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 MANUALSFORD1991CAB & CHASSIS 5.8 H, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 5.8L
1991 Ford Cab & Chassis 5.8 H, Automatic
Engine Controls - Tests W/Codes - 5.8L
1991 Ford Cab & Chassis 5.8 H, AutomaticSECTION Engine Controls - Tests W/Codes - 5.8L
- Introduction
- Self-Diagnostic System
- Retrieving Codes
- Clearing Codes
- Reading Codes
- Quick Test
- Additional System Functions
- Summary
- Code-To-Test Menus - 5.8L (2-Digit Codes)
- Code-To-Test Menus - 5.8L (3-Digit Codes)
- How To Use Circuit Tests
- Test A
- Test B
- Test C
- Test DA
- Test DF - Map/BP Sensor
- Test DH
- Test DN - EVP Sensor & EVR Solenoid
- Test DP
- Test FD
- Test G
- Test H
- Test Ha
- Test J
- Test Kc
- Test KD
- Test KE
- Test Km - WAC & A/C Demand Switches
- Test M
- Test Ml - STO Or Mil Lights
- Test NA
- Test Pa
- Test QA
- Test QB
- Test QC
- Test S
- Test Ta
- Test Tb
- Test TC - E4OD Automatic Transmission
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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.