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 MANUALSTOYOTA19904RUNNER 2D UTILITY, 3.0 V, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 10 (ENGINE CONTROLS - TESTS W/CODES)
1990 Toyota 4Runner 2D Utility, 3.0 V, Automatic
Section 10 (Engine Controls - Tests W/Codes)
1990 Toyota 4Runner 2D Utility, 3.0 V, AutomaticSECTION Section 10 (Engine Controls - Tests W/Codes)
WARNING: This page is about a different car, the 1990 Toyota Celica and 1989 Toyota Celica. However, it is still accessible from the selected car via links, so may be relevant.
- Introduction
- Ecu Location
- "Hard Failures"
- "Intermittent Failures"
- Check Engine Light
- Retrieving Trouble Codes
- Notes On Trouble Codes
- Clearing Trouble Codes
- Repair Procedure
- Trouble Code Charts
- Diagnostic Circuit Check
- 1989 Ecu Terminal Identification
- 1990 Ecu Terminal Identification
- Test 1 - Ecu Power Source
- Test 2 Or Code 11 - Ecu (B+) Circuit
- Test 3 Or Code 12, 13, 14 - Ignition & Rpm Signal
- Test No.4/Code No. 21, 27 - Oxygen Sensor Signal
- Test 5 Or Code 22 - Coolant Temperature Sensor Signal
- Test 6 Or Code 24 - Intake Air Temp Sensor Signal
- Code 25 - Lean Air/Fuel Mixture
- Code 26 - Rich Air/Fuel Mixture
- Test 7 Or Code 31, 32 - Airflow Meter Signal
- Test 8 Or Code 34, 35 - Turbocharger Pressure (3S-GTE)
- Test 9 Or Code 41 - TPS Signal
- Code No. 42 - Vehicle Speed Sensor (VSS) Signal
- Test 10 Or Code 43 - Starter Signal
- Code No. 51 - Switch Signal
- Code 52 - Knock Sensor Signal
- Code 53 - Knock Sensor Control (Ecu)
- Code No. 54 - INTERCOOLER Ecu Signal
- Test 11 Or Code 71 - EGR System Malfunction
- Test 12 - Injector Circuit
- Test 13 - Idle Speed Control Circuit
- Test No. 14 - "Check Engine" Light Circuit
- Test No. 15 - A/C Switch Circuit
- Summary
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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.