Profile Ignition Pick-Up (PIP)

On 2.3L EI ignition systems, modulated PIP and CID signals are produced by dual Hall Effect crankshaft sensor and monitored by ignition module. See CRANKSHAFT POSITION (CKP) SENSOR under INPUT DEVICES. Ignition module relays the PIP signal to PCM, which uses it as an RPM reference to determine timing adjustments.

PCM timing control returns to ignition module in form of a Spark Output (SPOUT) signal. The leading edge of SPOUT signal fires coil, and trailing edge controls dwell on-time.

On 4.0L Explorer and Ranger ignition systems, PIP signal is generated by Variable Reluctance Sensor (VRS), located near crankshaft pulley. The VRS is a Permanent Magnet (PM) generator, which produces an AC voltage signal which increases with RPM. The ignition module monitors this signal, passes this information on to PCM and modifies coil triggering signal based on a Spark Angle Word (SAW) signal sent from PCM.

On Distributor Ignition (DI) systems, PIP signal is provided by a 12-volt reference from ignition module to Hall Effect switch inside distributor. This reference voltage is modulated by window/shutter Hall Effect switch. Monitored reference is pulled low when shutter blade is out of Hall Effect switch window.

When shutter blade enters window, 12-volt reference returns, and ignition module sends PIP signal to PCM. PCM uses the PIP signal as an RPM reference to calculate timing adjustments. PCM timing control returns to ignition module in form of a Spark Output (SPOUT) signal.