Passive Anti-Theft System (PATS) - Symptom Chart

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible Sources	Action
The anti-theft indicator is never on - no 3-second anti-theft indicator prove-out	Fuse Instrument cluster	REFER to INSTRUMENT CLUSTER .
The anti-theft system does not operate correctly - the vehicle cranks but anti-theft indicator flashes rapidly at key ON	Incorrect transaxle control module (TCM) calibration TCM Powertrain Control Module (PCM)	REFER to MODULE CONFIGURATION for TCM calibration. Test the system for normal operation. If the condition returns REFER to the INTRODUCTION -- HYBRID ESCAPE & HYBRID MARINER article.
The vehicle does not start-the anti-theft indicator does not prove out and flashes rapidly	Powertrain control module (PCM) Passive anti-theft system (PATS) transceiver PATS key	GO to PINPOINT TEST I .
The vehicle does not start-the anti-theft indicator proves out for 3 seconds as normal, vehicle does not crank	Starter circuit Transaxle control module (TCM)	CARRY OUT the TCM diagnostics. REFER to STARTING SYSTEM .
The vehicle does not start-the anti-theft indicator proves out for 3 seconds as normal but the engine does not remain running	Powertrain concern	CARRY OUT powertrain diagnostics. REFER to the INTRODUCTION -- HYBRID ESCAPE & HYBRID MARINER article.
The vehicle starts and runs for longer than 1 second, then stalls	This is not a passive anti-theft system (PATS) issue. PATS never disables a running engine.	CARRY OUT powertrain diagnostics. REFER to the INTRODUCTION -- HYBRID ESCAPE & HYBRID MARINER article.