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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSTOYOTA19904RUNNER 2D UTILITY, 3.0 V, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - V6DIAGNOSTIC HINTS - EFI MODELS
1990 Toyota 4Runner 2D Utility, 3.0 V, Standard
Diagnostic Hints - EFI Models
1990 Toyota 4Runner 2D Utility, 3.0 V, StandardSECTION Diagnostic Hints - EFI Models
TROUBLE CODE DIAGNOSTIC HINTS (FUEL INJECTED VEHICLES)
| Trouble Code | Diagnostic Hints | ||
|---|---|---|---|
| 11 | Momentary Interruption Of Power Supply To ECU Could Also Indicate Loss Of ECU E1 Ground Connection | ||
| 12 | No "Ne" (RPM) Ignition Signal To ECU Within 2 Seconds After Engine Is Cranked No "G" Ignition Signal To ECU 2 Times In A Row When Engine Speed Is Between 500-4000 RPM | ||
| 13 | No "Ne" (RPM) Ignition Signal To ECU When Engine Speed Is Above 1500 RPM Signal Is Generated By Pick-Up Coils In Distributor | ||
| 14 | No "IGF" Ignition Signal To ECU From Ignitor Several Times In Succession | ||
| 21 | (1)Detects Deterioration Of Oxygen Sensor | ||
| 22 | Open Or Short In Coolant Temperature Sensor/Switch Signal | ||
| 24 | Open Or Short Circuit In Intake Air Temperature Sensor Signal | ||
| 25 | Open Circuit In O2 Sensor Signal Lean Signal Sent By O2 Sensor For Several Seconds During Air/Fuel Ratio Feedback Correction | ||
| 26 | Rich Signal Sent By O2 Sensor For Several Seconds During Air/Fuel Ratio Feedback Correction | ||
| 27 | Open Or Short In Sub-O2 Sensor Signal | ||
| 31 & 32 | Short Circuit Between Terminals Of Airflow Meter | ||
| 34 | Turbocharger Pressure Is Abnormal Code May Also Set If Airflow Meter Is Faulty | ||
| 35 | Open Circuit In High Altitude Compensator Signal | ||
| 41 | Open Or Short In Throttle Position Sensor Signal "IDL" & "PSW" Signals Are Output At Same Time For Several Seconds | ||
| 42 | No "SPD" Signal From Vehicle Speed Sensor For 8 Seconds With Engine Speed Between 2300-5500 RPM & Coolant Temperature Is Below 176°F (80°C) Except When Racing Engine | ||
| 43 | No "STA" Signal To ECU Until Engine Reaches 800 RPM With Vehicle Not Moving | ||
| 51 | Problem In One Of 3 Switches ECU Monitors, Throttle Position Sensor ("IDL" Signal) Neutral Safety Switch ("NSW" Signal On A/T) A/C Signal To ECU Occurs When TPS Is At Idle & A/C Switch Is On & Check Connector "E1" & "TE1" Is Jumpered | ||
| 52 | Open Or Short Circuit In Knock Sensor Signal | ||
| 53 | Knock Control In ECU Is Faulty | ||
| 71 | EGR Valve Normally Closed, Or Clogged Hose Open Circuit In EGR Temperature Sensor Signal EGR Gas Below Predetermined Level During EGR Control | ||
| 72 | Open Circuit In Fuel-Cut Solenoid Signal | ||
|
|||
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.