CAMSHAFT POSITION (CMP) SENSOR INSPECTION[AJ (3.0L Duratec)]

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Note

•  Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart. (See HOW TO USE THIS MANUAL.)

Visual Inspection

1.  Remove the CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION[AJ (3.0L Duratec)].)

2.  Verify that there are no metal shavings on the CMP sensor.

3.  Install the CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION[AJ (3.0L Duratec)].)

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 CMP sensor voltage using a oscilloscope.

•  If not within the specification, replace the CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION[AJ (3.0L Duratec)].)

•  If the monitor item status/specification (reference) is not within the specification, even though the resistance is within the specification, perform the “Circuit Open/Short Inspection”.

Measurement condition

•  Connection terminals: 85(+) — GND(–)

•  Instrument setting: DC range

•  Measurement condition: cranking while circuit opening relay is disconnected.

CMP sensor output voltage

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Circuit Open/Short Inspection

1.  Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION[AJ (3.0L Duratec)].)

2.  Inspect the following wiring harness for open or short (continuity check).

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Open circuit

•  If there is no continuity, the circuit is open. Repair or replace the harness.

―  CMP sensor terminal A and PCM terminal 85

―  CMP sensor terminal B and PCM terminal 3

Short circuit

•  If there is continuity, the circuit is shorted. Repair or replace the harness.

―  CMP sensor terminal A and power supply

―  CMP sensor terminal A and body ground

―  CMP sensor terminal B and power supply