| DTC P1659: | Electronic Throttle Control System (ETCS) Control Relay OFF Malfunction |
| 1. | Turn the ignition switch ON (II). |
| 2. | Clear the DTC with the HDS. |
| 3. | Check for Temporary DTCs or DTCs with the HDS. Is DTC P1659 indicated? YES - Go to 4. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ETCS control relay and the ECM/PCM.n |
| 4. | Turn the ignition switch OFF. |
| 5. | Check the No. 21 DBW (THROTTLE ACTUATOR CONTROL) (15 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES - Go to 6. NO - Go to 17. |
| 6. | Remove the ETCS control relay (A) from the under-hood fuse/relay box.
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| 7. | Test the ETCS control relay. Is the ETCS control relay OK? YES - Go to 8. NO - Replace the ETCS control relay, then go to 23. |
| 8. | Turn the ignition switch ON (II). |
| 9. | Measure voltage between ETCS control relay 4P connector terminal No. 1 and body ground.
Is there battery voltage? YES - Go to 10. NO - Replace the under-hood fuse/relay box, then go to 22. |
| 10. | Measure voltage between ETCS control relay 4P connector terminal No. 4 and body ground.
Is there battery voltage? YES - Go to 11. NO - Replace the under-hood fuse/relay box, then go to 22. |
| 11. | Turn the ignition switch OFF. |
| 12. | Jump the SCS line with the HDS. |
| 13. | Disconnect ECM/PCM connector C (44P). |
| 14. | Check for continuity between ETCS control relay 4P connector terminal No. 3 and ECM/PCM connector terminal C1.
Is there continuity? YES - Go to 15. NO - Repair open in the wire between the ECM/PCM (C1) and the ETCS control relay, then go to 23. |
| 15. | Disconnect ECM/PCM connector A (44P). |
| 16. | Check for continuity between ETCS control relay 4P connector terminal No. 2 and ECM/PCM connector terminal A20.
Is there continuity? YES - Go to 28. NO - Repair open in the wire between the ECM/PCM (A20) and the ETCS control relay, then go to 23. |
| 17. | Remove the ETCS control relay (A) from the under-hood fuse/relay box.
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| 18. | Jump the SCS line with the HDS. |
| 19. | Disconnect ECM/PCM connector C (44P). |
| 20. | Check for continuity between ECM/PCM connector terminal C1 and body ground.
Is there continuity? YES - Repair short in the wire between the ECM/PCM (C1) and the ETCS control relay, then go to 23. NO - Go to 21. |
| 21. | Check for continuity between ETCS control relay 4P connector terminal No. 4 and body ground.
Is there continuity? YES - Replace the under-hood fuse/relay box, then go to 23. NO - Go to 28. |
| 22. | Turn the ignition switch OFF. |
| 23. | Reconnect all connectors. |
| 24. | Turn the ignition switch ON (II). |
| 25. | Reset the ECM/PCM with the HDS. |
| 26. | Do the ECM/PCM idle learn procedure. |
| 27. | Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P1659 is indicated, check for poor connections or loose terminals at the ETCS control relay and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.n |
| 28. | Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM. |
| 29. | Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P1659 is indicated, check for poor connections or loose terminals at the ETCS control relay and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.n |