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VIN L




DTC P0201, P0202, P0203, P0204, P0205, P0206, P0207, or P0208

Diagnostic Instructions

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

DTC Descriptors
DTC P0201
- Fuel Injector 1 Control Circuit

DTC P0202
- Fuel Injector 2 Control Circuit

DTC P0203
- Fuel Injector 3 Control Circuit

DTC P0204
- Fuel Injector 4 Control Circuit

DTC P0205
- Fuel Injector 5 Control Circuit

DTC P0206
- Fuel Injector 6 Control Circuit

DTC P0207
- Fuel Injector 7 Control Circuit

DTC P0208
- Fuel Injector 8 Control Circuit

Diagnostic Fault Information





Circuit/System Description

The engine control module (ECM) supplies a high voltage supply circuit and a high voltage control circuit for each fuel injector. The injector high voltage supply circuit and the high voltage control circuit are both controlled by the ECM. The ECM energizes each fuel injector by grounding the control circuit and supplying each fuel injector with up to 250 V and 20 A on the voltage supply circuit to activate the Piezo type fuel injectors. This is controlled by boost capacitors in the ECM. During the 250 V boost phase, the capacitor is used to charge the injector piezo stack, allowing for injector opening. The injector is then held open with this high voltage. At the end of the injection event the ECM closes the injector by discharging the injector piezo stack. The ECM monitors the status of the voltage supply and voltage control circuits. The injectors are separated into the following four groups:

* Group 1- injectors 1 and 4
* Group 2- injectors 6 and 7
* Group 3- injectors 2 and 5
* Group 4- injectors 3 and 8

When a fuel injector circuit fault condition is detected by the ECM, the specific fuel injector, or the two fuel injectors in the affected group may be disabled. DTCs for the injector and/or group may set.

Conditions for Running the DTC

* The engine is running.
* The charging system voltage is between 10-18 V.

Conditions for Setting the DTC

* The ECM injector output driver detects an incorrect current on a fuel injector circuit.
* The condition exists for less than 1 s.

Action Taken When the DTC Sets

DTCs P0201, P0202, P0203, P0204, P0205, P0206, P0207, and P0208 are Type A DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0201, P0202, P0203, P0204, P0205, P0206, P0207, and P0208 are Type A DTCs.

Diagnostic Aids

* The electronic control module (ECM) is sensitive to resistance on the injector circuits
* Inspect each connector terminal for loose terminal fit or signs of fretting
* Ensure that the ohm meter is zeroed before making any resistance checks

Reference Information
Schematic Reference

Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

Fuel System Description (Fuel System Description)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Engine Running, observe the following scan tool parameters.

* Cylinder 1 Injector Circuit Status
* Cylinder 2 Injector Circuit Status
* Cylinder 3 Injector Circuit Status
* Cylinder 4 Injector Circuit Status
* Cylinder 5 Injector Circuit Status
* Cylinder 6 Injector Circuit Status
* Cylinder 7 Injector Circuit Status
* Cylinder 8 Injector Circuit Status
Each parameter should display OK or Not Run.

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.

Circuit/System Testing

Danger: Before working on any high voltage fuel injection system, be aware of the following procedures:


* Do not make contact with the fuel injection harness, engine control module (ECM), or fuel injectors while the ignition is ON or RUN positions.

* Wait 5 minutes after key OFF to allow the electronic control module (ECM) to discharge before attempting to disconnect or test engine control components.

* Do not use the electronic control module (ECM) case as a ground while jump starting.


Failure to follow the procedure exactly as written may result in serious injury or death.


Note: If you cannot duplicate the condition, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

1. Verify that DTC P2146, P2149, P2152, P2155, P1224, P1227, P122A, P1233, P1236, P1239, P1242, or P1247 are not set.

• If any of the listed DTC's are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).

2. Ignition OFF, disconnect the X1, X2 and X3 harness connector at the K20 engine control module.
3. Disconnect the appropriate harness connector at the Q17 fuel injector.
4. Test for less than 5 ohm between the harness connectors of the appropriate Direct Fuel Injector (DFI) High Voltage Supply circuit listed below.

* Injector 1 terminal 1 and the ECM connector X2-13
* Injector 2 terminal 1 and the ECM connector X3-50
* Injector 3 terminal 1 and the ECM connector X3-69
* Injector 4 terminal 1 and the ECM connector X2-29
* Injector 5 terminal 1 and the ECM connector X3-70
* Injector 6 terminal 1 and the ECM connector X2-30
* Injector 7 terminal 1 and the ECM connector X2-14
* Injector 8 terminal 1 and the ECM connector X3-49

• If greater than the specified value, repair the open/high resistance in the appropriate Direct Fuel Injector (DFI) High Voltage Supply circuit.

5. Test for less than 5 ohm between the harness connectors of the appropriate Direct Fuel Injector (DFI) High Voltage Control circuit listed below.

* Injector 1 terminal 2 and the ECM connector X2-16
* Injector 2 terminal 2 and the ECM connector X3-51
* Injector 3 terminal 2 and the ECM connector X3-71
* Injector 4 terminal 2 and the ECM connector X2-15
* Injector 5 terminal 2 and the ECM connector X3-52
* Injector 6 terminal 2 and the ECM connector X2-32
* Injector 7 terminal 2 and the ECM connector X2-31
* Injector 8 terminal 2 and the ECM connector X3-72

• If greater than the specified value, repair the open/high resistance in the appropriate Direct Fuel Injector (DFI) High Voltage Control circuit.

6. Test for 150-210 kohm between terminal 1 and terminal 2 of the appropriate Q17 fuel injector.

• If the resistance is not between 150-210 kohm replace the appropriate Q17 fuel injector.

7. Test for infinite resistance between each terminal and the Q17 fuel injector housing/case.

• If not the specified value, replace the Q17 fuel injector.
• If within specified value, replace the K20 engine control module.

Component Testing

1. Ignition OFF, disconnect the harness connector at the appropriate Q17 fuel injector.
2. Test for 150-210 kohm between terminal 2 and terminal 1 of the Q17 fuel injector.

• If not within the specified range, replace the appropriate Q17 fuel injector.

3. Test for infinite resistance between each terminal and the Q17 fuel injector housing/case.

• If not the specified value, replace the Q17 fuel injector.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Fuel Injector Replacement (Left Side) (Fuel Injector Replacement (Left Side)) Fuel Injector Replacement (Right Side) (Fuel Injector Replacement (Right Side))
* Perform the Fuel Injector Flow Rate Programming (Procedures) procedure after replacement of a fuel injector.
* Control Module References (Programming and Relearning) for ECM replacement, programming, and setup.

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