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 MANUALSTOYOTA2002HIGHLANDER 4WD L4-2.4L (2AZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSON-VEHICLE INSPECTION
2002 Toyota Highlander 4WD L4-2.4L (2AZ-FE)
On-Vehicle Inspection
2002 Toyota Highlander 4WD L4-2.4L (2AZ-FE)SECTION On-Vehicle Inspection
ON-VEHICLE INSPECTION
1. INSPECTION POWER STEERING OIL PRESSURE SENSOR
a. Voltage inspection
1. Using an ohmmeter, measure the voltage between the terminal PSW and terminal E1.
Voltage:
Not spin the steering wheel at engine idling 9 - 14 V
Spin the steering wheel at engine idling 0 - 3 V
2. THROTTLE BODY IDLE SPEED CONTROL VALVE ASSY
NOTE:
- It is impossible to check the resister value and the operation of ISCV by itself, because the ISCV has an IC circuit inside it, which transforms the duty signal from the ECU to the derive signal.
- After checking, erase the DTC.
- Clear the DTC after inspection.
HINT: When the ISCV system has malfunctions except for its adherence, DTC is detected.
a. Remove the ISC.
b. Operation inspection.
1. Connect the ISC connector to the ISC valve.
2. Check the ISC valve movement when the ignition switch is turned ON.
Movement:
Half open -> fully close -> fully open -> half open
HINT: ISC valve moves within 0.5 second.
1. INSPECTION POWER STEERING OIL PRESSURE SENSOR
a. Voltage inspection
1. Using an ohmmeter, measure the voltage between the terminal PSW and terminal E1.
Voltage:
Not spin the steering wheel at engine idling 9 - 14 V
Spin the steering wheel at engine idling 0 - 3 V
2. THROTTLE BODY IDLE SPEED CONTROL VALVE ASSY
NOTE:
- It is impossible to check the resister value and the operation of ISCV by itself, because the ISCV has an IC circuit inside it, which transforms the duty signal from the ECU to the derive signal.
- After checking, erase the DTC.
- Clear the DTC after inspection.
HINT: When the ISCV system has malfunctions except for its adherence, DTC is detected.
a. Remove the ISC.
b. Operation inspection.
1. Connect the ISC connector to the ISC valve.
2. Check the ISC valve movement when the ignition switch is turned ON.
Movement:
Half open -> fully close -> fully open -> half open
HINT: ISC valve moves within 0.5 second.
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.