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 Descriptor

DTC P0563: System Voltage High - ECM

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
B+ | P0562 | P0562 | -- | --
Ground | -- | P0562 | -- | --

### Circuit/System Description

The engine control module (ECM) monitors the battery 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 engine is running.

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

### Conditions for Setting the DTC

The ECM detects that the system voltage is greater than 16 V for 1 second.

### Action Taken When the DTC Sets

• | The charge indicator turns ON.

• | The ECM will not illuminate the malfunction indicator lamp (MIL).

• | The ECM will store conditions, which were present when the DTC set as Fail Records data only.

### Conditions for Clearing the DTC

• | The ECM will command the indicator OFF after one trip in which the diagnostic test has been run and passed.

• | A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.

### Diagnostic Aids

• | A high voltage DTC in multiple modules indicates a concern in the charging system.

• | This DTC could be set by overcharging with a battery charger or jump starting.

### Reference Information

#### Schematic Reference

• | Engine Controls Schematics for the 2.0L (LNF) engine

• | Engine Controls Schematics for the 2.2L (L61) and 2.4L (LE5) engines

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Charging System Description and Operation

#### 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. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 V.

⇒ | If not within the specified range, refer to Charging System Test.

2. If all circuits test normal, replace the ECM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming.