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 - 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) is supplied voltage by either the ECM/TRANS fuse, or the ECM/TCM fuse, depending on vehicle options. The ECM monitors the battery voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur if the voltage is out of range.

### Conditions for Running the DTC

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

• | Engine speed is above 600 RPM

### Conditions for Setting the DTC

The ECM detects that the battery voltage is less than 10 V for 6 seconds.

### Action Taken When the DTC Sets

The charge indicator turns ON.

### Conditions for Clearing the DTC

• | The ECM will command the message 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 low voltage DTC in multiple modules indicates a concern in the charging system.

### 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 Testing

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. Ignition OFF, disconnect the harness connectors at the ECM.
3. 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 (LNF)

• | Terminal 2 X2 (LNF)

• | Terminal 4 X2 (LNF)

• | Terminal 73 X2 (L61/LE5)

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

4. Verify that a test lamp illuminates between the B+ circuit terminals listed below and ground.

• | Terminal 56 X2 (LNF)

• | Terminal 20 X1 (L61/LE5)

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

5. 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.