Ok, so my CEL come on about a week ago, and today I decide to pull the codes. To my surprise, not one, not two, but three codes came up today.
1. 0304 - the dreaded knock sensor
2. 0303 - Front Left heated 02 sensor
3. 0504 - Automatic Transmission Control Unit Signal to ECU

the first 2 I know, but wtf is that 3rd one??
Can anybody explain what that is, and where I can find it. Just my luck with these darn codes. I recently just changed my crankshaft position sensor too.

Any feedback would be greatly appreciated. Thank you.

 

As far as the 0504 code (ATC signal), you must extract the codes from the "transmission" computer. This will tell you what is possibly going on with the transmission. If you have access to a Hayne's manual, you must follow a procedure to extract the codes. The process can be found on pages 7B-2 and 7B-3.

 

The credit goes to ripper7 for this information.

AT diagnostic
__________________________________________________ ________________

95-97
1. Start engine and warm to normal operating temp with O/D off.
2. Turn ignition swith to off postiton wait 5 sec.
3. Turn ignition switch to the ACC position.
4. Put O/D to ON.
5. Move shifter to P, turn ignition on but don't start engine.
6. The OD light should come on for about 2 secs.
a. if light does not come on somthing is wrong with the trans. computer.
b. if light comes on proceed to no 7.
7. Turn ignigton key to off.
8. Turn ignition key to on, don't start engnie.
9. Move shift lever to D, trun ignition to off.
10. Put O/D switch to off position.
11. Turn ignition off.
12. Put O/D to off, turn ignition ON wait 2sec and move shifter to the 2 position.
13. Put O/D to on, move shifter to 1 position.
14. Put O/D to off, depress accelerator all the way to floor and release.
15. The computer is now in output mode and will start displaying the codes.



There’s one long flash that signifies the start of the sequence. Following
should be 10 short flashes. Then it
repeats.
Remember the first long flash indcates the start of the sequence followed by
10.

All 10 flashes the same = No error codes read at this time
1st flash longer than others = Revolution sensor is shorted or disconnected.
2nd flash longer than others = Speed sensor circuit is shorted or disconnected.
3rd flash longer than others = Throttle sensor circuit is shorted or
disconnected.
4th flash longer than others = Shift solenoid “A” circuit is shorted or
disconnected
5th flash longer than others = Shift solenoid “B” circuit is shorted or
disconnected
6th flash longer than others = Overrun clutch solenoid circuit is shorted or
disconnected
7th flash longer than others = Lock-up solenoid circuit is shorted or
disconnected
8th flash longer than others = Fluid temperature sensor is disconnected or A/T
control unit power source
circuit is damaged.
9th flash longer than others = Engine revolution signal circuit is shorted or
disconnected
10th flash longer than others = Line pressure solenoid circuit is shorted or
disconnected

All the same with no long start flash = Battery low, been disconnected, or
control unit has just been
reconnected.
--------------------
FAQ YOU

 

Alright guys, i will try this. Thanks alot. I apreciate the info