Pressure Regulator Monitoring (S/C to Ground or O/C)

DTC P0748
Pressure regulator monitoring (S/C to Ground or O/C).

Possible causes by suggested order of priority:
- Short circuit C193/5 (G) to vehicle earth.
- Open circuit C193/5 (G) to C193/53 (OLG).
- Short circuit C193/53 (OLG) to vehicle earth.
- Faulty EAT(gearbox) ECU

Short circuit C193/5 (G) to vehicle earth.
- Check resistance < 5.0 Ohm

Open circuit C193/5 (G) to C193/53 (OLG).
CHECK THE FOLLOWING:
- Open circuit, check resistance C193/5 (G) to C193/53 (OLG).
ACCEPTABLE RANGE > 50 Ohms.
DIAGNOSTIC HINTS
- If the reading is not within the acceptable range check for open circuit:
C193/5 (G) to C243/B (G).
Or
C193/5 (G) to C243/M (OLG).

Short circuit C193/53 (OLG) to vehicle earth.
- Check resistance < 5.0 Ohm

Faulty EAT(gearbox) ECU
CHECK THE FOLLOWING:
- Ensure all of the checks for short to vehicle earth or open circuit have been carried out.
- If these problems are not present check transmission ECU by substitution with a known good unit.
POSSIBLE FAULTS
- Faulty transmission ECU.