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 P0201: Fuel Injector 1 Control CircuitDTC P0201 04: Fuel Injector 1 Control Circuit Open
DTC P0202: Fuel Injector 2 Control Circuit
DTC P0202 04: Fuel Injector 2 Control Circuit Open
DTC P0203: Fuel Injector 3 Control Circuit
DTC P0203 04: Fuel Injector 3 Control Circuit Open
DTC P0204: Fuel Injector 4 Control Circuit
DTC P0204 04: Fuel Injector 4 Control Circuit Open
DTC P1224: Fuel Injector 1 Control Circuit
DTC P1224 01: Fuel Injector 1 Control Circuit Short to Battery
DTC P1227: Fuel Injector 2 Control Circuit
DTC P1227 01: Fuel Injector 2 Control Circuit Short to Battery
DTC P122A: Fuel Injector 3 Control Circuit
DTC P122A 01: Fuel Injector 3 Control Circuit Short to Battery
DTC P1233: Fuel Injector 4 Control Circuit
DTC P1233 01: Fuel Injector 4 Control Circuit Short to Battery
Diagnostic Fault Information
Fuel Injector Circuits | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
Fuel Injector Positive Voltage Control Group 1 | P2146 | P2146 | P0201, P0204 | P2146 | -- |
Fuel Injector Positive Voltage Control Group 2 | P2149 | P2149 | P0202, P0203 | P2149 | -- |
Fuel Injector 1 Control | P0201 | P2146 | P0201 | P0201 | -- |
Fuel Injector 2 Control | P0202 | P2149 | P0202 | P0202 | -- |
Fuel Injector 3 Control | P0203 | P2149 | P0203 | P0203 | -- |
Fuel Injector 4 Control | P0204 | P2146 | P0204 | P0204 | -- |
Circuit/System Description
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. The injectors are separated into the following two groups:
| • | Group 1 - DTC P2146 for injectors 1 and 4 |
| • | Group 2 - DTC P2149 for injectors 2 and 3 |
When a fuel injector circuit condition is detected by the ECM, the affected fuel injectors will be disabled and may disable the affected group of fuel injectors.
Conditions for Running the DTC
| • | The engine is running. |
| • | The ECM monitors for a condition once per camshaft revolution. |
Conditions for Setting the DTC
The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match.
Action Taken When the DTC Sets
DTCs P0201, P0202, P0203, P0204, P1224, P1227, P122A, and P1233 are Type A DTCs.
Conditions for Clearing the DTC
DTCs P0201, P0202, P0203, P0204, P1224, P1227, P122A, and P1233 are Type A DTCs.
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, observe the DTC information with a scan tool. DTCs P2146 or P2149 should not set.
- 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 are captured in the Freeze Frame/Failure Records Data List.
| ⇒ | If any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle. |
Circuit/System Testing
- Disconnect the harness connector at the appropriate fuel injector.
- Ignition ON, test for 5.8-7.8 volts between the low control circuit terminal 1 and ground.
- Ignition ON, connect a test lamp between the affected fuel injector low control circuit terminal 1 and ground.
- Engine cranking or running, the test lamp should illuminate or flash.
- If all circuits test normal, test or replace the fuel injector.
| ⇒ | If less than the specified range, test the low control circuit for an open/high resistance or for a short to ground. If the circuit tests normal, replace the ECM. |
| ⇒ | If greater than the specified range, test the low control circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
| ⇒ | If the test lamp does not illuminate or flash, replace the ECM. |
Component Testing
- Disconnect the harness connector at the appropriate fuel injector.
- Test for 0.2-0.3 ohms of resistance between the low control terminal 1 and the high control terminal 2.
- Test for infinite resistance between each terminal and ground.
Important: The DMM and test leads must be calibrated to 0 ohms in order to prevent misdiagnosis.
| ⇒ | If not within the specified range, replace the fuel injector. |
| ⇒ | If not the specified value, replace the fuel injector. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, programming, and setup |
Repair Verification
Ignition ON, observe the scan tool DPF soot mass parameter. The parameter should be less than 24 grams.
| ⇒ | If greater than the specified range, perform a DPF service regeneration. Refer to Exhaust Particulate Filter Cleaning. |
