P0264

DTC P0261, P0264, P0267 & P0270

CIRCUIT DESCRIPTION
The engine control module (ECM) calculates the optimum fuel injection on timing using data sent from various engine sensors. The common 1 injector drive circuit is a high-voltage (near 120 volts) which drives injectors for cylinder 1 and 4 in conjunction with the ECM grounding the fuel injector solenoid control circuit. The common 2 injector drive circuit which drives injectors for cylinder 2 and 3 in conjunction with the ECM grounding the fuel injector solenoid control circuit. The ECM also supplies 12 volts at all times to the injector control circuit in order to verify circuit integrity. If the fuel injector solenoid control circuit is shorted to injector drive circuit, DTC P0261, P0264, P0267 or P0270 will set depending upon which cylinder fuel injector circuit failed.

Condition for Running the DTC
- The battery voltage is between 10-16 volts.
- The ignition switch is ON.
- The engine is running.

Condition for Setting the DTC
- The ECM detects that the fuel injector solenoid coil control circuit is shorted to fuel injector drive circuit during 16 engine rotations.

Action Taken When the DTC Sets
12,000 lbs GVW
- The ECM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Freeze Frame/Failure Records.
- The ECM limits fuel injection quantity within 70%.
- The ECM limits fuel rail pressure within 17400 psi (120 MPa).
- The ECM closes the EGR valve and holds to close position.
- The ECM inhibits the cruise control.
- The ECM inhibits the PTO control.

Except 12,000 lbs GVW
- The ECM will not illuminate the MIL when the diagnostic runs and fails.
- The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Failure Records.

Condition for Clearing the MIL/DTC
12,000 lbs GVW
- The ECM turns OFF the MIL after 3 consecutive driving cycles when the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic after the ECM turns OFF the MIL.
- Clear the MIL and the DTC with a scan tool.

Except 12,000 lbs GVW
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
- Clear the DTC with a scan tool.

Diagnostic Aids
If an intermittent condition is suspected, the following may cause an intermittent:
- Rubbed through wire insulation
- Broken wire inside the insulation

Check for the following conditions:
- Damaged harness: Inspect the wiring harness for damage. If the harness appears to be OK, observe the "DTC P0261, P0264, P0267 or P0270" display on the scan tool with engine running while moving connectors and wiring harness. A change in the display will indicate the location of the fault.

NOTE: Each Diagnostic Trouble Code (DTC) agrees with following engine cylinder.
P0261: Cylinder No. 1 fuel injector
P0264: Cylinder No. 2 fuel injector
P0267: Cylinder No. 3 fuel injector
P0270: Cylinder No. 4 fuel injector

DTC P0261, P0264, P0267 & P0270
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls Connector End Views or Engine Control Module (ECM) Connector End Views

Step 2 - 4:

Step 5 - 9:

Step 10 - 11: