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Old 09-14-2018, 04:40 PM   #1
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Default Malfunctioning ECM?

Sorry i think i posted on the wrong section, general discussion, and couldn't figure out how to move the thread or delete it.

It has been throwing codes:
P0102 Mass or Volume Air Flow Circuit Low Input
P0350 Ignition Coil Primary/Secondary Circuit Malfunction
P0351 Ignition Coil A Primary/Secondary Circuit Malfunction
P0352 Ignition Coil B Primary/Secondary Circuit Malfunction
P0340 Camshaft Position Sensor Circuit Malfunction

At first it was just the MAF and Camshaft codes, i fixed the MAF and before i fixed the Camshaft sensor the MAF code came back. After that Code 350 showed up and my primary ignition coil was not firing on cylinder 1, so replaced it and the code went away. Week later all these codes showed up.

I have noticed that the truck runs decent when i leave the battery unplugged. After 10-15 minutes the problems come back.

For the codes 350-352 i rechecked the primary coil and it no longer fires any cylinders. I plugged it into the secondary and it works fine. I checked the primary using this video:
and this guide:
and found it to be missing the switching signal.

any help would be much appreciated as i don't know if all the problems are related , failing ecm, or something else might be my problem.
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Old 09-14-2018, 06:44 PM   #2
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Yes, could be ECM at this point, I would pull off it's 104 wire connector and make sure there is no corrosion inside.
You could test the 4 coil Ground wires at this connector, make sure the wires are good, they will be color matched.

If all checks out then replace ECU
California needed a Calif ECU usually, they had different emissions standards than other states
1995 was first year of the 104 wire ECUs in Rangers
You may be able to use 1995-1997 but not sure, 1998 got the 2.5l 4cyl engines

Same engine size ECU
ECUs come in Automatic Trans or Manual trans versions, that needs to match what you have.
2WD or 4x4 didn't matter

Last edited by RonD; 09-15-2018 at 11:39 AM.
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