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 MANUALSTOYOTA19994RUNNER LIMITED, 3.4 N, RWDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM SELF-DIAGNOSTICS - V6
1999 Toyota 4Runner Limited, 3.4 N, RWD
Engine Control System Self-Diagnostics - V6
1999 Toyota 4Runner Limited, 3.4 N, RWDSECTION Engine Control System Self-Diagnostics - V6
- Diagnostic Trouble Code Definitions
- Diagnostic Tests
- Notes
- DTC P0100: Mass Airflow (MAF) Meter Circuit
- DTC P0101: Mass Airflow (MAF) Meter Circuit Range/Performance
- DTC P0110: Intake Air Temperature (IAT) Sensor Circuit
- DTC P0115: Engine Coolant Temperature (ECT) Sensor Circuit
- DTC P0116: Engine Coolant Temperature (ECT) Sensor Circuit Range/Performance
- DTC P0120: Throttle Position (TP) Sensor Circuit
- DTC P0121: Throttle Position (TP) Sensor Circuit Range/Performance
- DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control (Except CALIF. Emissions)
- DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control (CALIF. Emissions)
- DTC P0130: Heated Oxygen Sensor No. 1 Circuit (Except CALIF. Emissions)
- DTC P0133: Heated Oxygen Sensor No. 1 Circuit Slow Response (Except CALIF. Emissions)
- DTC P0135: Heated Oxygen Sensor No. 1 Heater Circuit (Except CALIF. Emissions)
- DTC P0136: Heated Oxygen Sensor No. 2 Circuit
- DTC P0141: Heated Oxygen Sensor No. 2 Heater Circuit
- DTC P0171 Or P0172: System Too Lean/Rich (Except CALIF. Emissions)
- DTC P0171 Or P0172: System Too Lean/Rich (CALIF. Emissions)
- DTC P0300: Random Misfire Detected
- DTCS P0301-P0306: Cylinders No. 1-6 Misfire Detected
- DTC P0325 Or P0330: Knock Sensor No. 1 Or 2 Circuit
- DTC P0335 Or P1335: Crankshaft Position (CKP) Sensor Circuit
- DTC P0340: Camshaft Position (CMP) Sensor Circuit
- DTC P0420: Catalyst System Efficiency Below Threshold (Except CALIF. Emissions)
- DTC P0420: Catalyst System Efficiency Below Threshold (CALIF. Emissions)
- DTC P0440: Evaporative Emission Control System
- DTC P0441: Incorrect EVAP Purge Flow, Or DTC P0446: EVAP Vent Control Circuit
- DTC P0450: EVAP Pressure Sensor Circuit, Or DTC P0451: EVAP Pressure Sensor Range/Performance
- DTC P0500: Vehicle Speed Sensor Circuit
- DTC P0505: Idle Air Control (IAC) System Circuit
- DTC P1130: Air/Fuel Sensor Circuit Range/Performance (CALIF. Emissions)
- DTC P1133: Air/Fuel Sensor Circuit Response (CALIF. Emissions)
- DTC P1135: Air/Fuel Sensor Heater Circuit (CALIF. Emissions)
- DTC P1300: IGNITOR Circuit
- DTC P1335: Crankshaft Position (CKP) Sensor Circuit
- DTC P1520: Stoplight Switch Signal Circuit (A/T Only)
- DTC P1600: ECM Batt Circuit
- DTC P1780: Park/Neutral Position (PNP) Switch Circuit
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.