CM2150 Electronic Control System – 019-443   Aftertreatment Diesel Particulate Filter Differential Pressure Sensor

The aftertreatment diesel particulate filter differential pressure sensor measures pressure across the aftertreatment diesel particulate filter.

Due to the number of various differential pressure sensor mounting arrangements, this procedure has been written to be generic. Not all illustrations within this procedure will represent the application that is being worked on.

Turn the keyswitch ON (engine OFF) and connect it to the engine ECM with INSITE™ electronic service tool.

Use INSITE™ electronic service tool to monitor the aftertreatment diesel particulate differential pressure sensor value.

Look for a sensor drift condition 0 ± 1 kPa [0 ± 0.3 in Hg]. If the sensor value exceeds these specifications, it must be replaced.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

CAUTION  Do not allow the wire harness or electrical connectors to make contact with the outside of the aftertreatment canister. Contact with the outside or the canister can result in damage to the wire harness or connectors.

• Disconnect the batteries. Refer to the OEM service manual.
• Remove the differential pressure sensor tubes.

Use the following procedure in the ISB Series 6.7 Engines (CM2100 and CM2150 Common Rail Fuel Systems) Service Manual, Bulletin 4021578. Refer to Procedure 011-041 in Section 11.

Use the following procedure in the ISC and ISL CM2150 Service Manual, Bulletin 4021569. Refer to Procedure 011-041 in Section 11.

• Squeeze the locking tab and pull the connector apart to disconnect the pressure sensor wiring harness connector.

NOTE: On some applications, one of the flexible hoses will remain on the aftertreatment diesel particulate filter differential pressure sensor when it is removed. This hose is attached with a non-reusable clamp. Do not remove the non-reusable clamp.

Remove the two capscrews holding the aftertreatment diesel particulate filter differential pressure sensor from the differential pressure sensor mounting bracket.

Remove the differential pressure sensor with the L-shaped bracket and heat shield attached, if applicable.

Inspect the hoses for cuts or holes. Replace the hoses if damage is found.

Inspect the inside of the hoses for plugging or soot accumulation. If plugging or soot accumulation is observed, the tubes must be cleaned. Use one of the following procedures for cleaning instructions.

• Use the following procedure in the ISB Series 6.7L Engines (CM2100 and CM2150 Common Rail Fuel Systems) Service Manual, Bulletin 4021578. Refer to Procedure 011-041 in Section 11.
• Use the following procedure in the ISC and ISL CM2150 Service Manual, Bulletin 4021569. Refer to Procedure 011-041 in Section 11.

Inspect the differential pressure sensor electrical connector for damage.

Inspect the differential pressure sensor for cracks or body damage.

Replace the differential pressure sensor if damage is found.

Install the aftertreatment diesel particulate filter differential pressure sensor and the two mounting capscrews.

Tighten the two mounting capscrews.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

CAUTION  Do not allow the wire harness or electrical connectors to make contact with the outside of the aftertreatment canister. Contact with the outside or the canister can result in damage to the wire harness or connectors.

• Disconnect the pressure sensor wire harness connector.
• Install the differential pressure sensor tubes.

Use the following procedure in the ISB Series 6.7 Engines (CM2100 and CM2150 Common Rail Fuel Systems) Service Manual, Bulletin 4021578. Refer to Procedure 011-041 in Section 11.

Use the following procedure in the ISC and ISL CM2150 Service Manual, Bulletin 4021569. Refer to Procedure 011-041 in Section 11.

• Connect the batteries. Refer to the OEM service manual.