Mazda 3 Workshop Manual page 294

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
DTC P0118
DETECTION
CONDITION
POSSIBLE CAUSE
Diagnostic procedure
Downloaded from
ECT sensor circuit high input
• The PCM monitors the ECT sensor signal at PCM terminal 2AK. If the PCM
detects the ECT sensor voltage is above 4.6 V, the PCM determines that the
ECT sensor circuit has malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition
during first drive cycle.
• PENDING CODE is available if the PCM detects the above malfunction
condition.
• FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.
• ECT sensor malfunction
• Open circuit in wiring harness between ECT sensor terminal A and PCM
terminal 2AK
• Short to power supply in wiring harness between ECT sensor terminal A
and PCM terminal 2AK
• Open circuit in wiring harness between ECT sensor terminal B and PCM
terminal 2AA
• Poor connection of ECT sensor or PCM connectors
• PCM malfunction
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