The
diagnostic connectors are located at the right side of the battery and are
covered by rubber boots to protect from splash. These connectors do not
provide the more sophisticated serial data like some of the newer cars, but
provide voltage test points for most of the key circuits in the computer
system. The connectors themselves are standard Molex 6 and 15-pin types
available at any good electronic parts source.
DETAILS
Below are diagrams of the two diagnostic
connectors listing which pins do what. D2 pin 1 is shown as
the PCV Shutoff Solenoid, but this was removed from my car a few years ago in
a factory recall and was replaced with a straight-through hose.
Those who know how to use a good voltmeter
(at least 10 megohms input impedance) may want to look farther down this page.
The Thermal Electric Switch
should be LO if the air cleaner air temperature is below 65?
(nominal). In any case, it should go HI once the engine is warmed up
11
Once the engine is warmed up
and the computer is operating, the stepper motor signals should
continously alternate quickly between HI and LO. This corresponds
with the movement of the metering pins in the carburetor.
12
The Coolant Temperature switch
should be HI until the engine reaches a nominal 135?, and then
should go LO as the switch closes. On my engine this happens as the
temperature gauge needle has begun to move but is not yet above the
"C".
15
The 4" Hg vacuum switch
should be HI at idle. It is tied to ported vacuum and
should go LO as the throttle is gradually opened and the ported
vacuum reaches 4".
The computer sits inside the car over the heater and is held in place
by one Phillips screw. Here is a diagram of the connectors, both on the computer (MCU) and the wire
harness.
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The
diagnostic connectors are located at the right side of the battery and are
covered by rubber boots to protect from splash. These connectors do not
provide the more sophisticated serial data like some of the newer cars, but
provide voltage test points for most of the key circuits in the computer
system. The connectors themselves are standard Molex 6 and 15-pin types
available at any good electronic parts source.
