Advanced Diagnostics

Advanced Diagnostics - DTC P0563: Engine Control Module (ECM)/Powertrain Control Module (PCM) Power Source Circuit Unexpected Voltage (Engine Type: R18Z1, R18A9)

General Description






If there is a short to ground in the harness between the engine control module (ECM)/powertrain control module (PCM) and PGM-FI main relay 1, PGM-FI main relay 1 stays ON even if the ignition switch is turned to LOCK (0), and the ECM/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 ECM/PCM operates for a set time after the ignition switch is turned to LOCK (0), it detects a malfunction and stores a DTC.

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






Enable Conditions






Malfunction Threshold
The ECM/PCM operates for at least 5 seconds after the ignition switch is turned to LOCK (0).

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
- ECM/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 ECM/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 battery.