Volvo TAD650VE Workshop Manual page 49

Group 30: Electrical system
splice
splice
Note! Only TAD 650, 660, 750, 760 has an engine interface. On
TAD 734 the wiring to the EMS 2 is the same but without any en-
gine interface.
Circuit description
The sensor is an active sensor, i.e. the sensor must
receive operating voltage. Pin B17 on the engine con-
oil pressure
trol unit (EMS 2) provides pin 1 on the sensor with an
operating voltage of +5 Volt. Pin 3 on the sensor is
connected to battery negative via pin B18 on the EMS
2.
The output signal from the pressure sensor, pin 2 on
the sensor to pin B11 on the EMS 2, is a voltage sig-
nal that is proportional to the oil pressure (after the oil
filters).
Fault tracing
FMI 1 Oil pressure is too low
Conditions for fault code:
Oil pressure depends on the engine revolution. Oil
pressure exceeds the set value of the engine protec-
tion parameter.
Possible reason:
•
Too low engine oil level.
•
Blocked oil filter.
•
Oil leakage.
•
Faulty oil pressure sensor.
Suitable action:
1. Check engine oil level and quality of the oil.
2. Change engine oil and oil filter to prevent blocked
oil filter.
3. Check that no engine oil leakage occurs.
4. Check function of oil pressure sensor by control
measuring the engine oil pressure (see workshop
manual Group 21-26).
Diagnostic Trouble Codes
47