Porsche 1989 944 S2, Workshop Manual

Page: 144 / 167

24/28
Fuel System - Electronic Control 944 S/944 S2
Fault, Fault Code Possible Causes, Elimination, Remarks
Test Point 2:
Idle speed
contact ( )
Ground short
Fault Code 1_12
Check via circuit input test with 9288 System Tester or 9268 Tester.
Select test step and operate accelerator pedal.
9288 Display: Idle speed contact made
Idle speed contact broken
9268 Display: 1332 (idle speed contact made)
0000 (idle speed contact broken)
No Display:
Pull off plug on DME control unit.
Connect ohmmeter between terminal 52 and terminal 24 with help of test
leads.
Display:
Throttle valve closed
Throttle valve opened to gap of
< 10
> 1° =
If the value of the idle speed 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 terminals 1
and 2 of the throttle valve switch with help of test leads.
Display:
Throttle valve closed
Throttle valve opened to gap of
< 10
> 1° =
Idle speed
contact ( )
Break
Fault Code 1_15
Testing same as described for ground short
(fault stored in memory as of 1991 models).
Check for correct adjustment, correcting if necessary.
Cause, for example, could be an incorrectly adjusted throttle valve switch or
accelerator cable.
D 24/28 - 10 DME - Diagnosing/Troubleshooting
Printed In Germany - XXI, 1989