Engine Control System (Service Information) (Base): Diagnosis Toyota Prius Plug-in

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-551389-S33941292062013051500000) . 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)

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1. REMOVE NO. 2 CYLINDER HEAD COVER . Refer to «REMOVAL - Step 29»(ref-551529-S15028899452013051500000)
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.

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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 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-551389-S33941292062013051500000) . 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.

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1. REMOVE NO. 1 ENGINE UNDER COVER
2. DRAIN ENGINE COOLANT (for Engine) . Refer to «REPLACEMENT - Step 2»(ref-551517-S04798955622013051500000)
3. REMOVE NO. 2 CYLINDER HEAD COVER . Refer to «REMOVAL - Step 29»(ref-551529-S15028899452013051500000)
4. REMOVE AIR CLEANER CAP SUB-ASSEMBLY Disconnect the connector. Loosen the hose clamp and disconnect the air cleaner hose assembly. Remove the 2 clamps and air cleaner cap subassembly.
5. REMOVE INLET AIR CLEANER ASSEMBLY Remove the 2 bolts and inlet air cleaner assembly.
6. REMOVE AIR CLEANER CASE Remove the air cleaner filter element sub-assembly. Separate the hose from the 3 clamps. Remove the 3 bolts and air cleaner case.
7. REMOVE AIR CLEANER HOSE ASSEMBLY Disconnect the ventilation hose from the cylinder head cover sub-assembly. Loosen the hose clamp and remove the air cleaner hose assembly.
8. REMOVE THROTTLE BODY ASSEMBLY Type A: 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. Type B: Disconnect the connector. Disconnect the No. 1 water by-pass hose and No. 2 water bypass hose. Remove the 4 bolts and throttle body assembly. Remove the gasket from the intake manifold.

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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.

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1. INSTALL THROTTLE BODY ASSEMBLY Type A: Install a new gasket onto the intake manifold. HINT: Orient the protrusion of the gasket as shown in the illustration. TEXT IN ILLUSTRATION *a Protrusion Install the throttle body assembly with the 2 bolts and 2 nuts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Connect the No. 1 water by-pass hose and No. 2 water by-pass hose. Connect the connector. Type B: Install a new gasket onto the intake manifold. HINT: Orient the protrusion of the gasket as shown in the illustration. TEXT IN ILLUSTRATION *a Protrusion Install the throttle body assembly with the 4 bolts. Connect the No. 1 water by-pass hose and No. 2 water by-pass hose. Connect the connector.
2. INSTALL AIR CLEANER HOSE ASSEMBLY Install the air cleaner hose assembly and tighten the hose clamp. Connect the ventilation hose to the cylinder head cover sub-assembly.
3. INSTALL AIR CLEANER CASE Install the air cleaner case with the 3 bolts. Torque: 7.0 N*m (71 kgf*cm, 62 in.*lbf) Install the hose to the 3 clamps. Install the air cleaner filter element sub-assembly.
4. INSTALL INLET AIR CLEANER ASSEMBLY Install the inlet air cleaner assembly with the 2 bolts. Torque: 7.0 N*m (71 kgf*cm, 62 in.*lbf)
5. INSTALL AIR CLEANER CAP SUB-ASSEMBLY Install the air cleaner cap sub-assembly with the 2 clamps. Connect the air cleaner hose assembly and tighten the hose clamp. Connect the connector.
6. ADD ENGINE COOLANT (for Engine) . Refer to «REPLACEMENT - Step 3»(ref-551517-S04798955622013051500000)
7. INSPECT FOR COOLANT LEAK (for Engine) . Refer to «ON-VEHICLE INSPECTION - Step 1»(ref-551533-S21765130552013051500000)
8. INSTALL NO. 2 CYLINDER HEAD COVER . Refer to «INSTALLATION - Step 97»(ref-551529-S36492398042013051500000)
9. INSTALL NO. 1 ENGINE UNDER COVER
10. PERFORM INITIALIZATION NOTE: Be sure to perform this procedure after reassembling the throttle body assembly, removing and reinstalling any throttle body component or replacing the ECM. Disconnect the cable from the negative (-) battery terminal. Wait at least 60 seconds and reconnect the cable. Connect the Techstream to the DLC3 and clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-551395-S24983050562013051500000) . Set the vehicle to the inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-551389-S33941292062013051500000) . Start the engine without operating the accelerator pedal and check that the MIL is not illuminated and that the idle speed is within the specified range when the air conditioning is switched off after the engine is warmed up. Standard Condition Engine Idle Speed A/C switched off 950 to 1050 RPM NOTE: If the accelerator pedal is operated, perform the above steps again. Be sure to perform this step with all accessories off. Make sure that park (P) is selected. Perform a road test and confirm that there are no abnormalities.

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1. REMOVE REAR NO. 2 FLOOR BOARD (for Separate Type) . Refer to «REMOVAL - Step 1»(ref-551539-S33525440432013051500000)
2. REMOVE REAR DECK FLOOR BOX . Refer to «REMOVAL - Step 2»(ref-551539-S33525440432013051500000)
3. REMOVE REAR NO. 3 FLOOR BOARD . Refer to «REMOVAL - Step 3»(ref-551539-S33525440432013051500000)
4. DISCONNECT CABLE FROM AUXILIARY BATTERY NEGATIVE TERMINAL
5. SEPARATE INVERTER RESERVE TANK ASSEMBLY Remove the 2 bolts and separate the inverter reserve tank assembly.
6. REMOVE ECM Remove the No. 1 relay block cover. Disconnect the 3 wire harness connectors. Disengage the 2 claws, push up the engine room wire harness and separate it from the engine room relay block. Disengage the 2 claws and push up the side cover to remove it. Loosen the bolt and separate the No. 2 engine room wire. Disconnect the 2 ECM connectors. Disconnect the 2 wire harness clamps. Push the locks on the 2 levers, then raise the levers, and disconnect the 2 ECM connectors. NOTE: After disconnecting the connectors, make sure that dirt, water or other foreign matter does not contact the connecting parts of the connectors. Separate the 2 wire harness clamps. Remove the 2 bolts and ECM with 2 ECM brackets.

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1. INSTALL ECM Install the ECM with the 2 bolts. Torque: 13 N*m (133 kgf*cm, 10 ft.*lbf) Install the 2 wire harness clamps. Connect the 2 ECM connectors. Connect the 2 ECM connectors and lower the 2 levers. NOTE: When connecting the connectors, make sure that dirt, water or other foreign matter does not get caught between the connectors and other parts. Make sure that the 2 levers are securely locked. Install the 2 wire harness clamps. Install the No. 2 engine room wire with the bolt. Torque: 8.3 N*m (85 kgf*cm, 73 in.*lbf) Slide the side cover down and engage the 2 claws to install it. Slide the engine room wire harness down and engage the 2 claws to install it. Connect the 3 wire harness connectors. Install the No. 1 relay block cover.
2. INSTALL INVERTER RESERVE TANK ASSEMBLY Install the inverter reserve tank assembly with the 2 bolts. Torque: 18 N*m (184 kgf*cm, 13 ft.*lbf)
3. CONNECT CABLE TO AUXILIARY BATTERY NEGATIVE TERMINAL
4. INSTALL REAR NO. 3 FLOOR BOARD . Refer to «INSTALLATION - Step 58»(ref-551539-S14103279012013051500000)
5. INSTALL REAR DECK FLOOR BOX . Refer to «INSTALLATION - Step 59»(ref-551539-S14103279012013051500000)
6. INSTALL REAR NO. 2 FLOOR BOARD (for Separate Type) . Refer to «INSTALLATION - Step 60»(ref-551539-S14103279012013051500000)
7. PERFORM INITIALIZATION HINT: Initialization cannot be completed by only disconnecting and reconnecting the cable of the negative (-) battery terminal. Perform Initialization when replacing the ECM See step 10 .

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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-551525-S38338970442013051500000) .

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1. REMOVE NO. 2 CYLINDER HEAD COVER . Refer to «REMOVAL - Step 29»(ref-551529-S15028899452013051500000)
2. REMOVE MASS AIR FLOW METER Disconnect the mass air flow meter connector. Remove the 2 screws and the mass air flow meter.

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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) 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