P20CD
DTC P10CD, P10CE, P20CD, or P20CE
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 Descriptor
DTC P10CD
- Exhaust Aftertreatment Fuel Injector High Control Circuit Low Voltage
DTC P10CE
- Exhaust Aftertreatment Fuel Injector High Control Circuit High Voltage
DTC P20CD
- Exhaust Aftertreatment Fuel Injector Control Circuit Low Voltage
DTC P20CE
- Exhaust Aftertreatment Fuel Injector Control Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
The engine control module (ECM) supplies power and ground to the high and low control circuits of the exhaust aftertreatment fuel injector or indirect fuel injector. When the ECM detects a fault on either of the exhaust aftertreatment fuel injector circuits it sets a DTC.
Conditions for Running the DTC
* Battery Voltage is greater than 11 V.
* Engine speed is greater than 600 RPM.
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.
* The condition exists for more than 3 s.
Action Taken When the DTC Sets
DTC P10CC, P20CB, P20CD and P20CE are Type B DTCs.
Conditions for Clearing the DTC
DTC P10CC, P20CB, P20CD and P20CE are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
Description and Operation
Exhaust Aftertreatment System Description Exhaust Aftertreatment 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 Control Module References for scan tool information
Circuit/System Verification
1. Engine running.
2. Observe the following control circuit parameters with a scan tool:
Each parameter should display OK or Not Run.
* Exh Aftrtmnt Fuel Inj High Ctrl Ckt Short Volts Test Status
* Exh Aftrtmnt Fuel Inj High Ctrl Ckt Short Gnd Test Status
* Exh Aftrtmnt Fuel Inj Ctrl Ckt Shorted Test Status
* Exh Aftrtmnt Fuel Inj Ctrl Ckt Open Test Status
• If any parameter does not display OK or Not Run
Refer to Circuit/System Testing.
• If all the parameters display OK or Not Run
3. Ignition ON.
4. Command the Exh. Aftertreatment Fuel Injector to 50 %. Verify an audible click at the Q57 Exhaust Aftertreatment Fuel Injector.
• If no audible click is heard
Refer to Circuit/System Testing.
• If audible click is heard
5. 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
6. All OK.
Circuit/System Testing
Note: Poor fuel supply could over heat and damage the exhaust aftertreatment fuel injector.
1. Ignition OFF.
2. Disconnect the harness connector at the Q57 Exhaust Aftertreatment Fuel Injector.
3. Ignition ON.
4. Command the Exhaust Aftertreatment Fuel Injector to 90 % with a scan tool, verify a test lamp flashes ON and OFF between the high control circuit terminal 2 and ground.
• If the test lamp remains illuminated
Test the high control circuit for a short to B+. If the circuit tests normal, replace the K20 engine control module.
• If the test lamp does not flash ON and OFF
Test the high control circuit for an open/high resistance or short to ground, If the circuit tests normal, replace the K20 engine control module.
• If the test lamp flashes ON and OFF
5. Command the Exhaust Aftertreatment Fuel Injector to 90 % with a scan tool, verify a test lamp flashes ON and OFF between the high control circuit terminal 2 and the low control circuit terminal 1.
• If the test lamp does not flash ON and OFF
Test the low control circuit for an open/high resistance or short to B+, If the circuit tests normal, replace the K20 engine control module.
• If the test lamp flashes ON and OFF
6. Refer to Component Testing.
Component Testing
Static Testing
1. Ignition OFF.
2. Disconnect the harness connector at the Q57 Exhaust Aftertreatment Fuel Injector.
3. Test for 10.7-13.3 ohms between the control terminal 1 and the control terminal 2 of the Exhaust Aftertreatment Fuel Injector.
• If not within 10.7-13.3 ohms
Replace the Q57 Exhaust Aftertreatment Fuel Injector.
• If within 10.7-13.3 ohms
4. Test for infinite resistance between each terminal and the Q57 Exhaust Aftertreatment Fuel Injector housing/case.
• If not infinite resistance
Replace the Q57 Exhaust Aftertreatment Fuel Injector.
• If infinite resistance
5. Perform Dynamic Testing.
Dynamic Testing
1. Verify the flow rate of the Q57 Exhaust Aftertreatment Fuel Injector, refer to Exhaust Aftertreatment Fuel Injector Diagnosis Testing and Inspection.
• If not within specified value
Replace the Q57 Exhaust Aftertreatment Fuel Injector.
• If within the specified value
2. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Indirect Fuel Injector Replacement Service and Repair for Exhaust Aftertreatment Fuel Injector replacement.
* Control Module References Control Module References for ECM replacement, programming, and setup.