( TF09EABK72100090118FAAT00 )
DTC Troubleshooting: P0118 (6)
DTC P0118:
 ECT Sensor 1 Circuit High 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 −40 °C (−40 °F) or less, or 4.90 V or higher 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/PCM.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the ECT sensor 1 2P connector.
  1. Connect ECT sensor 1 2P connector terminals No. 1 and No. 2 with a jumper wire.
  1. Turn the ignition switch to ON (II).
  1. Check ECT SENSOR 1 in the DATA LIST with the HDS.
Is about −40 °C (−40 °F) or less, or 4.90 V or higher indicated?
YES -
Go to Step 8 .
NO -
Go to Step 20 .
  1. Turn the ignition switch to LOCK (0).
  1. Remove the jumper wire from ECT sensor 1 2P connector.
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between ECT sensor 1 2P connector terminal No. 1 and body ground.
Is there about 5 V?
YES -
Go to Step 12 .
NO -
Go to Step 16 .
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM/PCM connector B (49P).
  1. Check for continuity between ECT sensor 1 2P connector terminal No. 2 and ECM/PCM connector terminal B34.
Is there continuity?
YES -
Go to Step 27 .
NO -
Repair open in the wire between the ECM/PCM (B34) and ECT sensor 1, then go to Step 22 .
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM/PCM connector B (49P).
  1. Check for continuity between ECT sensor 1 2P connector terminal No. 1 and ECM/PCM connector terminal B24.
Is there continuity?
YES -
Go to Step 27 .
NO -
Repair open in the wire between the ECM/PCM (B24) and ECT sensor 1, then go to Step 22 .
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect all connectors.
  1. Turn the ignition switch to ON (II).
  1. Reset the ECM/PCM with the HDS.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0118 indicated?
YES -
Check for poor connections or loose terminals at ECT sensor 1 and the ECM/PCM, 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 P0118 indicated?
YES -
Check for poor connections or loose terminals at ECT sensor 1 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.■