Mechanics

MAZDA MX3 TERMINAL PROBLEM

1993 Mazda MX3 • 220,000 miles

Car wants to die at a stop. When accessories are turned at idle like heater, lights, or touching brake pedal rpm's drop so low it dies. Recently tuned up, new vacuum hoses, new maf, no codes, tested iac valve and tps both react how their supposed to when unplugged and resistance is in correct range, injectors are clicking fine, cleaned throttle body and air boot, alternator is putting out 14.5 volts, new fuel pump and filter. Pressure is good, vacuum guage reads about 20 steady. Any ideas?
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Gatertamer
January 5, 2013.



Refer to chart


KHLow2008
Jan 7, 2013.
Thank you for diagrams. Not quite sure about step 6 what is voltage supposed to be. With key on or off. Dist connected or not. And step 5 how do you check for ground. Step 8 with dist disconnected but is key on or off. Thank you


Tiny
Gatertamer
Jan 8, 2013.
When checking voltage, the ignition must be ON.

When checking for ground it means check for shorts. One end of ohmmeter to wire/terminals and the other to body.

Is your vehicle Federal or California Specifications?


KHLow2008
Jan 8, 2013.
Its federal. Just dont know when it says is voltage ok what is voltage supposed to be?


Tiny
Gatertamer
Jan 11, 2013.
Is there an easy way to check and see if internal voltage regulator is working correctly?


Tiny
Gatertamer
Jan 18, 2013.
Sorry for the delay in replying. Was away for the past week.

Here are the pin voltage chart.


KHLow2008
Jan 22, 2013.
Thanks for diagrams. Did step 6.(Tested ecu terminal voltage from dist.). It was 5 volts with key on but stayed 5 volts at idle it didnt drop to 1.5V like it should. The 2E terminal was at 5V with key on and dropped to 2V at idle. Like it should. There is continuity between dist. Wire and ecu. Step 7 tested at 5V and it says replace dist. However when performing step 8 there is no voltage and it says replace ecu. Does step 7 superceed step 8 because it tested at 5V and it says replace dist. If it were you which one would you replace?


Tiny
Gatertamer
Jan 26, 2013.
Any fault with the ECU takes precedence over others.
Anyway step 6 showed voltage, why does the voltage disappears when measured at ECU?


KHLow2008
Jan 27, 2013.
It asks for the dist. Connector to be disconnected. Im assuming thats why there is no voltage. Also distributors are sold with or without modules what does that mean? And could it be just a bad module in dist. And I dont need to replace entire thing?


Tiny
Gatertamer
Jan 27, 2013.
If the module comes separately, you can just replace that because the problem is only within the module circuit. However you need to check/test the wiring circuit within the distributor as it could be bad wires as they become brittle over time and any movement of them can result in breakages/poor continuuity.


KHLow2008
Jan 27, 2013.
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