Transmission Diagnosis

P0563- SYSTEM VOLTAGE HIGH (L81)









The Transaxle Control Module (TCM) is powered from fused battery and ignition 1 voltage supplied through the underhood fuse block. The TCM monitors system voltage on the ignition feed and fused battery circuit. If the system voltage is higher than the TCM is capable of operating properly under, DTC P0563 sets.

DTC PARAMETERS
DTC P0563 will set if:
^ System voltage is greater than 18 volts
^ Engine speed greater than 500 rpm for 5 seconds
^ Engine is not at fuel cutoff
P0563 is a (type A) DTC.

DIAGNOSTIC AIDS
Check for the following conditions:
Poor connection or damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, observe the IGNITION 1 voltage display on the Scan tool while moving connectors and wiring related to the TCM, dash harness, and engine harness. A change in display will indicate the location of fault.
If DTC P0563 cannot be duplicated, reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.