Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2003 Mercury Sable, 2003 Mercury Mountaineer, 2003 Mercury Marauder, 2003 Mercury Grand Marquis, and 2003 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
Perform this test only when directed by QUICK TEST. This test is intended to diagnose the following.
- Knock Sensor (KS)
- Wiring Harness Circuits; (KS & SIG RTN)
- Powertrain Control Module (PCM)
To prevent replacement of good components, be aware the following non-EEC related areas may be at fault:
- Poor Fuel Quality
- Ignition System
- Ignition Or Valve Timing
- Engine Mechanical Condition