SFI System: Inspection

1. 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.
2. Inspect the resistance.
   1. Using an ohmmeter, measure the resistance between terminals 4 (THA) and 5 (E2).

Resistance: 

Fig 1: Identifying Mass Air Flow Meter Graph

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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) 

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.

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 Operation Of Camshaft Timing Oil Control Valve Assembly

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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.

Fig 3: Inspecting Throttle Body Assembly

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1. Inspect the resistance.
   1. Disconnect the throttle position sensor connector.
   2. Using an ohmmeter, measure the resistance between terminals VC and E2.

      Resistance: 2.5 to 6.0 kΩ 

   3. 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. 

   HINT:

   THROTTLE POSITION SENSOR SPECIFICATIONS
   
   

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

   Fig 4: Identifying Throttle Position Sensor

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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) 

Fig 5: Inspecting Engine Coolant Temperature Sensor Graph

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1. Inspect 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: Inspecting Knock Sensor

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1. Inspection the resistance
   1. Using an ohmmeter, measure the resistance between each terminal.

Specified condition: 

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

Fig 7: Inspecting EFI Relay

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1. Inspect the resistance.
   1. Using an ohmmeter, measure the resistance between each terminal.

Specified condition: 

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

Fig 8: Inspecting Circuit Opening Relay

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