Mazda 3 Workshop Manual page 85

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
DETECTION
CONDITION
POSSIBLE CAUSE
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• The PCM monitors the ECT sensor signal at PCM terminal 2J. If the PCM
detects that the ECT sensor voltage is more than 4.9 V, the PCM
determines that the ECT sensor circuit has a malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition in
the 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
• Connector or terminal malfunction
• Open circuit in wiring harness between ECT sensor terminal A and PCM
terminal 2J
• Short to power supply in wiring harness between ECT sensor terminal A
and PCM terminal 2J
• Open circuit in wiring harness between ECT sensor terminal B and PCM
terminal 2AX
• PCM malfunction
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