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, 2.4 R, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISCOMPUTER CONTROL SYSTEM
1988 Toyota 4Runner SR5, 2.4 R, Standard
Computer Control System
1988 Toyota 4Runner SR5, 2.4 R, StandardSECTION 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.