When foreign material such as an iron chip is on the CMP sensor, it can cause abnormal output from the sensor because of flux turbulence and adversely affect the engine control. Be sure there is no foreign material on the CMP sensor when replacing.
Note
Perform the following inspection only when directed.
Resistance Inspection
1. Disconnect the CMP sensor connector.
2. Measure the resistance between CMP sensor terminals A and B using an ohmmeter.
If not as specified, replace the CMP sensor.
If CMP sensor resistance is okay, perform the Circuit Open/Short Inspection.
Specification 400-550 ohms
Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION.)
2. Inspect the following wiring harnesses for open or short. (Continuity check)
Open circuit
If there is no continuity, the circuit is open. Repair or replace the harness.
- CMP sensor terminal A (harness-side) and PCM terminal 2M (harness-side)
- CMP sensor terminal B (harness-siede) and PCM terminal 2J (harness-side)
Short circuit
If there is continuity, the circuit is shorted. Repair or replace the harness.
- CMP sensor terminal A (harness-side) and power supply
- CMP sensor terminal A (harness-side) and body GND
- CMP sensor terminal B (harness-side) and power supply
- CMP sensor terminal B (harness-side) and body GND
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Test yourself
A quick Mazda 6 quiz: every answer comes with an explanation and a link to the manual page.
