Test Ta: Park/Neutral Position Or Clutch Pedal Position Switches: Testing

WARNING: This page does not describe the selected car, but rather 25 other vehicles, including the 2002 Lincoln Town Car, 2002 Lincoln Navigator, 2002 Lincoln LS, 2002 Lincoln Continental, and 2002 Lincoln Blackwood. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: For additional testing information, see DIAGNOSTIC AIDS .

NOTE: On M/T models, clutch pedal must be applied. On Escort, 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 Escort only.

1) KOEO & Continuous Memory DTC P0704 & 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:
- CPP Or PNP Circuit Shorted To B+ Or VPWR
- Faulty CPP Or PNP Switch
- CPP SIGRTN Or PNP SIGRTN Circuit Open
- 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.

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. 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 Circuit

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

4) Check CPP Or PNP Circuit For Open In Harness

Using a DVOM, measure resistance between CPP and SIG RTN circuits at PCM harness connector. See PCM PWR GND, SIG RTN & VREF TERMINAL IDENTIFICATION table for SIG RTN circuit identification. Also, measure resistance between chassis ground and CPP circuit terminal at PCM harness connector. If both resistance measurements are more than 10 k/ohms, replace PCM. If any resistance measurement is 10 k/ohms or less, repair short circuit.

NOTE: For additional testing information, see DIAGNOSTIC AIDS .

5) DTC P0704, P1705 & P1709: Check CPP/PNP Switch Function
These DTCs indicate CPP or PNP voltage was high when it should have been low. Possible causes are:
- CPP Or PNP Circuit Shorted To B+ Or VPWR
- Faulty CPP Or PNP Switch
- CPP SIGRTN Or PNP SIGRTN Circuit Open
- Faulty Powertrain Control Module (PCM)
Turn ignition switch to OFF position. Ensure gearshift lever is in Neutral. Connect scan tool to Data Link Connector (DLC). 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, or move gearshift lever from Neutral, then into gear, and back to Neutral. If CPP/PNP PID value does not cycle ON and OFF for both switches, go to next step. If CPP/PNP PID value cycles ON and OFF for both switches, fault may be intermittent. Check PCM harness connector for loose, damaged or corroded terminals. Repair as necessary. If connector is okay, replace PCM.

6) Check CPP/PNP Switches Resistance

Turn ignition switch to OFF position. Locate CPP switch near clutch pedal and PNP switch near transmission shift linkage. Inspect both switches and brackets for damage and repair if necessary. Disconnect CPP and PNP switch connectors. Inspect connectors for loose, damaged or corroded terminals. Repair as necessary. Using a DVOM, measure resistance between CPP switch terminals with clutch pedal applied. Using a DVOM, measure resistance between PNP switch terminals with shift lever in Neutral. If both resistance measurements are less than 5 ohms, go to next step. If either resistance measurement is 5 ohms or more, replace CPP or PNP switch.

7) 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 Figure or Figure, and Figure-Figure . 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.

8) 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.