Ford F150 Pickup. Instruction - part 1466

shutdown strategy function is the same on vehicles with and without oil temperature sensors. Possible 
causes for this fault are: 

z

Very high engine RPM for extended period of time.  

z

Over-heating condition.  

z

Malfunction EOT sensor or circuit (vehicles w/EOT sensor).  

z

Base engine concerns.  

Engine oil temperature protection strategy in PCM has been activated. Check for engine overheating 
condition or engine mechanical concern. If concern is found, repair as necessary. If no concern is found, 
go to next step. 

131) Check For EOT Sensor 
 
Engine oil temperature strategy can be activated in PCM with or without an EOT sensor. Ensure vehicle 
is equipped with an EOT sensor. If vehicle is equipped with an EOT sensor, go to step 111). If vehicle is 
not equipped with an EOT sensor, advise customer that an improper transmission gear selection, or 
excessive engine RPM for an extended period of time may have activated engine protection strategy in 
PCM.  

TEST DB: ENGINE FUEL TEMPERATURE SENSOR 

Diagnostic Aids 

Perform this test only when directed by QUICK TEST. EFT sensor will operate within the range of -40 to 275°
F (-40 to 135°C). This system test is intended to diagnose the following components and circuits:  

z

EFT Sensor  

z

Wiring Harness Circuits (EFT & SIG RTN)  

z

Powertrain Control Module (PCM)  

EFT SENSOR SPECIFICATIONS 

(1)

 

NOTE:

After each service or repair procedure has been completed, reconnect all 
components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-
V systems are working properly and DTCs are no longer present.

Temperature °F (°C)

Volts

k/Ohms

-40 (-40)

4.54

92.50

50 (10)

3.51

58.75

68 (20)

3.07

27.30

86 (30)

2.60

24.27

104 (40)

2.13

16.15

122 (50)

1.70

10.97

140 (60)

1.33

7.70

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline

  

Testing 

1) KOEO & KOER DTC P0181: Check For KOER DTCs 
This DTC indicates EFT sensor voltage fell below or exceeded a calibrated limit and amount of time 
during self-test. Check for following possible causes: 

z

Open or Short Circuit In Wiring Harness  

z

Low Ambient Temperature Operation  

z

Faulty Harness Connector  

z

Faulty EFT Sensor  

z

Faulty PCM  

Start engine and bring engine temperature to normal operating temperature. Perform KOER ON-
DEMAND SELF-TEST. If DTC P0182 or P0183 is present with DTC P0181, go to next step. If only 
DTC P0181 is present, clear DTCs. Perform DRIVE CYCLES. Ensure OBD-II DRIVE CYCLE is 
performed to verify repair. Repeat QUICK TEST. If DTC P0181 is still present, go to next step. 

2) KOEO & KOER DTC P0180, P0181, P0182 Or P0183: Simulate Opposite EFT Signal To PCM 
These DTCs indicate EFT sensor voltage fell below or exceeded a calibrated limit and amount of time 
during self-test. Check for following possible causes: 

z

Open Or Short Circuit In Wiring Harness  

z

Low Ambient Temperature Operation 

158 (70)

1.02

5.37

176 (80)

0.78

3.84

194 (90)

0.60

2.80

212 (100)

0.46

2.07

230 (110)

0.35

1.55

248 (120)

0.27

1.18

275 (135)

0.19

.81

302 (150)

0.13

.56

(1)

Values may vary by 15 percent.

NOTE:

Fuel Rail Pressure (FRP) sensor may also be known as Injection Pressure (IP) 
sensor. Engine Fuel Temperature (EFT) sensor may also be known as Fuel Rail 
Temperature (FRT) sensor.

NOTE:

For additional testing information, see DIAGNOSTIC AIDS.

NOTE:

For additional testing information, see DIAGNOSTIC AIDS.

NOTE:

If a scan tool communication concern exists, remove jumper wire and go 
to step 5).

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline

  

z

VREF Open Or Shorted (P0182)  

z

Open Or Short To PWR (P0183)  

z

Faulty Wiring Harness Connector  

z

Faulty EFT Sensor  

z

Faulty PCM  

Turn ignition switch to OFF position. Disconnect EFT sensor connector. With scan tool connected, turn 
ignition switch to ON position. Using scan tool, access EFTA-V PID from PID/DATA MONITOR & 
RECORD menu. Record EFTA-V PID reading. Connect jumper wire between EFT and SIG RTN circuit 
terminals at EFT sensor harness connector. See Fig. 178. 

Record new EFTA-V PID reading. If EFTA-V PID value is more than 4.5 volts, or -40°F (-40°C) with 
sensor disconnected and less than .21 volt, or 275°F (135°C) with jumper wire connected, turn ignition 
switch to OFF position and replace EFT sensor. If EFTA-V PID value is not as specified, turn ignition 
switch to OFF position and proceed as follows:  

z

If EFTA-V PID reading is less than 4.5 volts with EFT sensor disconnected and jumper wire 
removed, go to next step.  

z

For DTC P0182, go to next step.  

z

If EFTA-V PID reading is more than .2 volt with EFT sensor disconnected and jumper wire 
connected, go to step 5).  

z

For DTC P0183, go to step 5).  

3) Check VREF Voltage To FRP Sensor 
 
Turn ignition switch to OFF position. Disconnect Fuel Rail Pressure (FRP) sensor connector. Turn 
ignition switch to ON position. Using a DVOM, measure voltage between VREF and SIG RTN circuits at 
FRP sensor harness connector. See Fig. 179 or Fig. 180 . If voltage is 4-6 volts, go to next step. If voltage 
is not 4-6 volts, go to TEST C, step 1). 

4) Check EFT Circuit For Short To SIG RTN In Harness 
 
Turn ignition switch to OFF position. Ensure EFT sensor is disconnected. Disconnect PCM connector(s). 
Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Using a DVOM, 
measure resistance between EFT and SIG RTN circuits at PCM harness connector. See PCM 
CONNECTOR IDENTIFICATION and Fig. 178. If resistance is more than 10 k/ohms, replace PCM. 
If resistance is 10 k/ohms or less, repair short between circuits. 

5) Check EFT Signal For Short To VREF 
 
Using a DVOM, measure resistance between EFT and VREF circuits at PCM harness connector (both 
VREF circuits on 150-pin PCM). See PCM CONNECTOR IDENTIFICATION and Fig. 178. If 
resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short between 
circuits. 

6) Check EFT SIG & SIG RTN Circuits For Open In Harness 

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline

  

 
Using a DVOM, measure resistance of EFT and SIG RTN circuits between PCM harness connector and 
EFT sensor harness connector. See Fig. 178. If both resistance measurements are less than 5 ohms, 
replace PCM. If either resistance measurement is 5 ohms or more, repair open in affected circuit. 

7) Continuous Memory DTC P0183: Intermittent Check 
These DTCs indicate possible intermittent fault. Possible causes for these faults are: 

z

Faulty Sensor Or Connector  

z

Faulty Wiring Harness  

z

Faulty PCM  

Turn ignition switch to ON position. Using scan tool, access EFT-A PID from PID/DATA MONITOR & 
RECORD menu. While observing PID reading, tap on sensor and wiggle sensor connector to simulate 
road shock. If no change in PID temperature reading occurs, go to next step. If any change in PID 
temperature reading occurs, inspect connectors for loose, damaged or corroded terminals. Repair as 
necessary. If connectors are okay, replace EFT sensor. 

8) Continuous Memory Only DTC P0180 & P0182: Check Sensor Wiring Harness 
While observing EFT-A PID, wiggle and bend small sections of wiring harness working from sensor and 
going toward PCM. If no change in EFT-A PID temperature reading occurs, fault is not present at this 
time. If a large change in EFT-A PID temperature reading occurs, isolate fault and repair as necessary. 
Clear DTCs and repeat QUICK TEST.  

NOTE:

For additional testing information, see DIAGNOSTIC AIDS.

NOTE:

For additional testing information, see DIAGNOSTIC AIDS.

 

2003 Ford Pickup F150 

2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline