P1538

P1538

Diagnostic information - DME (DFI)

Oil pump activation

NOTE:
- The oil-pressure regulating valve is controlled via a PWM signal.
- Among other things, the PWM signal is dependent on:
- Ambient conditions (temperatures, off period etc.)
- Engine operating point (rpm, Load, Oil temperature, ...)
- Measured oil pressure (at oil pressure sensor)
- A fault is detected if the PWM signal is outside a defined range (PWM signal for oil-pressure regulating valve implausible).

Diagnostic conditions
- Engine running

Possible fault causes
- Oil pressure too low
(oil level, Oil quality, Oil dilution, dirt in oil circuit, oil circuit faulty)
- Oil pressure too high
(dirt in oil circuit, Oil quality, Oil dilution, oil circuit faulty)
- Oil pressure sensor Faulty
- Oil pressure sensor - incorrect hardware version
(5 bar from/to 10 bar)
- Oil pressure-regulating valve faulty
- Oil pump faulty