CAMSHAFT POSITION (CMP) SENSOR INSPECTION [MZR-CD (RF Turbo)]

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Note
•  Perform the following test only when directed.
Caution
•  When foreign material, such as iron chips, gets on the CMP sensor, it can cause abnormal output from the sensor because of flux turbulence and adversely affect engine control. Be sure there is no foreign material on the CMP sensor when replacing.
•  Do not forcefully pull the wiring harness of the CMP sensor. Doing so will break the harness.

Visual Inspection

1.  Verify that the CMP sensor and the pulsar are free of any metallic shavings or particles.

•  If any are found on the CMP sensor and the pulsar, clean them off.


Voltage inspection

1.  Idle the engine.

Caution
•  Water penetrating the connector will cause sensor malfunction. To prevent this, be careful not to damage the wiring harnesses or the waterproof connector so as to cause water penetration.

2.  Measure the output voltage using a oscilloscope.

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•  If not within the specification, replace the CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)

CMP sensor voltage

Terminal

Voltage (V)

Condition
A
5
Under any condition
B
0
Under any condition
C
4.0 or more
High output
1.0 or less
Low output


Circuit Open/Short Inspection

1.  Inspect for open/short circuit in the following wiring harnesses.

•  if there is open/short circuit, repair or replace wiring harnesses.

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Open circuit

•  CMP sensor terminal A and PCM terminal 64
•  CMP sensor terminal B and PCM terminal 66
•  CMP sensor terminal C and PCM terminal 47


Short circuit

•  CMP sensor terminal A and power supply
•  CMP sensor terminal A and body ground
•  CMP sensor terminal B and power supply
•  CMP sensor terminal C and power supply
•  CMP sensor terminal C and body ground