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| ODB1 (ECCS) Electronic Concentrated Control System | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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ECCS has five modes Mode 1 - Exhaust Gas Sensor monitor. When the engine is warm (closed loop) the green led turns on for lean, off for rich. It should alternate. When it is cold (open loop) it will be either on or off. Mode 2 - Mixture ratio feedback control monitor. During closed loop operation the red led should turn on and off simultaneously with the green led when the mixture is controlled within the specified values. During open loop the red led stays on or off. Mode 3 - Self Diagnosis. See below Mode 4 - Switches On/Off diagnosis. The inspection lamp monitors the idle switch portion of the throttle valve switch, the starter switch, vehcle speed sensor an other switches with an on/off condition. Don't really know how this works! Mode 5 - Real Time diagnosis. Same as Mode 3, but it flashes the errors as they occur. Can see what is happening while you are driving...assuming you can drive AND have your head under the seat :-) Here's how to select the various modes:
Reading Trouble Codes: The Red LED = 10, the Green LED = 1, so if you get 3 red flahes followed by 5 green flashes you have code 35. If 35 is the only code it will keep repeating. If there are other faults it will cycle trough all of them and then repeat. The ECU will reset to Mode 1 when you turn the ignition off again. 1.Access the ECU from under the R.F. seat and position it for observing the diodes. 2.If the engine does not run, turn the key on and proceed to step #4. 3.Start the engine and warm it to operating temperature then idle. 4.Turn the diagnostic mode selector on the ECU fully clockwise until both diodes flash 3 times then turn the selector fully counterclockwise. The ECCS system is now in mode 3. 5.If the diodes do not illuminate, refer to ELECTRICAL COMPONENT AND CIRCUIT DIAGNOSIS and perform the ECU MAIN POWER AND GROUND CIRCUIT test. 6.Observe the diodes and note the code(s) displayed. Note: Code 55 indicates all systems are OK. If you get one of the codes it will give us some idea of where the problem is, then we can maybe figure what needs to be looked at. CODE NO: DETECTED
ITEMS ERASING DIAGNOSTIC CODES 1.Turn the ignition
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OBD II TOOLS
& EQUIPMENT • Aftermarket scan tools with the appropriate software and J-1962 16-pin universal
diagnostic connector. If you already own an up-to-date scan tool, all
you may need is a new software update and OBD II wiring connector. On
the other hand, if your scan tool is more than four or five years old,
it may not be OBD II-upgradable. Before you upgrade or replace a scan
tool, make sure the new tool will provide the dealer-enhanced codes
as well as the generic codes for the import vehicles you service most
often. This usually isn’t a problem with the Asian makes, • Dealer scan
tool. The main advantage you’ll enjoy with a dealer scan tool is
access to all of the same data and capabilities as the car dealers,
which often includes enhanced diagnostic capabilities and two-way communication.
The drawback with a dealer scan tool is that it can only be used on
a particular make of vehicle, unlike aftermarket scan tools which work
on a variety of makes. Cost is also a major hurdle, with some dealer
scan tools costing several times as much as a typical • OBD II code
reader. In recent years, a number of equipment suppliers have introduced
relatively low cost • Scanner software for a laptop personal computer (PC), Palm or Handspring Visor personal digital assistant (PDA). Software and wiring connectors are available to convert a laptop PC or PDA into a basic scan tool. You can read and clear codes, read and display system data in numeric or graphic formats, check readiness monitors, capture snapshot data and more depending on thecapabilities of the software. If you already own a PC or PDA, going this route may be a more affordable alternative to upgrading or buying a new scan tool. PC and PDA software packages typically sell for around $350 and include the J-1962 16-pin universal diagnostic connector. If you’re considering purchasing a PDA, look for one that has an expansion slot and sufficient memory to handle future upgrades. If a vehicle has
an OBD II EVAP code (P0400 series codes), you may need some type of
leak detection equipment to find the cause. Choices here include ultrasonic
leak detectors that listen for sound waves produced by air or vapors
escaping through an opening, smoke detectors that generate smoke which
allows leaks to be spotted visually, and dye detectors that use a
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