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DTC P1659: Electronic Throttle Control System (ETCS) Control Relay OFF Malfunction

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Check for Temporary DTCs or DTCs with the HDS.
Is DTC P1659 indicated?

Yes - Go to step 4.

NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ETCS control relay (F) and the ECM/PCM.

Turn the ignition switch OFF.
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 step 6.

NO - Go to step 17.

Remove the ETCS control relay (F) (A) from the under-hood fuse/relay box.
Test the ETCS control relay.
Is the ETCS control relay (F) OK?

Yes - Go to step 8.

NO - Replace the ETCS control relay (F), then go to step 23.

Turn the ignition switch ON (II).

Measure voltage between ETCS control relay (F) 4P connector terminal No. 1 and body ground.
Is there battery voltage?

Yes - Go to step 10.

NO - Replace the under-hood fuse/relay box, then go to step 23.

Measure voltage between ETCS control relay (F) 4P connector terminal No. 4 and body ground.
Is there battery voltage?

Yes - Go to step 11.

NO - Replace the under-hood fuse/relay box, then go to step 22.

Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector C (44P).

Check for continuity between ETCS control relay (F) 4P connector terminal No. 3 and ECM/PCM connector terminal C1.
Is there continuity?

Yes - Go to step 15.

NO - Repair open in the wire between the ECM/PCM (C1) and the ETCS control relay (F), then go to step 23.

Disconnect ECM/PCM connector A (44P).

Check for continuity between ETCS control relay (F) 4P connector terminal No. 2 and ECM/PCM connector terminal A20.
Is there continuity?

Yes - Go to step 28.

NO - Repair open in the wire between the ECM/PCM (A20) and the ETCS control relay (F), then go to step 23.

Remove the ETCS control relay (F) (A) from the under-hood fuse/relay box.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector C (44P).

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 (F), then go to step 23.

NO - Go to step 21.

Check for continuity between ETCS control relay (F) 4P connector terminal No. 4 and body ground.
Is there continuity?

Yes - Replace the under-hood fuse/relay box, then go to step 23.

NO - Go to step 28.

Turn the ignition switch OFF.
Reconnect all connectors.
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure.
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 (F) and the ECM/PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

NO - Troubleshooting is complete.

Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
Check for Temporary DTCs or DTCs with the HDS.
Is DTC P1659 indicated?

Yes - Check for poor connections or loose terminals at the ETCS control relay (F) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then recheck. If the ECM/PCM was substituted, go to step 1.

NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.