DTC P0650 or P1650. Chevrolet Joy 2008

For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptors

DTC P0650: Malfunction Indicator Lamp (MIL) Control Circuit Low Voltage
DTC P1650: Malfunction Indicator Lamp (MIL) Control Circuit High Voltage

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
MIL Voltage Supply | P0650 | P0650 | -- | --
MIL Control | P0650/MIL ON | P0650 | P1650 | --

### Circuit/System Description

The malfunction indicator lamp (MIL) is located on the instrument panel cluster (IPC). The MIL informs the driver that an emission system fault has occurred and that the engine control system requires service. The control module monitors the MIL control circuit for conditions that are incorrect for the commanded states of the MIL.

### Conditions for Running the DTC

• | The ignition is ON or the engine is running.

• | The DTCs runs continuously once the above conditions are met.

### Conditions for Setting the DTC

#### P0650

The engine control module (ECM) detects the MIL control circuit is open or shorted to ground.

#### P1650

The ECM detects the MIL control circuit is shorted to voltage.

### Action Taken When the DTC Sets

DTC P0650 and P1650 are Type B DTCs.

### Conditions for Clearing the DTC

DTC P0650 and P1650 are Type B DTCs.

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

#### Scan Tool Reference

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 when commanded.
2. 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. If any other IPC indicators or gages are inoperative, refer to Symptoms - Displays and Gages.
2. Ignition OFF, disconnect the ECM harness connector.
3. Ignition ON, install a 3A fused jumper wire between the control circuit terminal 39 and ground. The MIL should illuminate.

⇒ | If the MIL does not illuminate, test the control circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the IPC/bulb.

4. If all circuits test normal, test or replace the ECM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Instrument Cluster Replacement

• | Control Module References for ECM replacement, setup, and programming