April 5, 2026: LEMON Manuals is launched! Read the announcement.

SFI System: Inspection

INSPECT MASS AIR FLOW METER

Output voltage inspection.
1. Apply battery voltage across terminals 1 (+B) and 2 (E2G).
2. Connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E2G.
3. Blow air into the mass air flow meter, and check that the voltage output fluctuates.

Inspect the resistance.

Using an ohmmeter, measure the resistance between terminals 4 (THA) and 5 (E2).

Resistance:

TERMINALS RESISTANCE

Terminals	Resistance	Temperature
THA - E2	13.6 to 18.4 kΩ	-20°C (-4°F)
	2.21 to 2.69 kΩ	20°C (68°F)
	0.49 to 0.67 kΩ	60°C (140°F)

INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY
1. Inspect the resistance.
  1. Using an ohmmeter, measure the resistance between the terminals.
    Resistance: 6.9 to 7.9 Ω at 20°C (68°F)
    
    Fig 1: Measuring Resistance Between Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the operation.
  1. Connect the battery positive (+) lead to terminal 1 and negative (-) lead to terminal 2, and check the movement of the valve.
    NOTE: Confirm that the valve moves freely and is not stuck in any position.
    
    HINT:
    
    Foreign objects in the oil can cause subtle pressure leaks in the valve. The pressure leaks will cause the cam to advance. This condition will usually set a DTC.
    
    Fig 2: Checking Movement Of Valve
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT THROTTLE BODY ASSY
1. Check the throttle body.
  1. Check that the throttle valve shaft is not rickety.
  2. Check that all ports are not clogged.
  3. Check that the throttle valve opens and closes smoothly.
  4. Check that there is no clearance between the throttle stop screw and throttle lever at the throttle valve closed position.
    NOTE: Do not touch the throttle stop screw.
    
    Fig 3: Inspecting Throttle Body Assy
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT THROTTLE POSITION SENSOR

Inspect the resistance.

Disconnect the throttle position sensor connector.
Using an ohmmeter, measure the resistance between terminals VC and E2.
Resistance: 2.5 to 6.0 kΩ

Check the variation in resistance between terminals VTA and E2.

Variation in resistance: The resistance value increases in proportion to the throttle lever opening value.

Fig 4: Inspecting Throttle Position Sensor Terminal Resistance

G03197099

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

THROTTLE VALVE MOVEMENT RESISTANCE

Throttle Valve Movement	Resistance
Fully open	1.9 to 4.9 kΩ
Fully close	0.2 to 1.0 kΩ

INSPECT ENGINE COOLANT TEMPERATURE SENSOR
1. Inspect the resistance.
  1. Using an ohmmeter, measure the resistance between each terminal.
    Resistance:
    
    2.29 to 2.60 kΩ at 20°C (68°F)
    
    0.301 to 0.327 kΩ at 80°C (176°F)
    
    NOTE: If checking the engine coolant temperature sensor in water, be careful not to allow water to intrude the terminals. After checking, dry the sensor.
    
    Fig 5: Measuring Resistance Between Each Terminal
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT KNOCK SENSOR
1. Inspection the resistance.
  1. Using an ohmmeter, measure the resistance between the terminal and body.
    Standard Resistance: 10 kΩ or higher
    
    If the result is not as specified, replace the knock sensor.
    
    Fig 6: Measuring Resistance Between Terminal & Body
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT EFI RELAY

Inspection the resistance.

Using an ohmmeter, measure the resistance between each terminal.

Specified condition:

EFI RELAY SPECIFIED CONDITION

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

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

Fig 7: Measuring Resistance Between Each Terminal

G03197102

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT CIRCUIT OPENING RELAY

Inspect the resistance.

Using an ohmmeter, measure the resistance between each terminal.

Specified condition:

CIRCUIT OPENING RELAY SPECIFIED CONDITION

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

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

Fig 8: Measuring Resistance Between Each Terminal

G03197103

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002