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

Motronic (A and B)

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

---