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
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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
* The engine speed is greater than 80 RPM.
* The ignition voltage is between 11-32 V.
* The DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
The ECM detects an open, a short to ground, or a short to voltage on the circuit that controls the MIL.
Action Taken When the DTC Sets
DTC P0650 is a Type B DTC.
Conditions for Clearing the DTC
DTC P0650 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 Malfunction if there is a condition with the circuit or a connection.
Reference Information
Schematic Reference
* Engine Controls Schematics (LE9) [1][2]Electrical Diagrams
* Instrument Cluster Schematics Instrument Cluster Schematics
Connector End View Reference
Component Connector End Views Sunshade - Left (DH6)
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 MIL ON and OFF with a scan tool. The MIL should turn ON and OFF as commanded.
2. Command the MIL ON and OFF with a scan tool while observing the following control circuit status parameters:
* The MIL Control Circuit Low Voltage Test Status
* The MIL Control Circuit Open Test Status
* The MIL Control Circuit High Voltage Test Status
Each parameter should display OK or Not Run.
3. Engine running, command the MIL ON and OFF with a scan tool while observing the following control circuit status parameters:
* The MIL Control Circuit Low Voltage Test Status
* The MIL Control Circuit Open Test Status
* The MIL Control Circuit High Voltage Test Status
Each parameter should display OK or Not Run.
4. 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 X1 harness connector at the K20 ECM.
2. Ignition ON, the MIL should not illuminate.
• If the MIL is illuminated, test the MIL control circuit terminal 52 X1 for a short to ground. If the circuit tests normal, replace the P16 instrument cluster.
3. Connect a 3 A fused jumper wire between the MIL control circuit terminal 52 X1 and ground. The MIL should illuminate.
• If the MIL illuminates, replace the K20 ECM.
• If the MIL does not illuminate, test the MIL control circuit terminal 52 X1 for a short to voltage or an open/high resistance. If the MIL control circuit tests normal, test the instrument cluster ignition voltage circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the P16 instrument panel cluster/bulb.
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