Home ReviewsRefund
Home/Toyota/Prius/Toyota Prius III (2009-2011)/Repair manual/Engine Control Systems/Engine Control System (Service Information) (Except Phv): D…
Contents Wiring diagrams Section: Engine Control Systems All sections

Engine Control System (Service Information) (Except Phv): Diagnosis Toyota Prius III

Engine Control Systems 15 illustrations ~1053 words

ON-VEHICLE INSPECTION

  1. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Connect the Techstream to the DLC3. Turn the Techstream on. Set the vehicle to the inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-393046-S20890913792011040700000) . Start the engine. Inspect the oil control valve. Enter the following menus: Powertrain/Engine and ECT/Active Test/Control the VVT System (Bank 1). Check the engine speed when the oil control valve is operated using the Techstream with the engine coolant temperature at 50°C (122°F) or less. HINT: When performing the Active Test, the air conditioning should be on. Engine coolant temperature when the engine is started should be 30°C (86°F) or less. Standard Control Range Specified Condition OFF Normal engine speed ON Rough idle or engine stalls (soon after oil control valve switched from OFF to ON)

Scheme 43

Scheme 43: REMOVAL
Scheme 43: REMOVAL

Scheme 44

Scheme 44
Scheme 44
  1. REMOVE NO. 2 CYLINDER HEAD COVER . Refer to «REMOVAL - Step 29»(ref-393186-S13883042542011040700000)
  2. REMOVE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Disconnect the camshaft timing oil control valve assembly connector. Remove the bolt and remove the camshaft timing oil control valve assembly. Remove the O-ring from the camshaft timing oil control valve assembly.

Scheme 45

Scheme 45: INSPECTION
Scheme 45: INSPECTION

Scheme 46

Scheme 46
Scheme 46
  1. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 - 2 20°C (68°F) 6.9 to 7.9 ohms If the result is not as specified, replace the oil control valve assembly. Check the operation. Connect a positive (+) battery lead to terminal 1 and a negative (-) lead to terminal 2, and check the movement of the valve. TEXT IN ILLUSTRATION *1 When Applied *2 When Cut Off NOTE: Confirm that the valve moves freely and does not stick in any position. If necessary, replace the camshaft timing oil control valve assembly. HINT: Accumulation of foreign matter can cause minor pressure leaks. Minor pressure leaks will cause the camshaft to advance or retard, and this will cause a DTC to be set.
  1. INSPECT THROTTLE BODY ASSEMBLY Check for throttle control motor operating sound. Turn the power switch on (IG). When depressing the accelerator pedal, check the operating sound of the motor. Make sure that no friction noises are emitted from the motor. If any friction noise exists, replace the throttle body assembly. Set the vehicle to the inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-393046-S20890913792011040700000) . Start the engine and check that the MIL is not illuminated. After the engine is warmed up, check that the idle speed is within the specified range when the A/C is switched off. Standard Condition Engine Idle Speed A/C switched off 950 to 1050 rpm NOTE: Be sure to perform this step with all accessories off. Make sure that park (P) is selected.

Scheme 47

Scheme 47: REMOVAL
Scheme 47: REMOVAL

Scheme 48

Scheme 48
Scheme 48

Scheme 49

Scheme 49
Scheme 49

Scheme 50

Scheme 50
Scheme 50

Scheme 51

Scheme 51
Scheme 51

Scheme 52

Scheme 52
Scheme 52

Scheme 53

Scheme 53
Scheme 53
  1. REMOVE NO. 1 ENGINE UNDER COVER
  2. DRAIN ENGINE COOLANT (for Engine) . Refer to «REPLACEMENT - Step 3»(ref-393175-S35674032612011040700000)
  3. REMOVE NO. 2 CYLINDER HEAD COVER . Refer to «REMOVAL - Step 29»(ref-393186-S13883042542011040700000)
  4. REMOVE AIR CLEANER CAP SUB-ASSEMBLY Disconnect the mass air flow meter connector. Release the 2 clamps. Loosen the hose clamp and remove the air cleaner cap.
  5. REMOVE INLET AIR CLEANER ASSEMBLY Separate the hose from the hose clamp. Separate the wire harness clamp from the inlet air cleaner assembly. Remove the 3 bolts and inlet air cleaner assembly.
  6. REMOVE AIR CLEANER CASE Remove the air cleaner filter element. Separate the hose from the 3 hose clamps. Remove the 3 bolts and air cleaner case.
  7. REMOVE AIR CLEANER HOSE ASSEMBLY Loosen the hose clamp and separate the ventilation hose. Unlock the hose clamp and remove the air cleaner hose assembly.
  8. REMOVE THROTTLE BODY ASSEMBLY Disconnect the throttle body connector and the 2 water by-pass hoses. Remove the 2 bolts, 2 nuts and throttle body assembly. Remove the gasket from the intake manifold.

Scheme 54

Scheme 54: INSPECTION
Scheme 54: INSPECTION
  1. INSPECT THROTTLE BODY ASSEMBLY Measure the resistance according to the value(s) in the table below. TEXT IN ILLUSTRATION *1 Component without harness connected (Throttle Body) Standard Resistance Tester Connection Condition Specified Condition 1 (M-) - 2 (M+) 20°C (68°F) 0.3 to 100 ohms If the result is not as specified, replace the throttle body assembly.

Note. Perform the mass air flow meter inspection in accordance with the following procedure. Replace the mass air flow meter only when foreign matter adheres to the sensor and the MAF value in the Data List (with the engine stopped) is not within the normal operating range.

  1. INSPECT MASS AIR FLOW METER Read the values using the Techstream (MAF). NOTE: Perform the inspection with the vehicle indoors and on a level surface. Perform the inspection of the mass air flow meter while it is installed into the air cleaner case (installed on the vehicle). During the test, do not use an exhaust air duct on the exhaust pipe. Connect the Techstream to the DLC3. Turn the power switch on (IG) (do not run the engine). Turn the Techstream on. Enter the following menus: Powertrain/Engine and ECT/Data List/MAF. Wait 30 seconds, and read the values on the Techstream. Standard Condition Tester Display Condition Standard Condition MAF Engine not running 30 seconds after power switch is turned on (IG) Less than 0.25 g/sec If the result is not as specified, replace the mass air flow meter. If the result is within the specified range, remove and inspect the mass air flow meter. Refer to «INSPECTION»(ref-393185-S09084174912011040700000) .

Scheme 55

Scheme 55: REMOVAL
Scheme 55: REMOVAL
  1. REMOVE NO. 2 CYLINDER HEAD COVER . Refer to «REMOVAL - Step 29»(ref-393186-S13883042542011040700000)
  2. REMOVE MASS AIR FLOW METER Disconnect the mass air flow meter connector. Remove the 2 screws and the mass air flow meter.

Scheme 56

Scheme 56: INSPECTION
Scheme 56: INSPECTION

Scheme 57

Scheme 57
Scheme 57
  1. INSPECT MASS AIR FLOW METER Perform a visual check for any foreign matter on the platinum hot wire (heater) of the mass air flow meter shown in the illustration. TEXT IN ILLUSTRATION *1 Platinum Hot Wire (Heater) Result There is no foreign matter. If the result is not as specified, replace the mass air flow meter. Measure the resistance according to the value(s) in the table below. TEXT IN ILLUSTRATION *1 Mass Air Flow Meter Standard Resistance Tester Connection Condition Specified Condition 1 (THA) - 2 (E2) -20°C (-4°F) 13.6 to 18.4 kohms 20°C (68°F) 2.21 to 2.69 kohms 60°C (140°F) 0.49 to 0.67 kohms

More articles — Engine Control System (Service Information) (Except Phv)