Engine Control System: Inspection

INSPECT MASS AIR FLOW METER

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 the negative (-) tester probe to terminal E2G.
3. Blow air into the MAF meter, and check that the voltage fluctuates.

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

Standard:

MASS AIR FLOW METER CONDITION

Condition	Specified Condition
-20 °C (-4°F)	13.6 to 18.4 kΩ
20°C (68°F)	2.21 to 2.69 kΩ
60°C (140°F)	0.493 to 0.667 kΩ

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

Fig 1: 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.
  OK:
  
  Fig 2: Camshaft Timing Oil Control Valve Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If operation is not as specified, replace the valve.
  
  Fig 3: Inspecting Camshaft Timing Oil Control Valve Assy
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT THROTTLE W/MOTOR BODY ASSY

Measure the resistance between the terminals.

Standard:

THROTTLE W/MOTOR BODY CONDITION

Tester Connection	Condition	Specified Condition
2 (M+) - 1 (M-)	20°C (68°F)	0.3 to 100 Ω
5(VC)-3 (E2)	20°C(68°F)	1.2 to 3.2kΩ

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

Fig 4: Inspecting Throttle W/Motor Body Assy

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT ENGINE COOLANT TEMPERATURE SENSOR

Measure the resistance between the terminals. Standard:

ENGINE COOLANT TEMPERATURE CONDITION

Condition	Specified Condition
Approx. 20°C (68°F)	2.32 to 2.59 kΩ
Approx. 80°C (176°F)	0.31 to 0.326 kΩ

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.

Fig 5: Inspecting Engine Coolant Temperature Sensor

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT KNOCK CONTROL 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 6: Inspecting Knock Control Sensor
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT ENGINE ROOM JUNCTION BLOCK ASSY

Inspect circuit opening relay

Using an ohmmeter, measure the resistance between the terminals.

Fig 7: Inspecting Circuit Opening Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
1D-5 - 1D-3	10 kΩ or higher
1D-5 - 1D-3	Below 1 Ω (Apply battery voltage to terminals 1G-5 and 1H-9)

If the result is not as specified, replace the engine room junction block assy.

Inspect EFI relay

Using an ohmmeter, measure the resistance between the terminals.

Fig 8: Inspecting EFI Relay

Standard:

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
1D-4 - 1D-6	10 kΩ or higher
1D-4-1D-6	Below 1 Ω (Apply battery voltage to terminals 1H-10 and 1H-2)

If the result is not as specified, replace the engine room junction block assy.

Inspect A/F relay

Using an ohmmeter, measure the resistance between the terminals.

Standard:

Fig 9: Inspecting A/F Relay

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
1F-1 - 1C-6	10 kΩ or higher
1F-1 - 1C-6	Below 1 Ω (Apply battery voltage to terminals 1D-5 and 1H-2)

If the result is not as specified, replace the engine room junction block assy.