2003 Ford Expedition Check engine light

Tiny
MSEMMERLING
  • MEMBER
  • 2003 FORD EXPEDITION
  • V8
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
My car engine light came on for a p0112 code. Went through fault isolation guide and change out air intake sensor then cleared code. Light came on again and gave same code. What could my problem be?
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Wednesday, April 7th, 2010 AT 9:57 PM

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Tiny
DAVE H
  • EXPERT
20) For KOEO & KOER Only DTC P0112 Or P0117: Simulate Opposite Signal To PCM
DTC P0112 (IAT) or P0117 (ECT) indicates sensor signal is less than self-test minimum. Minimum signal for IAT and ECT sensor is.2 volt or 250 F (121 C). Possible causes for these faults are:
Circuit Grounded In Wiring Harness
Faulty Sensor
Faulty Connection
Faulty PCM
Turn ignition switch to OFF position. Disconnect suspect temperature sensor connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Connect scan tool to Data Link Connector (DLC). Turn ignition switch to ON position. Using scan tool, access ECT-V or IAT-V PID from PID/DATA MONITOR & RECORD menu. For LS and Thunderbird with electronic throttle control, if PID value is 4.2 volts or less, or -40 F (-40 C) or more, go to step 22). All others, go to next step. If PID value is more than 4.2 volts, or less than -40 F (-40 C), replace faulty temperature sensor.

90) For Continuous Memory Only DTCs P0112, P0113, P0118, P1112 & P1117: Check For Intermittent
These DTCs indicate possible intermittent fault. Possible causes for these faults are:
Faulty Sensor
Faulty Sensor Connector
Open Or Grounded Circuit In Harness
Faulty PCM
Connect scan tool to Data Link Connector (DLC). Turn ignition switch to ON position. Using scan tool, access ECT-V and IAT-V PID from PID/DATA MONITOR & RECORD menu. While observing appropriate PID, tap on sensor and wiggle sensor connector to simulate road shock. If no change in PID voltage reading occurs, go to next step. If any change in PID voltage reading occurs, turn ignition switch to OFF position. Inspect connectors for loose, damaged or corroded terminals. Repair as necessary. If connectors are okay, replace faulty temperature sensor. If directed here for Continuous Memory DTCs P1112 and P1117, perform DRIVE CYCLES to verify repair. Repeat QUICK TEST.
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Friday, April 9th, 2010 AT 5:05 AM

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