P263B
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. The engine control module (ECM) turns the MIL ON by grounding the MIL control circuit when the emission system fault occurs. 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, P263A, and P263B are Type B DTCs
Conditions for Clearing the DTC
DTC P0650, P263A, and P263B are Type B DTCs
Diagnostic Aids
* If the condition is intermittent, move the related harnesses and connectors while monitoring the scan tool MIL control circuit status parameters. Perform this test with the ignition ON and the engine OFF, and with the engine running. The MIL control circuit status parameters change from OK or Not Run to Fault if there is a condition with a circuit or a connection.
* If the ECM detects low voltage on the MIL control circuit during the control circuit driver OFF state, DTCs P0650 and DTC P263A may set simultaneously.
Reference Information
Schematic Reference
* Engine Controls Schematics (LHU) [1][2]Electrical Diagrams
* Instrument Cluster Schematics Instrument Cluster Schematics
Connector End View Reference
Component Connector End Views Sunshade - Left
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
* The MIL Control Circuit Low Voltage Test Status
* The MIL Control Circuit Open Test Status
* 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
* The MIL Control Circuit Low Voltage Test Status
* The MIL Control Circuit Open Test Status
* 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. 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 X1 46 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 X1 46 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 X1 46 for a short to voltage or an open/high resistance.
• If the malfunction indicator lamp control circuit terminal X1 46 is shorted to voltage or has an open/high resistance, repair as necessary.
• If the malfunction indicator lamp control circuit terminal X1 46 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 repair.
* Instrument Cluster Replacement Instrument Cluster Replacement
* Control Module References Control Module References for engine control module replacement, programming, and setup.