Porsche 928 Workshop Manual page 312

928
Engine - Cooling
19
Function-testing the individual
senders with an ohmmeter.
1.) Temperature sender, cooling
water
A resistance of between 1000 ohm
and 4000 ohm, depending on
engine temperature, should be
measurable between pin 1 of plug
II and pin 7 of plug I.
Readina:
a "
60°C = 3862
ohm + 150 ohm
85°C = 1582
ohm f.
54 ohm
1OD'C = 967 ohm 2
36 ohm
2.) Pressure sender, Frigen
Pin 4, plug II and pin 7, plug
iesistance is between 20 ohm and
150 ohm, depending on Frigen
pressure.
Reading.
1.5 bar = 22 ohm f 4 ohm
5 bar = 53 ohm t 4 ohm
10 bar = 92
15 bar =125 ohm ohm f. ? 5 5 ohm ohm
Engine-compartment
Pin 6, plug II and
Engine-compartment
Reading: m ohm
Engine-compartment
lid switch
pin 7, plug
I
lid closed
lid open
Reading: 0 ohm - 20 ohm
Temperature switch intake/
automatic transmission
Pin 3, plug II and
Intake temperature
Reading: 0 ohm
Intake temperature
Reading:
- ohm
pin 7, plug I
> 87.5"C
< 82.5"C
Temperature switch, automatic
transmission
>
110°C
reading: 0 ohm
< 105'C reading: m ohm
If the values stated are not
reached, the sender in question is
defective.
a
Printed in Germany-XVII,1987
Function-testing Senders 19 - 23