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FAULT CODE 331 M11/L10

Injector Circuit Number 2

Printable Version  Printable Version

Overview

CODE REASON EFFECT
Fault Code: 331
PID: S002
SPN: 735
FMI: 5
LAMP: Yellow
SRT: 00-605		 No current detected at number 2 injector return pin 14 of the actuator harness connector when the voltage supply at pin 5 of the actuator harness connector is on. Engine speed derates to 1400 to 1600 rpm. Current to injector is shut off.

Injector Circuit Number 2

Circuit Description

The injector solenoid valves are actuated by the electronic control module (ECM) to control fuel metering and timing. Each injector solenoid is connected to the ECM by a supply wire and a return wire. An electrical pulse is sent to the injector from the ECM on the supply wire and returns to the ECM on the return wire after actuating the solenoid. Each solenoid valve is normally open, and it is only closed by an electrical pulse from the ECM during fuel injection and metering.

Component Location

There are two pieces to an M11 actuator harness – one internal and the other external. The external portion of the actuator harness extends from the C connector port in the ECM to the backside of the rocker lever housing. The external harness connects to the internal harness at a 12-pin connector. The internal actuator harness runs along the inside of the rocker lever housing on the right side. It has six connectors spaced along its length – one for each injector solenoid. These connectors attach to the pigtail connector on each injector.

 

Shop Talk

  • Inspect the injector pigtail wires, and make sure no wires are shorting to ground against the push rods or push tubes.
  • Examine the injector pigtail nuts, and make sure they are tightened down to the proper torque. Confirm that the pigtail nuts and solenoid posts do not have damaged threads.

Cautions and Warnings

 WARNING 

 

The injector solenoids receive high voltage when the engine is operating. To reduce the possibility of personal injury from electrical shock, do not wear jewelry or damp clothing, and do not touch the injector solenoids or the solenoid wires when the engine is operating.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead
Part Number 3823993 – male Deutsch test lead.
 CAUTION 

 

To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3823993 – male Deutsch test lead.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.

Troubleshooting Steps

STEPS SPECIFICATIONS
STEP 1. Check the injector.
STEP 1A. Inspect the injector solenoid wire and internal actuator harness pins. No damaged pins
STEP 1B. Check for an open circuit. Less than 10 ohms
STEP 1C. Check for an open circuit in the solenoid. 0.5 to 1.5 ohms
STEP 1D. Check for a short circuit to ground. More than 100k ohms
STEP 1E. Read the fault codes. Fault Code 331 active
STEP 2. Check the internal actuator harness.
STEP 2A. Inspect the internal and external actuator harness connector pins. No damaged pins
STEP 2B. Check for an open circuit. Less than 10 ohms
STEP 2C. Check for a short circuit to ground. More than 100k ohms
STEP 2D. Check for a short circuit from pin to pin. More than 100k ohms
STEP 2E. Read the fault codes. Fault Code 331 active
STEP 3. Check the actuator harness.
STEP 3A. Inspect the actuator harness and ECM connector pins. No damaged pins
STEP 3B. Read the fault codes. Fault Code 331 active
STEP 3C. Check for an open circuit. Less than 10 ohms
STEP 3D. Check for a short circuit to ground. More than 100k ohms
STEP 3E. Check for a short circuit from pin to pin. More than 100k ohms
STEP 4. Clear the fault codes.
STEP 4A. Disable the fault code. Fault Code 331 inactive
STEP 4B. Clear the inactive fault codes. All fault codes cleared

Guided Step 1 – Check the injector.

 WARNING 

 

The injector solenoids receive high voltage when the engine is operating. To reduce the possibility of personal injury from electrical shock, do not wear jewelry or damp clothing, and do not touch the injector solenoids or the solenoid wires when the engine is operating.
Guided Step 1A – Inspect the injector solenoid wire and internal actuator harness pins.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the injector solenoid wires from the internal actuator harness.

Action

  • Bent or broken pins
  • Pushed back or expanded pins
  • Corroded pins
  • Moisture in or on the connector
  • Missing or damaged seals.
OK NOT OK
No damaged pins Repair the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins using electronic contact cleaner, Part Number 3824510.
  • Replace the injector solenoid wire. Refer to Procedure 019-058.
  • Repair or replace the internal actuator harness. Refer to Procedure 019-043.

 WARNING 

 

The injector solenoids receive high voltage when the engine is operating. To reduce the possibility of personal injury from electrical shock, do not wear jewelry or damp clothing, and do not touch the injector solenoids or the solenoid wires when the engine is operating.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3823993 – male Deutsch test lead.
Guided Step 1B – Check for an open circuit.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the injector solenoid wires from the internal actuator harness.

Action

  • Measure the resistance from each pin on the injector solenoid wire and its corresponding captive nut assembly.

Note: Subtract the lead resistance of the multimeter to get the true solenoid resistance.
OK NOT OK
Less than 10 ohms Replace the injector solenoid wires. Refer to Procedure 019-058.

 WARNING 

 

The injector solenoids receive high voltage when the engine is operating. To reduce the possibility of personal injury from electrical shock, do not wear jewelry or damp clothing, and do not touch the injector solenoids or the solenoid wires when the engine is operating.
Guided Step 1C – Check for an open circuit in the solenoid.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the injector pigtail connector from the solenoid.

Action

  • Measure the resistance of the multimeter probes by touching them together and noting the resistance value.
  • Measure the resistance between the two solenoid posts on the injector.

Note: Subtract the lead resistance of the multimeter to get the true solenoid resistance.
OK NOT OK
0.5 to 1.5 ohms Replace the injector. Refer to Troubleshooting and Repair Manual, M11 Series Engines (STC, CELECT™, CELECT™ Plus models), Bulletin 3666139.

 WARNING 

 

The injector solenoids receive high voltage when the engine is operating. To reduce the possibility of personal injury from electrical shock, do not wear jewelry or damp clothing, and do not touch the injector solenoids or the solenoid wires when the engine is operating.
Guided Step 1D – Check for a short circuit to ground.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the injector pigtail connector from the solenoid.

Action

  • Measure the resistance from one of the solenoid posts to engine block ground.
OK NOT OK
More than 100k ohms Replace the injector. Refer to the Troubleshooting and Repair Manual, M11 Series Engines (STC, CELECT™, CELECT™ Plus models), Bulletin 3666139.

Guided Step 1E – Read the fault codes.

Conditions

  • Turn keyswitch OFF.
  • Connect all components.

Action

  • Start the engine and let it idle for 1 minute.
  • Read the fault codes using INSITE™.
OK NOT OK
Fault Code 331 active Repair complete.

Guided Step 2 – Check the internal actuator harness.

 WARNING 

 

The injector solenoids receive high voltage when the engine is operating. To reduce the possibility of personal injury from electrical shock, do not wear jewelry or damp clothing, and do not touch the injector solenoids or the solenoid wires when the engine is operating.
Guided Step 2A – Inspect the internal and external actuator harness connector pins.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the internal actuator harness from the 12-pin connector.
  • Disconnect the external actuator harness from the 12-pin connector.

Action

  • Bent or broken pins
  • Pushed back or expanded pins
  • Corroded pins
  • Moisture in or on the connector
  • Missing or damaged seals.
OK NOT OK
No damaged pins Repair the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins using electronic contact cleaner, Part Number 3824510.
  • Repair the actuator harness. Refer to Procedure 019-201, 019-202, or 019-205.
  • Replace the actuator harness. Refer to Procedure 019-043.
  • Replace the internal actuator harness. Refer to Procedure 019-043.

 WARNING 

 

The injector solenoids receive high voltage when the engine is operating. To reduce the possibility of personal injury from electrical shock, do not wear jewelry or damp clothing, and do not touch the injector solenoids or the solenoid wires when the engine is operating.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.
Guided Step 2B – Check for an open circuit.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the internal actuator harness from the 12-pin connector.
  • Connect the injector to the internal actuator harness.

Action

  • Measure the resistance from pin J on the internal harness side of the actuator harness 12-pin connector to each injector pigtail nut that connects to number 2 injector. (Resistance to one of these nuts must be within specification.)
  • Measure the resistance from pin K on the internal harness side of the actuator harness 12-pin connector to each injector pigtail nut that connects to number 2 injector. (Resistance to one of these nuts must be within specification.)
OK NOT OK
Less than 10 ohms Replace the internal actuator harness. Refer to Procedure 019-043.

 WARNING 

 

The injector solenoids receive high voltage when the engine is operating. To reduce the possibility of personal injury from electrical shock, do not wear jewelry or damp clothing, and do not touch the injector solenoids or the solenoid wires when the engine is operating.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.
Guided Step 2C – Check for a short circuit to ground.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the external actuator 12-pin connector.
  • Disconnect the injector from the internal actuator harness.

Action

  • Measure the resistance from pin J on the internal harness side of the actuator harness 12-pin connector to engine block ground.
  • Measure the resistance from pin K on the internal harness side of the actuator harness 12-pin connector to engine block ground.
OK NOT OK
More than 100k ohms Replace the internal actuator harness. Refer to Procedure 019-043.

 WARNING 

 

The injector solenoids receive high voltage when the engine is operating. To reduce the possibility of personal injury from electrical shock, do not wear jewelry or damp clothing, and do not touch the injector solenoids or the solenoid wires when the engine is operating.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.
Guided Step 2D – Check for a short circuit from pin to pin.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the external actuator 12-pin connector.
  • Disconnect the injector from the internal actuator harness.

Action

  • Measure the resistance from pin J on the internal harness side of the actuator harness 12-pin connector to all other pins in the connector.
  • Measure the resistance from pin K on the internal harness side of the actuator harness 12-pin connector to all other pins in the connector.
OK NOT OK
More than 100k ohms Replace the internal actuator harness. Refer to Procedure 019-043.

Guided Step 2E – Read the fault codes.

Conditions

  • Turn keyswitch OFF.
  • Connect all components.

Action

  • Start the engine and let it idle for 1 minute.
  • Read the fault codes using INSITE™.
OK NOT OK
Fault Code 331 active Repair complete.

Guided Step 3 – Check the actuator harness.

 WARNING 

 

The injector solenoids receive high voltage when the engine is operating. To reduce the possibility of personal injury from electrical shock, do not wear jewelry or damp clothing, and do not touch the injector solenoids or the solenoid wires when the engine is operating.
 CAUTION 

 

To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM.
Guided Step 3A – Inspect the actuator harness and ECM connector pins.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the actuator harness connector from the ECM.
  • Flush and clean the connector pins using electronic contact cleaner, Part Number 3824510.

Action

  • Bent or broken pins
  • Pushed back or expanded pins
  • Corroded pins
  • Moisture in or on the connector
  • Missing or damaged seals
  • Dirt or debris in or on the connector pins.
OK NOT OK
No damaged pins Repair the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins using electronic contact cleaner, Part Number 3824510.
  • Repair the actuator harness. Refer to Procedure 019-203.
  • Replace the actuator harness. Refer to Procedure 019-043.
  • Replace the ECM. Refer to Procedure 019-031.
  • Replace the o-ring on the 28-pin connector if it is damaged or missing. Refer to Procedure 019-203.

Guided Step 3B – Read the fault codes.

Conditions

  • Turn keyswitch OFF.
  • Connect all components.

Action

  • Start the engine and let it idle for 1 minute.
  • Read the fault codes using INSITE™.
OK NOT OK
Fault Code 331 active Repair complete.

 WARNING 

 

The injector solenoids receive high voltage when the engine is operating. To reduce the possibility of personal injury from electrical shock, do not wear jewelry or damp clothing, and do not touch the injector solenoids or the solenoid wires when the engine is operating.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead
Part Number 3823993 – male Deutsch test lead.
Guided Step 3C – Check for an open circuit.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the actuator harness connector from the ECM.
  • Disconnect the actuator harness 12-pin connector.

Action

  • Measure the resistance from pin 5 of the actuator harness connector to pin J on the external harness side of the actuator harness 12-pin connector.
  • Measure the resistance from pin 14 of the actuator harness connector to pin K on the external harness side of the actuator harness 12-pin connector.
OK NOT OK
Less than 10 ohms Replace the actuator harness. Refer to Procedure 019-043.

 WARNING 

 

The injector solenoids receive high voltage when the engine is operating. To reduce the possibility of personal injury from electrical shock, do not wear jewelry or damp clothing, and do not touch the injector solenoids or the solenoid wires when the engine is operating.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.
Guided Step 3D – Check for a short circuit to ground.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the actuator harness connector from the ECM.
  • Disconnect the actuator harness from the 12-pin connector.

Action

  • Measure the resistance from pin 5 of the actuator harness connector to engine block ground.
  • Measure the resistance from pin 14 of the actuator harness connector to engine block ground.
OK NOT OK
More than 100k ohms Replace the actuator harness. Refer to Procedure 019-043.

 WARNING 

 

The injector solenoids receive high voltage when the engine is operating. To reduce the possibility of personal injury from electrical shock, do not wear jewelry or damp clothing, and do not touch the injector solenoids or the solenoid wires when the engine is operating.
 CAUTION 

 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.
Guided Step 3E – Check for a short circuit from pin to pin.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the actuator harness connector from the ECM.
  • Disconnect the actuator harness from the 12-pin connector.

Action

  • Measure the resistance from pin 5 of the actuator harness connector to all other pins in the connector.
  • Measure the resistance from pin 14 of the actuator harness connector to all other pins in the connector.
OK NOT OK
More than 100k ohms Replace the actuator harness. Refer to Procedure 019-043.

Guided Step 4 – Clear the fault codes.

Guided Step 4A – Disable the fault code.

Conditions

  • Connect all components.

Action

  • Start the engine and let it idle for 1 minute.
  • Verify Fault Code 331 is inactive.
OK NOT OK
Fault Code 331 inactive Return to the troubleshooting steps or contact your nearest Cummins Authorized Repair Location if all the steps have been completed and checked again.

Guided Step 4B – Clear the inactive fault codes.

Conditions

  • Connect all components.

Action

  • Erase the inactive fault codes using INSITE™.
OK NOT OK
All fault codes cleared Troubleshoot any remaining active fault codes.
Repair complete
Appropriate troubleshooting chart
Last Modified:  10-Nov-2003
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