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).
- Check resistance > 1M Ohm

Open circuit - C637/37 (Y) to C193/44 (Y).
- 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).
- Check for connector not correctly latched, backed out pins, damaged pins, corroded pins