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 P0658 00: Actuator High Control Circuit Group 1 Low Voltage
DTC P0659 00: Actuator High Control Circuit Group 1 High Voltage

### Circuit/System Description

These DTC apply to internal 5 V reference voltage supply within the engine control module (ECM).

### Conditions for Running the DTC

• | The ignition is ON.

• | The DTCs run continuously once the above condition is met.

### Conditions for Setting the DTC

#### P0658

The internal 5 V reference voltage is to low.

#### P0658

The internal 5 V reference voltage is to high.

### Action Taken When the DTC Sets

DTC P0658 and P0659 are Type C DTCs.

### Conditions for Clearing the DTC

DTC P0658 and P0659 are Type C DTCs.

### Reference Information

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

### Circuit/System Testing

1. Observe the Freeze Frame/Failure Records with a scan tool.
2. Clear the DTCs with a scan tool.
3. Ignition OFF for 30 s.
4. 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.

⇒ | If DTC P0658 or P0659 is reset this ignition, replace the K20 Engine Control Module (ECM).

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming