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Here's what I found (very long):
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Posted by Victor (more from Victor) on Fri, 19 Aug 2005 05:12:19 Share Post by Email
In Reply to: Re: 1994 9000 aero check engine light, what's it mean?, rhale, Thu, 18 Aug 2005 15:45:06
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It's little confusing, but see if you can use it:

Reading trouble codes by means of the CHECK ENGINE (MIL) lamp can be done as soon as the ignition switch is turned to the ON position. Reading of the trouble codes can be repeated as often as required until the trouble code memory has been cleared.

The diagnostic trouble code memory is cleared by means of an ISAT Scan Tool. The trouble code memory will not be cleared if the control module power supply fails or is disconnected.

Read out diagnostic trouble codes as follows:
1.Switch OFF the engine.
2.Turn the ignition switch to the ON position.
3.Connect pin 2 of the car's 10-pin data link connector (located under the right-hand front seat) to ground (use the test lamp to avoid a short circuit). Lamp flash code readout will continue as long as pin 2 remains grounded.
4.The lamp flash codes are of two-digit type. Each digit consists of a number of 0.4 s flashes. An interval of 1.2 s occurs between the presentation of each digit in the two-digit code.
5.Lamp flash code readout will continue as long as pin 2 remains grounded. The interval between two distinct lamp flash codes is 3.2 s.
Diagnostic trouble codes should be used only for purposes of diagnosing faults. It is not absolutely certain that they indicate a faulty component.

II

Diagnostic trouble codes can be read off via the CHECK ENGINE lamp (MIL) after the lamp test performed when the ignition is switched on. Reading of the lamp flash codes can be repeated until the diagnostic trouble code memory has been cleared. The DTC memory is normally cleared by means of the Scan Tool but in an emergency it can be cleared by unplugging the Trionic control module connector for at least 5 minutes. Note that the control module will then lose all adapted values.

Obtain readouts of diagnostic trouble codes as follows:
1.Turn the ignition switch to the OFF position.
2.Then turn it to the ON position. 3 The CHECK ENGINE lamp (MIL) should
· light up and stay on for about 3 seconds
· Go out for about 3 seconds
· light up and stay on for about 3 seconds
· Go out for about 2 seconds
The last on/off sequence (3s/2s) is a warning that the lamp flash code is about to appear.
4.The lamp flash code consists of a number of brief flashes having a duration of 0.4 seconds. The CHECK ENGINE lamp (MIL) goes out for 2 seconds between each new lamp flash code (if there is more than one fault).
5.After the last lamp flash code, the malfunction indicator lamp goes out for 3 seconds before lighting up again for 3 seconds, after which the lamp flash codes are repeated once again. DTC readout continues in this way as many times as you wish.


Codes:
2-MAP sensor
3-Intake air temperature sensor
4-Coolant temperature sensor
5-Throttle position sensor
6-Oxygen sensor
7-Adaptation
8-EVAP canister purge valve
9-Control module, internal fault





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