Inherited Thunderbolt
Member
- Joined
- Aug 11, 2020
- Messages
- 36
- Reaction score
- 35
- Points
- 18
- Location
- St. Petersburg
- Vehicle Year
- Multiple
- Make / Model
- Rangers
- Transmission
- Automatic
- 2WD / 4WD
- 2WD
- Total Lift
- stock
- Total Drop
- stock
- Tire Size
- stock
- My credo
- I don't subscribe to causes that are compelled by irrational fears.
I'm having some problems trying to troubleshoot a check engine code on my Thunderbolt (2002 Ranger XLT 4x2 4.0 V6 5 speed auto), P0112. The code is being thrown because the IAT is picking up a temperature that is out of range. I have already replaced the MAF/IAT sensor and cleared the code only to have it return after about half an hour of driving. I have a 2002 ford ranger service manual and I can't seem to track down in the manual a diagnostics procedure for TSing the MAF harness. I suspect it's the wiring harness but I don't want to buy the harness and spend the time splicing the plug only to find out I have a short further up the chain, or something else.
The truck for the most part idles and runs fine; a couple of times (as in, literally twice) in the past six weeks or so it has stumbled and stalled, but started right back up and ran perfectly fine afterwards. When I pull the harness on the MAF while the truck is running, there's an audible change in the way it runs as the ECU resets to a default fuel table. Researching this on the internet turned up an old post on another forum that I couldn't make much sense out of involving the use of safety pins to pierce the harness and what appears to be incorrectly-identified wire colors.
I searched online and can't find a copy of the Powertrain Control & Emissions Diagnosis service manual (for free) anywhere, which I'm pretty sure has the procedure I'm looking for. Does anybody have the procedure for troubleshooting the MAF/IAT harness before I go throw money and time at an undiagnosed problem?
The truck for the most part idles and runs fine; a couple of times (as in, literally twice) in the past six weeks or so it has stumbled and stalled, but started right back up and ran perfectly fine afterwards. When I pull the harness on the MAF while the truck is running, there's an audible change in the way it runs as the ECU resets to a default fuel table. Researching this on the internet turned up an old post on another forum that I couldn't make much sense out of involving the use of safety pins to pierce the harness and what appears to be incorrectly-identified wire colors.
I searched online and can't find a copy of the Powertrain Control & Emissions Diagnosis service manual (for free) anywhere, which I'm pretty sure has the procedure I'm looking for. Does anybody have the procedure for troubleshooting the MAF/IAT harness before I go throw money and time at an undiagnosed problem?