Fig. 177: IAT, ECT & EOT Sensor Specifications
Courtesy of FORD MOTOR CO.
4) Check ECT Sensor Resistance With Engine Running
Reconnect all connectors. Start engine and operate at 2000 RPM for 2 minutes. Turn ignition switch to
OFF position. Disconnect ECT sensor. Using a DVOM, measure resistance between ECT sensor SIG and
SIG RTN circuit terminals. See Fig. 171. Compare sensor resistance to appropriate temperature
specification in illustration. See Fig. 177. If resistance is not as specified for, replace faulty ECT sensor.
If resistance is as specified, replace PCM.
10) For KOEO & KOER Only DTC P0113 Or P0118: Check Voltage Between VREF & SIG RTN
DTC P0113 (IAT) or P0118 (ECT) indicates IAT or ECT sensor signal is more than self-test maximum.
Maximum measurement should be 4.6 volts at -58°F (-50°C). Check for following possible causes:
z
Open Circuit In Harness Or Connector
z
Sensor Signal Short To Power
z
Faulty Sensor
NOTE:
A break in step numbering sequence occurs at this point. Procedure skips
from step 4) to step 10). No test procedures have been omitted.
NOTE:
For LS and Thunderbird with electronic throttle control, go to next step.
For additional testing information, see DIAGNOSTIC AIDS.
2003 Ford Pickup F150
2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline