P0725

P0725
Engine RPM Signal. Incorrect





Fault symptoms

CHECK GEARBOX warning lamp on.

Conditions
The input speed has exceeded 500 rpm after switching on the ignition.

Fault criteria
The TCM receives information from the bus, transmitted by the ECM, about the current engine speed. If the ECM transmits a message which says that the information is incorrect a P0725 diagnostic trouble code is generated.

Diagnostic help
The engine speed can be read with the diagnostic tool. - Choose " Read Values / Activate " and " Engine Speed (Bus from Trionic)"

Check the wiring
Jiggle the wiring harness at several points and in different directions to reveal intermittent breaks and short circuits in the various leads. Observe the multimeter, test lamp or diagnostic instrument while carrying out this check.