SFI System (2UZ-FE): Inspection

WARNING: This page is about a different car, the 2005 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT MASS AIR FLOW METER
1. Check the output voltage.
  1. Apply battery voltage across terminals 3 (+B) and 4 (E2G).
  2. Connect the positive (+) tester prove to terminal 5 (VG), and the negative (-) tester prove to terminal 4 (E2G).
  3. Blow air into the MAF meter, and check if the voltage fluctuates.
2. Check the resistance.
  1. Using an ohmmeter, measure the resistance between terminals 2 (THA) and 1 (E2).
  Resistance:
  - 12.5 to 16.9 kΩ at -20°C (-4°F)
  - 2.19 to 2.67 kΩ at 20°C (68°F)
  - 0.50 to 0.68 kΩ at 60°C (140°F)
Fig 1: Measuring Resistance Between Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY

Check the resistance.

Using an ohmmeter, measure the resistance between the terminals.

Standard:

CAMSHAFT TIMING OIL CONTROL VALVE

Tester Connection	Specified Condition
1 (+B) - 2 (GND)	6.9 to 7.9 kΩ at 20°C (68°F)

If the result is not as specified, replace the camshaft timing oil control valve.

Check the operation.
1. Apply battery voltage across the terminals, and check that the spool valve operates.
Fig 2: Checking Spool Valve Operates
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE: Check that the spool valve is not stuck.

HINT

The spool valve may not return if foreign objects are caught in it. This may cause subtle pressure leaks to the advance side, and a DTC may be set.

INSPECT THROTTLE W/MOTOR BODY ASSY
1. Disconnect the throttle control motor connector.
2. Using an ohmmeter, measure the motor resistance between terminals M+ and M-.
  Motor resistance: 0.3 to 100 Ω at 20°C (68°F)
Fig 3: Measuring Motor Resistance Between Terminals Of Throttle W/Motor Body Using Ohmmeter
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT KNOCK SENSOR

Check the resistance.

Using an ohmmeter, measure the resistance between the terminals.

Standard:

KNOCK SENSOR

Tester Connection	Specified Condition
1 (Ground) - 2 (Output)	120 to 280 kΩ at 20°C (68°F)

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

Fig 4: Inspecting Knock Sensor

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT ENGINE COOLANT TEMPERATURE SENSOR
1. Check the resistance.
  1. Using an ohmmeter, measure the resistance between the terminals.
  Resistance:
  - 2.32 to 2.59 kΩ at 20°C (68°F)
  - 0.310 to 0.326 kΩ at 80°C (176°F)
NOTE: If inspecting the water temperature sensor in water, prevent water from flowing into the terminals. After inspection, wipe the water off the sensor.

Fig 5: Inspecting Engine Coolant Temperature Sensor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT CIRCUIT OPENING RELAY

Check the resistance.

Using an ohmmeter, measure the resistance between the terminals.

Standard:

CIRCUIT OPENING RELAY

Tester Connection	Specified Condition
3-5	10 kΩ or higher
3-5	Below 1 Ω (Apply battery voltage to terminals 1 and 2)

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

Fig 6: Inspecting Circuit Opening Relay

INSPECT EFI RELAY

Check the resistance.

Using an ohmmeter, measure the resistance between the terminals.

Standard:

EFI RELAY

Tester Connection	Specified Condition
3-5	10 kΩ or higher
3-5	Below 1 Ω (Apply battery voltage to terminals 1 and 2)

If the result is not as specified, replace the E.F.I relay.

Fig 7: Inspecting EFI Relay