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Discussion Starter #1
How to do? 91-94 doesnt have the "Self-Diagnostics" switch.

Thz
 

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lshadoff said:
Thanks for the link. Dumb question - where do you see the codes flash? The "Check Engine" light? I've never had to do this, but the directions didn't say where the codes flash.

Thanks!
Regards,
Michael
 

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i belive it is a small LED on the ECU its self.
 

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MShorten said:
Thanks for the link. Dumb question - where do you see the codes flash? The "Check Engine" light? I've never had to do this, but the directions didn't say where the codes flash.

Thanks!
Regards,
Michael
Both the LED on the ECU and the Check Engine Light will flash out the codes.
 

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It depends on whether your car has a single or dual LED. From the B13 FSM:

ENTERING SELF-DIAGNOSTICS

Single LED System
1) Self-diagnostic system normal operational mode is Mode I.
With ignition switch in ON position and engine not running, insert
screwdriver through access port on ECM.
2) Turn screwdriver fully clockwise. Wait at least 2 seconds.
Turn screwdriver fully counterclockwise. Inspection light will begin
to flash. This is Mode II.
NOTE: Modes cannot be switched when engine is running. When
ignition switch is turned to OFF position, ECM will switch
to Mode I.

Dual LED System
1) Turn ignition switch to ON position. Use a screwdriver to
turn ECM diagnostic mode selector fully clockwise.
2) Wait for inspection lights to begin flashing. At this
time, inspection lights will flash mode options (i.e., one flash for
Mode I, 2 flashes for Mode II, etc.). As soon as inspection light
flashes desired mode number (3 flashes for self-diagnostic mode), turn
mode selector off (fully counterclockwise).
3) If mode selector is kept in ON position (fully clockwise),
mode selections will continuously cycle. This cycling will not erase
memory.

RETRIEVING CODES

Single LED System
When Mode II is accessed (engine not running), codes stored
in ECM memory will be flashed by CHECK ENGINE light and Red LED on
side of ECM. Long flashes (.6 second) indicate first digit of code.
Short flashes (.3 second) indicate second digit of code. For example:
3 long flashes followed by 5 flashes of Red LED (or CHECK ENGINE
light) indicate a Code 35.

Dual LED System
Trouble codes are read using Red LED and Green LED inspection
lights on side of ECM. After selecting Mode III, trouble codes
corresponding to mode will start flashing. Trouble codes are indicated
by number of flashes from ECM Red LED and Green LED inspection lights.
Count number of flashes. Red LED indicates first digit of code, and
Green LED indicates second digit of code. For example, 3 flashes of
Red LED followed by 2 flashes of Green LED indicate Code 32.

Lew
 

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Discussion Starter #9
Iv cheked my ECU, and didnt find any twist butom, just find a hole.
I was afraid to insert a screwdriver on that hole..

I tried to see inside the hole with a flash light, but isnt any think close to the hole..

Is in that hole where i need to insert the screwdriver?

thz
 

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I ran the codes on my 95 GXE, but it came up with code "25." Not listed in the haynes manual, or anywhere on-line that I can find. Does anyone know where I can find out what this code means? Thanks!
 
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