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FAULT CODE 324 N14

Injector Circuit Number 3

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Overview

N14

CODE REASON EFFECT
Fault Code: 324
PID: S003
SPN: 736
FMI: 5
LAMP: Yellow
SRT: 00-605		 No current detected at number 3 injector return pin 12 of the actuator harness connector when the voltage supply at pin 3 of the actuator harness connector is on. Engine speed derate to 1400 to 1600 rpm. Current to injector is shut off.

Injector Circuit Number 3

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

The N14 has an external actuator harness. It extends from the C connector port in the ECM and runs along the left side of the rocker boxes. There it attaches to the pass-through connectors mounted in the side of each rocker box. The injector pigtail connectors are attached to the internal side of the pass-through connectors.

Shop Talk

  • Inspect the injector pigtail wires to 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 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
Part Number 3823994 – female 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.

Troubleshooting Steps

STEPS SPECIFICATIONS
STEP 1. Check the injector.
STEP 1A. Inspect the injector solenoid wire and pass-through connector pins. Dirty or 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 324 active?
STEP 2. Check the pass-through connector.
STEP 2A. Inspect the pass-through connector and actuator harness connector pins. Dirty or damaged pins?
STEP 2B. Check the pass-through connector for damage. No damaged connector?
STEP 2C. Check for an open circuit. Less than 10 ohms?
STEP 2D. Read the fault codes. Fault Code 324 active?
STEP 3. Check the actuator harness.
STEP 3A. Inspect the actuator harness and ECM connector pins Dirty or damaged pins?
STEP 3B. Read the fault codes. Fault Code 324 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 324 inactive?
STEP 4B. Clear the inactive fault codes. All fault codes cleared?

Guided Step 1 – Check the injector.

Guided Step 1A – Inspect the injector solenoid wire and pass-through connector pins.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the injector solenoid wires from the pass-through connector.

Action

Inspect the injector solenoid wire and pass-through connector pins for:

  • Loose connector
  • Corroded pins
  • Bent or broken pins
  • Pushed back or expanded pins
  • Moisture in or on the connector
  • Missing or damaged connector seals
  • Dirt or debris on or in the connector pins
  • Connector shell broken
  • Wire insulation damage
  • Damaged connector locking tab.

For general inspection techniques, refer to Procedure
019-361 in Section 19.
OK NOT OK
Dirty or damaged pins? Repair the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins. Use electronic contact cleaner, Part Number 3824510.
  • Install the appropriate connector seal if it is damaged or missing.
  • Replace the injector solenoid wire. Refer to Procedure
    019-058 in Section 19.
  • Replace the pass-through connector. Refer to Procedure
    019-200 in Section 19.

Guided Step 1B – Check for an open circuit.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the injector solenoid wires from the pass-through connector and the injector solenoid.

Action

Check for an open circuit.

  • 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 true solenoid resistance.
OK NOT OK
Less than 10 ohms? Replace the injector solenoid wires. Refer to Procedure
019-058 in Section 19.

Guided Step 1C – Check for an open circuit in the solenoid.

Conditions

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

Action

Check for an open circuit in the solenoid.

  • 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 true solenoid resistance.
OK NOT OK
0.5 to 1.5 ohms? Replace the injector. Refer to Procedure
006-026 in Section 6 in the Troubleshooting and Repair Manual N14 Series Engines (STC, CELECT™, CELECT Plus™ models), Bulletin 3666142.

Guided Step 1D – Check for a short circuit to ground.

Conditions

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

Action

Check for a short circuit to ground.

  • 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 Procedure
006-026 in Section 6 in the Troubleshooting and Repair Manual N14 Series Engines (STC, CELECT™, CELECT Plus™ models), Bulletin 3666142.

Guided Step 1E – Read the fault codes.

Conditions

  • Turn keyswitch OFF.
  • Connect all components.
  • Connect INSITE™ electronic service tool.

Action

Read the fault codes.

  • Start the engine and let it idle for 1 minute.
  • Use INSITE™ electronic service tool to read the fault codes.
OK NOT OK
Fault Code 324 active? Repair complete.

Guided Step 2 – Check the pass-through connector.

Guided Step 2A – Inspect the pass-through connector and actuator harness connector pins.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the actuator harness from the pass-through connector.

Action

Inspect the pass-through connector and actuator harness connector pins for:

  • Loose connector
  • Corroded pins
  • Bent or broken pins
  • Pushed back or expanded pins
  • Moisture in or on the connector
  • Missing or damaged connector seals
  • Dirt or debris on or in the connector pins
  • Connector shell broken
  • Wire insulation damage
  • Damaged connector locking tab.

For general inspection techniques, refer to Procedure
019-361 in Section 19.
OK NOT OK
Dirty or damaged pins? Repair the damaged pins. Repair or replace the actuator harness or engine harness.

  • Flush the dirt, debris, or moisture from the connector pins. Use electronic contact cleaner, Part Number 3824510.
  • Install the appropriate connector seal if it is damaged or missing.
  • Repair the actuator harness. Refer to Procedures
    019-201,
    019-202, or
    019-205 in Section 19.
  • Replace the actuator harness. Refer to Procedure
    019-043 in Section 19.
  • Replace the pass-through connector. Refer to Procedure
    019-200 in Section 19.

Guided Step 2B – Check the pass-through connector for damage.

Conditions

  • Turn keyswitch OFF;
  • Disconnect the actuator harness from the pass-through connector.
  • Disconnect the injector from the pass-through connector.

Action

Check the pass-through connector for damage.

  • Remove the injector pass-through connector.
  • Check for a cracked or broken connector.
OK NOT OK
No damaged connector? Replace the pass-through connector. Refer to Procedure
019-200 in Section 19.

Guided Step 2C – Check for an open circuit.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the actuator harness from the pass-through connector.
  • Disconnect the injector from the pass-through connector.

Action

Check for an open circuit in the pass-through connector.

  • Measure the resistance from pin 1 on both sides of the pass-through connector.
  • Measure the resistance from pin 2 on both sides of the pass-through connector.
OK NOT OK
Less than 10 ohms? Replace the pass-through connector. Refer to Procedure
019-200 in Section 19.

Guided Step 2D – Read the fault codes.

Conditions

  • Turn keyswitch OFF.
  • Connect all components.
  • Connect INSITE™ electronic service tool.

Action

Read the fault codes.

  • Start the engine and let it idle for 1 minute.
  • Use INSITE™ electronic service tool to read the fault codes.
OK NOT OK
Fault Code 324 active? Repair complete.

Guided Step 3 – Check the actuator harness.

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

Inspect the actuator harness and the ECM connector pins for:

  • Loose connector
  • Corroded pins
  • Bent or broken pins
  • Pushed back or expanded pins
  • Moisture in or on the connector
  • Missing or damaged connector seals
  • Dirt or debris on or in the connector pins
  • Connector shell broken
  • Wire insulation damage
  • Damaged connector locking tab.

For general inspection techniques, refer to Procedure
019-361 in Section 19.
OK NOT OK
Dirty or damaged pins? Repair the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins. Use electronic contact cleaner, Part Number 3824510.
  • Repair the actuator harness. Refer to Procedure
    019-203 in Section 19.
  • Replace the actuator harness. Refer to Procedure
    019-043 in Section 19.
  • Call for authorization to replace the ECM. Upon receipt of authorization, refer to Procedure
    019-031 in Section 19.
  • Replace the o-ring on the 28-pin connector if it is damaged or missing. Refer to Procedure
    019-203 in Section 19.

Guided Step 3B – Read the fault codes.

Conditions

  • Turn keyswitch OFF.
  • Connect all components.
  • Connect INSITE™ electronic service tool.

Action

Read the fault codes.

  • Start the engine and let it idle for 1 minute.
  • Use INSITE™ electronic service tool to read the fault codes.
OK NOT OK
Fault Code 324 active? Repair complete.

Guided Step 3C – Check for an open circuit.

Conditions

  • Turn keyswitch OFF.
  • Disconnect the actuator harness connector from the ECM.
  • Disconnect the actuator harness from the pass-through connector.

Action

Check for an open circuit.

  • Measure the resistance from pin 3 of the actuator harness connector to pin 1 on the harness side of the 2-pin connector.
  • Measure the resistance from pin 12 of the actuator harness connector to pin 2 on the harness side of the 2-pin connector.
OK NOT OK
Less than 10 ohms? Replace the actuator harness. Refer to Procedure
019-043 in Section 19.

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 pass-through connector.

Action

Check for a short circuit to ground.

  • Measure the resistance from pin 3 of the actuator harness connector to engine block ground.
  • Measure the resistance from pin 12 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 in Section 19.

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 pass-through connector.

Action

Check for a short circuit from pin to pin in the external actuator harness.

  • Measure the resistance from pin 3 of the actuator harness connector to all other pins in the connector.
  • Measure the resistance from pin 12 of the actuator harness connector to all other pins in the connector.
OK NOT OK
More than 100k ohms?

  • Call for authorization to replace the ECM. Upon receipt of authorization, refer to Procedure
    019-031 in Section 19.
 Replace the actuator harness. Refer to Procedure
019-043 in Section 19.

Guided Step 4 – Clear the fault codes.

Guided Step 4A – Disable the fault code.

Conditions

  • Connect all components.
  • Connect INSITE™ electronic service tool.

Action

Disable the fault codes.

  • Start the engine and let it idle for 1 minute.
  • Use INSITE™ electronic service tool to verify Fault Code 324 is inactive.
OK NOT OK
Fault Code 324 inactive? Return to the troubleshooting steps or contact a 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.
  • Connect INSITE™ electronic service tool.

Action

Clear the inactive fault codes.

  • Use INSITE™ electronic service tool to clear the inactive fault codes.
OK NOT OK
All fault codes cleared? Troubleshoot any remaining active fault codes.
Repair complete
Appropriate troubleshooting chart
Last Modified:  13-Jan-2009
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