DTC Troubleshooting: P1659 (40)
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.
  1. Turn the ignition switch to ON (II).
  1. Clear the DTC with the HDS.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P1659 indicated?
YES -
Go to Step 4 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the under-hood fuse/relay box and the ECM.■
  1. Turn the ignition switch to LOCK (0).
  1. Check the No. 8 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 13 .
  1. Test the ETCS control relay in the under-hood fuse/relay box.
Is the relay OK?
YES -
Go to Step 7 .
NO -
Replace the under-hood fuse/relay box, then go to Step 21 .
  1. Jump the SCS line with the HDS.
  1. Disconnect under-hood fuse/relay box (white) connector D (20P).
  1. Disconnect ECM connector C (49P).
  1. Check for continuity between under-hood fuse/relay box connector D (20P) terminal No. 6 and ECM connector terminal C1.
Is there continuity?
YES -
Go to Step 11 .
NO -
Repair open in the wire between the ECM (C1) and the under-hood fuse/relay box, then go to Step 21 .
  1. Disconnect ECM connector A (49P).