P1233 code
- Thread starter Andymay79
- Start date
DTC P1224, P1227, P122A, P1233, P1236, P1239, P1242, or P1247
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 P1224Fuel Injector 1 Control Circuit Shorted
DTC P1227Fuel Injector 2 Control Circuit Shorted
DTC P122AFuel Injector 3 Control Circuit Shorted
DTC P1233Fuel Injector 4 Control Circuit Shorted
DTC P1236Fuel Injector 5 Control Circuit Shorted
DTC P1239Fuel Injector 6 Control Circuit Shorted
DTC P1242Fuel Injector 7 Control Circuit Shorted
DTC P1247Fuel Injector 8 Control Circuit Shorted
Diagnostic Fault Information
Fuel Injector Circuits
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance
Direct Fuel Injector (DFI) High Voltage Control Cylinder 1
P2146
P0201¹
P1224
P0263
Direct Fuel Injector (DFI) High Voltage Control Cylinder 2
P2152
P0202¹
P1227
P0266
Direct Fuel Injector (DFI) High Voltage Control Cylinder 3
P2155
P0203¹
P122A
P0269
Direct Fuel Injector (DFI) High Voltage Control Cylinder 4
P2146
P0204¹
P1233
P0272
Direct Fuel Injector (DFI) High Voltage Control Cylinder 5
P2152
P0205¹
P1236
P0275
Direct Fuel Injector (DFI) High Voltage Control Cylinder 6
P2149
P0206¹
P1239
P0278
Direct Fuel Injector (DFI) High Voltage Control Cylinder 7
P2149
P0207¹
P1242
P0281
Direct Fuel Injector (DFI) High Voltage Control Cylinder 8
P2155
P0208¹
P1247
P0284
¹ Misfire DTCs may also set.
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
•Engine speed is greater than 600 RPM.
•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 high voltage control circuit.
•The condition exists for less than 1 s.
Action Taken When the DTC Sets
DTCs P1224, P1227, P122A, P1233, P1236, P1239, P1242 and P1247 are Type A DTCs.
Conditions for Clearing the MIL/DTC
DTCs P1224, P1227, P122A, P1233, P1236, P1239, P1242 and P1247 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
Connector End View Reference
Component Connector End Views
Description and Operation
Fuel System Description
Electrical Information Reference
•Circuit Testing
•Connector Repairs
•Testing for Intermittent Conditions and Poor Connections
•Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
1. Engine Running.
2. Observe the following scan tool parameters.
Each parameter should display OK or Not Run.
◦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
⇒ If any parameters do not display OK or Not Run
Refer to Circuit/System Testing.
⇓ If all parameters display OK or Not Run
3. 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.
⇒ If DTC resets
Refer to Circuit/System Testing.
⇓ If DTC does not reset
4. All OK.
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.
1. Observe the DTC information with a scan tool. If DTC P2146, P2149, P2152 or P2155 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle.
2. Ignition OFF.
3. Disconnect the appropriate harness connector at the Q17 fuel injector.
4. Ignition ON.
5. Test for less than 1 V between the appropriate Direct Fuel Injector (DFI) High Voltage Control circuit terminal 2 and ground.
⇒ If greater than 1 V
Repair the short to voltage in the appropriate Direct Fuel Injector (DFI) High Voltage Control circuit.
⇓ If less than 1 V
6. Ignition OFF.
7. Test for 150–210 kΩ between terminal 1 and terminal 2 of the appropriate Q17 fuel injector.
⇒ If not between 150 and 210 kΩ
Replace the appropriate Q17 fuel injector.
⇓ If between 150 and 210 kΩ
8. Test for infinite resistance between each terminal and the Q17 fuel injector housing/case.
⇒ If not infinite resistance
Replace the Q17 Fuel Injector .
⇓ If infinite resistance
9. Replace the K20 engine control module.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, programming, and setup
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 P1224Fuel Injector 1 Control Circuit Shorted
DTC P1227Fuel Injector 2 Control Circuit Shorted
DTC P122AFuel Injector 3 Control Circuit Shorted
DTC P1233Fuel Injector 4 Control Circuit Shorted
DTC P1236Fuel Injector 5 Control Circuit Shorted
DTC P1239Fuel Injector 6 Control Circuit Shorted
DTC P1242Fuel Injector 7 Control Circuit Shorted
DTC P1247Fuel Injector 8 Control Circuit Shorted
Diagnostic Fault Information
Fuel Injector Circuits
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance
Direct Fuel Injector (DFI) High Voltage Control Cylinder 1
P2146
P0201¹
P1224
P0263
Direct Fuel Injector (DFI) High Voltage Control Cylinder 2
P2152
P0202¹
P1227
P0266
Direct Fuel Injector (DFI) High Voltage Control Cylinder 3
P2155
P0203¹
P122A
P0269
Direct Fuel Injector (DFI) High Voltage Control Cylinder 4
P2146
P0204¹
P1233
P0272
Direct Fuel Injector (DFI) High Voltage Control Cylinder 5
P2152
P0205¹
P1236
P0275
Direct Fuel Injector (DFI) High Voltage Control Cylinder 6
P2149
P0206¹
P1239
P0278
Direct Fuel Injector (DFI) High Voltage Control Cylinder 7
P2149
P0207¹
P1242
P0281
Direct Fuel Injector (DFI) High Voltage Control Cylinder 8
P2155
P0208¹
P1247
P0284
¹ Misfire DTCs may also set.
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
•Engine speed is greater than 600 RPM.
•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 high voltage control circuit.
•The condition exists for less than 1 s.
Action Taken When the DTC Sets
DTCs P1224, P1227, P122A, P1233, P1236, P1239, P1242 and P1247 are Type A DTCs.
Conditions for Clearing the MIL/DTC
DTCs P1224, P1227, P122A, P1233, P1236, P1239, P1242 and P1247 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
Connector End View Reference
Component Connector End Views
Description and Operation
Fuel System Description
Electrical Information Reference
•Circuit Testing
•Connector Repairs
•Testing for Intermittent Conditions and Poor Connections
•Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
1. Engine Running.
2. Observe the following scan tool parameters.
Each parameter should display OK or Not Run.
◦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
⇒ If any parameters do not display OK or Not Run
Refer to Circuit/System Testing.
⇓ If all parameters display OK or Not Run
3. 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.
⇒ If DTC resets
Refer to Circuit/System Testing.
⇓ If DTC does not reset
4. All OK.
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.
1. Observe the DTC information with a scan tool. If DTC P2146, P2149, P2152 or P2155 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle.
2. Ignition OFF.
3. Disconnect the appropriate harness connector at the Q17 fuel injector.
4. Ignition ON.
5. Test for less than 1 V between the appropriate Direct Fuel Injector (DFI) High Voltage Control circuit terminal 2 and ground.
⇒ If greater than 1 V
Repair the short to voltage in the appropriate Direct Fuel Injector (DFI) High Voltage Control circuit.
⇓ If less than 1 V
6. Ignition OFF.
7. Test for 150–210 kΩ between terminal 1 and terminal 2 of the appropriate Q17 fuel injector.
⇒ If not between 150 and 210 kΩ
Replace the appropriate Q17 fuel injector.
⇓ If between 150 and 210 kΩ
8. Test for infinite resistance between each terminal and the Q17 fuel injector housing/case.
⇒ If not infinite resistance
Replace the Q17 Fuel Injector .
⇓ If infinite resistance
9. Replace the K20 engine control module.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, programming, and setup