P0204

DTC P0201 - P0204

CIRCUIT DESCRIPTION
The engine control module (ECM) calculates the optimum fuel injection on time using data sent from various engine sensors. The ECM supplies a high voltage of near 120 volts along with grounding the injector control circuit when it needs to energize the fuel injector (turn it ON). The ECM also supplies 12 volts at all times to the injector control circuit in order to verify circuit integrity. If the injector solenoid control circuit is open, DTC P0201-P0204 will set depending upon which cylinder 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 open during 16 engine rotations.

Action Taken When the DTC Sets
- 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.

Condition for Clearing the MIL/DTC
- The ECM turns OFF the MIL after 3 consecutive driving cycles when the diagnostic runs and does not fail. (12,000 lbs GVW)
- The ECM turns OFF the MIL when the diagnostic runs and does not fail. (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 emission related diagnostic after the ECM turns OFF the MIL.
- Clear the MIL and the DTC with a scan tool.

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

Check for the following conditions:
- Poor connection at the ECM: Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
- Damaged harness: Inspect the wiring harness for damage. If the harness appears to be OK, observe the "DTC P0201 - P0204" 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 engine cylinder order.
P0201: Cylinder No. 1 fuel injector
P0202: Cylinder No. 2 fuel injector
P0203: Cylinder No. 3 fuel injector
P0204: Cylinder No. 4 fuel injector

DTC P0201 - P0204
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls Connector End Views or Engine Control Module (ECM) Connector End Views

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