GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Epica 🢒 Engine 🢒 Engine Controls - 2.5L (LBK) 🢒 DTC P1563

Circuit Description

The engine control module (ECM) uses the ignition 1 voltage circuit to monitor system voltage. Voltage that is out of range will cause damage to components and incorrect input readings. If the ECM detects an excessively high system voltage, this DTC sets.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P1563 System Voltage High

Conditions for Running the DTC
    • The ignition is ON or the engine is running.
    • DTC P1563 runs continuously once the above condition is met.

Conditions for Setting the DTC

The ECM detects a system voltage more than 16 volts for more than 5 minutes.

Step

Action

Values

Yes

No

Schematic Reference: Engine Controls Schematics

Connector End View Reference: Engine Controls Connector End Views or Engine Control Module Connector End Views

1

Did you perform the Diagnostic System Check - Engine Controls?

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Go to Step 2

Go to Diagnostic System Check - Engine Controls

2
  1. Start the engine.
  2. Clear the DTC with a scan tool.
  3. Raise the engine speed above 1,500 RPM.

Does DTC P1563 set?

--

Go to Step 4

Go to Step 3

3
  1. Observe the Freeze Frame/Failure Records data for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

Did the DTC fail this ignition?

--

Go to Step 4

Go to Intermittent Conditions

4
  1. Measure the voltage at the battery with a DMM.
  2. Raise the engine speed above 1,500 RPM.

Is the battery voltage less than the specified value?

16 V

Go to Step 5

Go to Charging System Test in Engine Electrical

5

Replace the ECM. Refer to Engine Control Module Replacement .

Is the replacement complete?

--

Go to Step 6

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6
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

Did the DTC fail this ignition?

--

Go to Step 2

Go to Step 7

7

Observe the Capture Info with a scan tool.

Are there any DTCs that have not been diagnosed?

--

Go to Diagnostic Trouble Code (DTC) List

System OK