cover.

10. | Remove the relay holder (A) from the under-dash fuse/relay box, and remove the PGM-FI main relay 1 (brown) (B) from the relay holder (A), after reinstall the relay holder (A) to the under-dash fuse/relay box.

11. | Check for continuity between PGM-FI main relay 1 5P connector terminals No. 2 and body ground. Is there continuity? YES - Repair short in the wire between the No. 20 (15A) fuse and PGM-FI main relay 1, then go to 18. NO - Go to 12.

12. | Disconnect ECM connector No. 5 (9P).

13. | Check for continuity between PGM-FI main relay 1 5P connector terminals No. 1 and body ground. Is there continuity? YES - Repair short in the wire between the ECM connector No. 5 terminal No. 7 or No. 8 (test pin box terminal No. 128 or No. 129) and the PGM-FI main relay 1, then go to 18. NO - Go to 25.

14. | Turn the ignition switch OFF, and wait 10 seconds.

15. | Connect the ECM test harness and the test pin box between the ECM and connector.

16. | Measure voltage between body ground and the test pin box terminals No. 128 and No. 129 individually. Is there battery voltage? YES - Go to 25. NO - Go to 17.

17. | Check the PGM-FI main relay 1. Is it OK? YES - Repair open in the wire between the ECM connector No. 5 terminal No. 7, No. 8 (test pin box terminal No. 128, No. 129) and the PGM-FI main relay 1, then go to 18. NO - Replace the PGM-FI main relay 1, then go to 18.

18. | Reconnect all connectors.

19. | Turn the ignition switch ON (II).

20. | Do the ECM RESET in the CLEAR MENU with the HDS.

21. | Do the ETCS learn procedure.

22. | Start the engine. Hold the engine speed at 3,000 rpm (min-1) with no load (in neutral) until the radiator fan comes on, then let it idle.

23. | Test-drive the vehicle for about 5 minutes. Try to keep the vehicle speed at the 50 km/h (31 mph).

24. | Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS. Is DTC P0562 and/or P0563 indicated? YES - If DTC P0562 and/or P0563 is indicated, check for poor connections or loose terminals at the PGM-FI main relay 1 and the ECM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting. NO - Troubleshooting is complete.n

25. | Substitute a known-good ECM.

26. | Start the engine. Hold the engine speed at 3,000 rpm (min-1) with no load (in neutral) until the radiator fan comes on, then let it idle.

27. | Test-drive the vehicle for about 5 minutes. Try to keep the vehicle speed at the 50 km/h (31 mph).

28. | Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0562 and/or P0563 is indicated, check for poor connections or loose terminals at the PGM-FI main relay 1 and the ECM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting. NO - Replace the original ECM.n