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 P0562: System Voltage Low

### Diagnostic Fault Information

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

### 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 below 10 V for 5 seconds.

### Action Taken When the DTC Sets

The instrument panel cluster (IPC) illuminates the charge indicator.

### Conditions for Clearing the DTC

DTC P0562 is a C type DTC.

### Diagnostic Aids

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

• | A low voltage value in multiple modules indicates a concern in the charging system.

### Reference Information

#### Schematic Reference

Engine Controls Schematics for the 2.0L engine

#### 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 measure and record the voltage at the battery terminals. Verify that the battery voltage is 12.6-15.5 V.

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

2. Observe the scan tool ECM Ignition 1 Signal parameter. The reading should be between 12.6 and 15.5 V.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connectors at the ECM.
2. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 Ω between the ground circuit terminals listed below and ground.

• | Terminal 1 X2

• | Terminal 2 X2

• | Terminal 4 X2

⇒ | If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between the B+/ignition circuit terminals listed below and ground.

• | IGN Terminal 3 X2

• | IGN Terminal 5 X2

• | IGN Terminal 6 X2

• | IGN Terminal 54 X2

• | B+ Terminal 56 X2

⇒ | If the test lamp does not illuminate , test the B+/Ignition circuits for a short to ground or an open/high resistance.

4. If all the 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