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#1
April 14th 05, 02:23 AM
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DTC codes
Where at the Alldata site are the tables of DTC codes? My 1996 Grand Voyager is reporting a code of 72 which isn't in the table in my 96 factory service manual (the highest code is 71). I'm assuming that there was a later update to the manual that I don't have. Matt 
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#2
April 14th 05, 02:30 AM
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Code is catalyst efficiency failure (P0420) in the 97 service manual.
Bill "Matt Whiting" > wrote in message ... > > Where at the Alldata site are the tables of DTC codes? My 1996 Grand > Voyager is reporting a code of 72 which isn't in the table in my 96 > factory service manual (the highest code is 71). I'm assuming that there > was a later update to the manual that I don't have. > > > Matt
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#3
April 14th 05, 02:43 AM
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Bill wrote:
> Code is catalyst efficiency failure (P0420) in the 97 service manual. > > Bill > > "Matt Whiting" > wrote in message > ... > >>Where at the Alldata site are the tables of DTC codes? My 1996 Grand >>Voyager is reporting a code of 72 which isn't in the table in my 96 >>factory service manual (the highest code is 71). I'm assuming that there >>was a later update to the manual that I don't have. >> >> >>Matt > > > Thanks. Any idea how the ECM can tell that the cat isn't working? Matt
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#4
April 14th 05, 03:03 AM
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"Matt Whiting" > wrote in message ... > Bill wrote: > >> Code is catalyst efficiency failure (P0420) in the 97 service manual. >> >> Bill >> >> "Matt Whiting" > wrote in message >> ... >> >>>Where at the Alldata site are the tables of DTC codes? My 1996 Grand >>>Voyager is reporting a code of 72 which isn't in the table in my 96 >>>factory service manual (the highest code is 71). I'm assuming that there >>>was a later update to the manual that I don't have. >>> >>> >>>Matt >> >> >> > > Thanks. Any idea how the ECM can tell that the cat isn't working? > > > Matt Under certain operating conditions (hot engine, steady throttle, minimum speed and engine temp and specific load) the PCM monitors the difference in switching rates between the upstream and the downstream oxygen sensors. Bill
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