Porsche 1989 944 S2, Workshop Manual

Page: 145 / 167

944 S/944 S2 Fuel System - Electronic Control
24/28
Fault, Fault Code Possible Causes, Elimination, Remarks
Test Point 3
Full load contact ( )
Ground short
Fault Code 1_13
Check via circuit input test with a 9288 System Tester or 9268
Tester.
Select test step and operate accelerator pedal.
9288 Display:
9268 Display:
Full load contact broken
Full load contact made
1333 (tull load contact broken)
0000 (full load contact made)
No Display:
Connect ohmmeter on terminal 53 and terminal 24 of the
disconnected DME control unit plug with help of test leads.
Display:
Throttle valve closed
Throttle valve opened about
2/3rd of full gap < 10
If the value of the full load contact is not reached in this test, the
test should be repeated direct on the throttle valve switch as
described below.
Pull off plug on throttle valve switch. Connect ohmmeter
between terminal 3 and terminal 2 of the throttle valve switch
with help of test leads.
Display:
Throttle valve closed
Throttle valve opened about
2/3rd af full gap < 10
Remarks:
If the full load contact fails, the control unit produces a load
threshhold via the air flow sensor. Value below this load
threshold same as switch broken or above load threshold same
as switch made.
DME - Diagnosing/Troubleshooting
Printed In Germany - XXI, 1989
D 24/28 - 11