Ford F150 Pickup. Manual — part 1490

For DTCs P0121, P0122, P2106 and P2135, check TP1 circuit only, for DTCs P0221, P0222, P2106 and
P2135, check TP2 circuit only. Measure resistance between the TP1 signal and ETCRTN at PCM harness
connector. Measure resistance between the TP2 signal and ETCTRN at PCM harness connector. Are both
resistances greater than 10 k/ohms? If yes, go to next step. If no, isolate and repair short circuit.

7) For KOEO, KOER & Continuous Memory DTC P0123: Check TP Sensor Harness For Short To
PWR
A TP PID (TP V PID) reading greater than 93 percent (4.65 volts) in KOEO, continuous memory or
KOER indicates a hard fault. Possible causes for this fault are:

z

TP sensor not seated properly.

z

TP circuit short to PWR.

z

TP circuit short to ETCREF.

z

SIG RTN circuit open to TP sensor.

z

Damaged TP sensor.

z

Damaged PCM.

For DTCs P0121, P0123, P2106 and P2135, check TP1 circuit only, for DTCs P0221, P0223, P2106 and
P2135 check TP2 circuit only. Measure resistance between the TP1 circuit, and battery power from the
TP sensor harness connector. See Fig. 164. Measure resistance between the TP2 circuit, and battery
power from the TP sensor harness connector. Are both resistances greater than 10 k/ohms? If yes, go to
next step. If no, repair short circuit.

8) Check TP Sensor Circuits For Shorts To ETCREFS

For DTCs P0121, P0123, P2106 and P2135, check TP1 circuit only, for DTCs P0221, P0223, P2106 and
P2135 check TP2 circuit only. Measure resistance between TP1 signal and ETCREF at PCM harness
connector. Measure resistance between TP2 signal and ETCREF at PCM harness connector. Are both
resistances greater than 10 k/ohms? If yes, go to next step. If no, isolate and repair short circuit.

9) Check TP Sensor Signal Shorts To Each Other In Harness

Measure resistance between TP1 and TP2 circuits at the PCM harness connector. Is the resistance greater
than 10 k/ohms? If yes, go to next step. If no, isolate and repair short circuit.

10) Check ETC TP Sensor Resistances

Ensure PCM and TP sensor harness connectors are still unplugged. Measure resistance between ETCRTN
and ETCREF through the TP sensor at closed throttle. Is the resistance between 2500 and 3600 ohms? If
yes, replace PCM for On Demand faults, clear DTCs, drive vehicle, and self-test to verify repair. If DTCs
output, or faults are only Continuous, go to next step. If no, replace ETC TP sensor.

11) For KOEO, KOER & Continuous Memory DTC P0068: Check TP Sensor Signal High Versus
The Engine Load While Driving Vehicle

NOTE:

For additional testing information, see DIAGNOSTIC AIDS.

2003 Ford Pickup F150

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

The PCM monitors a vehicle operation rationality check by comparing sensed throttle position to mass air
flow readings. If during key ON engine running self-test the comparison of the TP sensor and MAF
sensor readings are not consistent with calibrated load values, the test fails and a diagnostic trouble code
is stored in continuous memory. Possible causes are:

z

Air leak between MAF sensor and throttle body.

z

TP sensor not seated properly.

z

Damaged TP sensor.

z

Damaged MAF sensor.

Connect PCM and TP sensor connectors. Turn ignition switch to ON position, start engine. Drive vehicle,
exercising the throttle and TP sensor while accessing PIDS. Access TP2 PID and LOAD PID and record
readings. Is TP2 PID greater than 2.44 volts and the LOAD PID reading less than 30 percent? If yes,
listen for air noise around MAF sensor and throttle body while engine is running. Repair if necessary.
Otherwise, go to TEST HU, step 1) for air restriction. If okay, replace the throttle body. If no, go to next
step.

12) Check TP Sensor Signal Low Versus The Engine Load While Driving Vehicle

Drive vehicle exercising the throttle and TP sensor near higher gears (preferably overdrive) while
accessing PIDS. Access TPPS PID and LOAD PID. Is TP2 PID reading less than 0.64 volts and the
LOAD PID reading greater than 55%? If yes, tighten TP sensor to throttle body if necessary. Clear
Continuous Memory DTCs. Drive vehicle exercising the throttle. If Continuous Memory DTC P0124 or
P0224 reset, replace MAF sensor. If no, unable to identify the fault at this time. Go to next step.

13) Check For Intermittent TP Sensor Signal

Start engine and bring to idle. Run throttle up to 1500 RPM for 5 seconds. Access TP1 PID for a fault
indication while lightly taping on TP sensor and wiggling harness connector to simulate road shock.
Access TP2 PID for a fault indication while lightly taping on TP sensor and wiggling harness connector
to simulate road shock. Are the TP1 and TP2 PIDS changing below the minimum (0.49 volt) or above the
maximum (4.65 volts)? If yes, inspect the TP sensor connector. If connector is okay, replace the throttle
body. If no, go to next step.

14) Check TP Sensor For Intermittent Shorts Or Opens

Again access the TP2 PID. Turn ignition switch to ON position, with engine off. Grasp the vehicle
harness closest to the TP sensor connector. Shake and bend a small section of the harness all the way to
the dash panel. Wiggle, shake and bend the harness from the dash panel to the PCM. Access the TP1 PID,
and repeat the above procedure. Are the TP2 PID and TP1 PID readings changing below the minimum
9.85 percent (0.49 volt) or above the maximum 93 percent (4.65 volts)? If yes, isolate and repair as
necessary. If DTCS P2100 and or P2101 are present, go to next step. If not clear other DTCs, road test
vehicle, and run self-test to verify repair. If no, unable to duplicate or identify fault at this time. Go to
TEST Z, step 1). If Z1 does not identify fault, replace PCM.

NOTE:

A break in step numbering sequence occurs at this point. Procedure skips

2003 Ford Pickup F150

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

20) For KOEO, KOER & Continuous Memory DTC P2100: Check ETC Motor Visually
PCM fault flag is set indicating the motor circuit is open. May require cycling the key. Possible causes for
this fault are:

z

TACM has an open winding.

z

TACM is damaged.

z

TACM harness is open.

z

TACM harness is shorted to power.

z

TACM harness circuits are shorted together.

z

TACM harness connector is unplugged.

Ensure that the TACM harness connector is properly connected. Turn ignition switch to OFF position.
Inspect throttle body motor for damaged housing, connector, and harness. Are there any obvious faults
with the ETC motor system? If yes, repair or replace as necessary. If no, go to next step.

21) Check ETC Motor For Short Or Open

Remove ETC motor harness connector. Measure the resistance between the TACM (+) and TACM (-)
pins, through the motor. See Fig. 217. Is the resistance less than 0.8 ohm, or greater than 1000 ohms? If
yes, replace throttle body assembly. Clear DTCs and rerun self-test, if DTCs P2100, P2106 and P2112, or
DTCs P2100, P2106, P2111 and P2112 are output, go to next step. For DTCs P2100, P2106 and P2107,
go to step 23). For DTCs P2100, P2106, P2107, P2111 and P2112, go to step 24). For DTCs P2101,
P2106, P2110, P2111 and P2112, go to step 25). If no, go to next step.

22) Check ETC Motor Harness For Open

Turn ignition switch to OFF position. Disconnect PCM harness connector. Measure the resistance of the
TACM(+) circuit between the PCM and TACM harness connectors. Measure the resistance of the TACM
(-) circuit between the PCM and TACM harness connectors. Is the resistance less than 5 ohms? If yes, go
to next step. If no, repair open circuit.

23) For KOEO, KOER & Continuous Memory DTC P2107: Check ETC Motor Harness For Short
To GND, PWR, ETCREF, And ETCRTN
The ETC control area of the PCM failed self-test. Fault could be the result of an incorrect TP command,
or the TACM wires shorted together. Possible causes of this fault are:

z

TACM wire shorted together.

z

TACM circuit wires shorted to power.

z

PCM damaged.

from step 14) to step 20). No test procedures have been omitted.

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

Measure the resistance between the TACM (+) pin and TACM (-) pin, and battery ground. See Fig. 217.
Measure the resistance between the TACM (+) pin and TACM (-) pin, and battery power. Measure the
resistance between the TACM (+) pin and TACM (-) pin, and ETCRTN. Measure the resistance between
the TACM (+) pin and TACM (-) pin, and ETCREF. Are all resistances greater than 10 k/ohms? If yes,
go to next step. For DTC P2101, go to step 25). If no, isolate and repair short circuit.

24) Check ETC Motor Harness For Circuits Shorted Together

Measure the resistance between the TACM (+) pin and TACM(-) pin. Is the resistance greater than 10
k/ohms? If yes, go to next step. If no, isolate and repair short circuit.

25) For KOEO, KOER & Continuous Memory DTCs P2101 & P2110: Check FOR Crosswired
ETC Motor Harness
Throttle actuator control system is in FMEM mode of forced limited RPM. Possible causes of this fault
are:

z

PCM damaged.

z

Cross wired TACM motor.

Measure the resistance between the TACM (+) pin and TACM(-) pin. See Fig. 217. Is the resistance
greater than 10 k/ohms? If yes, go to next step. If no, properly wire the TACM per TACM and PCM
connector diagrams.

26) Self-Test Vehicle

Turn ignition switch ON, with engine Off. Clear DTCs. Cycle accelerator pedal to the floor and back
several times. Self-Test vehicle noting any DTCs. Were there any DTCs related to the ETC system? If
yes, fault is intermittent. Go to TEST Z, step 1). If no, replace PCM.

TEST FB: POWER TAKE OFF

Diagnostic Aids

Perform this test only when directed here. This system test is intended to diagnose:

z

PTO Wiring Harness Circuit

z

Powertrain Control Module (PCM)

NOTE:

For additional testing information, see DIAGNOSTIC AIDS.

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.

2003 Ford Pickup F150

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