SFI System: Inspection

WARNING: This page is about a different car, the 2004 Lexus LS 430. 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 1 (+B) and 2 (E2G).
  2. Using a voltmeter, connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E2G.
  3. Blow air in to the MAF meter, and check that the voltage fluctuates.
2. Measure the resistance between terminals 4 (THA) and 5 (E2).
Standard:

Fig 1: Terminals 4 (THA) And 5 (E2) Resistance Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Fig 2: Inspecting Mass Air Flow Meter
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY
1. Using an ohmmeter, measure the resistance between the terminals.
  Standard: 6.9 to 7.9 Ω at 20°C (68°F)
2. Connect the battery's positive (+) lead to terminal 1 and negative (-) lead to terminal 2. Check the movement of the valve.
  
  Fig 3: Valve Movement Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If operation is not as specified, replace the valve.
  
  Fig 4: Inspecting Camshaft Timing Oil Control Valve Assy
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT ACCELERATOR PEDAL ROD ASSY
1. Measure the resistance between the terminals.
Standard:

Fig 5: Terminals Resistance Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Fig 6: Identifying Accelerator Pedal Rod Assy Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT THROTTLE BODY ASSY
1. Measure the resistance between the terminals.
Standard:

Fig 7: Terminals Resistance Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Fig 8: Identifying Throttle Body Assy Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT ENGINE COOLANT TEMPERATURE SENSOR
1. Measure the resistance between terminals 1 and 2.
Standard:

Fig 9: Coolant Temperature Sensor Terminals 1 And 2 Resistance Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

Fig 10: Inspecting Engine Coolant Temperature Sensor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT KNOCK SENSOR
1. Using an ohmmeter, measure the resistance between the terminals.
  Standard: 120 to 280 kΩ at 20°C (68°F)
  
  If the result is not as specified, replace the sensor.
  
  Fig 11: Measuring Resistance Between Knock Sensor Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT RELAY (Marking: EFI, C/OPN)
1. Remove the EFI and C/OPN relays from the engine room R/B.
2. Measure the resistance of the relay.
Standard:

Fig 12: Relay Resistance Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Fig 13: Inspecting Relay (Marking: EFI, C/OPN)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT RELAY (Marking: F/PMP)
1. Remove the F/PMP relay from the engine room R/B.
2. Measure the resistance of the F/PMP relay.
Standard:

Fig 14: F/PMP Relay Resistance Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Fig 15: Inspecting Relay (Marking: F/PMP)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002