SOURCE: how can i fix my mazda 626 transmission range
The transmission range sensor aka neutral safety switch is located underneath the air filter on top of the transaxle and very easy to access. Replace this part (around $50) and it will solve your problem.
What happens is this, when your tranny warms up, it disperses heat to the sensor switch and if its faulty or worn out, will send faulty relays to the transmissiom computer module (TCM) and makes the transmission shift irratically (OD to 3rd and back while driving at freeway speeds). You tranny is not overheating like most people believe, its the switch. Mechanics are telling alot of people that their tranny needs replaced. Watch Out For These People!! They only want your money!!
SOURCE: I have a 1999
Hello! The culprit is the Throttle Positioning Sensor (TPS)...Since it was replaced, The problem is more then likely the connector...Pull connector and inspect for dirty or corroded, or broken pins/wires...Do you have a multimeter and a little experience using it? If so the circuit can be easily tested...The TPS connector has three wires...colors are...Gray/Red...
Violet/Yellow...And Black/Yellow...Using safety pins...Insert pin into the rear of the in-place connector on the Gray/Red wire...Another in the rear of the connector on the Black/Yellow wire...Place the + probe of meter on the Gray/Red and the - probe on the Black/Yellow...Set meter to read 5 volts...Start the engine...Meter must read +5 volts...Move the + probe and safety pin and insert into the Violet/Yellow wire...At idle reading should be less then 1 volt (.85)...Slowly increase the throttle to full...At full throttle meter should read 4 volts...The main issue here is that the voltage increases without jumping or erratic movement...If the reading does not increase smoothly the TPS or it's connector are at fault....Codes P1125 and P0122 are TPs related...P0400 is an EGR fault...The Gray/Red wire is the +5 reference voltage for both TPS and EGR sensors...Tell me what you find...Saailer
I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867
SOURCE: 2000 mazda millenia has p0400 code, need to know how to fix
It could be the EGR valve or a circuit.
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