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DTC P0261, P0262, P0264, P0265, P0267, P0268, P0270, or P0271 - FX3

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P0261: Cylinder 1 Injector 1 Control Circuit Low Voltage

DTC P0262: Cylinder 1 Injector Control Circuit High Voltage

DTC P0264: Cylinder 2 Injector Control Circuit Low Voltage

DTC P0265: Cylinder 2 Injector Control Circuit High Voltage

DTC P0267: Cylinder 3 Injector Control Circuit Low Voltage

DTC P0268: Cylinder 3 Injector Control Circuit High Voltage

DTC P0270: Cylinder 4 Injector Control Circuit Low Voltage

DTC P0271: Cylinder 4 Injector Control Circuit High Voltage

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Ignition

1

2

-

-

Injector 1 Control

P0261, P0300

P0261, P0300

P0262, P0300

-

Injector 2 Control

P0264, P0300

P0264, P0300

P0265, P0300

-

Injector 3 Control

P0267, P0300

P0267, P0300

P0268, P0300

-

Injector 4 Control

P0270, P0300

P0270, P0300

P0271, P0300

-

1. Engine cranks but does not run and the fuse for the injector circuit opens.

2. Engine cranks but does not run.

Circuit/System Description

The engine control module (ECM) enables the appropriate fuel injector pulse for each cylinder. Ignition voltage is supplied to the fuel injectors. The ECM controls each fuel injector by grounding the control circuit via a solid state device called a driver. The ECM monitors the status of each driver.

Conditions for Running the DTC
    • DTC P0562 or P0563 is not set.
    • The ignition is ON.
    • The ignition voltage is between 11-16V.
    • The DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC

P0261, P0264, P0267, or P0270

The ECM detects a short circuit to ground or an open circuit on the injector control circuit.

P0262, P0265, P0268, or P0271

The ECM detects a short circuit to voltage on the injector control circuit.

Action Taken When the DTC Sets

DTC P0261, P0262, P0264, P0265, P0267, P0268, P0270, and P0271 are Type E DTCs.

Conditions for Clearing the DTC

DTC P0261, P0262, P0264, P0265, P0267, P0268, P0270, and P0271 are Type E DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics : Siemens ECM - LPG with LCP → Siemens ECM - Gas without FX3 or LCP → Delphi ECM - FX3

Description and Operation

Fuel System Description

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

J 34730-405 Injector Test Lamp

For regional equivalent tools, refer to Special Tools.

Circuit/System Verification

Note: If you were sent here from engine cranks but does not run, proceed to circuit/system testing.

  1. Engine running, verify that the DTCs P0261, P0262, P0264, P0265, P0267, P0268, P0270, or P0271 is not set.
  2. Observe the injector control circuit test status parameters. Each of the injector control circuit test status parameters should display OK or Not Run.
  3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the appropriate fuel injector.
    2. • Q17A Fuel Injector 1
    • Q17B Fuel Injector 2
    • Q17C Fuel Injector 3
    • Q17D Fuel Injector 4
  2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.
    3. ⇒If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. Replace the fuse if necessary.
  3. Ignition OFF, connect a J 34730-405 lamp between the control circuit terminal 2 and the ignition circuit terminal 1.
  4. Engine running, verify the test lamp flashes.
    5. ⇒If the test lamp is always ON, test the control circuit for a short to ground. If circuit tests normal, replace the K20 ECM.
    ⇒If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If circuit tests normal, replace the K20 ECM.
  5. If all circuits test normal, test or replace the appropriate fuel injector.
    6. • Q17A Fuel Injector 1
    • Q17B Fuel Injector 2
    • Q17C Fuel Injector 3
    • Q17D Fuel Injector 4

Component Testing
  1. Ignition OFF, disconnect the harness connector at the appropriate fuel injector.
    2. • Q17A Fuel Injector 1
    • Q17B Fuel Injector 2
    • Q17C Fuel Injector 3
    • Q17D Fuel Injector 4

    Note: The engine coolant temperature (ECT) must be between 10-32°C (50-90°F) in order for an accurate measurement.

  2. Test for 11-14Ω between the ignition terminal 1 and the control terminal 2.
    3. ⇒If not within the specified range, replace the appropriate fuel injector.
    • Q17A Fuel Injector 1
    • Q17B Fuel Injector 2
    • Q17C Fuel Injector 3
    • Q17D Fuel Injector 4

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Fuel Injection Fuel Rail Assembly Replacement
    • Control Module References for ECM replacement, setup, and programming
   


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