P0650
DTC P0650
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
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 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
* DTCs P0601, P0604, P0605, P0606, P0607, and P2610 are not set
* The DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
* The ECM detects that the commanded state of the MIL driver and the actual state of the control circuit do not match for more than 1 s.
* Should a short circuit to B+ or an open circuit occur on the MIL control circuit, the MIL must be commanded ON for the DTC to set. A short circuit to ground on the MIL control circuit can be detected immediately by the ECM in the commanded OFF state.
Action Taken When the DTC Sets
DTC P0650 is a Type B DTC, with no MIL request.
Conditions for Clearing the DTC
DTC P0650 is a Type B DTC, with no MIL request.
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 Malfunction if there is a condition with the circuit or a connection
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 Sunshade - Left (D61)
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 and 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
4. Engine running, command the malfunction indicator lamp ON and OFF with a scan tool and 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. 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 the DTC sets
Refer to Circuit/System Testing
• If the DTC does not set
6. 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 52 X1 and ground.
• If less than infinite resistance, repair the short to ground in the circuit.
• If resistance is infinite, 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 52 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 52 X1 for a short to voltage or an open/high resistance.
• If the malfunction indicator lamp control circuit terminal 52 X1 is shorted to voltage or has an open/high resistance, repair as necessary.
• If the malfunction indicator lamp control circuit terminal 52 X1 tests normal
2. Test the instrument cluster ignition voltage circuit for a short to ground or an 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 ECM replacement, programming and setup