i need to know if there is anyway to self diag a s13 ecu.i really cant find the chiltons manual for the car.
thanks

joe

 

yes

pull the passenger kick panel off, unbolt the ecu from the car, leave the wiring harness connected.

if its a 89-90, turn the screw all the way clockwise, wait for it to blink 3 times, then turn it back counterclockwise....

This will initiate a set of blinks...

if its DOHC 91+ then turn it clockwise, hold for a few seconds, then turn back counterclockwise. This will also initiate a set of blinks....

All this must be done with key in on possition but car off aswell....

Then start counting blinks, on 89-91 red = first digit, green = second digit.
on 91+, you will have a slow flash meaning the first digit (or 10 first 2 digits for 100+ numbers) then sequential faster flashes indicating the second digit of the number, and then a pause, and the next number will come about.

Example is

Blink.........blink........Blink.........blink.... ....Blink
then
blink...blink....blink...blink....blink
then
.....long pause......
next number.

heres a partial list off 240sx.org of codes/meanings. I think most nissans share the same codes, so if its not on there, post it and we can find it

11 - Camshaft Position Sensor
12 - Mass Air Flow Sensor
13 - Coolant Temperature Sensor
14 - Vehicle Speed Sensor
21 - Ignition Signal Primary
25 - IACV-AAC Valve
31 - ECM
32 - EGR System
33 - Front O2 Sensor
34 - Knock Sensor
35 - EGR Temp Sensor
36 - EGRC-BPT Valve
37 - Closed Loop
41 - Intake Air Temp Sensor
43 - Throttle Position Sensor
55 - Everything is OK
65 - CYL 4 Misfire
66 - CYL 3 Misfire
67 - CYL 2 Misfire
68 - CYL 1 Misfire
71 - Random Misfire
72 - TW Catylist System
76 - Fuel Injection System
77 - Rear O2 Sensor
82 - Crank Position Sensor (OBD)
84 - A/T Diag Comm Line
95 - Crank P/S (OBD) Cog
98 - Coolant Temperature Sensor
103 - Park/Neutral Position Switch
105 - EGRC Solenoid/V

 

thank you