P1776

DTC P1776
Transmission torque signal problem Drive cycle B:Signal implausible.

Possible causes by suggested order of priority:
^ Open circuit - C637/36 (W) to C193/16 (W).
^ Open circuit - C637/37 (Y) to C193/44 (Y).
^ Gearbox ECU problem.
^ Motronic ECM problem.
^ Connectors C193, ECM C637 (B).

Open Circuit - C637/36 (W) To C193/16 (W).
OPEN_CIRCUIT
^ Check resistance > 1M Ohm

Open circuit - C637/37 (Y) to C193/44 (Y).
OPEN_CIRCUIT
^ Check resistance > 1M Ohm

Gearbox ECU problem.
CHECK THE FOLLOWING:
^ Possible incompatible Gearbox ECU and Motronic ECM. Check correct units fitted and correct tune selected where applicable.
^ Possible faulty gearbox ECU - run gearbox diagnostics if TestBook available.
POSSIBLE FAULTS
^ Gearbox and ECM incompatible.
^ Gearbox ECU fault.

Motronic ECM Problem.
CHECK THE FOLLOWING:
^ Possible incompatible Gearbox ECU and Motronic ECM. Check correct units fitted and correct tune selected where applicable.
^ Possible faulty Motronic ECM. Try substituting a known good unit if no other faults diagnosed.
POSSIBLE FAULTS
^ Gearbox ECU and Motronic ECM incompatible.
^ Motronic ECM fault.

Connectors C193, ECM C637 (B).
CONNECTOR
^ Check for connector not correctly latched, backed out pins, damaged pins, corroded pins.