Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1989 Ford Taurus SHOFACTORY OEM SERVICE PROCEDURE
3.0L CEC Tests W/Codes
- Diagnosis & Testing
- Quick Test
- Description
- Visual Check & Vehicle Preparation
- Test Connector Location
- Test Equipment Hook-Up
- Key On Engine Off (KOEO) Self-Test
- Computed Timing Check
- Key On Engine Running (KOER) Self-Test
- Continuous Self Test
- Continuous Monitor Mode (Wiggle Test)
- Diagnosis By Symptom
- Diagnostic Aids
- ECA Pin Voltage & Resistance Checks
- Frequently Used EEC-IV Abbreviations
- Resistance/Volt Charts
- KOEO Code/Test Menu
- KOER Code/Test Menu
- Continuous Code/Test Menu
- Symptom/Test Menu
- How To Use Circuit Tests
- Circuit Tests
- Circuit Test A1 - No Start
- Circuit Test A2 - Vehicle Battery
- Circuit Test A3 - Reference Voltage
- Circuit Test B1 - Vane Air Temperature (Vat) Sensor
- Circuit Test B2 - Air Charge Temperature (Act) Sensor
- Circuit Test B3 - Mass Airflow Sensor (MAF)
- Circuit Test B4 - EGR Valve Position (EVP) Sensor EGR Control (EGRC) Solenoid & EGR Vent (EGRV) Solenoid
- Circuit Test B5 - Engine Coolant Temperature (ECT) Sensor
- Circuit Test B6 - Manifold Absolute Pressure (Map)/Barometric Pressure (BP) Sensor
- Circuit Test B7 - Knock Sensor (KS)
- Circuit Test B8 - Throttle Position Sensor (TPS)
- Circuit Test B9 - Vane Airflow (VAF) Sensor
- Circuit Test B10 - Pressure Feedback EGR (PFE) Valve & EGR Vacuum Regulator (EVR) Solenoid
- Circuit Test B11 - EGR Valve Position (EVP) Sensor & EGR Valve Regulator (EVR) Solenoid
- Circuit Test B12 - Vehicle Speed Sensor (VSS)
- Circuit Test B13 - Neutral Drive Switch (NDS) A/C Input
- Circuit Test B14 - Brake On/Off Switch (Boo)
- Circuit Test B15 - Power Steering Pressure Switch (PSPS)
- Circuit Test C1 - Fuel Control - All Applications
- Circuit Test C2 - Fuel Pump Circuit (Inertia Switch)
- Circuit Test D1 - EGR On/Off Control
- Circuit Test D2 - Idle Speed CTRL. (Dc Motor/Idle Tracking Switch Assembly & TPS)
- Circuit Test D3 - Air Management System (Am1/Am2)
- Circuit Test D4 - Canister Purge (CANP)
- Circuit Test D5 - Idle Speed Control (Air By-Pass)
- Circuit Test D6 - Shift Indicator Light (SIL)
- Circuit Test D7 - Wide Open Throttle A/C Cut-Out (WAC) & A/C Demand Switch
- Circuit Test D8 - Octane Adjust
- Circuit Test D9 - Supercharger By-Pass Solenoid (SBS)
- Circuit Test D10 - Dynamic Response Test
- Circuit Test D11 - Check Engine" Light/Message (Malfunction Indicator)
- Circuit Test D12 - Ignition Diagnostic Monitor (IDM)
- Circuit Test D13 - Spark Timing Check
- Circuit Test D14 - No Codes/Codes Not Listed
- Circuit Test D15 - Code 15 KOEO Continuous
- Circuit Test D16 - Output State Check Not Functioning
- Circuit Test D17 - Re-Initialization Check
- Circuit Test D18 - Key Power Check
- Circuit Test D19 - System Check
- Circuit Test D20 - Intake Air Control Valve (IAC) System
- Circuit Test D21 - AXOD Transaxle
- Circuit Test D22 - A4LD Transmission
- Circuit Test D23 - Integral Relay Control Module (IRCM)
- Circuit Test D24 - AXOD Electrical System Diagnosis
- Wiring Diagrams
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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