CM871 and CM876 Electronic Control Systems, ISX and ISM Engines – 019-050   Fuel Shutoff Valve

Make sure the shutoff valve coil is the correct voltage (12 or 24 VDC).

The coil voltage and part number are cast into the terminal connection end of the coil.

Remove the fuel shutoff valve signal wire.

Use the multimeter meter to check the coil resistance.

NOTE: If the solenoid shows 0 ohms, there is an electrical short in the coil.

If the coil resistance is correct, the assembly of the valve must be checked. If the coil resistance does not meet specification, the coil must be replaced.

Install the fuel shutoff valve signal wire after completing the repair.

Make sure the shutoff valve coil is the correct voltage (12 or 24 VDC).

The coil voltage and part number are cast into the terminal connection end of the coil.

Turn the keyswitch to the ON position.

Use a multimeter to check the voltage to the coil.

The voltage must be the same as the battery voltage.

Turn the keyswitch to the OFF position.

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.

Disconnect the batteries. Refer to Procedure 013-009 in the ISM, ISMe and QSM11 Service Manual, Bulletin 3666322, or the Signature, ISX and QSX15 Service Manual, Bulletin 3666239.

Clean the fuel shutoff valve and surrounding area.

Disconnect the fuel shutoff valve signal wire from the engine harness.

Remove the mounting capscrews.

Remove the fuel shutoff valve.

NOTE: The fuel shutoff solenoid is in the middle of the front and rear timing actuators.

Clean the fuel shutoff valve and surrounding area.

Disconnect the fuel shutoff valve signal wire from the engine harness.

Remove the mounting capscrews.

Remove the fuel shutoff valve.

Install a new o-ring on the fuel shutoff valve.

Install the fuel shutoff valve and the capscrews.

Connect the fuel shutoff valve to the engine harness.

Install a new o-ring on the solenoid.

Install the solenoid and the capscrews.

Tighten the capscrews.

Connect the fuel shutoff valve to the engine harness.

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.

Connect the batteries. Refer to Procedure 013-009 in the ISM, ISMe and QSM11 Service Manual, Bulletin 3666322, or the Signature, ISX and QSX15 Service Manual, Bulletin 3666239.