1991 OPEL ASTRA Electronic Workshop Manual

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

Downloaded from www.Manualslib.com manuals search engine 11.2.5 CO potentiometer supply voltage: The voltage
between
terminal 23B and signal ground should be between 4.7 and
5.2 volt.
11.2.6 MAP sensor supply voltage: The voltage between
terminal
24B and signal ground should be between 4.7 and 5.2 volt.
11.2.7 MAP sensor signal voltage: The voltage between
terminal
15B and signal ground with ignition on should be:
MAP signal voltage Manifold absolute pressure
_____________________________________________________
___
1.00 20 kPa
2.00 40 kPa
3.00 60 kPa
4.00 80 kPa
4.50 90 kPa
5.00 100 kPa
A general tolerance of +/- 5% exists on the above voltages.

Downloaded from www.Manualslib.com manuals search engine 11.2.8 Timing map selector: The resistance between terminal
19B and 22B measured on the harness connector with the
ECU removed should be:
97 RON - 470 ohm
93 RON - 220 ohm
87 RON - 4,700 ohm
87D RON - 5,600 ohm
11.2.9 Fuel mixture selector: The resistance between terminal
18B and 11A measured on the harness connector with the
ECU removed should be:
-15% - 274 ohm
-10% - 340 ohm
-05% - 412 ohm
+05% - 619 ohm
+10% - 768 ohm
+15% - 931 ohm
+20% - 1180 ohm
+25% - 1500 ohm

Downloaded from www.Manualslib.com manuals search engine 11.2.10 EWT sensor: The resistance between terminal 16B and
11A
on the harness connector with the ECU removed should be:
EWT øC Resistance (ohm)
-20 19,700
-0 5,640
+20 2,410
40 1,177
60 565
80 308
100 186

Downloaded from www.Manualslib.com manuals search engine 11.2.11 MAT sensor: The resistance between terminal 17B and
11A on the harness with the ECU removed should be:
MAT øC Resistance (ohm)
-12 9,977
-5 6,540
0 5,627
18 2,290
33 1,241
48 782
62 485