DTC P0118: Notes

2006 Mazda 6 i, 4D Sedan, AutomaticSECTION Notes
DTC P0118 DETECTION CONDITION AND POSSIBLE CAUSES

DTC P0118 ECT circuit high input
DETECTION CONDITION 
  • The PCM monitors ECT sensor signal. If the PCM detected ECT sensor voltage above 4.58 V  , the PCM determines that the ECT sensor circuit has malfunction.

Diagnostic support note 
  • This is a continuous monitor (Engine cooling system).
  • MIL illuminates if PCM detects the above malfunction condition during first drive cycle.
  • PENDING CODE is available if PCM detects the above malfunction condition.
  • FREEZE FRAME DATA is available.
  • DTC is stored in the PCM memory.
POSSIBLE CAUSE 
  • ECT sensor malfunction
  • Open circuit between ECT sensor terminal A and PCM terminal 2AH
  • Short to power supply between ECT sensor terminal A and PCM terminal 2AH
  • Open circuit between ECT sensor terminal B and PCM terminal 2AY
  • Poor connection of ECT sensor or PCM connectors
  • PCM malfunction
G04324013Courtesy of MAZDA MOTORS CORP.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.