Ford F150 Pickup. Instruction — part 1580

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Faulty Clutch Pedal Position (CPP) Switch

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Faulty Park/Neutral Position (PNP) Switch

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Wiring Harness Circuits (CPP, PNP & SIG RTN). See Fig. 358-Fig. 361 .

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Faulty Powertrain Control Module (PCM)

Fig. 358: Identifying CPP & PNP Switch Circuits & Connector Terminals (ZX2)
Courtesy of FORD MOTOR CO.

2003 Ford Pickup F150

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

Fig. 359: Identifying CPP Switch Circuits & Connector Terminals (Focus)
Courtesy of FORD MOTOR CO.

Fig. 360: Identifying CPP Switch Circuits & Connector Terminals (Explorer, Explorer Sport, Explorer
Sport Trac & Ranger)
Courtesy of FORD MOTOR CO.

2003 Ford Pickup F150

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

Fig. 361: Identifying CPP Switch Circuits & Connector Terminals (Pickup)
Courtesy of FORD MOTOR CO.

Testing

1) For KOEO & Continuous Memory Only DTC P0704, & For KOEO & KOER Only DTCs P1705
& P1709: Check CPP Or PNP Switch Function
These DTCs indicate CPP or PNP voltage was high when it should have been low. Possible causes are:

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CPP Or PNP Circuit Shorted To B+ Or VPWR

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Faulty CPP Or PNP Switch

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CPP SIGRTN Or PNP SIGRTN Circuit Open

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Faulty Powertrain Control Module (PCM)

Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Ensure clutch
pedal is applied and transmission is in Neutral or move gearshift lever from Neutral, then into gear, and
back to Neutral. Turn ignition switch to ON position. Using scan tool, access CPP/PNP PID from
PID/DATA MONITOR & RECORD menu. Observe CPP/PNP PID while applying and releasing clutch
pedal. If CPP/PNP PID does not cycle ON and OFF, go to next step. If CPP/PNP PID cycles ON and
OFF, fault may be intermittent. Check PCM harness connector for loose, damaged or corroded terminals.
Repair as necessary. If connector is okay, replace PCM.

NOTE:

For additional testing information, see DIAGNOSTIC AIDS.

NOTE:

On M/T models, clutch pedal must be applied. On ZX2, automatic
transmission must be in Neutral during self-test. In the following steps,
references to gearshift lever or to PNP switch or PNP circuits are for ZX2
only.

2003 Ford Pickup F150

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

2) Check CPP Or PNP Switch Resistance

Turn ignition switch to OFF position. Locate CPP switch near clutch pedal or PNP switch near
transmission shift linkage. Inspect switch and bracket for damage and repair as necessary. Disconnect
CPP or PNP switch connector. Inspect connector for loose, damaged or corroded terminals. Repair as
necessary. Using a DVOM, measure resistance between CPP or PNP switch terminals while applying
clutch pedal or with the shift lever in neutral. If resistance is less than 5 ohms, go to next step. If
resistance is 5 ohms or more, replace CPP or PNP switch.

3) Check CPP/PNP Switches Resistance

Ensure CPP and PNP switch connectors are disconnected. Using a DVOM, measure resistance between
CPP switch terminals with clutch pedal up. Using a DVOM, measure resistance between PNP switch
terminals with shift lever in gear. If resistance measurement is less than 5 ohms, replace CPP or PNP
switch. If resistance measurement is 5 ohms or more, go to next step.

4) Check CPP/PNP Circuit For Open In Harness

Turn ignition switch to OFF position. Disconnect scan tool from DLC. Disconnect PCM connector(s).
Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Using a DVOM,
measure resistance of SIG RTN circuit between PCM harness connector and CPP or PNP switch harness
connector. Also, measure resistance of CPP or PNP circuit between PCM harness connector and CPP or
PNP switch harness connector. See PCM CONNECTOR IDENTIFICATION and Fig. 358-Fig. 361 .
If both resistance measurements are less than 5 ohms, go to next step. If either resistance measurement is
5 ohms or more, repair open circuit.

5) Check CPP/PNP Circuit For Short To SIG RTN Or Chassis Ground In Harness

Using a DVOM, measure resistance between CPP/PNP and SIG RTN circuits at PCM harness connector.
Using a DVOM, measure resistance between chassis ground and CPP/PNP circuits at PCM harness
connector. If both resistance measurements are more than 10 k/ohms, replace PCM. If either resistance
measurement is 10 k/ohms or less, repair short in appropriate circuit.

TEST TB: TRANSMISSION CONTROL SWITCH/TRANSMISSION CONTROL INDICATOR LAMP

Diagnostic Aids

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used
to diagnose the following:

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Wiring Harness Circuits (TCIL & TCS)

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Faulty Powertrain Control Module (PCM)

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