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