TA: Park/Neutral Position (PNP)/ Clutch Pedal Position (CPP) Switches

TA: Introduction

TA1 DIAGNOSTIC TROUBLE CODES (DTCS) 522, 525 or 528: SYSTEM IDENTIFICATION

DTCs 522, 525, or 528 resulted from the voltage being high at either:

• Pin 10 = A/C input
• Pin 30 = PNP/CPP input

while cranking the engine or during Key On Engine Off Diagnostic Test Mode (DTM).

Possible causes:

• A/C circuit shorted to power.
• CPP circuit open.
• PNP open.
• Damaged PCM.
• Starter relay disconnected during Self-Test.

TA2 CHECK PNP/CPP INPUT

• Key off.
• Verify A/C is off, if so equipped.
• Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.
• Install breakout box, leave PCM disconnected.
• Measure resistance between Test Pin 30 and Test Pin 46 at the breakout box:
• With transmission in NEUTRAL and the clutch pedal up.
• With transmission in GEAR and the clutch pedal down.

TA3 CHECK CPP/PNP SWITCH INTEGRITY

• Key off.
• Breakout box installed, PCM disconnected.
• Measure resistance between Test Pin 30 and Test Pin 46 at the breakout box with transmission in any gear and the clutch pedal up.

TA4 CHECK CPP CIRCUIT FOR SHORT TO GROUND

• Key off.
• Breakout box installed, PCM disconnected.
• Disconnect CPP switch.
• Measure resistance between Test Pin 30 and Test Pin 46 at the breakout box.

TA5 CHECK PNP/CPP SWITCH

• Key off.
• Breakout box installed, PCM disconnected.
• Locate PNP switch (on transmission) and CPP switch (at clutch pedal linkage).
• Disconnect vehicle harness at both switches and inspect connectors for pushed back pins.
• Measure resistance across the PNP switch terminals with transmission in neutral and across the CPP switch terminals with the clutch pedal down.

TA6 CHECK PNP/CPP HARNESS

• Key off.
• DVOM on 200 ohm scale.
• Breakout box installed, PCM disconnected.
• Vehicle harness disconnected at both switches.
• Measure resistance between Test Pin 30 and PNP switch harness connector and between Test Pin 30 and the CPP switch harness connector.
• Measure resistance between Test Pin 46 and the PNP switch harness connector and between Test Pin 46 and the CPP switch harness connector.

TA7 CHECK CPP SWITCH

Note: For 4.9L engines, the clutch pedal must be down during KOEO test.

• Key off.
• A/C off.
• Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.
• Install breakout box, leave PCM disconnected.
• Clutch pedal down.
• For 3.0L SHO:
• Measure resistance between Test Pin 30 and Test Pin 46 at the breakout box.
• For 4.9L:
• Measure resistance between Test Pin 30 at the breakout box and starter relay.

TA8 CHECK PNP INPUT

• Key off.
• Verify A/C is OFF, if equipped.
• Verify transmission is in NEUTRAL or PARK.
• Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.
• Install breakout box and connect PCM to the breakout box.
• Key on, engine off.
• Measure voltage between Test Pin 30 at the breakout box and chassis ground.

TA9 CHECK PNP SWITCH

• Key off.
• Breakout box installed, PCM disconnected.
• Locate the PNP switch.
• Disconnect vehicle harness from the PNP switch and measure resistance across the switch.

TA10 CHECK PNP INPUT

Note: For Escort/Tracer with EEC-IV Integrated 4EAT, go to TA15. Stand-Alone application can be identified by looking for the 4EAT module under the driver's side dash between steering column and the kick panel. The 4EAT module will not be present on integrated 4EAT application.

• Key off.
• Verify transmission is in PARK or NEUTRAL.
• Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.
• Install breakout box and connect PCM to breakout box.
• Disconnect 16 pin connector from the 4EAT module.
• Key on, engine off.
• Measure voltage between Test Pin 30 at the breakout box and chassis ground.

TA11 CHECK PNP CIRCUIT CONTINUITY BETWEEN PROCESSOR AND 4EAT MODULE

• Key off.
• 4EAT module 16 pin connector disconnected.
• Breakout box installed.
• Disconnect PCM.
• Measure resistance between Test Pin 30 at the breakout box and the PNP pin at the 4EAT module vehicle harness connector.

TA12 CHECK PNP CIRCUIT FOR SHORT TO GROUND OR CLOSED SWITCH

• Key off.
• Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.
• Install breakout box, leave PCM disconnected.
• Place transmission in DRIVE.
• DVOM on 200,000 ohm scale.
• Measure resistance between Test Pin 30 and Test Pin 40/60 at the breakout box.

TA15 DIAGNOSTIC TROUBLE CODE (DTC) 522:
DOES ENGINE START?

 

Key On Engine Off DTC 522 indicates that during Self-Test, high voltage was sensed at Pin 30 (PNP).

Possible causes:

Engine starts:

• Transmission not in PARK during Self-Test.
• Open PNP circuit between PCM and connection to START circuit.
• PNP/START circuit short to power.
• Damaged PCM.

No start:

• Damaged starter relay.
• Open START circuit between PNP switch and PNP connection to circuit, PNP switch and starter relay or starter relay and ground.

Note: Verify that transmission was in PARK during Self-Test. If transmission was not in PARK, rerun Self-Test and proceed as directed.

TA16 CHECK PNP/START CIRCUIT FOR SHORT TO POWER

• Key off.
• Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.
• Install breakout box, leave PCM disconnected.
• Key on.
• Measure voltage between Test Pin 30 and Test Pin 40 (GND) at the breakout box.

TA17 CHECK PNP CIRCUIT CONTINUITY

• Key off.
• Breakout box installed, PCM disconnected.
• Disconnect PNP switch (3 pin at transmission).
• Measure resistance between Test Pin 30 at the breakout box and PNP/IGN START circuit at PNP switch vehicle harness connector.