Porsche 928 Workshop Manual page 613

28
Fuel System I Electronic Control
928S4
928 GT
Fault, Fault Code
Possible Causes. Elimination. Remarks
Test point 2
Full load contact (R)
Ground short
Fault code 2-13
Check by means of circuit input test with 9288 system tester or
9268 tester
Select the test step and depress the accelerator pedal.
9288 display:
Full load contact open
Full load contact closed.
9268 display:
1333 (full load contact open)
0000 (full load contact closed).
No display:
Disconnect the plug from the EZK and LH control unit and connect
the ohmmeter with terminals 18 and 26, using test leads.
Display:
Throttle valve closed
ms2
Throttle valve open
<lOR
If the full load contact values are not reached during this test, repeat
the test directly at the throttle valve switch:
Disconnect the plug at the throttle valve switch. Connect the ohmme-
ter between terminals 1 and 2 of the throttle valve switch, using test
leads.
Display:
Throttle valve closed
Throttle valve open
mQ
<lOQ
a
D26-6
EZK-Diagnosis/Troubleshooting
a
Printed in Germany - XXV, 1990