The diagnostic plug, ALDL (=Assembly Line Diagnostic Link), is located on the right side of motor compartment.
The plug looks like this:
A - Earth
E - Engine data channel
F - +12v
G - Bidirectional engine data channel
OPEL OMEGA - MOTRONIC DIAGNOSTIC
Plug
The diagnostic plug, ALDL (=Assembly Line Diagnostic Link), is located on the right side of motor compartment.
The plug looks like this:
A - Earth
E - Engine data channel
F - +12v
G - Bidirectional engine data channel
How to get codes out?
No warranty, use at your own risk.
Connect:
A and B - Fault codes of Motronic
A and H - Fault codes of cruise control and original anti-theft system
Codes can be read from "check engine" lamp when ignition is "on" (motor NOT running)
Every cycle begins with code "12" (=Start of diagnostic mode)
Every code comes three times (12-12-12)
Motronic (1.5) after 9/1989 gives fault code "31" (crankshaft freq. sensor won't give information = motor not running)
First flashes mean "tens", then pause, and second flashes mean "ones". And this happens three times. After that comes the next fault code (if there's one).
Code 12 looks like:
Pause
Longer pause
Pause
Longer pause
Pause
Fault codes
Motronic 4.1 (till 8/89)
12 - Start of diagnostic mode
13 - Lambda sond
14 - Temperature sensor (cooling liquid) low voltage
15 - Temperature sensor (cooling liquid) high voltage
46 - Temperature sensor (oil) low voltage
47 - Temperature sensor (oil) high voltage
48 - Low voltage for ECU (less than 10v after 3 minutes from start)
49 - High voltage for ECU (more than 16v)
51 - Memory error (ECU)
69 - Temperature sensor (air) low voltage
71 - Temperature sensor (air) high voltage
73 - Air flowmeter /low voltage
74 - Air flowmeter /high voltage
Motronic 1.5 (since 9/89)
12 - Start of diagnostic mode NOT A FAULT
13 - Lambda sond
14 - Temperature sensor (cooling liquid) /low voltage
15 - Temperature sensor (cooling liquid) /high voltage
19 - Wrong signal from crankshaft revolution/position sensor
21 - Throttle position sensor /high voltage
22 - Throttle position sensor /low voltage
25 - Injector (cylinder 1 & 2) /high voltage
26 - Injector (cylinder 3 & 4) /high voltage
27 - Injector (cylinder 5 & 6) /high voltage
31 - No information from crankshaft frequency sensor
48 - Low voltage for ECU (less than 10v after 3 minutes from start)
49 - High voltage for ECU (more than 16v)
52 - Check-lamp circuit/high voltage
53 - Fuelpump relay circuit /low voltage
54 - Fuelpump relay circuit/high voltage
55 - Replace ECU
56 - Mixture regulator (idle) circuit high voltage
61 - Fuel tank ventilation circuit low voltage
62 - Fuel tank ventilation circuit high voltage
69 - Temperature sensor (air) low voltage
71 - Temperature sensor (air) high voltage
73 - Air flowmeter /low voltage
74 - Air flowmeter /high voltage
81 - Injector (cylinder 1 & 2) /low voltage
82 - Injector (cylinder 3 & 4) /low voltage
83 - Injector (cylinder 5 & 6) /low voltage
87 - Air-condition compressor relays /low voltage
88 - Air-condition compressor relays /high voltage
93 - Hall /low voltage
94 - Hall /high voltage
