DTC Advanced Diagnostics: P0563

DTC P0563:Powertrain Control Module (PCM) Power Source Circuit Unexpected Voltage

General Description

If there is a short to ground in the harness between the powertrain control module (PCM) and PGM-FI main relay 1, PGM-FI main relay 1 stays ON even if the vehicle is turned to the OFF (LOCK) mode, and the PCM remains active. However, the engine is not running because power for the gauges, the ignition, and the fuel pump is turned OFF by the ignition switch. When the PCM operates for a set time after the vehicle is turned to the OFF (LOCK) mode, it detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status

Execution	Continuous
Sequence	None
Duration	5 seconds or more
DTC Type	Two drive cycles, MIL off
OBD Status	PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Enable Conditions

Condition	Minimum	Maximum
12 volt battery voltage [BATTERY] (FI MAIN RLY OUT terminal of PCM)	10.0 V	–

[ ]: HDS Parameter

Malfunction Threshold

The PCM operates for at least 5 seconds after the vehicle is turned to the OFF (LOCK) mode.

Possible Cause

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

	PGM-FI main relay 1 stuck on failure
	PGM-FI main relay 1 FI MAIN RLY CL- line short to ground
	PCM internal circuit failure

Diagnosis Details

Conditions for setting the DTC

When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, a Confirmed DTC and the freeze data are stored. The MIL does not come on.

Conditions for clearing the DTC

The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.