The engine control module (ECM) supplies voltage to each fuel injector on the injector positive voltage control circuits. The ECM energizes each fuel injector by grounding the control circuit of that fuel injector. The ECM monitors the status of the injector positive voltage control circuits and the fuel injector control circuits.

When the ECM detects a fuel injector circuit condition, the fuel injectors in the affected group will be disabled.

The ECM detects an open, short to ground, or a short to voltage on the voltage supply circuit of the fuel injector.

DTCs P2146 and P2149 are Type A DTCs.

DTCs P2146 and P2149 are Type A DTCs.

The fuel injectors are separated into the following groups:

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, observe the DTC information with a scan tool. DTCs P2146 or P2149 should not set.
2. 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.

1. Ignition OFF, disconnect the harness connector at the appropriate fuel injectors. Refer to diagnostic aids.
2. Verify a test lamp does not illuminate between any of the fuel injector circuits and B+.

⇒	If the test lamp illuminates, test the appropriate circuit for a short to ground. If the circuit tests normal, replace the ECM.

3. Test for less than 1 volt on all of the fuel injector circuits.

⇒	If greater than the specified range, test the circuit for a short to voltage. If the circuits test normal, replace the ECM.

4. Test for less than 1 ohm on all of the appropriate fuel injector circuits.

⇒	If greater than the specified range, repair the appropriate circuit for a high resistance.

5. If all circuits test normal, test or replace the fuel injector.

1. Disconnect the harness connector at the appropriate fuel injector.

Important: The DMM and test leads must be calibrated to 0 ohms in order to prevent misdiagnosis.

2. Test for 0.3-0.7 ohms between the low control terminal 1 and the high control terminal 2.

⇒	If not within the specified range, replace the fuel injector.

3. Test for infinite resistance between each terminal of the fuel injector and ground.

⇒	If not the specified value, replace the fuel injector.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Ignition ON, observe the scan tool DPF soot mass parameter. The parameter should be less than 24 grams.