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944 Self-diagnosis
03
Key 1 selects the next actuator (e. g. idle actuator). Following
instruction:
Repair fault accord-
ing to repair
instructions
Continue:
>
After pressing key > , the following display appears:
Injector
to activate
1 = Start
Continue:
>
Proceed with key 1
Can injectors be
heard / felt?
1 = yes
3 = no
Proceed with key 1 to the next actuator.
Idle stabilizer
to activate
1 = Start
Continue:
>
Proceed with key 1
Can idle stabilizer
be heard / felt?
1 = yes
3 = no
By pressing key 1, the next actuator is selected. After pressing
key 3, the next instruction appears:
Repair fault accord-
ing to repair
instructions
Continue:
>
Proceed with key >
Idle stabilizer
to activate
1 = Start
Continue:
>
After pressing key 1. the following display appears:
Can idle stabilizer
be heard / felt?
1 = yes
3 = no
By pressing key 1. the next actuator is selected. The actuators are
selected one after the other and triggered until the following
display appears:
Drive link test
completed
Return:
N
By pressing the key N. the operator is returned to the menu.
3.3 Circuit inputs
In addition lo the actuators, the Systemtester 9288 can also
check circuit inputs. To this end, operate the Systemtester 9288
in accordance with 3.1 until this menu display appears:
Menu
1 = Fault memory
2 = Drive links
3 = Input signals
>
Press key 3
Idle contact
1 = Start
Continue:
>
By pressing key > the next circuit input is selected.
The next display appears when key 1 is pressed.
Activate accl. pedal
Idle contact
- closed -
Continue:
>
Operate the accelerator pedal, the following display appears:
Activate accl. pedal
Idle contact
- open -
Continue:
>
The next circuit input is selected by pressing key >. Repeat until
this display appears:
Input signals
testing compleled
Return:
N
Press key N for return to menu
3.4 System adaptation
When the function "System adaplation" is triggered. the ECU re-
gisters the basic air requirement of the engine.
To this end. operate the Systemtester 9288 as per 3.1 until the
following menu display appears:
Menu
1 = Fault memory
2 = Drive links
3 = Input signals
>
Proceed with key >
< Menu
1 = System adaptation
Operating instructions for System Tester 9288
Printed in Germany - XXIV, 1991
03 - 37