MAF or computer

[bullmastiff79]

Hi! I have an issue with my 93 Ford Explorer 4x4 4.0 automatic. I'm receiving error code 157 in both the koeo and koer. I have replaced the maf with a new unit and I'm still getting the same code. I'm also getting code 998 with engine running. I have tested the voltage to the maf as normal. I have tested the voltage from the maf to the computer at the maf and at the computer on the blue/red wire at 1.2v to 1.6v. Would this indicate a bad computer, maf or other issue? I would appreciate any imput before spending any more $ on parts. Thanks in advance.

The 1.2v was at idle and the 1.6v at about 4000rpm. Also, would limp home mode cause the electronic torque converter to not lock up?

Thanks again

 

[2000StreetRod]

pushed back pin?

157 Mass Air Flows Sensor Circuit Below Minimum Voltage
998 Hard Fault Present

I'm not familiar with the 1st Generation but on the 2nd Generation PCM connector sometimes a pin will get pushed back into the connector and not make contact with the PCM.

 

[bullmastiff79]

Thanks for the suggestion. I'll double check that tomorrow

 

[bullmastiff79]

Pins looked good. I've cleaned the pins and wiring harness connection with electronic contact cleaner.