Check engine light and OBD1 and OBD2 ports
03-24-2019, 11:11 AM
#1
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Check engine light and OBD1 and OBD2 ports
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.
05-06-2019, 07:06 AM
#3
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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/
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/
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old87yota (05-06-2019)
05-08-2019, 12:57 PM
#4
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. 
05-08-2019, 02:08 PM
#5
Contributing Member
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
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
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BamZipPow (05-08-2019)
08-08-2019, 07:21 PM
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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?
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