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'91 ecu troubles
#17
id say the harness and ECU do not match that schematic at all,
looks like the CMP is fixed. good. less variables there. very good. that.
chain linked cams, better.
then belt that must be timed ok. not early or late timed.
now that 16pin connector is shows its not "PWM, or VPW, or can-bus" (2004 is that) but can be ISO9141/14230 (comms) pin 7 only version.
lets look at the populated pins, on car this old (got air bags< got ABS? ?)? 2,3,6,9?,10,11,13. sure looks OBD2 to me.

observations on this DLC.
i see the pins are numbered correctly , just an artifact if the connector maker.
why all that grease on that connector.? pin 9 is impossible to see pin there.
ISO9141/14230
this is pin 7 only scans.


so if it is OBD2, and the ECU is OBD2.
then you connect any modern (old scan tools skip pins and can fail on old cars)
the newer scanners support all pins, every one, listed in oBD2 pages.
seen here
https://www.scantool.net/images/diagrams...pinout.gif

but this publisher skips a critical pins.

4 and 5 must be grounded. or the scan tool will never work or comm.
pin 16 is fused 12vdc, if not, most scan tools go DEAD.

check for 12v on pin 16 yet key on, that be first.
of its oBD2 compliant it will work.
how a USA car got to your country in 1996,ive not a clue, maybe it just USA harness and ECU, only , added.....at some time.
it sure does not match that KDM body tag. at all,

but he connector to me looks OBD2 setup, for ISO

ISO9141/14230

is there a data code on that ECU?

wow a GM map sensor on 1996 Korean car? hummmmm odd. seems it be Korean or Mitsubushi or Denso to me.


got a scan tool? obd2.
check for 12vdc on pin 16, it must be there key on.
plug in tool
key on, magically it will connect just key on, and can even watch you move the throttle and report throttle angle.
crank engine see RPM leave 0 and it, 300 cranking, if not the CKP or CMP are dead.
crank for 5 seconds, got P03xx errors. BINGO.

that is all you do on OBD2 cars, just that.
but the scan tool needs to be wired to pin 7 and support ISO9141/14230 OBD2 signalling rules. (all newer scan tools do, old 1996 many didnt)

what you must do is make the ECU happy
working blind with no matching scan tool makes that near impossible...... on any car with EFI.
see?
even a bad CKP coax can kill spark. just that........ bad wiring.... and must be correctly wired with shields just like new... (no ground loops by accident)
bad grounds to ECU.
power pins dead.

the $10 ELM327 based, scan tools work here. pin 7/15 wired. $10 is ebay clone price.
ever seen the ELM?
https://www.scantool.net/elmscan5-compact.html

pin 4,5 wired to ground
pin 16 ,battery voltage, 12v
pin 7 and 15 from tool to connector good, no grease on pins. ever.
key on, and it communicates.

if we had a real schematic matching the actual ECU in car, this be far more easy, i think yours is wrong. that drawing.
http://www.fixkick.com
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Messages In This Thread
'91 ecu troubles - by Kirk - 06-05-2015, 04:55 PM
RE: '91 ecu troubles - by fixkick - 06-05-2015, 11:05 PM
RE: '91 ecu troubles - by Kirk - 06-08-2015, 04:28 AM
RE: '91 ecu troubles - by GeoHacker - 06-06-2015, 02:41 PM
RE: '91 ecu troubles - by fixkick - 06-06-2015, 11:17 PM
RE: '91 ecu troubles - by GeoHacker - 06-08-2015, 07:23 AM
RE: '91 ecu troubles - by fixkick - 06-08-2015, 04:39 AM
RE: '91 ecu troubles - by fixkick - 06-08-2015, 11:16 PM
RE: '91 ecu troubles - by greenfield54 - 09-26-2015, 09:15 PM
RE: '91 ecu troubles - by fixkick - 09-26-2015, 11:38 PM
RE: '91 ecu troubles - by greenfield54 - 09-27-2015, 08:26 PM
RE: '91 ecu troubles - by greenfield54 - 09-29-2015, 09:41 PM
RE: '91 ecu troubles - by greenfield54 - 10-01-2015, 07:50 PM
RE: '91 ecu troubles - by fixkick - 10-01-2015, 11:55 PM
RE: '91 ecu troubles - by greenfield54 - 10-02-2015, 09:40 PM
RE: '91 ecu troubles - by greenfield54 - 10-03-2015, 10:11 PM
RE: '91 ecu troubles - by fixkick - 10-03-2015, 10:57 PM
RE: '91 ecu troubles - by greenfield54 - 10-03-2015, 11:03 PM
RE: '91 ecu troubles - by fixkick - 10-03-2015, 11:15 PM
RE: '91 ecu troubles - by greenfield54 - 10-03-2015, 11:21 PM
RE: '91 ecu troubles - by fixkick - 10-03-2015, 11:36 PM
RE: '91 ecu troubles - by greenfield54 - 10-03-2015, 11:47 PM
RE: '91 ecu troubles - by fixkick - 10-03-2015, 11:54 PM
RE: '91 ecu troubles - by greenfield54 - 10-04-2015, 08:56 PM
RE: '91 ecu troubles - by fixkick - 10-04-2015, 11:42 PM
RE: '91 ecu troubles - by fixkick - 10-05-2015, 02:15 AM
RE: '91 ecu troubles - by greenfield54 - 10-05-2015, 09:42 PM
RE: '91 ecu troubles - by fixkick - 10-05-2015, 10:43 PM
RE: '91 ecu troubles - by greenfield54 - 10-06-2015, 09:01 PM
RE: '91 ecu troubles - by fixkick - 10-06-2015, 11:00 PM
RE: '91 ecu troubles - by greenfield54 - 10-07-2015, 06:41 PM
RE: '91 ecu troubles - by fixkick - 10-07-2015, 10:07 PM
RE: '91 ecu troubles - by fixkick - 10-07-2015, 11:11 PM
RE: '91 ecu troubles - by greenfield54 - 10-09-2015, 09:32 PM
RE: '91 ecu troubles - by fixkick - 10-09-2015, 10:04 PM
RE: '91 ecu troubles - by greenfield54 - 10-09-2015, 10:23 PM
RE: '91 ecu troubles - by fixkick - 10-09-2015, 11:19 PM
RE: '91 ecu troubles - by fixkick - 10-10-2015, 12:36 AM
RE: '91 ecu troubles - by greenfield54 - 10-10-2015, 01:10 PM
RE: '91 ecu troubles - by fixkick - 10-10-2015, 10:35 PM
RE: '91 ecu troubles - by greenfield54 - 10-16-2015, 09:08 PM
RE: '91 ecu troubles - by fixkick - 10-22-2015, 03:56 AM
RE: '91 ecu troubles - by greenfield54 - 10-22-2015, 09:20 PM
RE: '91 ecu troubles - by fixkick - 10-23-2015, 01:25 AM
RE: '91 ecu troubles - by greenfield54 - 10-24-2015, 09:03 PM
RE: '91 ecu troubles - by fixkick - 10-25-2015, 04:12 AM
RE: '91 ecu troubles - by greenfield54 - 10-26-2015, 09:16 PM
RE: '91 ecu troubles - by fixkick - 10-26-2015, 10:41 PM
RE: '91 ecu troubles - by greenfield54 - 10-27-2015, 09:29 PM
RE: '91 ecu troubles - by fixkick - 10-27-2015, 11:04 PM

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