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 MANUALSTOYOTA2002HIGHLANDER 4WD L4-2.4L (2AZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSINFORMATION BUSTESTING AND INSPECTIONPINOUT VALUES AND DIAGNOSTIC PARAMETERS
2002 Toyota Highlander 4WD L4-2.4L (2AZ-FE)
Pinout Values and Diagnostic Parameters
2002 Toyota Highlander 4WD L4-2.4L (2AZ-FE)SECTION Pinout Values and Diagnostic Parameters
1. MULTIPLEX NETWORK BODY ECU
a. Check the body ECU.
1. Disconnect the body ECU connectors A and D.
2. Check the voltage and continuity of each terminal of the vehicle's side connectors.
HINT: If the value is not as specified the vehicle's side may be defective.
2. POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY (DOOR ECU)
a. Check the door ECU.
1. Disconnect the power window master switch assembly connector.
2. Check the voltage and continuity of each terminal of the vehicle's side connector.
HINT: If the value is not as specified the vehicle's side may be defective.
3. COMBINATION METER ASSEMBLY (METER ECU)
a. Check the meter ECU.
1. Disconnect the meter assembly connector B.
2. Check the voltage and continuity of each terminal of the vehicle's side connectors.
HINT: If the value is not as specified, the vehicle's side may be defective.
4. AIR CONDITIONING AMPLIFIER ASSEMBLY
a. Check the air conditioning amplifier.
1. Disconnect the air conditioning amplifier connector B.
2. Check the voltage and continuity of each terminal of the vehicle's side connectors.
HINT: If the value is not as specified, the vehicle's side may be defective.
5. THEFT WARNING COMPUTER ASSEMBLY
a. Check the theft warning ECU.
1. Disconnect the theft warning ECU connector.
2. Check the voltage and continuity of each terminal of the vehicle's side connectors.
6. ENGINE CONTROL COMPUTER
a. Inspect the ECM operation.
1. Check the voltage and continuity of each terminal of the vehicle's side connectors.
NOTE:
- Inspection should be started from the back side of the connector with the computer connector being connected.
- Before the measurement, check the power source voltage (10 - 14 V when IG ON) and body ground (5 ohm or less between each ground terminal and the engine body, when IG OFF).
7. SLIDING ROOF DRIVE GEAR
a. Check the sliding roof ECU.
1. Disconnect the sliding root ECU connector.
2. Check the voltage and continuity of each terminal of the vehicle's side connectors.
Terminals Of ECU (B12 - B9):
a. Check the body ECU.
1. Disconnect the body ECU connectors A and D.
2. Check the voltage and continuity of each terminal of the vehicle's side connectors.
HINT: If the value is not as specified the vehicle's side may be defective.
Terminals Of ECU:
2. POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY (DOOR ECU)
a. Check the door ECU.
1. Disconnect the power window master switch assembly connector.
2. Check the voltage and continuity of each terminal of the vehicle's side connector.
HINT: If the value is not as specified the vehicle's side may be defective.
Terminals Of ECU (C12 - C11):
3. COMBINATION METER ASSEMBLY (METER ECU)
a. Check the meter ECU.
1. Disconnect the meter assembly connector B.
2. Check the voltage and continuity of each terminal of the vehicle's side connectors.
HINT: If the value is not as specified, the vehicle's side may be defective.
Terminals Of ECU (A11 - A10):
4. AIR CONDITIONING AMPLIFIER ASSEMBLY
a. Check the air conditioning amplifier.
1. Disconnect the air conditioning amplifier connector B.
2. Check the voltage and continuity of each terminal of the vehicle's side connectors.
HINT: If the value is not as specified, the vehicle's side may be defective.
Terminals Of ECU:
5. THEFT WARNING COMPUTER ASSEMBLY
a. Check the theft warning ECU.
1. Disconnect the theft warning ECU connector.
2. Check the voltage and continuity of each terminal of the vehicle's side connectors.
Terminals Of ECU (E9 - E5):
6. ENGINE CONTROL COMPUTER
a. Inspect the ECM operation.
1. Check the voltage and continuity of each terminal of the vehicle's side connectors.
NOTE:
- Inspection should be started from the back side of the connector with the computer connector being connected.
- Before the measurement, check the power source voltage (10 - 14 V when IG ON) and body ground (5 ohm or less between each ground terminal and the engine body, when IG OFF).
Terminals Of ECU:
7. SLIDING ROOF DRIVE GEAR
a. Check the sliding roof ECU.
1. Disconnect the sliding root ECU connector.
2. Check the voltage and continuity of each terminal of the vehicle's side connectors.
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.