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 MANUALSTOYOTA19884RUNNER SR5, 3.0 V, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMCOMPUTER CONTROL SYSTEM
1988 Toyota 4Runner SR5, 3.0 V, Automatic
Computer Control System
1988 Toyota 4Runner SR5, 3.0 V, AutomaticSECTION Computer Control System
- Description
- Operation
- Characteristics
- Electronic Fuel Injection (EFI)
- Data Sensors
- Notes
- A/C Switch
- Airflow Sensor
- Air Temperature Sensor
- Cold Start Injector Time Switch
- Coolant Temperature Sensor
- Coolant Temperature Switch
- EGR Gas Temperature Sensor
- Engine Speed
- Knock Sensor
- Neutral/Start Switch
- Oxygen (O2) Sensor
- Sub-Oxygen Sensor (Calif. Only)
- Throttle Position Sensor (TPS)
- Turbo Pressure Sensor
- Vehicle Speed Sensor (VSS)
- 4WD Switch
- Electronic Control Unit (Ecu)
- Diagnostic System
- Component Locations
- Diagnosis & Testing
- Ecu Connector Identification
- Diagnostic Charts
- Diagnostic Circuit Check
- Ecu Pin Voltage Tests
- No. 1 Test, Code 11, Ecu (+B) Circuit
- No. 2 Test, Code 12, 13, 14 (Code 3, 6 On Turbo), Rpm & Ignition Signal
- No. 3 Test, Code 21, 25, 26, 28 (Code 5 On Turbo), O2 System Signal
- No. 4 Test, Code 22 (Code 4 On Turbo), Coolant Temperature Sensor Signal
- No. 5 Test, Code 24 (Code 8 On Turbo), Intake Air Temperature Sensor Signal
- Code 25, 26, Air/Fuel, Lean Or Rich
- No. 6 Test, Code 31, 32 (Code 2 On Turbo), Airflow Meter Signal
- No. 7 Test, Code 35, HLAC Sensor Signal (Non-Turbo)
- No. 8 Test, Code 41 (Code 7 On Turbo), TPS Sensor Signal
- Code 42 Vehicle Speed Sensor
- No. 9 Test, Code 43 (Code 10 On Turbo), Starter Signal
- Code 51 (Code 11 On Turbo)
- Code 52, 53 (Code 12, 13 On Turbo)
- No. 10 Test, Code 71, EGR System Signal
- No. 11 Test, "Check Engine" Light Test
- No. 12 Test, Ecu Power Source
- No. 13 Test, Stop Light Circuit Test
- No. 14 Test Cold Start Injector Circuit Test
- No. 15 Test, Injector Circuit Test
- Component Testing
- Airflow Meter
- Throttle Position Sensor (TPS)
- Cold Start Injector Time Switch
- Coolant Temperature Sensor
- EGR Temperature Sensor
- Oxygen (O2) Sensor Heater
- Knock Sensor
- Oxygen Sensor
- Turbocharging Pressure Sensor
- Turbocharging Pressure Vacuum Switching Valve (VSV)
- Vehicle Speed Sensor
- Injector Solenoid Resistor
- Fuel-Cut Rpm
- Neutral/Start Switch
- Wiring Diagrams
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.