Frequently Used EEC-IV Abbreviations
- A/C: Air Conditioning
- ACCS: A/C Cycling Switch
- ACC: A/C Clutch Compressor
- ACT: Air Charge Temperature sensor
- ACV: Thermactor Air Control Valve
- AXOD: Automatic Transaxle Overdrive
- BOO: Brake On/Off switch
- BP: Barometric Pressure sensor
- CANP: Canister Purge solenoid
- CCO: Converter Clutch Override
- CFI: Central Fuel Injection
- CID: Cylinder Identification sensor
- DIS: Direct Ignition System
- DVOM: Digital Volt/Ohm Meter (see VOM)
- ECA: Electronic Control Assembly, processor, computer
- ECT: Engine Coolant Temperature sensor
- EDF: Electric Drive Fan relay assembly
- EEC: Electronic Engine Control
- EGO: Exhaust Gas Oxygen sensor (see HEGO)
- EGR: Exhaust Gas Recirculation system
- EGRC: EGR Control solenoid or system
- EGRV: EGR Vent solenoid or system
- EVP: EGR Position sensor
- EVR: EGR Valve Regulator
- FI: Fuel Injector or Fuel Injection
- FP: Fuel Pump
- FPM: Fuel Pump Monitor
- FWD: Front Wheel Drive
- GND or GRND: Ground
- HEDF: High Speed Electro Drive Fan relay or circuit
- HEGO: Heated EGO sensor
- HEGOG: HEGO Ground circuit
- HO: High Output
- HSC: High Swirl Combustion, engine type
- IDM: Ignition Diagnostic Module
- IGN: Ignition system or circuit
- INJ: Injector or Injection
- ISC: Idle Speed Control
- ITS: Idle Tracking Switch
- KAM: Keep Alive Memory
- KAPWR: Keep Alive Power
- KOEO: Key On Engine Off
- KOER: Key On Engine Running
- KS: Knock Sensor
- L: Liter(s)
- LOS: Limited Operation Strategy, computer function
- LUS: Lock-Up Solenoid
- MAF: Mass Air Flow sensor, meter or circuit
- MAP: Manifold Absolute Pressure sensor
- MA SEFI: Mass Air Sequential Fuel Injection system
- MCU: Microprocessor Control Unit
- MIL: Malfunction Indicator Light
- MPFI: Multi Point Fuel Injection
- NDS: Neutral Drive Switch
- NGS: Neutral Gear Switch
- NPS: Neutral Pressure Switch
- OCC: Output Circuit Check
- OHC: Overhead Camshaft, engine type
- OSC: Output State Check
- PFE: Pressure Feedback EGR sensor or circuit
- PIP: Profile Ignition Pickup
- PSPS: Power Steering Pressure Switch
- PWR GND: Power Ground circuit
- RWD: Rear Wheel Drive
- SEFI: Sequential Fuel Injection (see MA SEFI)
- SIG RTN: Signal Return circuit
- SIL: Shift Indicator Light
- SPOUT: Spark Output Signal, from ECA
- SS 3/4-4/3: Shift Solenoid circuit
- STAR: Self Test Automatic Readout, test equipment
- STI: Self Test Input circuit
- STO: Self Test Output circuit
- TAB/TAD: Thermactor Air Bypass/Thermactor Air Diverter Tandem solenoid valves operated by separate circuits.
- TFI: Thick Film Ignition system
- TGS: Top Gear Switch (cancels SIL operation in top gear)
- THS: Transmission Hydraulic Switch
- TP or TPS: Throttle Position Sensor
- TTS: Transmission Temperature Switch
- VAF: Vane Air Flow sensor or circuit
- VAT: Vane Air Temperature
- VBATT: Vehicle Battery Voltage
- VM: Vane Meter
- VOM: Analog Volt/Ohm Meter (see DVOM)
- VPWR: Vehicle Power supply voltage (regulated 10-14 volts)
- VREF: Voltage Reference (ECA supplied reference voltage, 4-6 volts) VSC: Vehicle Speed Control sensor or signal
- VSS: Vehicle Speed Sensor or signal
- WAC: WOT A/C Cut-off switch or circuit
- WOT: Wide Open Throttle
ECA SENSOR RESISTANCE & PIN VOLTAGE REFERENCE CHART - INPUTS
| Application/Inputs | Breakout Box Pin# + / - | KOEO Ohms | KOEO Volts | KOER Volts |
|---|---|---|---|---|
| Engine Coolant Temperature (ECT) | 7/46 | 1700-3600 | N/A | 0.74-0.31 |
| Throttle Position Sensor (TPS) | 47/46 | 500-1200 | 0.7-1.3 | 0.7-1.3 |
| Pressure Feedback EGR (PFE) | 27/46 | N/A | 3.0-3.5 | 3.0-3.5 |
| EGR Valve Position (EVP) | 27/46 | 480-650 | 0.30-0.45 | 0.30-0.45 |
| Heated Exhaust Gas Oxygen (HEGO) | 29/46 | 1.5 Milliohms | 0.4 (Maximum) | 0-0.9 |
| Coil Tach Signal (IDM) | 4/16 | 21,800 | 8.0-10.0 | 8.0-12.0 |
| Distributor Position (PIP) | 56/16 | 1100-2100 | N/A | 3.0-7.0 |
| Reference Voltage (VREF) | 26/46 | N/A | 5.0 | 5.0 |
| Vehicle Speed Sensor (VSS) | 3/6 | 190-240 | N/A | N/A |
| Knock Sensor (KS) | 23/46 | 4500-6500 | N/A | N/A |
ECA SENSOR RESISTANCE & PIN VOLTAGE REFERENCE CHART - OUTPUTS
| Application/Outputs | Breakout Box Pin# + / - | KOEO Ohms | KOEO Volts | KOER Volts |
|---|---|---|---|---|
| Idle Speed Control Motor (ISC) | 37/21 | 10.3 | 0.0 | 3.0-5.0 |
| Fuel Pump Relay (FP) | 37/22 | N/A | 0.0 | Battery + |
| Computed Spark Advance (DIS) | 36/16 | N/A | 9.0-12.5 | 8.5-9.5 |
| Computed Spark Advance (TFI) | 36/16 | N/A | 0.0 | 5.0-7.0 |
| EGR Valve Regulator (EVR) | 37/33 | 40-50 | 0.0 (Off) | 0.0 (Off) |