Solenoid Valve 1 Check (S/C to +12V).

DTC P0753
Solenoid valve 1 check (S/C to +12V).

Possible causes by suggested order of priority:
^ C193/30 (OP) shorted to +12V.
^ ECU fault.

C193/30 (OP) Shorted to +12V.
CHECK THE FOLLOWING:
^ C193/30 (OP) shorted to +12V.
^ Disconnect EAT C193 before measuring voltage between C193/30 (OP) and vehicle earth.
ACCEPTABLE RESULTS
^ Between 0.0 V and 4.0 V.
DIAGNOSTIC HINTS
^ If the voltage is above the acceptable range check the harness connected to C193/30 (OP) for short circuit to +12V

ECU Fault.
CHECK THE FOLLOWING:
^ Ensure that the check for short to +12V has been carried out.
^ Check transmission ECU by substitution with a known good unit.
POSSIBLE FAULTS
^ Faulty transmission ECU.