turn signal OPEL ASTRA 1991 Electronic Workshop Manual

Downloaded from www.Manualslib.com manuals search engine 11 DIAGNOSTICS
Various possible methods of fault finding are listed below
to reduce down-time of the vehicle.
11.1 Diagnostic codes
The CPU continuously monitors its own activities and sensor
inputs. If a fault is detected during operation the diagnos-
tic lamp is turned on and a default signal value is used to
allow the car to be driven with slightly reduced perform-
ance. The fault code is stored in RAM for later evaluation
by the Dealer. If the fault disappears the unit will immedi-
ately use the sensor data instead of the default data, thus
ensuring optimum performance. The fault will be erased from
RAM after 7 starts (ignition turned on 7 times) during which
no fault was detected.
The fault stored in RAM could be accessed by grounding the
diagnostic initialisation input terminal. The fault will
then be flashed out by the diagnostic lamp.

Downloaded from www.Manualslib.com manuals search engine DIAGNOSTIC CODES
Code Cause
_____________________________________________________
14 Coolant temperature sensor voltage too low
15 Coolant temperature sensor voltage too high
21 TPS voltage too high
22 TPS voltage too low
25 MAT sensor voltage too low
26 MAT sensor voltage too high
33 MAP sensor voltage too high
34 MAP sensor voltage too low
35 Idle control stepper motor failure
36 Timing map selector error
42 Reference signal error/Engine stall
(Diagnostic lamp will not turn ON)
44 Fuel map selector error
48 Battery voltage too low
49 Battery voltage too high
65 CO potentiometer voltage out of range

Downloaded from www.Manualslib.com manuals search engine 11.2 Volt- and ohmmeter
No repair work inside the ECU's is possible and
recommended.
A multimeter could however be used to ensure that the fol-
lowing inputs to the ECU are present:
11.2.1 Battery voltage:
11.2.2 The voltage measured between terminals
26B (pos) and 25B (neg) should be equal to the battery
voltage (6 and 16 VDC).
11.2.2 Ignition voltage: The voltage between terminal 22B
and
power ground should be equal to the battery voltage with
the ignition turned on.
11.2.3 TPS supply voltage: The voltage between terminal
09B
and signal ground should be between 4.6 and 5.2 volt.
11.2.4 TPS input signal voltage: The voltage between terminal
05B and signal ground should be:
Closed throttle 0.3 < VTPS < 1.0
Part load 1.0 < VTPS < 3.11
WOT 3.11 < VTPS < 5.2