Toyota Highlander Service Manual: Inspection

Toyota Highlander Service Manual / Engine control system / SFI system (3MZ-FE) / Inspection

1. INSPECT MASS AIR FLOW METER

INSPECT MASS AIR FLOW METER

(a) Check the output voltage.

Apply battery voltage across terminals 1 (+B) and 2 (E2G).
Connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E2G.
Blow air into the Mass Air Flow (MAF) meter, and check that the voltage fluctuates.

(b) Measure the resistance between terminals 4 (THA) and 5 (E2).

Standard:

INSPECT MASS AIR FLOW METER

If the result is not as specified, replace the MAF meter.

2. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY

INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY

(a) Measure the resistance between the terminals.

Standard: 6.9 to 7.9 W at 20 C (68 F)

If the result is not as specified, replace the OCV assy.

(b) Connect the battery's positive (+) lead to terminal 1 and negative (-) lead to terminal 2, and check the movement of the valve.

NOTICE: Confirm that the valve moves freely and does not become stuck in any position.

If necessary, replace the OCV assy.

HINT: If the valve cannot return properly because of foreign matter, a small pressure leak in the advanced direction may occur and a DTC will be output.

3. INSPECT ACCELERATOR PEDAL ROD ASSY

(a) Check the acceletor pedal position sensor (see page 05-469 ).

4. INSPECT THROTTLE BODY ASSY

INSPECT THROTTLE BODY ASSY

(a) Check the throttle position sensor (see page 05-469 ).

(b) Check the throttle control motor.

Measure the resistance between terminals 2 (M+) and 1 (M-).
Resistance: 0.3 to 100 W at 20 C (68 F).

If the result is not as specified, replace the throttle body assy.

5. INSPECT ENGINE COOLANT TEMPERATURE SENSOR

INSPECT ENGINE COOLANT TEMPERATURE SENSOR

(a) Measure the resistance between each terminal.

Standard:

INSPECT ENGINE COOLANT TEMPERATURE SENSOR

If the result is not as specified, replace the sensor.

NOTICE: If checking the ECT sensor in the water, keep the terminals dry. After the check, wipe the sensor dry.

6. INSPECT KNOCK SENSOR

INSPECT KNOCK SENSOR

(a) Measure the resistance between the terminals.

Resistance: 120 to 280 kW at 20 C (68 F)

If the result is not as specified, replace the sensor.

7. INSPECT RELAY (Marking: EFI, A/F)

INSPECT RELAY

(a) Remove the EFI relay from the engine room J/B.

(b) Remove the A/F relay from the engine room R/B No. 2.

Standard:

INSPECT RELAY

If the result is not as specified, replace the relay.

8. INSPECT CIRCUIT OPENING RELAY

INSPECT CIRCUIT OPENING RELAY

(a) Remove the circuit opening relay from the R/B sub-assy.

(b) Measure the resistance of the relay.

Standard:

INSPECT CIRCUIT OPENING RELAY

If the result is not as specified, replace the relay.

On-vehicle inspection

1. CHECK THROTTLE BODY (a) Listen to the throttle control motor operating sounds. Turn the ignition switch ON. When pressing the accelerator pedal position sensor lever, listen t ...

Throttle body ASSY (3MZ-FE)

COMPONENTS REPLACEMENT 1. DRAIN ENGINE COOLANT (See page 16-26 ) 2. REMOVE FRONT SUSPENSION BRACE SUB-ASSY UPPER CENTER (a) Remove the 2 nuts and upper brace. 3. REMOVE V-BANK COVER SUB-A ...

More about Toyota Highlander:

Cleaning and protecting the vehicle interior
The following procedures will help protect your vehicle’s interior and keep it in top condition: Protecting the vehicle interior Remove dirt and dust using a vacuum cleaner. Wipe dirty surfaces with a cloth dampened with lukewarm water. Cleaning the leather areas Remove dirt and dust usin ...