Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
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• The PCM monitors input voltage from CMP sensor when engine is running.
If the PCM does not receive input voltage from CMP sensor while the PCM
receives input signal from CKP sensor, PCM determines that CMP 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.
• DTC is stored in the PCM memory.
• CMP sensor malfunction
• Connector or terminal malfunction
• CMP sensor is dirty
• Short to power supply in wiring harness between CMP sensor terminal A
and PCM terminal 2V
• Short to power supply in wiring harness between CMP sensor terminal B
and PCM terminal 2U
• Short to ground in wiring harness between CMP sensor terminal A and
PCM terminal 2V
• Short to ground in wiring harness between CMP sensor terminal B and
PCM terminal 2U
• Open circuit in wiring harness between CMP sensor terminal A and PCM
terminal 2V
• Open circuit in wiring harness between CMP sensor terminal B and PCM
terminal 2U
• CKP sensor pulse wheel malfunction
• Both CMP sensor wires are shorted each other
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