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, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 11 (TESTS W/CODES)TROUBLE CODE CHARTS
1990 Toyota 4Runner 2D Utility, 3.0 V, Standard
Trouble Code Charts
1990 Toyota 4Runner 2D Utility, 3.0 V, StandardSECTION Trouble Code Charts
WARNING: This page is about a different car, the 1989 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
TROUBLE CODE DIAGNOSTIC HINTS (CARBURETED VEHICLES)
| Trouble Code | Diagnostic Hints | ||
|---|---|---|---|
| 12 | No RPM (Ignition) Signal to ECU within several seconds after engine is cranked. | ||
| 21 | Detects deterioration of oxygen sensor. | ||
| 22 | Open or short in coolant temperature sensor/switch signal. | ||
| 25 | Open circuit in O2 sensor signal (1) EBCV and/or EACV always open. Short in EBCV signal. | ||
| 26 | EBCV always closed or clogged hose. Open circuit in EBCV signal. | ||
| 31 | Open or short in vacuum switches signal. | ||
| 41 | Open or short in throttle switch signal. | ||
| 42 | Open or short in vehicle speed sensor. | ||
| 71 | EGR valve normally closed, or clogged hose. Open circuit in EGR temperature sensor signal | ||
| 72 | Open circuit in fuel-cut solenoid signal | ||
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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.