Madza Charging System

Gary Diagnostician Stratford, New Jersey Posted   Latest  
Discussion
Electrical
Check Engin Light On P2503

HI guys just joined the group. Posting this in hopes that someone out there has a "good" scope pattern of the Madza computer controlled charging system. Got called out on the above car with a P2503 code (Gen output voltage no signal). The car is charging at 14.1v. A scope test of the 2 smaller wires going to the alternator with the U-scope (love that scope) shows on the Green wire (command from the PCM) a hashy pattern around the 0 to 1 v range. other comments on another forum say 0 to 1.5 square wave. The yellow/red (signal back to the PCM) should have a 0 to 10v square. Mine was around 0 to 3v square. Both of these voltages are with the car running. Unable to find a "known good" pattern on line , IATN had something close. Many comments about reman alternators. This car has had 3 before I got there. It sure looks like this could be number 4. Does anyone have a Known good pattern of the green and yellow/red wires car running?

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Craig Technician
White House, Tennessee
Craig Default
   

Doesn't show what kind of vehicle? Mazda what?

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Gary Technical Support Specialist
Rochester, New York
Gary Default
 

Sorry should have said 2005 Madza 6 2.3L

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Craig Technician
White House, Tennessee
Craig Default
 

Tell them it needs the Mazda alternator....lol Been kicked hard by this one time. The aftermarket alternators don't give the correct signal back. I can't give you a pattern specifically. I just know that for some reason that 05 Mazda/Ford product needs the factory alternator.

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John Technician
Sarasota, Florida
John Default
 

Craig, Good advice. I have seen that before also.

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Lance Mechanic
Columbus, Ohio
Lance Default
 

I also have been hit over the head with this,only 2 alternators 3rd was from mazda,problem SOLVED​.​THAT was about 2 years AGO​.​ITS that way with honda/acura dealer part ONLY​.​HONDA/ACURA also on power steering pumps.

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