So i recently did a ton of work to my 1996 T100 SR5 3.4. I m currently getting a check engine with a very rough idle. I took it to a parts store but when they hoocked up to the OBD2 port it wouldnt talk to thier code reader, something about unable to get title or something like that. So far i havent been able to find anyone to read the OBD1 port in my area. So I tired the jumper trick to get the check engine light to flash =, well that didnt work. I honestly dont know if I am even jumping the correct ports or not as i am missing the over for the OBD1 port. Any help on this matter would be great.

 

The 5vzfe is an OBDII engine only. Yer gonna need to check the OBD2 fuse in the fuse box to make sure it's not blown. Use a test light to double check the fuse is passing power.

 

MTL 4runner posted this a long time ago- it really helped me-
J1850 VPW uses pins 2, 4, 5, and 16. Most American cars use J1850 VPW (as well as early Toyotas).

Pin #, Description
2 - Data (on my 96 the wire is White, goes to ECU connector)
4 - Chassis Ground (on my 96 the wire is Brown, check to ground)
5 - Data Ground (on my 96 the wire is White/Black, check to ground)
16 - Power (on my 96 the wire is Violet and is fused, 10 Amp)


https://www.yotatech.com/forums/f2/o...omputer-93580/

 

The 1996 T-100 should be using the ISO9141 protocol fer OBDII. I believe that the 1995 T-100 used the J1850 protocol. I can't remember exactly sure what protocol the 1994 3rzfe engine based T-100 used. My 1998 T-100 uses the ISO9141 protocol.

 

In case it's this one...from the link above

ISO 9141-2 Protocol Pins

ISO 9141-2 uses pins 4, 5, 7, 15 and 16. This is the most common type for non-US vehicles, especially Japanese models.

Pin #, Description
4 - Chassis Ground
5 - Data Ground
7 - Data
15 - Data (this pin is optional and may not be present)
16 - Power

 

So my 1995 t100 3.4 built in February of 1995 has a check engine light on. I have tried jumping pins E1&TE1 together but my trucks engine light doesn’t flash at all, just constantly on. I have checked all fuses in the truck and they are good. Any ideas on why my truck doesn’t flash engine codes?