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2000 Ford Ranger 4x4: p100..I am not sure where to start looking

I am looking at a...
I am looking at a 2000 Ford Ranger 4x4 to but. Code P1400 and P1780 come up on scan test. I am not sure where to start looking. Is this a serious problem or an easy fix. Also, there seems to be "thrown" oil on the underbody and frame in the area of the differentil. Could this be a bad seal.
Thanks, Ed
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Answered in 15 minutes by:
9/10/2009
Eric
Eric, Automotive Repair Shop Manager
Category: Ford
Satisfied Customers: 32,773
Experience: Automotive Repair Shop Manager, Technician
Verified

Hi,

 

 

P1400 DPFE (Differential Pressure Feedback EGR) circuit low input

 

This normally due to a faulty dpfe sensor and is located above the left exhaust manifold and egr valve tube. The dpfe sensor runs under $50 and takes about 15-20 minutes to replace:

 

graphic

 

P1780 Trans control switch (O/D cancel) out of self test range

 

This code normally comes on because the test procedure with scanner was not done correctly.

 

When doing the key on engine on test, you have to press brake pedal,turn steering wheel 1/4 turn, and press OD button on then off. Failure to do this will set this code.

 

I would have this code reset, then see if it returns. If it does and the test is done correctly, then the o/d switch in shifter is bad

 

 

As far as the leak, it could from a bad seal tailshaft housing, or even cracked case. The only way to find out is to clean it off, run it for a day or two and get it up in the air for a thorough inspection

 

 

Please click the ACCEPT BUTTON or ask for more help

Eric
Eric, Automotive Repair Shop Manager
Category: Ford
Satisfied Customers: 32,773
Experience: Automotive Repair Shop Manager, Technician
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