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.
1993 Isuzu Stylus AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes
- Introduction
- Self-Diagnostic System
- Code Charts
- ECM Location
- Trouble Code Identification
- Diagnostic Circuit Check
- Chart A-1 - No Check Engine Light
- Chart A-2 - No ALDL Data Or Will Not Flash Code 12 (Check Engine Light On Steady)
- Code 13 (SOHC) - O2 Sensor (Non-Heated Sensor) Open/Shorted Circuit
- Code 13 (DOHC) - O2 Sensor (Heated Sensor) Open/Shorted Circuit
- Code 14A - Cts Circuit (High Temperature Indicated)
- Code 14B - Cts Circuit (Low Temperature Indicated)
- Code 21A - TPS Circuit (Signal Voltage High)
- Code 21B - TPS Circuit (Signal Voltage Low)
- Code 23A - Manifold Air Temperature (Mat) Sensor Circuit (Low Temperature Indicated)
- Code 23B - Manifold Air Temperature (Mat) Sensor Circuit (High Temperature Indicated)
- Code 24 - VSS Circuit
- Code 32 - Exhaust Gas RECIRCULATION (EGR) Circuit
- Code 33A - Map Sensor (Signal Voltage High - Low Vacuum)
- Code 33B - Map Sensor (Signal Voltage Low - High Vacuum)
- Code 42 - Est (Electronic Spark Timing)
- Code 44 (SOHC) - O2 Sensor Lean Fuel Mixture (Non-Heated Sensor)
- Code 44 (DOHC) - O2 Sensor Lean Fuel Mixture (Heated Sensor)
- Code 45 (SOHC) - O2 Sensor Rich Fuel Mixture (Non-Heated Sensor)
- Code 45 (DOHC) - O2 Sensor Rich Fuel Mixture (Heated Sensor)
- Code 51 - ECM Failure Or EEPROM Failure
- Summary
Factory Service Tools
Use the Manual With the Right Hardware
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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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