Test NC: Ignition Engine Speed Input Circuit: Testing

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.

NOTE: For additional testing information, see DIAGNOSTIC AIDS .

1) For KOEO & Continuous Memory Only DTC P0320: Erratic Ignition
The ignition engine speed sensor input signal to PCM is continuously monitored. The test fails when the signal indicates that two successive erratic Profile Ignition Pickup (PIP) pulses have occurred. Possible causes are:
- Loose wires/connectors.
- Arcing secondary ignition components (coil, wires and plugs).
- On board transmitter (2-way radio).
Ensure 2-way radio antenna and all harness connections are properly installed and routed. If any faults were present, repair as necessary. If vehicle will not start, go to TEST A, step 1) . If fault is intermittent, go to TEST Z, step 1). If vehicle will start and no faults were present, check for missing PIP signal. Go to TEST JD, step 1) .