Ignition Systems
NOTE:
For additional information and descriptions, see IGNITION SYSTEMS in THEORY/OPERATION
article in the ENGINE PERFORMANCE section. Perform spark output check in BASIC TESTING
article in the ENGINE PERFORMANCE section before these tests. Some ignition systems require that QUICK TEST be performed before testing. This will retrieve trouble codes from EEC-IV system. See TESTS W/CODES - EEC-IV
article in the ENGINE PERFORMANCE section.
IGNITION SYSTEM ACRONYMS (1)
| Acronym | Definition | ||
|---|---|---|---|
| BAT+ Or BAT (+) | Battery Positive | ||
| BAT- Or BAT (-) | Battery Negative | ||
| BOB | Breakout Box | ||
| CCD | Computer Controlled Dwell | ||
| CID | Cylinder Identification | ||
| C1, C2, C3 | Coil Drive (Coils 1, 2 & 3) | ||
| DI | Distributor Ignition System | ||
| EI | Electronic Ignition System (Distributorless) | ||
| DPI | Dual Plug Inhibit (High Signal, Right Plugs Fire; Low Signal, Both Sides Fire) | ||
| ICM | Ignition Control Module | ||
| IDM | Ignition Diagnostic Monitor (Diagnostic Signal To PCM) | ||
| IGGND | 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 | ||
| PIP | Profile Ignition Pickup (Crankshaft Sensor Signal) | ||
| PWR GND | Power Ground Circuit | ||
| SPOUT | Spark Output (PCM Spark Control Signal) | ||
| VPWR Or VBAT | Battery Power Or Battery Voltage | ||
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IGNITION SYSTEM IDENTIFICATION
| Application | System |
|---|---|
| 4.0L | EI High Data Rate |