Ignition System: Notes

WARNING: This page is about a different car, the 1994 Mercury Topaz and 1994 Ford Tempo. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: For additional information and descriptions, see IGNITION SYSTEM in THEORY/OPERATION - EEC-IV 2.3L article in the ENGINE PERFORMANCE section.

IGNITION SYSTEM ACRONYMS

Acronym ⁽¹⁾

Definition

B + Or B (+)

Battery Positive

B- Or B (-)

Battery Negative

C1, C2, C3

Coil Drive (Coils 1, 2 & 3)

Distributor Ignition System

EI ⁽²⁾

Electronic Ignition (High Data Rate Or Low Data Rate)

FTO

Filtered Tach Output

ICM

Ignition Control Module

IDM

Ignition Diagnostic Monitor (Diagnostic Signal To PCM)

IGND

Ignition Ground (Low Current Ground Reference)

KOEC

Key On Engine Cranking (Testing Condition)

KOEO

Key On Engine Off (Testing Condition)

KOER

Key On Engine Running (Testing Condition)

PCM

Powertrain Control Module (EEC-Processor, Computer, Processor)

PIP

Profile Ignition Pick-Up (Camshaft Position Sensor Signal)

PWR GND

Power Ground Circuit To ICM

SPOUT

Spark Output (PCM Spark Control Signal)

VPWR Or VBAT

Battery Power Or Battery Voltage

⁽¹⁾	Not all circuits and components are used in all systems.

⁽²⁾	EI is a distributorless ignition system.

IGNITION SYSTEM IDENTIFICATION

Application	System
2.3L HSC	DI