P0201
DTC P0201-P0204
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
-
Cylinder 1 Injector Control Circuit
DTC P0202
-
Cylinder 2 Injector Control Circuit
DTC P0203
-
Cylinder 3 Injector Control Circuit
DTC P0204
-
Cylinder 4 Injector Control Circuit
Diagnostic Fault Information
Circuit/System Description
The control module enables the appropriate fuel injector pulse for each cylinder. Ignition voltage is supplied to the fuel injectors. The control module controls each fuel injector by grounding the control circuit via a solid state device called a driver. The control module monitors the status of each driver. If the control module detects an incorrect voltage for the commanded state of the driver, a fuel injector control circuit DTC sets.
Conditions for Running the DTC
* DTCs P0607, P0628, P0629 are not set.
* The battery voltage is between 11-32 V.
* The engine is running.
* The engine speed is between 320-6.016 RPM.
* All fuel injectors are active.
* These DTCs run continuously when the above conditions are met.
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 above condition is met for 3.2 s.
Action Taken When the DTC Sets
DTCs P0201, P0202, P0203, P0204 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0201, P0202, P0203, P0204, are Type B DTCs.
Diagnostic Aids
* Performing the Fuel Injector Diagnosis may help isolate an intermittent condition. Refer to Fuel Injector Diagnosis Fuel Injector Diagnosis.
* The MIL indicator flashes if there is a engine misfire because of a catalyst damage.
* High resistance in the circuits of the injectors may set a misfire DTC without setting an injector DTC. Test the injector circuits of the affected cylinder for a high resistance if you suspect a condition.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
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 Control Module References for scan tool information
Circuit/System Verification
Note:
If you were sent here from DTC P0300 proceed to Circuit/System Testing.
1. Engine running, observe the following control circuit status parameters:
* Cylinder 1-4 Injector Control Circuit Low Voltage Test Status
* Cylinder 1-4 Injector Control Circuit Open Test Status
* Cylinder 1-4 Injector Control Circuit High Voltage Test Status
* Each parameter should toggle between OK and Not Run or Not Run and OK
2. Engine running, observe the DTC information with a scan tool. DTCs P0201, P0202, P0203, or P0204 should not set.
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.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate Q17 Fuel Injector.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.
• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test or replace the appropriate Q17 Fuel Injector and replace the fuse.
3. Test for 2.5-3.5 V between the K20 Engine Control Module control circuit terminal 2 and ground
• If less than the specified range, test the K20 Engine Control Module control circuit for a short to ground or an open high resistance. If circuit tests normal, replace the K20 Engine Control Module.
• If greater than the specified range, test the K20 Engine Control Module control circuit for a short to voltage. If circuit tests normal, replace the K20 Engine Control Module.
4. Ignition OFF, connect a test lamp between the K20 Engine Control Module control circuit terminal 2 and the ignition voltage circuit terminal 1.
5. Engine idling, the test lamp should flash.
• If the test lamp does not flash, test the fuel injector circuits for a high resistance. If circuits test normal, replace the K20 Engine Control Module.
6. If all circuits test normal, test or replace the appropriate Q17 Fuel Injector.
Component Testing
Static Test
1. Ignition OFF, disconnect the harness connector at the appropriate Q17 Fuel Injector.
Note:
The engine coolant temperature (ECT) sensor must be between 10-32°C (50-90°F) in order for an accurate measurement.
2. Test for 11-14 ohms between the appropriate Q17 Fuel Injector ignition voltage terminal 1 and the K20 Engine Control Module control circuit terminal 2.
• If not within the specified range, replace the appropriate Q17 Fuel Injector.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Fuel Injector Replacement Service and Repair
* Control Module References Control Module References for ECM replacement, programming, and setup