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