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Injector Circuit – Number 1
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 311 N14 PID: S001 SPN: 734 FMI: 6 LAMP: Yellow SRT: 00-604 |
Current detected at number 1 injector return pin 10 of the actuator harness connector when voltage supply at pin 1 of the actuator harness connector is off. | Engine speed derate to 1400 to 1600 rpm. Current to injector is shut off. |
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Injector Circuit – Number 1 |
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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.
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.
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 CAUTION
To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement: |
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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 actuator harness. | |
| STEP 1A. Inspect the harness and ECM connector pins. | No damaged pins | |
| STEP 1B. Read the fault codes. | Fault Code 311 active | |
| STEP 1C. Check for a short circuit from pin to pin. | More than 100k ohms | |
| STEP 2. | Check the ECM. | |
| STEP 2A. Check the ECM response. | Fault Code 311 inactive | |
| STEP 3. | Clear the fault codes. | |
| STEP 3A. Disable the fault code. | Fault Code 311 inactive | |
| STEP 3B. Clear the inactive fault codes. | All fault codes cleared | |
Guided Step 1 – Check the actuator harness.
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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.
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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 1A – Inspect the harness and the ECM connector pins. | |
|---|---|
Conditions
Action
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| OK | NOT OK |
| No damaged pins | Repair the damaged pins.
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| Guided Step 1B – Read the fault codes. | |
|---|---|
Conditions
Action
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| OK | NOT OK |
| Fault Code 311 active | Repair complete. |
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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.
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CAUTION
To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement: |
| Guided Step 1C – Check for a short circuit from pin to pin. | ||
|---|---|---|
Conditions
Action
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| OK | NOT OK | |
| More than 100k ohms | Repair or replace the actuator harness. | |
Guided Step 2 – Check the ECM.
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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 2A – Check the ECM response. | |
|---|---|
Conditions
Action
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| OK | NOT OK |
| Fault Code 311 inactive | Replace the ECM. Refer to Procedure 019-031. |
Guided Step 3 – Clear the fault codes.
| Guided Step 3A – Disable the fault code. | |
|---|---|
Conditions
Action
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| OK | NOT OK |
| Fault Code 311 inactive | Return to troubleshooting steps or contact your nearest Cummins Authorized Repair Location if all steps have been completed and checked again. |
| Guided Step 3B – Clear the inactive fault codes. | |
|---|---|
Conditions
Action
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| OK | NOT OK |
| All fault codes cleared | Troubleshoot any remaining active fault codes. |
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Repair complete
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Appropriate troubleshooting chart
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