Engine Control System (Service Information): Diagnosis Toyota Yaris III

ON-VEHICLE INSPECTION

1. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Connect the Techstream to the DLC3. Start the engine and warm it up. Turn the Techstream on. Inspect the camshaft timing 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 camshaft timing 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. OK Control Range Specified Condition OFF Normal engine speed ON Rough idle or engine stalls (soon after camshaft timing oil control valve switched from OFF to ON)

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1. REMOVE NO. 2 CYLINDER HEAD COVER Remove the 4 nuts and No. 2 cylinder head cover.
2. REMOVE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Disconnect the camshaft timing oil control valve assembly connector. Remove the bolt and camshaft timing oil control valve assembly. Remove the O-ring from the camshaft timing oil control valve assembly.

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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 TEXT IN ILLUSTRATION *a Component without harness connected (Camshaft Timing Oil Control Valve Assembly) If the result is not as specified, replace the oil control valve assembly. Check the operation Connect the positive (+) lead from a battery to terminal 1 and the negative (-) lead to terminal 2, and check the movement of the valve. 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 stored. TEXT IN ILLUSTRATION *a Component without harness connected (Camshaft Timing Oil Control Valve Assembly) *b When applied *c When cut off

1. INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY Turn the ignition switch to ON without operating the accelerator pedal. NOTE: If the accelerator pedal is operated, perform the above steps again. Connect the Techstream to the DLC3 and clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-472422-S30583444012012051500000) . Start the engine and check that the MIL is not illuminated and that the idle speed is within the specified range when the A/C is switched off after the engine is warmed up. Standard (for Automatic Transaxle) Condition Engine Idle Speed A/C switched off 650 to 750 RPM Standard (for Manual Transaxle) Condition Engine Idle Speed A/C switched off 550 to 650 RPM HINT: Be sure to perform this step with all accessories off. Make sure that the shift lever is in neutral. Enter the following menus: Powertrain / Engine and ECT / Data List / Throttle Sensor Position. Fully depress the accelerator pedal and check that the value is 60% or more. Perform a road test and confirm that there are no abnormalities.

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1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
2. DRAIN ENGINE COOLANT . Refer to «REPLACEMENT - Step 1»(ref-472636-S17208798292012051500000)
3. REMOVE CYLINDER HEAD COVER NO. 2 See step 2
4. REMOVE AIR CLEANER CAP SUB-ASSEMBLY WITH AIR CLEANER HOSE NO. 1 Disconnect fuel vapor feed hose No. 1 and fuel vapor feed hose No. 2 from the vacuum switching valve assembly. Disconnect the vacuum switching valve assembly connector and wire harness clamp. Disconnect ventilation hose No. 2. Disconnect the wire harness clamp and mass air flow meter connector. Loosen the hose clamp, unlock the air cleaner assembly clamp and remove air cleaner cap sub-assembly with air cleaner hose No. 1.
5. DISCONNECT WATER BY-PASS HOSE Disconnect the water by-pass hose.
6. DISCONNECT WATER BY-PASS HOSE NO. 2 Disconnect water by-pass hose No. 2.
7. REMOVE THROTTLE WITH MOTOR BODY ASSEMBLY Disconnect the throttle with motor body assembly connector. Remove the nut and remove the wire harness with bracket. Remove the 2 nuts and remove the water filler sub-assembly with hose. Remove the bolt and 3 nuts and remove the throttle with motor body assembly. Remove the gasket from the intake manifold.

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1. INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY Check the resistance. Using an ohmmeter, measure the resistance between the terminals. Standard resistance Tester Connection Specified Condition 1 (M-) - 2 (M+) 0.3 to 100 ohms at 20°C (68°F) If the result is not as specified, replace the throttle with motor body assembly.

INSPECTION

1. INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY Measure the resistance according to the value(s) in the table below. 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 with motor body. TEXT IN ILLUSTRATION *a Component without harness connected (Throttle with Motor Body Assembly)

1. INSPECT ACCELERATOR PEDAL ASSEMBLY Connect the Techstream to the DLC3. Turn the ignition switch to ON. Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Accel Sensor Out No. 1 and Accel Sensor Out No. 2. Read the value displayed on the Techstream. Standard Voltage Condition Accel Sensor Out No. 1 Accel Sensor Out No. 2 Accelerator pedal released 0.5 to 1.1 V 1.2 to 2.0 V Accelerator pedal depressed 2.6 to 4.5 V 3.4 to 5.0 V HINT: If the results are not as specified, check the accelerator pedal, wire harness or ECM.

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1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
2. REMOVE ACCELERATOR PEDAL ASSEMBLY Disconnect the accelerator pedal connector. Remove the 2 bolts and the accelerator pedal. NOTE: Do not drop or strike the accelerator pedal. Do not disassemble the accelerator pedal.

1. INSPECT ACCELERATOR PEDAL SENSOR ASSEMBLY Connect the Techstream to the DLC3. Turn the ignition switch to ON. Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Accel Sensor Out No. 1 and Accel Sensor Out No. 2. Read the values displayed on the Techstream. Standard Voltage Tester Display Condition Specified Condition Accel Sensor Out No. 1 Accelerator pedal is released 0.5 to 1.1 V Accelerator pedal is fully depressed 2.6 to 4.5 V Accel Sensor Out No. 2 Accelerator pedal is released 1.2 to 2.0 V Accelerator pedal is fully depressed 3.4 to 4.7 V If the result is not as specified, check the accelerator pedal sensor assembly, wire harness or ECM.

Note. Perform the mass air flow meter inspection according to the procedures below. Only replace the mass air flow meter when both the LONG FT#1 value and MAF value in the DATA LIST (with the engine stopped) are not within the normal operating range.

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1. INSPECT MASS AIR FLOW METER Perform confirmation driving pattern. Connect the Techstream to the DLC3. Turn the ignition switch to ON. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-472422-S30583444012012051500000) . Start the engine and warm it up with all the accessory switches OFF (until the engine coolant temperature is 75°C (167°F) or more). Drive the vehicle at 50 km/h (31 mph) or more for 3 to 5 minutes *1. Allow the engine to idle for 2 minutes *2. Perform steps *1 and *2 at least 3 times. Read the value using the Techstream (Long FT#1). Select the following menu items: Powertrain / Engine and ECT / Data List / Long FT #1. Read the values displayed on the tester. Standard value Within -20 to 20 % If the result is not within the specified range, perform the inspection below. Read the value using the Techstream (MAF). NOTE: Turn off the engine. 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 the exhaust air duct to perform suction on the exhaust pipe. Turn the ignition switch to ACC. Turn the ignition switch ON (do not run the engine). Turn the tester ON. Select the following menu items: Powertrain / Engine and ECT / Data List / MAF. Wait 30 seconds, and read the values on the Techstream. Standard condition Less than 0.28g/sec If the result is not as specified, replace the mass air flow meter. If the result is within the specified range, investigate the cause of the extremely rich or lean air fuel ratio. Refer to «DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1)»(ref-472650-S13078786392012051500000) .

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1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
2. REMOVE MASS AIR FLOW METER Disconnect the wire harness clamp and mass air flow meter connector. Remove the 2 screws and the mass air flow meter. Remove the O-ring from the mass air flow meter.

Note. Perform the mass air flow meter inspection according to the procedures below. Only replace the mass air flow meter when the MAF value in the Data List (with the engine stopped) is not within the normal operating range or there is foreign matter on the mass air flow meter platinum hot wire (heater).

HINT

Perform "Inspection After Repairs" after replacing the mass air flow meter. Refer to INITIALIZATION .

1. INSPECT MASS AIR FLOW METER Read the value 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 to the air cleaner case (installed in the vehicle). During the test, make sure that the exhaust air duct is not drawing air from the exhaust pipe. Connect the Techstream to the DLC3. Turn the ignition switch to ON (do not run the engine). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / MAF. Wait 30 for seconds, and read the values on the Techstream. Standard Tester Display Condition Standard Condition MAF Engine not running 30 seconds after ignition switch is turned to ON 0.20 gm/sec or less If the result is not as specified, replace the mass air flow meter. If the result is within the specified range, inspect the mass air flow meter. Refer to «INSPECTION»(ref-472637-S27232163142012051500000) .

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1. REMOVE MASS AIR FLOW METER Disengage the wire harness clamp. Disconnect the connector of the mass air flow meter. Remove the 2 screws and the mass air flow meter. Remove the O-ring.

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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) OK 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 *a Component without harness connected (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 1 (THA) - 2 (E2) 20°C (68°F) 2.21 to 2.69 kohms 1 (THA) - 2 (E2) 60°C (140°F) 0.49 to 0.67 kohms If the resistance is not as specified, replace the mass air flow meter.

1. INSPECT CAMSHAFT POSITION SENSOR Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Resistance 1 - 2 20°C (68°F) 1850 to 2450 ohms HINT: In the table above, the terms Cold and Hot refer to the temperature of the coils. Cold means approximately -10 to 50 °C (14 to 122 °F). Hot means approximately 50 to 100 °C (122 to 212 °F). If the resistance is not as specified, replace the camshaft position sensor. TEXT IN ILLUSTRATION *a Component without harness connected (Camshaft Position Sensor)

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1. INSTALL CAMSHAFT POSITION SENSOR Apply a light coat of engine oil to the O-ring. TEXT IN ILLUSTRATION *1 O-ring NOTE: If reusing the camshaft position sensor, be sure to inspect the O-ring. Install the camshaft position sensor with the bolt. Torque: 8.0 N*m (82 kgf*cm, 71 in.*lbf) NOTE: If a component has been dropped or subjected to a strong impact, replace it. Make sure that the O-ring is not damaged or does not jump out of position during installation. Connect the camshaft position sensor connector.
2. INSTALL AIR CLEANER CAP SUB-ASSEMBLY WITH NO. 1 AIR CLEANER HOSE See step 2
3. INSTALL BATTERY Install the battery. Install the battery clamp with the 2 nuts. Torque: 3.5 N*m (36 kgf*cm, 31 in.*lbf)
4. INSTALL NO. 2 CYLINDER HEAD COVER See step 2
5. INSPECT FOR ENGINE OIL LEAK

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1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
2. REMOVE ENGINE UNDER COVER RH
3. REMOVE CRANKSHAFT POSITION SENSOR Disconnect the crankshaft position sensor connector. Remove the bolt and remove the crankshaft position sensor.

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1. INSPECT CRANKSHAFT POSITION SENSOR Check the resistance. Using an ohmmeter, measure the resistance between the terminals. Standard resistance Temperature Specified Condition Cold 985 to 1, 600 ohms Hot 1, 265 to 1, 890 ohms HINT: In the table above, the terms Cold and Hot refer to the temperature of the coils. Cold means approximately -10 to 50 °C (14 to 122 °F). Hot means approximately 50 to 100 °C (122 to 212 °F). If the resistance is not as specified, replace the crankshaft position sensor.

1. INSPECT HEATED OXYGEN SENSOR Check the resistance. Using an ohmmeter, measure the resistance between the terminals. Standard resistance Tester Connection Specified Condition 1 (HT1B) - 2 (+B) 11 to 16 ohms at 20°C (68°F) 1 (HT1B) - 4 (E2) 10 kohms or higher If the resistance is not as specified, replace the sensor.