DTC P0118: ECT Sensor Circuit High Input

Fig 1: DTC P0118 Detection Condition & Possible Causes Chart

Courtesy of MAZDA MOTORS CORP.

Diagnostic Procedure 

Fig 2: DTC P0118 Diagnostic Procedure Chart (Step 1-3)

Courtesy of MAZDA MOTORS CORP.

Fig 3: DTC P0118 Diagnostic Procedure Chart (Step 4-9)

Courtesy of MAZDA MOTORS CORP.