help with mat and code 53
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Joined: Jan 2001
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From: west Point MS USA
help with mat and code 53
I got a code 25 and my car fan fine for two days.This morning when I got to work it died.I cranked her up but she wouldn't stay running.Now I got a code 53 for high voltage along with 25.She is trying to flood out.Is it the mat or what?
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Joined: Feb 2004
Posts: 1,231
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From: Greenville, SC
Car: 1991 Chevy Camaro
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3.42
Code 25-MAT Sensor- Temp high, poor electrical connection, open or short in circuit; defective MAT sensor; defective ECM
Well, the MAT (Manifold Air Temperature) sensor may be the problem. The first thing to check is if it's plugged in or not. The MAT, more commonly known as the IAT (Intake Air Temperature) sensor, is located towards the rear of the air filter housing. It's round and has a 2-wire connector going into it. Check the wiring to it for burns, cracks, cuts, or chaffing. With the KOEO (key on, engine off), disconnect the 2-wire connector and check for 5-volt reference through one of the wires and ground through the other wire, just to make sure the wiring is not at fault.
It may be a good idea to disconnect the negative battery cable for a minute, reconnect it, and drive the car around again. This is just to make sure that code 25 is still occuring, and not just store in the computer's memory from the two days the SES light was on.
EDIT: Check the resistance of the MAT, or IAT sensor. If it's out of spec, than it's time to replace it. Here's a chart to compare:
Well, the MAT (Manifold Air Temperature) sensor may be the problem. The first thing to check is if it's plugged in or not. The MAT, more commonly known as the IAT (Intake Air Temperature) sensor, is located towards the rear of the air filter housing. It's round and has a 2-wire connector going into it. Check the wiring to it for burns, cracks, cuts, or chaffing. With the KOEO (key on, engine off), disconnect the 2-wire connector and check for 5-volt reference through one of the wires and ground through the other wire, just to make sure the wiring is not at fault.
It may be a good idea to disconnect the negative battery cable for a minute, reconnect it, and drive the car around again. This is just to make sure that code 25 is still occuring, and not just store in the computer's memory from the two days the SES light was on.
EDIT: Check the resistance of the MAT, or IAT sensor. If it's out of spec, than it's time to replace it. Here's a chart to compare:
Last edited by Benm109; Dec 18, 2004 at 11:29 AM.
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