P0203
DTC P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, or P2146-P2157
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* 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
- Injector 1 Control Circuit
DTC P0202
- Injector 2 Control Circuit
DTC P0203
- Injector 3 Control Circuit
DTC P0204
- Injector 4 Control Circuit
DTC P0261
- Injector 1 Control Circuit Low Voltage
DTC P0262
- Injector 1 Control Circuit High Voltage
DTC P0264
- Injector 2 Control Circuit Low Voltage
DTC P0265
- Injector 2 Control Circuit High Voltage
DTC P0267
- Injector 3 Control Circuit Low Voltage
DTC P0268
- Injector 3 Control Circuit High Voltage
DTC P0270
- Injector 4 Control Circuit Low Voltage
DTC P0271
- Injector 4 Control Circuit High Voltage
DTC P2146
- Injector Positive Voltage Control Circuit Group 1
DTC P2149
- Injector Positive Voltage Control Circuit Group 2
DTC P2152
- Injector Positive Voltage Control Circuit Group 3
DTC P2155
- Injector Positive Voltage Control Circuit Group 4
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. When a fuel injector circuit condition is detected by the ECM, the affected fuel injector will be disabled.
Conditions for Running the DTC
* The engine speed is more than 80 RPM.
* The ignition 1 signal parameter is between 8-18.1 volts.
* The DTCs run continuously within the enabling conditions.
Conditions for Setting the DTC
The control module detects an incorrect voltage on the positive voltage circuit or the control circuit for greater than 4 seconds continuously or 50 seconds cumulative.
Action Taken When the DTC Sets
DTCs P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P2146, P2149, P2152, and P2155 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P2146, P2149, P2152, and P2155 are Type B DTCs.
Circuit/System Verification
1. Observe the Misfire Current Counters with a scan tool. The Misfire Current Counters should not be incrementing.
2. Engine operating, observe the DTC information with a scan tool. DTCs P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P2146, P2149, P2152, and P2155 should not set.
Circuit/System Testing
1. Ignition OFF, disconnect the C162 fuel injector multi-way harness connector.
2. Engine cranking, verify that a test lamp flashes brightly between ground and the voltage supply circuit terminal, ECM side of the connector, of the appropriate fuel injector listed below.
* Injector 1 terminal 7
* Injector 2 terminal 8
* Injector 3 terminal 9
* Injector 4 terminal 10
• If the test lamp is always ON, test the appropriate fuel injector voltage supply circuit for a short to voltage. If the circuit tests normal, replace the ECM.
• If the test lamp is always OFF, test the appropriate fuel injector voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
3. Engine cranking, verify that a test lamp flashes dimly between B+ and the control circuit terminal, ECM side of the connector, of the appropriate fuel injector listed below.
* Injector 1 terminal 1
* Injector 2 terminal 2
* Injector 3 terminal 3
* Injector 4 terminal 4
• If the test lamp is always ON, test the appropriate fuel injector control circuit for a short to ground. If the circuit tests normal, replace the ECM.
• If the test lamp is always OFF, test the appropriate fuel injector control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
4. Ignition OFF, test for 1.5-4 ohms of resistance between the appropriate fuel injector voltage supply circuit terminal and the fuel injector control circuit terminal, engine side of the connector, of the appropriate fuel injector listed below.
* Injector 1 terminals 1 and 7
* Injector 2 terminals 2 and 8
* Injector 3 terminals 3 and 9
* Injector 4 terminals 4 and 10
• If the resistance is not within the specified range, test for a short to ground or an open/high resistance between C162 and the appropriate fuel injector harness connector. If the circuits test normal, test or replace the fuel injector.
Component Testing
Static Test
1. Test for 1.5 ohms plus/minus 0.15 ohm at 20°C (68°F) of resistance between the positive voltage circuit terminal 2 and the control circuit terminal 1 at the fuel injector.
• If not within the specified range, replace the fuel injector.
2. Test for infinite resistance between each terminal and the fuel injector housing/case.
• If not the specified value, replace the fuel injector.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Refer to Programming and Relearning for ECM setup and programming. Programming and Relearning
* Direct Fuel Injector Replacement