To reduce the possibility of connector damage, do not use probes or leads other than Part Number 3822758. The leads must fit tightly in the connector without expanding the pins in the connector.
Inspect the injector solenoid circuit of the cylinder referenced on the recorded fault code. Refer to the chart at the beginning of this section for the pins of the injector circuit of the problem cylinder. Cylinder number 1 will be used in this example. Place the test lead into the supply pin (pin 1 in this example) of the actuator harness.
Place the other test lead pin into the return pin (pin 10 in this example)
of the actuator harness. Connect the alligator clips to the multimeter probes.
Measure the resistance. Subtract the multimeter test lead resistance value from this value to determine the true injector circuit resistance value. The resistance
must be 0.5 to 1.5 ohms. If the resistance value is
not correct, proceed with the following sections. If the resistance is correct, the circuit
must still be checked for a short circuit to ground and a short circuit from pin to pin. (See Resistance Value within Specification.)
NOTE: If the resistance measurement is less than 10 ohms, the circuit is acceptable as long as the resistance of the injector solenoid is within 0.5 to 1.5 ohms.
(See Resistance Value Above Specification.)
Measure the resistance between the two posts or the connection of the injector solenoid. Subtract the multimeter resistance. The true injector solenoid resistance
must be 0.5 to 1.5 ohms. If the resistance value is
not correct, replace the injector. Refer to Procedure
006-026 in the Troubleshooting and Repair Manual, M11 Series Engines (STC, CELECT™, and CELECT™ Plus models), Bulletin
If the resistance value of the injector solenoid is correct, the problem is in the internal or external actuator harness. Isolate the problem by checking each harness separately.
Check the internal actuator harness. Measure the resistance between the two captive nut assemblies, or the connection, of the injector solenoid wire that was removed from the injector solenoid. The resistance
must be an open circuit (more than 100k ohms). If the resistance is less than 100k ohms, replace the internal actuator wiring harness. Refer to Procedure
Check the external actuator harness. Make sure that the 12-pin connector is still disconnected. Place the pin of the test lead into the supply pin
(pin 1 in this example) of the actuator harness. Place the pin of the other test lead into the return pin (pin 10 in this example) of the actuator harness. Connect the alligator clips to the multimeter probes.
must be an open circuit (more than 100k ohms). If the resistance is less than 100k ohms, repair or replace the external actuator harness. Refer to Procedure
Measure the resistance between the posts or the connection of the injector solenoid. Subtract the multimeter resistance. The true injector solenoid resistance
must be 0.5 to 1.5 ohms. If the resistance is
not correct, replace the injector. Refer to Procedure
006-026 in the Troubleshooting and Repair Manual, M11 Series Engines
(STC, CELECT™, and CELECT™ Plus models), Bulletin
To reduce the possibility of connector damage, do not use probes or leads other than the mating connector. The leads must fit tightly in the connector without expanding the pins in the connector.
Connect a mating connector with short lead extensions to the injector side of the 2-pin connector.
Touch one multimeter probe to the end of the short lead extension. Touch the other multimeter probe to the captive nut assembly of the injector solenoid wire. Measure the resistance. Repeat the procedure for the other injector wire. The resistance for both of these checks
must be less than 10 ohms. If the resistance is more than 10 ohms, replace the injector solenoid wires. Refer to Procedure
Check the internal actuator harness for an open circuit. Use a Torx®
(six point star) screwdriver (size T-25) to remove the screw and disconnect the 12-pin connector to separate the internal and external actuator harnesses.
Refer to the chart at the beginning of this section for the pins of the injector circuit of the problem cylinder.
Cylinder number 1 will be used in this example. Check the supply wire. Touch one multimeter probe on the supply pin (pin A) at the injector 2-pin connector, internal actuator harness side.
Touch the other multimeter probe on the supply pin (pin A) at the 12-pin connector, internal actuator harness side. Measure the resistance. The resistance
must be less than 10 ohms. If more than 10 ohms are measured, replace the internal actuator harness. Refer to Procedure
Check the return wire for an open circuit. Touch one multimeter probe to the return pin (pin B) at the injector 2-pin connector, internal actuator harness side. Touch the other multimeter probe on the return pin (pin B) of the 12-pin connector, internal actuator harness side.
Check the external actuator harness for an open circuit. Refer to the chart at the beginning of this section for the pins required.
Cylinder number 1 will be used as an example. Insert a test lead into the supply pin (pin 1 in this example) of the actuator harness. Connect the alligator clip to the multimeter probe.
Place the other multimeter probe on the supply pin (pin A) at the 12-pin connector, external actuator harness side. Measure the resistance. The resistance
must be less than 10 ohms. If more than 10 ohms are measured, repair the wire or replace the actuator harness. Refer to Procedure
Insert a test lead in the return pin (pin 10 in this example) of the actuator harness. Place the other multimeter probe on the return pin (pin B) at the 12-pin connector, external harness side.
To reduce the possibility of connector damage, do not use probes or leads other than Part Number 3822758. The leads must fit tightly in the connector without expanding the pins in the connector.
Inspect the injector solenoid circuit of the cylinder referenced on the recorded fault code. Refer to the chart at the beginning of this section for the pin numbers of the injector circuit of the problem cylinder. Cylinder number 1 will be used in this example.
Place a test lead into the supply pin (pin 1 in this example) of the actuator harness. Place the other test lead into the return pin (pin 10 in this example) of the actuator harness. Connect the alligator clips to the multimeter probes.
Measure the resistance. Subtract the multimeter test lead resistance value from this value to determine the true injector circuit resistance value. The resistance
must be 0.5 to 1.5 ohms. If the resistance value is
not correct, proceed with the following sections (Resistance Value below Specification and Resistance Value above Specification). If the resistance is correct, the circuit
must still be checked for a short circuit to ground and a short circuit from pin to pin. Refer to Resistance Value within Specification in this section.
NOTE: If the resistance measurement is less than 10 ohms, the circuit is acceptable as long as the resistance of the injector solenoid is within 0.5 to 1.5 ohms.
(See Resistance Value Above Specification.)
Touch the multimeter probes to the two pins of the pass-through connector. Measure the resistance. Subtract from this value the multimeter resistance value to determine the true injector circuit resistance value. The resistance
must be 0.5 to 1.5 ohms.
If the resistance value is
not correct, the problem is in the pass-through connector, the injector solenoid wires, or the injector solenoid. Proceed as follows.
If the resistance value is correct, then remove the valve cover of the problem cylinder to check the injector solenoid wires and the injector solenoid.
Check the actuator harness. Make sure that the 2-pin connector is still disconnected from the pass-through. Place a test lead into the supply pin
(pin 1 in this example) of the actuator harness. Place the other test lead into the return pin (pin 10 in this example) of the actuator harness. Connect the alligator clips to the multimeter probes.
Again, refer to the chart at the beginning of this section for the pin numbers of the injector circuit on the problem cylinder.
After completing the repair, connect the 2-pin connector t the pass-through connector, connect the AMP connector to the ECM, and install the valve cover.
Check the pass-through connector at the rocker box housing of the problem cylinder for proper connection. Make sure that the 2-pin Deutsch connector is snapped into the pass-through.
Touch the multimeter probes to each pin of the pass-through connector. Measure the resistance. Subtract from this value the multimeter resistance value to determine the true injector circuit resistance value. The resistance
must be 0.5 to 1.5 ohms. If the resistance value is
not
correct, there is an open circuit in the injector solenoid wires or the injector solenoid. Proceed as follows.
Check the 2-pin connector of the injector solenoid wires for a proper connection to the pass-through. Make sure the connector is “snapped” into the pass-through.
Touch the multimeter probes to the inner pins of the pass-through (1). Touch the multimeter probes to the outer pins of the pass-through (2). The resistance value for each of these checks
must be less than 10 ohms (closed circuit). If the resistance value is
not correct, replace the pass-through connector. Refer to Procedure
Use a small screwdriver to remove the protective cover from the solenoid.
Use inch-pound torque wrench, Part Number 3823208, and screwdriver socket, Part Number 3823209, to check the captive nut assembly on the solenoid for the correct torque.
To reduce the possibility of connector damage, do not use probes or leads other than the mating connector. The leads must fit tightly in the connector without expanding the pins in the connector.
If the resistance is correct, check the solenoid wires for an open circuit.
Connect a mating connector with short lead extensions to the injector side of the 2-pin connector.
Touch one multimeter probe to the end of the short lead extension. Touch the other multimeter probe to the captive nut assembly of the injector solenoid wire. Measure the resistance. Repeat the procedure for the other injector wire. The resistance for both of these checks
must be less than 10 ohms. If the resistance is more than 10 ohms, replace the injector solenoid wires. Refer to Procedure
Check the actuator harness for an open circuit. Refer to the chart at the beginning of this section for the pins required. Cylinder number 1 will be used as an example. Insert a test lead into the supply pin (pin 1 in this example) of the actuator harness. Connect the alligator clip to the multimeter probe.
To reduce the possibility of connector damage, do not use probes or leads other than the mating connector. The leads must fit tightly in the connector without expanding the pins in the connector.
Connect a mating connector with short lead extensions to the 2-pin Deutsch connector of the actuator harness.
Touch the other multimeter probe to the end of the short lead extension connected to the number 1 pin of the connector. Measure the resistance. The resistance
must be less than 10 ohms. If more than 10 ohms are measured, repair the wire or replace the actuator harness. Refer to Procedure
NOTE: The 2-pin connector is labeled 1 and 2. The injector solenoid is
not polarity sensitive; therefore, the wires in the connector can be reversed. If the resistance value is out of specification (open circuit), move the multimeter probe from pin 1 to pin 2 and measure the resistance again.
Insert a test lead into the return pin (pin 10 in this example) of the actuator harness. Touch the other multimeter probe to the end of the short lead extension connected to pin 2 of the connector.
Connect the 2-pin connector to the pass-through connector and connect the AMP connector to the ECM. Install the rocker housing cover when the repair is completed.
Check the injector circuit for a short circuit to chassis ground. Remove the test lead from the injector return pin (pin 10 in this example) of the actuator harness connector at the ECM. Touch the multimeter probe to the engine block ground.
If the resistance value is less than 100k ohms, there is a short circuit to ground in the injector solenoid, the injector solenoid wires, the internal actuator harness, or the external actuator harness. Proceed as follows to locate the short circuit to ground. If the resistance value is correct, the circuit
must still be checked for a short circuit from pin to pin.
Check the injector solenoid for a short circuit to ground. Disconnect the injector supply and return wires from the injector solenoid of the problem cylinder.
Use a small screwdriver to remove the protective cap from the solenoid.
Remove the captive nut assembly from the injector solenoid.
Touch one multimeter probe to one of the injector solenoid posts. Touch the other multimeter probe to the engine block ground. Measure the resistance. The resistance
must be more than 100k ohms (open circuit). If the resistance is less than 100k ohms, replace the injector. Refer to Procedure
006-026 in the Troubleshooting and Repair Manual, M11 Series Engines (STC, CELECT™, and CELECT™ Plus models), Bulletin
If the resistance value is correct, the problem is in the internal or external actuator harness. Isolate the problem by checking each harness separately.
Check the internal actuator harness for a short circuit to ground. Disconnect the 2-pin connector of the injector solenoid wires from the internal actuator harness. Touch the multimeter probe on the supply pin (pin A) of the connector, internal actuator harness side. Touch the other multimeter probe to the engine block ground.
Remove the multimeter probe from the supply pin (pin A) and touch it to the return pin (pin B). Touch the other multimeter probe to the engine block ground. Measure the resistance. The resistance
If less than 100k ohms are measured in either check, there is a short circuit to ground in the internal actuator harness. Replace the harness. Refer to Procedure
Check the external actuator harness for a short to ground. Refer to the chart at the beginning of this section for the actuator connector pins of the problem cylinder’s injector circuit. Cylinder number 1 will be used in this example.
Make sure the 12-pin connector is still disconnected.
Place a test lead into the supply pin (pin 1 in this example) of the actuator harness. Connect the alligator clip to the multimeter probe. Touch the other multimeter probe to the engine block ground. Measure the resistance. The resistance
Remove the test lead from the supply pin (pin 1 in this example) and insert it in the return pin (pin 10 in this example). Touch the other multimeter probe to the engine block ground. Measure the resistance. The resistance
must be more than 100k ohms (open circuit). If less than 100k ohms are measured in either check, there is a short to ground. Repair or replace the external actuator harness. Refer to Procedure
Check the injector circuit for a short circuit to chassis ground. Remove the lead from the injector return pin (pin 10 in this example) of the actuator harness at the ECM. Touch the multimeter probe to the engine block ground.
If the resistance value is less than 100k ohms, there is a short circuit to ground in the injector solenoid, the injector solenoid wires, or the actuator harness. Proceed as follows to locate the short circuit to ground. If the resistance value is correct, the circuit
must still be checked for a short circuit from pin to pin.
Touch one of the multimeter probes to one of the pins of the pass-through connector. Touch the other multimeter probe to the engine block ground. Measure the resistance. The resistance
not more than 100k ohms, remove the valve cover of the problem cylinder to check the injector solenoid wires and the injector solenoid for a short circuit to ground.
Check the injector solenoid for a short circuit to ground. Disconnect the injector supply and return wires from the injector solenoid of the problem cylinder.
Use a small screwdriver to remove the protective cover from the solenoid.
Remove the captive nut assembly from the injector solenoid.
Touch one multimeter probe to one of the injector solenoid posts. Touch the other multimeter probe to the engine block ground. Measure the resistance. The resistance
must be more than 100k ohms (open circuit). If the resistance is less than 100k ohms, replace the injector. Refer to Procedure
006-026 in the Troubleshooting and Repair Manual, N14 Series Engines (STC, CELECT™, CELECT™ Plus models), Bulletin
3666142. If the resistance is within specifications, proceed with this procedure.
Check the actuator harness for a short to ground. Refer to the chart at the beginning of this section for the actuator connector pins of the problem cylinder’s injector circuit. Cylinder number 1 will be used in this example.
Make sure the 2-pin Deutsch connector is still disconnected from the pass-through.
Place a test lead into the supply pin (pin 1 in this example) of the actuator connector. Connect the alligator clip to the multimeter probe. Touch the other multimeter probe to the engine block ground. Measure the resistance. The resistance
Remove the test lead from the supply pin (pin 1 in this example) and insert it into the return pin (pin 10 in this example). Touch the other multimeter probe to the engine block ground. Measure the resistance. The resistance
must be more than 100k ohms (open circuit). If less than 100k ohms are measured in either check, there is a short to ground. Repair or replace the actuator harness. Refer to Procedure
Connect the 2-pin connector to the pass-through connector and connect the AMP connector to the ECM. Install the rocker housing cover when the repair is completed.
The batteries must be disconnected before performing this check. The multimeter will be damaged if the batteries are not disconnected.
Check for a short circuit between the wires for the problem injector and all other wires in the actuator harness. Refer to the chart at the beginning of this section for the pins of the injector circuit of the problem cylinder. Cylinder number 1 will be used in this example.
Make sure that the 12-pin connector and the 2-pin connector of the injector solenoid wires are connected.
Insert a test lead into the supply pin (pin 1 in this example). Insert the other test lead into all of the pins of the harness except the return pin (pin 10 in this example) of the problem cylinder. Measure the resistance. The resistance
If less than 100k ohms are measured between the supply pin and pins 7, 9, 16, 18, 20, 21, 22, 23, 25, 26, 27, and 28, there is a short circuit in the external actuator harness between the supply or return wire to any pin that measured less than 100k ohms. Repair or replace the external actuator wiring harness. Refer to Procedure
If less than 100k ohms are measured between the supply pin (pin 1 in this example) and the other injector pins 2, 3, 4, 5, 6, 11, 12, 13, 14, and 15, the short circuit between the pins
must be isolated to the internal or external actuator harness.
Use a Torx® (six-point star) screwdriver (size T-25) to remove the screw and disconnect the 12-pin connector to separate the internal and external actuator harnesses.
Insert the test lead into the supply pin (pin 1 in this example). Insert the other lead into the pins that measured less than 100k ohms (short circuit). Measure the resistance.
Move the test lead from the supply pin (pin 1 in this example) and insert it into the return pin (pin 10 in this example). Insert the other lead into the pins that measured less than 100k ohms (short circuit). Measure the resistance.
If the resistance is less than 100k ohms in either of these checks, repair or replace any two wires that measured less than 100k ohms, or replace the external actuator harness. Refer to Procedure
Check for a short circuit from pin to pin in the 12-pin connector, internal actuator harness side. Refer to the chart at the beginning of this section for the pins of the injector circuit of the problem cylinder. Cylinder number 1 will be used in this example.
Touch the multimeter probe to the supply pin (pin A) of the 12-pin connector, internal actuator harness side. Touch the other multimeter probe to all other pins at the connector. Measure the resistance. The resistance
Move the multimeter probe from the supply pin (pin A) to the return pin (pin B). Touch the other multimeter probe to all of the other pins at the 12-pin connector. Measure the resistance. The resistance
If less than 100k ohms are measured in either check, there is a short circuit between any wires that measured less than 100k ohms. Replace the internal actuator harness. Refer to Procedure
The batteries must be disconnected before performing this check. The multimeter will be damaged if the batteries are not disconnected.
Disconnect the batteries.
Check for a short circuit between the wires for the problem injector and all other wires in the actuator harness. Refer to the chart at the beginning of this section for the pins of the injector circuit of the problem cylinder. Cylinder number 1 will be used in this example.
Make sure the 2-pin connector and the 2-pin connector of the injector solenoid wires are connected.
Insert a test lead into the supply pin (pin 1 in this example). Insert the other lead into all of the pins of the connector except the return pin
(pin 10 in this example) of the problem cylinder. Measure the resistance. The resistance
If less than 100k ohms are measured between the supply pins and any pin, there is a short circuit in the actuator harness between the supply or return wire to any pin that measured less than 100k ohms. Repair or replace the actuator harness. Refer to Procedure
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