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- Newsgroups: rec.autos.tech
- Path: sparky!uunet!wupost!sdd.hp.com!caen!destroyer!fmsrl7!slee01!tgl
- From: tgl@slee01.srl.ford.com (Tom Leone)
- Subject: Re: SURVEY: Home mech's favs>> newer cars and computer gizmos
- Message-ID: <BtAIv8.BD9@fmsrl7.srl.ford.com>
- Sender: usenet@fmsrl7.srl.ford.com (0000-Admin(0000))
- Organization: Ford Motor Company Scientific Research Labs, Dearborn, MI
- References: <Bt5pCo.5yo@world.std.com>
- Date: Thu, 20 Aug 1992 16:23:29 GMT
- Lines: 39
-
- ibe@world.std.com (ira b ekhaus) writes:
- : He made the point that if you have a PC, a $200 dollar device can give
- : you a very sophisticated home device for diagnosing the newer cars.
- : How useful are these devices, any first hand experiences?
-
- Actually, most cars have a provision for "do-it-yourself"
- diagnostics that does not require the expensive equipment. I
- have personal experience with late-model Fords and Chryslers.
-
- Basically, the engine computer is capable of detecting many
- kinds of failures like short or open circuits on its sensors, or
- coolant temperature not behaving as expected. When it detects a
- failure, it stores an error code in its memory. If the failure
- is bad enough, it also lights up the "check engine" light.
-
- You can recover these error codes from the computer very
- easily. On a Chrysler, just turn the ignition on and off three
- times, and it will flash the "check engine" light at you in a
- code sequence. The service manual tells you what each error
- code means. On a Ford, you have to find a certain connector in
- the engine compartment, and jumper two wires together. Then it
- will flash the "check engine" light at you (if it has no light,
- it flashes a voltage on a third wire of the connector).
-
- Of course, the expensive diagnostic machines are capable of
- performing other tests, such as ignition and exhaust emissions.
- But for the do-it-yourselfer, these computer error codes are a
- big help.
-
- An interesting side note: Upcoming regulations called "OBD-II"
- (On-Board Diagnostics phase II) require standardization of all
- error codes and the connector for retrieving them. I think they
- may also require provision for inexpensive retrieval of error
- codes as well. Even if they don't, I would imagine that a cheap
- aftermarket probe will become available once everyone is
- standardized.
-
- Happy diagnosing!
- Tom Leone <tgl@slee01.srl.ford.com>
-