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 MANUALSTOYOTA2001HIGHLANDER 2WD L4-2.4L (2AZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSINFORMATION BUSTESTING AND INSPECTIONPINOUT VALUES AND DIAGNOSTIC PARAMETERS
2001 Toyota Highlander 2WD L4-2.4L (2AZ-FE)
Pinout Values and Diagnostic Parameters
2001 Toyota Highlander 2WD L4-2.4L (2AZ-FE)SECTION Pinout Values and Diagnostic Parameters
1. MULTIPLEX NETWORK BODY ECU
a. CHECK 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 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 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 detective.
4. AIR CONDITIONING AMPLIFIER ASSEMBLY
a. INSPECT 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 detective.
5. THEFT WARNING COMPUTER ASSEMBLY
a. INSPECT 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 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 around (5 ohms or less between each around terminal and the engine. body when IG OFF).
7. SLIDING ROOF DRIVE GEAR
a. CHECK SLIDING ROOF ECU
1. Disconnect the sliding roof ECU connector.
2. Check the voltage and continuity of each terminal of the vehicle's side connector.
a. CHECK BODY ECU
1. Disconnect the body ECU connectors A and D.
ECU - Connector View:
ECU - Pinouts (Standard):
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)
ECU - Connector View:
a. CHECK DOOR ECU
1. Disconnect the power window master switch assembly connector.
ECU - Pinouts (Standard):
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 METER ECU
1. Disconnect the meter assembly connector B.
ECU - Connector View:
ECU - Pinouts (Standard):
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 detective.
4. AIR CONDITIONING AMPLIFIER ASSEMBLY
a. INSPECT AIR CONDITIONING AMPLIFIER
1. Disconnect the air conditioning amplifier connector B.
ECU - Connector View:
ECU - Pinouts (Standard):
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 detective.
5. THEFT WARNING COMPUTER ASSEMBLY
a. INSPECT THEFT WARNING ECU
1. Disconnect the theft warning ECU connector.
ECU - Connector View:
ECU - Pinouts (Standard):
2. Check the voltage and continuity of each terminal of the vehicle's side connectors.
6. ENGINE CONTROL COMPUTER
a. INSPECT ECM OPERATION
1. Check the voltage and continuity of each terminal of the vehicle's side connectors.
ECU - Connector View:
ECU - Pinouts (Standard):
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 around (5 ohms or less between each around terminal and the engine. body when IG OFF).
7. SLIDING ROOF DRIVE GEAR
ECU - Connector View:
a. CHECK SLIDING ROOF ECU
1. Disconnect the sliding roof ECU connector.
ECU - Pinouts (Standard):
2. Check the voltage and continuity of each terminal of the vehicle's side connector.
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.