For 1990-2009 cars only
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 LowDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Ignition 1 Signal | P0562 | P0562 | -- | -- |
Circuit/System Description
The engine control module (ECM) monitors the ignition voltage on the ignition feed circuit to terminal 39 at the ECM. A system voltage DTC will set whenever the voltage is below a calibrated value.
Conditions for Running the DTC
Engine running time is greater than 120 seconds.
Conditions for Setting the DTC
System voltage is between 2.48-10.01 volts.
Action Taken When the DTC Sets
| • | The malfunction indicator lamp MIL will be illuminated after 3 valid driving cycles. |
| • | The ECM will record operating conditions at the time of the diagnostic failure. This information will be stored in the Freeze Frame and Failure Records buffers. |
| • | A history DTC is stored. |
Conditions for Clearing The MIL/DTC
| • | The MIL will turn OFF after 3 or 4 consecutive driving cycles in which the diagnostic runs without a fault. |
| • | A history DTC will clear after 40 consecutive warm up cycles without a fault. |
| • | DTCs can be cleared by using the scan tool. |
| • | Disconnecting the ECM battery feed for 10 seconds |
Circuit/System Verification
With the scan tool installed, ignition ON and the engine OFF, observe the Ignition 1 Signal parameter in the ECM data list. The Ignition 1 Signal parameter should read 10.5 volts or greater.
Circuit/System Testing
- Measure the voltage at the battery terminals and compare it with the Ignition 1 Signal parameter in the ECM data list. Verify that battery and Ignition 1 signal readings do not differ more than 1 volt.
- Refer to Charging System Test .
| ⇒ | If greater than 1 volt test the ignition 1, ground circuits of the ECM for open/high resistance or replace the ECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, setup, and programming
