Engine Electrical

DTC P0562

DTC Descriptor

DTC P0562

- System Voltage Low

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview






Circuit/System Description

The engine control module (ECM)/powertrain control module (PCM) 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 volts.

Conditions for Setting the DTC

The ECM/PCM detects a system voltage below 10.5 volts for 5 seconds.

Action Taken When the DTC Sets

* The ECM/PCM will not illuminate the charge indicator.
* The ECM/PCM will not illuminate the malfunction indicator lamp (MIL).
* The ECM/PCM will store conditions, which were present when the DTC set as Fail Records data only.

Conditions for Clearing the DTC

* The ECM/PCM will command the message OFF after one trip in which the diagnostic test has been run and passed.
* The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.

Circuit/System Verification

With the scan tool installed, ignition ON and the engine OFF, observe the Ignition 1 Signal parameter in the ECM/PCM data list. The Ignition 1 Signal parameter should read 10.5 volts or greater.

Circuit/System Testing

1. Measure the voltage at the battery terminals and compare it with the Ignition 1 Signal parameter in the ECM/PCM data list. Verify that battery and Ignition 1 signal readings do not differ more than 1 volt.

• If greater than 1 volt test the Ignition 1, ground circuits of the ECM/PCM for open/high resistance or replace the ECM/PCM.

2. Go to Charging System Test. Charging System Test

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

Control Module References for ECM/PCM replacement, setup, and programming