DTC Troubleshooting: P0117 (6)
DTC P0117:
 ECT Sensor 1 Circuit Low Voltage
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. Check ECT SENSOR 1 in the DATA LIST with the HDS.
Is about 180 °C (356 °F) or more, or 0.08 V or less indicated?
YES -
Go to Step 3 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the ECM.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the ECT sensor 1 2P connector.
  1. Turn the ignition switch to ON (II).
  1. Check ECT SENSOR 1 in the DATA LIST with the HDS.
Is about 180 °C (356 °F) or more, or 0.08 V or less indicated?
YES -
Go to Step 7 .
NO -
Go to Step 11 .
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM connector B (49P).
  1. Check for continuity between ECT sensor 1 2P connector terminal No. 1 and body ground.
Is there continuity?
YES -
Repair short in the wire between ECT sensor 1 and the ECM (B24), then go to Step 13 .
NO -
Go to Step 18 .
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect all connectors.
  1. Turn the ignition switch to ON (II).
  1. Reset the ECM with the HDS.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0117 indicated?
YES -
Check for poor connections or loose terminals at ECT sensor 1 and the ECM, then go to Step 1 .
NO -
Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■
  1. Reconnect all connectors.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0117 indicated?
YES -
Check for poor connections or loose terminals at ECT sensor 1 and the ECM. If the ECM was updated, substitute a known-good ECM, then recheck. If the ECM was substituted, go to Step 1 .
NO -
If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■