P263A
DTC P0650, P263A, or P263B
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 P0650
- Malfunction Indicator Lamp (MIL) Control Circuit Open
DTC P263A
- Malfunction Indicator Lamp (MIL) Control Circuit Low Voltage
DTC P263B
- Malfunction Indicator Lamp (MIL) Control Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
The malfunction indicator lamp (MIL) illuminates to inform the driver that an emission system fault has occurred and the engine control system requires service. Ignition voltage is supplied directly to the MIL and, when the emission system fault occurs, the engine control module (ECM) turns the MIL ON by grounding the MIL control circuit. Under normal operating conditions, the MIL should be ON only when the ignition is ON and the engine is OFF.
Conditions for Running the DTC
* The engine speed is greater than 80 RPM.
* The ignition voltage is between 11-32 V.
* The DTCs run continuously when the above conditions are met.
Conditions for Setting the DTC
DTC P0650
The ECM detects low voltage during the MIL control circuit driver OFF state.
DTC P263A
The ECM detects low voltage during the MIL control circuit driver OFF state.
DTC P263B
The ECM detects high voltage on the MIL control circuit during the driver ON state.
Action Taken When the DTC Sets
* DTC P0650 is a Type B DTC.
* DTC P263A is a Type B DTC.
* DTC P263B is a Type B DTC.
Conditions for Clearing the DTC
* DTC P0650 is a Type B DTC.
* DTC P263A is a Type B DTC.
* DTC P263B is a Type B DTC.
Diagnostic Aids
* If the condition is intermittent, move the related harnesses and connectors with the ignition ON and the engine OFF, and with the engine operating while monitoring the scan tool MIL control circuit status parameters. The MIL control circuit status parameters will change from OK or Not Run to Fault if there is a condition with the circuit or a connection.
* If the ECM detects low voltage on the MIL control circuit during the MIL control circuit driver OFF state, DTCs P0650 and DTC P263A may set simultaneously.
Reference Information
Schematic Reference
* Engine Controls Schematics [1][2]Electrical Diagrams
* Instrument Cluster Schematics Instrument Cluster Schematics
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
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. Ignition ON, command the malfunction indicator lamp ON and OFF with a scan tool.
2. Verify that the malfunction indicator lamp turns ON and OFF as commanded.
• If the malfunction indicator lamp does not turn ON and OFF as commanded Refer to Circuit/System Testing
• If the malfunction indicator lamp turns ON and OFF as commanded
3. Ignition ON, command the malfunction indicator lamp ON and OFF with a scan tool.
4. Verify that the control circuit status parameters listed below display OK or Not Run
1. The MIL Control Circuit Low Voltage Test Status
2. The MIL Control Circuit Open Test Status
3. The MIL Control Circuit High Voltage Test Status
• If Malfunction is displayed Refer to Circuit/System Testing
• If OK or Not Run is displayed
5. Engine running, command the malfunction indicator lamp ON and OFF with a scan tool.
6. Verify that the control circuit status parameters listed below display OK or Not Run
1. The MIL Control Circuit Low Voltage Test Status
2. The MIL Control Circuit Open Test Status
3. The MIL Control Circuit High Voltage Test Status
• If Malfunction is displayed Refer to Circuit/System Testing
• If OK or Not Run is displayed
7. 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 any DTC sets Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
• If a DTC does not set
8. All OK.
Circuit/System Testing
1. Ignition OFF.
2. Disconnect the X1 harness connector at the K20 engine control module.
3. Ignition ON, verify the malfunction indicator lamp does not illuminate.
• If the malfunction indicator lamp illuminates
1. Test for infinite resistance between the malfunction indicator lamp control circuit terminal 1 X1 and ground.
• If less than infinite resistance, repair the short to ground in the circuit.
• If infinite resistance, replace the P16 instrument cluster.
• If the malfunction indicator lamp does not illuminate
4. Connect a 3 A fused jumper wire between the malfunction indicator lamp control circuit terminal 1 X1 and ground.
5. Verify the malfunction indicator lamp illuminates.
• If the malfunction indicator lamp does not illuminate
1. Test the malfunction indicator lamp control circuit terminal 1 X1 for a short to voltage or an open/high resistance.
• If the malfunction indicator lamp control circuit terminal 1 X1 is shorted to voltage or has an open/high resistance, repair as necessary.
• If the malfunction indicator lamp control circuit terminal 1 X1 tests normal
2. Test the instrument cluster ignition voltage circuit for a short to ground or open/high resistance.
• If the instrument cluster ignition voltage circuit is shorted to ground or has an open/high resistance, repair as necessary.
• If the instrument cluster ignition voltage circuit tests normal, replace the P16 instrument panel cluster/bulb.
• If the malfunction indicator lamp illuminates
6. Replace the K20 engine control module.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Instrument Cluster Replacement Service and Repair
* Control Module References Control Module References for engine control module replacement, setup, and programming