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MOTRONIC SELF-DIAGNOSIS
Using button 3
near the control unit, the operator can receive information about the type of
malfunction which has occurred, following the procedure listed below and
watching the "Check Engine" lights:
1 -- Turn the ignition key to run.
2 -- Press button 3 for 2.5 to 5 sec.
3 -- After a pause of 0.5 sec. and a cycle of 2.5 sec. ON and 2.5 sec.
OFF, the first information block is displayed. It is supplied in short
flashes of 0.5 sec. On and 0.5 sec. OFF, the number of flashes most be noted
and represents the first of the four (4) numbers in the error code. At the
end of the first block of information there will be a pause of 2.5 sec.
(light off), followed by the second block and the third and fourth in the
same way.
Each flash code starts with the sequence ON and OFF and finishes with a
pause of 2.5 sec.
The code 4444 indicates that no errors have been detected.
The button is pressed again for 2.5 to 5 sec. to move on to investigate
any subsequent error.
At the end of display of the last error a series of flashes of 2.5 sec.
occurs to indicate that all the errors have been displayed.
Now press the button for 1O sec, in order to erase the error memory.
The chart below shows all the flash codes relating to the types of
errors which can be picked up.
Remember that some errors do not cause the illumination of the "check
engine' warning light when the car is in use, but are stored In the control
unit; the flash code of these errors can therefor only be picked up during
the self-diagnosis procedure.
MOTRONIC M 2.7 Self-testing Function Codes
Lamp
Flashing
Display Code
Hot wire air flow meter
1111
S
Engine coolant temp. sensor
1112
S
Throttle potentiometer
1113
S
Lambda sensor
1114
S
Lambda regulation
1121
S
Additive value for self-adaptation lambda regulation
1212
S
Mulplicative value for self-adaptation lambda regulation
1212
S
TRA value for self-adaptation lambda regulation
1212
S
Intake manifold compensation valve
4111
N
Injection valve n. 1
1411
S
Injection valve n. 2
1412
S
Injection valve n. 3
1413
S
Injection valve n. 4
1414
S
RPM sensor
1121
S
Stroke sensor
4112
N
Power module not used
4113
N
Battery voltage
1122
S
TDC control unit recognition
4114
N
Secondary air solenoid valve
1123
S
Purge valve
1124
S
Catalyzer temperature ECU
4121
N
Catalyzer temperature too high
4122
N
Speedometer signal
4123
N
Short circuit on idle regulator
1311
S
Open circuit on idle regulator
1312
S
No error detected
4444
N
M. I. L.
1444
S
Electronic control unit (ECU)
1313
S
Compressor connection signal
4131
N