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 DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - V6TROUBLE CODE CHARTS - EFI MODELS
1990 Toyota 4Runner 2D Utility, 3.0 V, Automatic
Trouble Code Charts - EFI Models
1990 Toyota 4Runner 2D Utility, 3.0 V, AutomaticSECTION Trouble Code Charts - EFI Models
PICKUP, 4RUNNER TROUBLE CODE IDENTIFICATION
| Code No. | System Affected | Probable Cause | ||||||
|---|---|---|---|---|---|---|---|---|
| No Code | System Normal | System Normal | ||||||
| 11 (1) | ECU (B+) | Ignition Switch, Main Relay Or Circuit, ECU | ||||||
| 12 | RPM Signal | Distributor Or Circuit, Starter | ||||||
| 13 | RPM Signal | Distributor, Ignitor Or Circuit, ECU | ||||||
| 14 | Ignition Signal | Ignition Coil, Ignitor Or Circuit, ECU | ||||||
| 21 | O2 Sensor Or O2 Heater Signal | O2 Sensor, O2 Heater Signal Or Circuit, ECU | ||||||
| 22 | Coolant Temperature. Sensor Signal | Coolant Temperature Sensor Or Circuit, ECU | ||||||
| 24 | Intake Air Temperature Sensor Signal | Intake Air Temperature Sensor Or Circuit, ECU | ||||||
| 25 | Lean Air/Fuel Mixture | Injector Or Circuit, O2 Sensor, O2 Sensor Circuit, Fuel Line Pressure, Airflow Meter, ECU, Air Intake System, Ignition System | ||||||
| 26 | Rich Air/Fuel Mixture | Injector Or Circuit, Fuel Pressure, Cold Start Injector, Airflow Meter, O2 Sensor Or Circuit, ECU | ||||||
| 31 | Airflow Meter Signal | Airflow Meter Or Circuit, ECU | ||||||
| 32 (1) | Airflow Meter Signal | Airflow Meter Or Circuit, ECU | ||||||
| 35 (2) | HAC Sensor Signal | HAC Sensor Or Circuit, ECU | ||||||
| 41 | TPS Signal | TPS Or Circuit, ECU | ||||||
| 42 | Vehicle Speed Sensor Signal | Speed Sensor Or Circuit, ECU | ||||||
| 43 | Starter Signal | Ignition Switch Or Circuit, Starter Signal Circuit, ECU | ||||||
| 51 | Switch Signal | Accelerator Pedal Or Cable, A/C Switch Circuit, A/C Amplifier, ECU, Neutral/Start Switch Or Circuit, TPS Sensor Or Circuit | ||||||
| 52 | Knock Sensor Signal | Knock Sensor Or Circuit, ECU | ||||||
| 53 | Knock Sensor Control (ECU) | ECU | ||||||
| 71 (3) | EGR System Malfunction | EGR System, EGR Temp. Sensor, Sensor Circuit, EGR BVSV Or VSV, BVSV Or VSV Circuit, ECU | ||||||
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RENDER: 1.0x
NO RELATED
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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.