1995 Chevy S-10

RRFIELS65

MEMBER
1995 CHEVROLET S-10
4 CYL
2WD
AUTOMATIC
181,000 MILES

16 pin aldl obd1.5

To any body else that owns one of these

and any other 94-95 car or trck model with PCM OBD1.5 located under glovebox/kick panel, true OBD2
PCM's are located in engine compartment.
They also have a knock sensor mounted atop of it.
along with a MAF and a extra heated O2 sensor at
back of the CAT/Convt.
OBD1, OBD1.5 have a removeable PROM - OBD2 has
a EEPROM and is not removeable.

OBD1 was flashed with 160 baud/8192baud(J2234)
OBD1.5 with 160/8192 w/UART(J1849vpw)
OBD2 with 160/8198 w/UART-CAN H+/L-(J1850vpw)

OBD1 12 pin / A=Blk.W/Wht. Wire(ECM signal grd.)
B=Wht.W/Blk. Wire(160)
D=Wht. Wire (UART) ABS
E=Tan w/Blk. Wire (8192)
M=Orange wire (12vdc)
Jump A+B get code flashout, clear codes by unhooking Neg. Post on battery.

OBD1.5 16 pin / pin4=Chasiss Grd.(Blk. Wire)
pin5=PCM Signal Grd.(Blk.W/Wht. Wire
pin6=160/canh+(Wht.W/Blk. Wire)
pin9=8192 (Tan w/Blk. Wire)
pin12=UART(Wht. Wire)ABS
pin14=UART(pink wire)canL-
pin16=(12vdc)Orange wire
Jump 5+6 get code flashout, to clear out codes a scan
ner w/ OBD1/OBD2 protocals is needed with a GM
Specific (16 pin connector-Blue plug-in) or go to junk
yard and get a 12 pin ALDL and wire it like so.

( A to pin5, B to pin6, E to pin9, M to pin16)
Use the OBD1 connector on the 12 pin ALDL.

2 Replies

95SONOMADRIVER

MEMBER
1 POST

I have a 1995 Sonoma also 4cyl 2WD but stick and I seem to have a similar problem. But this post is the first I have ever heard of OBD1.5

I have an ODB2 data port under the dash on the driver side. I haven't climbed under it to look really close at the pins that are present/absent.

A couple of questions.

1) By "true OBD2 PCMs are located in the engine compartment, " are you saying that all unless you're directly connecting to the computer, your system is NOT an OBD2 design?

2) Can I take an ODB2 cable and hook it up to an OBD1 scanner to read ODB1 and OBD1.5 codes (whichever my truck has)? Or do I have to use the ALDL cable and a PC/laptop?

Thanks!