Question about 1999 Pontiac Montana
Unable to read obd II codes, scanner does not recognize its plugged in. Where does power feed for pin 16 originate from? Any common failure pointts?
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Posted on Jan 02, 2017
OBD 1.5 refers to a partial implementation of OBD-II which General Motors used on some vehicles in 1994 and 1995 (GM did not use the term OBD 1.5 in the documentation for these vehicles - they simply have an OBD and an OBD-II section in the service manual.)
For example, the 94-95 Corvettes have one post-catalyst oxygen sensor (although they have two catalytic converters), and have a subset of the OBD-II codes implemented. For a 1994 Corvette the implemented OBD-II codes are P0116-P0118, P0131-P0135, P0151-P0155, P0158, P0160-P0161, P0171-P0175, P0420, P1114-P1115, P1133, P1153 and P1158.
This hybrid system was present on the GM H-body cars in 94-95, W-body cars (Buick Regal, Chevrolet Lumina ('95 only), Chevrolet Monte Carlo ('95 only), Pontiac Grand Prix, Oldsmobile Cutlass Supreme) in 94-95, L-body (Chevrolet Beretta/Corsica) in 94-95, Y-body (Chevrolet Corvette) in 94-95, on the F-body (Chevrolet Camaro and Pontiac Firebird) in 95 and on the J-Body (Chevrolet Cavalier and Pontiac Sunfire) and N-Body (Buick Skylark, Oldsmobile Achieva, Pontiac Grand Am) in 95.
Depending on the year and the vehicle, a car with the OBD 1.5 system may have either the older OBD-I connector, or the newer OBD-II connector, but they are electrically identical to each other.
The pinout for the ALDL connection on these cars is as follows:
Female OBD connector pinout 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 For ALDL connections, pin 9 is the data stream, pins 4 and 5 are ground and pin 16 is battery voltage.
Additional vehicle-specific diagnostic and control circuits are also available on this connector. For instance, on the Corvette there are interfaces for the Class 2 serial data stream from the PCM, the CCM diagnostic terminal, the radio data stream, the airbag system, the selective ride control system, the low tire pressure warning system and the passive keyless entry system.
An OBD1.5 has also been used on Mitsubishi cars of '95 '97 vintage.
An OBD1.5 has been used in some 1995 Volkswagen VR6's (Juice Box's GTI)
Posted on Aug 16, 2008
SOURCE: 1993 E-150 - OBD I or OBD II
All cars built since January 1, 1996 have OBD-II systems. Manufacturers started incorporating OBD-II in various models as early as 1994. Some early OBD-II cars were not 100% compliant.
check the link to see which vehicles were not compliant.
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Posted on Jan 27, 2009
SOURCE: Pontiac Montana overheating
How do you know the thermostat is ok? If in doubt replace it. Water pumps are a even bigger what if. Did he do a radiator flush? Cooling system flush of the engine? Cooling fans come on at what temp and go off when? Replace the engine temperature sensor? 6 years old is bound to have sensors and such go bad.
Posted on Jun 16, 2009
SOURCE: Dlc location
try unpluging the connector to the crankshaft position sensor and then try the scanner again. i had the same problem on a 1998 cherokee and it turned out to be a small bearing(bb size) had found its way onto the end of the sensor. the scanner was unable to link with the vehicle, gauges would not work nor would the fuel pump. sounds weird i know, but i replaced the sensor and everything was ok.
Posted on Sep 06, 2009
Is the knock sensor pluged up?What engine is this?If the knock sensor is o k ,and not bad,and it is pluged up,then the code is telling you that the timming chain is out of sink.Most likely a half,or less out.A strian on the cam,could cause this,from a oil pump trying to freeze up.Or the timming chain needs to be changed out,along with all it`s components.I hope this was helpful,maybe not good news,but most likely the truth,Let us know if it was helpful if you would,If I can help,let me know.
Posted on Oct 06, 2009
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