MAF check engine light and transmission help

[CTScott]

P0103 is Mass or Volume Air Flow Circuit High Input. Unfortunately, because of the bridge arrangement within the sensor, a Circuit High Input and a Circuit Low Input will give the same results, so you can't tell whether the sensor is open or shorted.

If you look at page 91 of the "Engine Control" section of the service manual, it shows how to check for continuity between the ECM connector and the MAF connector. Doing so will verify if the issue is a wire issue or sensor issue.

The service manual can be downloaded from Micro Image:

http://www.microimageonline.com/foru...32-YARIS-FILES

[heeroyuy01195]

Originally Posted by CTScott

P0103 is Mass or Volume Air Flow Circuit High Input. Unfortunately, because of the bridge arrangement within the sensor, a Circuit High Input and a Circuit Low Input will give the same results, so you can't tell whether the sensor is open or shorted.

If you look at page 91 of the "Engine Control" section of the service manual, it shows how to check for continuity between the ECM connector and the MAF connector. Doing so will verify if the issue is a wire issue or sensor issue.

The service manual can be downloaded from Micro Image:

http://www.microimageonline.com/foru...32-YARIS-FILES

With both the C20 and C26 connectors disconnected as per the manual, my multimeter read stayed fixed at 1 for every test point. (The multimeter stays at 1 while not connected to anything during resistance checks so I'm assuming that it did not read any resistance?)

With the C20 ECM connector CONNECTED and the C26 MAF connector DISCONNECTED I got these values:
Check for Short
15.22k ohm

Check for Open
75.3K ohm

The check for open seems crazy high compared to what was stated in the manual.

[CTScott]

Originally Posted by heeroyuy01195

With both the C20 and C26 connectors disconnected as per the manual, my multimeter read stayed fixed at 1 for every test point. (The multimeter stays at 1 while not connected to anything during resistance checks so I'm assuming that it did not read any resistance?)

With the C20 ECM connector CONNECTED and the C26 MAF connector DISCONNECTED I got these values:
Check for Short
15.22k ohm

Check for Open
75.3K ohm

The check for open seems crazy high compared to what was stated in the manual.

With the connectors disconnected, you should be measuring from the ECM connector to the MAF connector for each signal wire. Is that what you were doing when your meter showed the open circuit indication?