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.
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HOMESERVICE MANUALSFORD1988ESCORT GL, 4D HATCHBACK, STANDARD, MTXIIIREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEM1.9L EEC IV TESTING
1988 Ford Escort GL, 4D Hatchback, Standard, MTXIII
1.9L EEC IV Testing
1988 Ford Escort GL, 4D Hatchback, Standard, MTXIIISECTION 1.9L EEC IV Testing
- Diagnosis & Testing
- Quick Test
- Notes
- Preparation For Testing
- Equipment Hook-Up
- Test Equipment
- Test Connector Locations
- Reading Self-Test Codes
- Key On/Engine Off (KOEO) Self-Test
- Computed Timing Check
- Key On Engine Running (KOER) Self-Test
- Continuous Monitor Self-Test (Wiggle Test)
- Quick Test Diagnostic Aids
- Service Code Description: 1988 Ford EEC-IV
- Symptom/Test Menu
- KOEO Code/Test Menu
- KOER Code/Test Menu
- Continuous Code/Test Menu
- DRIVEABILITY Tests
- Intermittent No Start, Quits On Road With No Restart
- Intermittent Surging At Steady Speed
- Intermittent Stalls While Driving & On Restarts
- Intermittent Bucking & Jerking
- Intermittent Erratic Running Or Rough Idle
- How To Use Circuit Tests
- Test A1 - No Start
- Test A2 - Vehicle Battery
- Test A3 - Reference Voltage
- Test B1 - Vat Sensor
- Test B2 - Act Sensor
- Test B3 - MAF Sensor
- Test B5 - ECT Sensor
- Test B6 - Map/BP Sensor
- Test B8 - TPS Sensor
- Test B9 - Vane Airflow (VAF) Sensor
- Test B10 - PFE/EVR
- Test B13 - NDS A/C/ Input
- Test B15 - PSPS
- Test C1 - Fuel Control
- Test C2 - Inertia Switch
- Test D1 - EGR On/Off Control
- Test D2 - Idle Speed Control
- Test D3 - Air Management System
- Test D4 - Canister Purge (CANP) Check
- Test D5 - Idle Speed Control
- Test D6 - SIL
- Test D7 - Wot/WAC & A/C
- Test D8 - Turbo Boost
- Test D9 - CCO & Shift Solenoid
- Test D10 - Dynamic Response Test
- Test D11 - "Check Engine" Light/Message (Mil)
- Test D12 - IDM
- Test D13 - Spark Computed Timing Check
- Test D14 - No Codes/Codes Not Listed
- Test D15 - Code 15 KOEO Continuous
- Test D16 - No Output
- Test D17 - ECA Power Check
- Test D18 - Re-Initialization Check
- Test D19 - Key Power Check
- Test D20 - System Check
- Test D21 - AXOD Transaxle
- Test D22 - Integral Relay Control Module (IRCM)
- Test D23 - Erratic Ignition
- Test D25 - AXOD Transaxle Electrical System Diagnosis
- Wiring Diagrams
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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.