DIESEL PARTICULATE FILTER DIFFERENTIAL PRESSURE SENSOR INSPECTION[MZ-CD 1.6 (Y6)]

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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.

Note

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

Using a hand vacuum pump or pressure pump, apply 300 hPa of pressure to the front pressure line. Does the differential pressure sensor on the M-MDS read 300 hPa?

― YES : Install a new diesel particulate filter.

― NO : Install a new diesel particulate filter differential pressure sensor.

Visual Inspection

1. Remove the diesel particulate filter differential pressure sensor. (See DIESEL PARTICULATE FILTER DIFFERENTIAL PRESSURE SENSOR REMOVAL/INSTALLATION[MZ-CD 1.6 (Y6)].)

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

3. Visually inspect the diesel particulate filter differential pressure sensor for the following:

• Damage

• Cracks

• Rusted sensor terminal

• Bent sensor terminal

― If there is any malfunction, replace the diesel particulate filter differential pressure sensor.

4. Install the diesel particulate filter differential pressure sensor. (See DIESEL PARTICULATE FILTER DIFFERENTIAL PRESSURE SENSOR REMOVAL/INSTALLATION[MZ-CD 1.6 (Y6)].)

Voltage Inspection

1. Disconnect the hoses connected to the diesel particulate filter differential pressure sensor ports A and B.

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2. Turn the engine switch to the ON position (Engine off).

3. Verify that the terminal voltage at diesel particulate filter differential pressure sensor terminal C is within the specification.

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• If not within the specification, replace the diesel particulate filter differential pressure sensor. (See DIESEL PARTICULATE FILTER DIFFERENTIAL PRESSURE SENSOR REMOVAL/INSTALLATION[MZ-CD 1.6 (Y6)].)

Diesel particulate filter differential pressure sensor signal voltage (reference)

Approx. 0.21—0.79 V

4. Verify that the change in voltage at diesel particulate filter differential pressure sensor terminal C is within the specification when a pressure of 30 kPa {225 mmHg, 8.85 inHg} is applied to the diesel particulate filter differential pressure sensor.

• If it is not as specified, “Circuit Open/Short Inspection”.

― If there is no open/short circuit, replace the diesel particulate filter differential pressure sensor.

Diesel particulate filter differential pressure sensor terminal voltage variance (reference)

Approx. 1. 73—2.47 V

Circuit Open/Short Inspection

1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION[MZ-CD 1.6 (Y6)].)

2. Inspect the following wiring harness for an open or short circuit. (Continuity check)

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Open circuit

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

― Diesel particulate filter differential pressure sensor terminal A and PCM terminal 207

― Diesel particulate filter differential pressure sensor terminal B and PCM terminal 119

― Diesel particulate filter differential pressure sensor terminal C and PCM terminal 246

Short circuit

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

― Diesel particulate filter differential pressure sensor terminal A and power supply

― Diesel particulate filter differential pressure sensor terminal A and body ground

― Diesel particulate filter differential pressure sensor terminal B and power supply

― Diesel particulate filter differential pressure sensor terminal B and body ground

― Diesel particulate filter differential pressure sensor terminal C and power supply

― Diesel particulate filter differential pressure sensor terminal C and body ground