For 1990-2009 cars

## DTC P0563 ECM

### 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 Descriptor

DTC P0563: System Voltage High Input

### Circuit/System Description

The engine control module (ECM) monitors the system voltage to ensure that the voltage stays within the proper range. Damage to components and incorrect data may occur when the voltage is out of range.

### Conditions for Running the DTC

• | The vehicle speed is above 8 km/h (5 mph).

• | The system voltage is between 9.5-18 V.

### Conditions for Setting the DTC

The ECM detects a system voltage above 16 V.

### Action Taken when the DTC Sets

DTC P0563 is a type C Store Only DTC.

### Conditions for Clearing the MIL/DTC

DTC P0563 is a type C Store Only DTC.

### Reference Information

#### Schematic Reference

Starting and Charging Schematics

#### Connector End View Reference

Component Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

• | Charging System Test

#### Scan Tool Reference

Control Module References

### Diagnostic Aids

A possible cause of this DTC may be overcharging with a battery charger or jump starting.

### Circuit/System Verification

Ignition ON, engine OFF, observe the Ignition voltage signal parameter in the ECM data list. The Ignition voltage signal parameter should read less than 16 V.

### Circuit/System Testing

1. Measure the battery voltage and compare it with the Ignition circuit signal parameter in the ECM data list. Verify that battery and Ignition voltage signal readings do not differ more than 1 V.

⇒ | If greater than 1 V test the ignition circuit of the ECM for short to voltage or an open/high resistance, if the circuit tests normal replace the ECM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.