Porsche 928 Workshop Manual page 591

24
Electronic Fuel Injection
Fault, Fault Code
Possible Causes. Elimination. Remarks
928 s4
928 GT
a
Test
point 4
Engine temperature
sensor II Q
Fault code l-14
Disconnect the LH control unit plug.
Connect the ohmmeter to terminals 13 and 5 or 17 of the LH control
unit plug using the test leads.
Display: resistance
Test values
at:
0°C = 4.4 - 6.8
kQ
15-30°C = 1.4.3.6kS1
40°C = l-l.3
k'J
80°C = 250.2900
100°C = loo-210n
If the values are not reached, check directly at the engine tempera-
ture sensor. Do not connect both contact tabs to the ohmmeter, but
chect each contact tab saeparately against ground (there are 2 inde.
pendent temperature sensors).
a
1 - EZK
2
- LH
Note: temperature sensor II supplies the cylinder head temperature
to the control unit. It is responsible for mixture enrichment during
cold starts and when the
engine
is
warming up.
D24-14
LH-Diagnosis/Troubleshooting
a
Prlmed In Germany - XXV. 1990