Engine Control (Service Information): Diagnosis Lexus HS I

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 inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-398089-S21258796492011051600000) . 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: Air conditioning should be on. 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 FRONT WIPER MOTOR AND LINK Remove the front wiper motor and link. Refer to «REMOVAL»(ref-398237-S21502581802011051600000) .
2. REMOVE WATER GUARD PLATE RH . Refer to «REMOVAL - Step 6»(ref-398212-S03672311542011051600000)
3. REMOVE NO. 2 HEATER AIR DUCT SPLASH SHIELD SEAL . Refer to «REMOVAL - Step 7»(ref-398212-S03672311542011051600000)
4. REMOVE COWL BODY MOUNTING REINFORCEMENT RH . Refer to «REMOVAL - Step 8»(ref-398212-S03672311542011051600000)
5. REMOVE OUTER COWL TOP PANEL SUB-ASSEMBLY . Refer to «REMOVAL - Step 9»(ref-398212-S03672311542011051600000)
6. REMOVE NO. 1 ENGINE COVER SUB-ASSEMBLY . Refer to «REMOVAL - Step 29»(ref-398215-S40139586082011051600000)
7. 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.

Scheme 183

1. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Resistance inspection. Using an ohmmeter, measure the resistance according to the value(s) in the table below. Standard resistance 6.9 to 7.9 ohms at 20°C (68°F) If necessary, replace the camshaft timing oil control valve assembly. Movement inspection. TEXT IN ILLUSTRATION *1 Valve Connect a positive (+) lead from the battery to terminal 1 and a 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 objects causes subtle pressure leaks. The subtle pressure leaks will cause the camshaft to advance, and this will cause a DTC to be set.

Scheme 184

1. INSTALL CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Apply a light coat of engine oil to a new O-ring and install it onto the camshaft timing oil control valve assembly. TEXT IN ILLUSTRATION *1 New O-ring NOTE: Do not twist the O-ring. Install the camshaft timing oil control valve assembly with the bolt. Torque: 9.0 N*m (92 kgf*cm, 80 in.*lbf) Connect the camshaft timing oil control valve assembly connector.
2. INSTALL NO. 1 ENGINE COVER SUB-ASSEMBLY . Refer to «INSTALLATION - Step 95»(ref-398215-S14438457332011051600000)
3. INSTALL OUTER COWL TOP PANEL SUB-ASSEMBLY . Refer to «INSTALLATION - Step 22»(ref-398212-S16707862502011051600000)
4. INSTALL COWL BODY MOUNTING REINFORCEMENT RH . Refer to «INSTALLATION - Step 23»(ref-398212-S16707862502011051600000)
5. INSTALL NO. 2 HEATER AIR DUCT SPLASH SHIELD SEAL . Refer to «INSTALLATION - Step 24»(ref-398212-S16707862502011051600000)
6. INSTALL WATER GUARD PLATE RH . Refer to «INSTALLATION - Step 25»(ref-398212-S16707862502011051600000)
7. INSTALL FRONT WIPER MOTOR AND LINK Install the front wiper motor and link. Refer to «INSTALLATION»(ref-398237-S32958443482011051600000) .

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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 inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-398089-S21258796492011051600000) . 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 850 to 950 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 COOLANT (for Engine) . Refer to «REPLACEMENT - Step 2»(ref-398217-S29765876382011051600000)
3. REMOVE FRONT WIPER MOTOR AND LINK Remove the front wiper motor and link. Refer to «REMOVAL»(ref-398237-S21502581802011051600000) .
4. REMOVE WATER GUARD PLATE RH . Refer to «REMOVAL - Step 6»(ref-398212-S03672311542011051600000)
5. REMOVE NO. 2 HEATER AIR DUCT SPLASH SHIELD SEAL . Refer to «REMOVAL - Step 7»(ref-398212-S03672311542011051600000)
6. REMOVE COWL BODY MOUNTING REINFORCEMENT RH . Refer to «REMOVAL - Step 8»(ref-398212-S03672311542011051600000)
7. REMOVE OUTER COWL TOP PANEL SUB-ASSEMBLY . Refer to «REMOVAL - Step 9»(ref-398212-S03672311542011051600000)
8. REMOVE NO. 1 ENGINE COVER SUB-ASSEMBLY . Refer to «REMOVAL - Step 29»(ref-398215-S40139586082011051600000)
9. REMOVE AIR CLEANER CAP SUB-ASSEMBLY Disconnect the mass air flow meter connector and clamp. HINT: Push down on the tab to disengage the claw, and then slide the harness toward the rear of the vehicle to disengage it. TEXT IN ILLUSTRATION *1 Tab *a Viewed from rear Disconnect the No. 2 ventilation hose. Disconnect the purge VSV connector and wire harness clamp [A]. Disconnect the purge VSV vacuum hose [B]. Disconnect the purge line hose [C]. Lock the No. 1 air cleaner hose clamp, and then disconnect the No. 1 air cleaner hose from the throttle body. Remove the 2 clamps and air cleaner cap sub-assembly.
10. REMOVE THROTTLE BODY ASSEMBLY Remove the purge VSV vacuum hose. Remove the bolt and separate the fuel pipe support from the throttle body. Disconnect the throttle body connector. Disconnect the 2 water by-pass hoses from the throttle body. Remove the 3 bolts and throttle body Remove the gasket from the intake manifold.

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1. INSPECT THROTTLE BODY ASSEMBLY Using an ohmmeter, measure the resistance between the terminals. TEXT IN ILLUSTRATION *a Component without harness connected (Throttle Body) Standard Resistance Terminal No. (Symbol) Resistance Temperature 2 (M+) - 1 (M-) 0.3 to 100 ohms 20°C (68°F) If the result is not as specified, replace the throttle body assembly.

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1. INSTALL THROTTLE BODY ASSEMBLY Install a new gasket onto the intake manifold. TEXT IN ILLUSTRATION *1 New Gasket Install the throttle body with the 3 bolts. Torque: 30 N*m (305 kgf*cm, 22 ft.*lbf) Connect the 2 water by-pass hoses to the throttle body. Connect the throttle body connector. Install the fuel pipe support with the bolt. Torque: 30 N*m (305 kgf*cm, 22 ft.*lbf) Connect the purge line hose to the throttle body.
2. INSTALL AIR CLEANER CAP SUB-ASSEMBLY Insert the hinges. Install the air cleaner cap sub-assembly with the 2 clamps. Align the matchmarks of the No. 1 air cleaner hose and throttle body. Connect the No. 1 air cleaner hose to the throttle body and unfasten the No. 1 air cleaner hose clamp. NOTE: Make sure that the hose clamp is at the correct angle as shown in the illustration. Connect the purge line hose. Connect the purge VSV vacuum hose. Connect the purge VSV connector. Connect the No. 2 ventilation hose to the hose. Connect the mass air flow meter connector and clamp.
3. ADD COOLANT (for Engine) . Refer to «REPLACEMENT - Step 3»(ref-398217-S29765876382011051600000)
4. INSPECT FOR COOLANT LEAK (for Engine)
5. INSTALL NO. 1 ENGINE UNDER COVER
6. INSTALL NO. 1 ENGINE COVER SUB-ASSEMBLY . Refer to «INSTALLATION - Step 95»(ref-398215-S14438457332011051600000)
7. INSTALL OUTER COWL TOP PANEL SUB-ASSEMBLY . Refer to «INSTALLATION - Step 22»(ref-398212-S16707862502011051600000)
8. INSTALL COWL BODY MOUNTING REINFORCEMENT RH . Refer to «INSTALLATION - Step 23»(ref-398212-S16707862502011051600000)
9. INSTALL NO. 2 HEATER AIR DUCT SPLASH SHIELD SEAL . Refer to «INSTALLATION - Step 24»(ref-398212-S16707862502011051600000)
10. INSTALL WATER GUARD PLATE RH . Refer to «INSTALLATION - Step 25»(ref-398212-S16707862502011051600000)
11. INSTALL FRONT WIPER MOTOR AND LINK Install the front wiper motor and link. Refer to «INSTALLATION»(ref-398237-S32958443482011051600000) .
12. 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 hybrid vehicle control ECU. Disconnect the cable from the negative (-) battery terminal. NOTE: After the power switch is turned off, the display and navigation module display (HDD navigation system) records various types of memory and settings. As a result, after turning the power switch off, make sure to wait at least 60 seconds before disconnecting the cable from the negative (-) battery terminal. Connect the Techstream to the DLC3 and clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-398225-S11190546532011051600000) . Set the vehicle to inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-398089-S21258796492011051600000) . 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 850 to 950 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. INSPECT MASS AIR FLOW METER Read values 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 MAF meter while it is installed to the air cleaner case (installed to the vehicle). During the test, do not use an exhaust air duct on the exhaust pipe. Turn the power switch on (IG). 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 Less than 0.49 g/sec. If the result is not as specified, replace the MAF meter. If the result is within the specified range, visually inspect the AFM as described in the following inspection procedure.

Scheme 199

1. REMOVE FRONT WIPER MOTOR AND LINK Remove the front wiper motor and link. Refer to «REMOVAL»(ref-398237-S21502581802011051600000) .
2. REMOVE WATER GUARD PLATE RH . Refer to «REMOVAL - Step 6»(ref-398212-S03672311542011051600000)
3. REMOVE NO. 2 HEATER AIR DUCT SPLASH SHIELD SEAL . Refer to «REMOVAL - Step 7»(ref-398212-S03672311542011051600000)
4. REMOVE COWL BODY MOUNTING REINFORCEMENT RH . Refer to «REMOVAL - Step 8»(ref-398212-S03672311542011051600000)
5. REMOVE OUTER COWL TOP PANEL SUB-ASSEMBLY . Refer to «REMOVAL - Step 9»(ref-398212-S03672311542011051600000)
6. REMOVE MASS AIR FLOW METER Disconnect the mass air flow meter connector. Remove the 2 screws and 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 No foreign matter attached. 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

INSPECTION

1. INSPECT CRANKSHAFT POSITION SENSOR Measure the resistance according to the value(s) in the table below. Standard Resistance Temperature Specified Condition Cold 985 to 1600 ohms Hot 1265 to 1890 ohms NOTE: "Cold" and "Hot" mean the temperature of the coils themselves. "Cold" is from -10 to 50°C (14 to 122°F) and "Hot" is from 50 to 100°C (122 to 212°F). If the resistance is not as specified, replace the sensor.

Scheme 202

1. INSTALL CRANKSHAFT POSITION SENSOR Apply a light coat of engine oil to the O-ring on the crankshaft position sensor. Install the crankshaft position sensor with the bolt. TEXT IN ILLUSTRATION *1 Rib *2 Wire Harness Bracket Torque: 9.0 N*m (92 kgf*cm, 80 in.*lbf) Connect the crankshaft position sensor connector.
2. INSTALL V-RIBBED BELT TENSIONER ASSEMBLY . Refer to «INSTALLATION - Step 20»(ref-398215-S04499505652011051600000)
3. INSTALL V-RIBBED BELT Install the V-ribbed belt. Refer to «INSTALLATION»(ref-398215-S15860419812011051600000) .
4. INSTALL ELECTRIC INVERTER COMPRESSOR Install the electric inverter compressor. Refer to «INSTALLATION»(ref-398224-S15338751352011051600000) .

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1. REMOVE NO. 1 ENGINE COVER SUB-ASSEMBLY . Refer to «REMOVAL - Step 29»(ref-398215-S40139586082011051600000)
2. REMOVE IGNITION COIL ASSEMBLY Disconnect the 4 ignition coil connectors. Remove the 4 bolts and 4 ignition coils.
3. REMOVE SPARK PLUG Remove the 4 spark plugs.

1. KNOCK CONTROL SENSOR Using an ohmmeter, measure the resistance according to the value(s) in the table below. Standard resistance 120 to 280 kohms at 20°C (68°F) If the resistance is not as specified, replace the sensor.

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1. INSTALL KNOCK SENSOR Install the knock sensor with the nut. TEXT IN ILLUSTRATION *a Up Torque: 20 N*m (204 kgf*cm, 15 ft.*lbf) NOTE: Make sure that the knock sensor is in the correct position. Connect the knock sensor connector.
2. INSTALL INTAKE MANIFOLD Install the intake manifold. Refer to «INSTALLATION - Step 1»(ref-398234-S42397669312011051600000) .

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1. REMOVE NO. 1 ENGINE COVER SUB-ASSEMBLY . Refer to «REMOVAL - Step 29»(ref-398215-S40139586082011051600000)
2. REMOVE AIR FUEL RATIO SENSOR Disconnect the air fuel ratio sensor connector. Using SST, remove the air fuel ratio sensor. SST: 09224-00010 NOTE: Do not damage the air fuel ratio sensor.

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1. INSPECT AIR FUEL RATIO SENSOR Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 (HA1A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 ohms 1 (HA1A) - 4 (A1A-) - 10 kohms or higher TEXT IN ILLUSTRATION *a Component without harness connected (Air Fuel Ratio Sensor) If the result is not as specified, replace the sensor.

Scheme 211

1. INSTALL AIR FUEL RATIO SENSOR Temporarily tighten the air fuel ratio sensor. Using SST, fully tighten the air fuel ratio sensor. TEXT IN ILLUSTRATION *1 Fulcrum Length 30 mm SST: 09224-00010 without SST Torque: 44 N*m (449 kgf*cm, 32 ft.*lbf) with SST Torque: 39 N*m (398 kgf*cm, 29 ft.*lbf) NOTE: The "with SST" torque value is effective when using SST with a fulcrum length of 30 mm (1.18 in.). The "with SST" torque value is effective when using a torque wrench with a fulcrum length of 260 mm (10.23 in.). This torque value is effective when SST is parallel to the torque wrench. Refer to «PRECAUTION»(ref-398089-S41696268642011051600000) . Connect the air fuel ratio sensor connector.
2. INSPECT FOR EXHAUST GAS LEAK
3. INSTALL NO. 1 ENGINE COVER SUB-ASSEMBLY . Refer to «INSTALLATION - Step 95»(ref-398215-S14438457332011051600000)

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1. REMOVE OXYGEN SENSOR Disconnect the oxygen sensor connector. Using SST, remove the oxygen sensor from the front exhaust pipe assembly. SST: 09224-00010 NOTE: Do not damage the oxygen sensor.

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1. INSPECT OXYGEN SENSOR Measure the resistance according to the value(s) in the table below. TEXT IN ILLUSTRATION *1 Component without harness connected (Oxygen Sensor) Standard Resistance Tester Connection Condition Specified Condition 1 (HT) - 2 (+B) 20°C (68°F) 11 to 16 ohms 1 (HT) - 4 (E) - 10 kohms or higher If the resistance is not as specified, replace the sensor.

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1. INSTALL OXYGEN SENSOR Temporarily tighten the oxygen sensor. NOTE: Do not damage the oxygen sensor. Using SST, fully tighten the oxygen sensor. TEXT IN ILLUSTRATION *1 Fulcrum Length 30 mm SST: 09224-00010 without SST Torque: 44 N*m (449 kgf*cm, 32 ft.*lbf) with SST Torque: 39 N*m (398 kgf*cm, 29 ft.*lbf) NOTE: The "with SST" torque value is effective when using SST with a fulcrum length of 30 mm (1.18 in.). The "with SST" torque value is effective when using a torque wrench with a fulcrum length of 260 mm (10.23 in.). This torque value is effective when SST is parallel to the torque wrench. Refer to «PRECAUTION»(ref-398089-S41696268642011051600000) . Connect the oxygen sensor connector.
2. INSPECT FOR EXHAUST GAS LEAK

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1. REMOVE NO. 1 RELAY BLOCK COVER
2. REMOVE NO. 1 INTEGRATION RELAY Using a screwdriver with its tip wrapped with protective tape, disengage the 2 claws and disconnect the No. 1 integration relay. Disconnect the 3 connectors.

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1. INSPECT NO. 1 INTEGRATION RELAY TEXT IN ILLUSTRATION *1 Integration Relay IG2 RELAY: Measure the resistance according to the value(s) in the table below. TEXT IN ILLUSTRATION *1 Integration Relay Standard Resistance Tester Connection Condition Specified Condition Integration relay (C-1) - Integration relay (A-4) Battery voltage is not applied between terminals A-2 and A-3 10 kohms or higher Integration relay (C-1) - Integration relay (A-4) Battery voltage is applied between terminals A-2 and A-3 Below 1 ohms If the resistance is not as specified, replace the integration relay. EFI MAIN RELAY: Measure the resistance according to the value(s) in the table below. TEXT IN ILLUSTRATION *1 Integration Relay Standard Resistance Tester Connection Condition Specified Condition Integration relay (C-1) - Integration relay (B-4) Battery voltage is not applied between terminals B-2 and B-3 10 kohms or higher Integration relay (C-1) - Integration relay (B-4) Battery voltage is applied between terminals B-2 and B-3 Below 1 ohms If the resistance is not as specified, replace the integration relay. C/OPN RELAY: Measure the resistance according to the value(s) in the table below. TEXT IN ILLUSTRATION *1 Integration Relay Standard Resistance Tester Connection Condition Specified Condition Integration relay (B-5) - Integration relay (B-8) Battery voltage is not applied between terminals B-6 and B-7 10 kohms or higher Integration relay (B-5) - Integration relay (B-8) Battery voltage is applied between terminals B-6 and B-7 Below 1 ohms If the resistance is not as specified, replace the integration relay. BATT FAN RELAY: Measure the resistance according to the value(s) in the table below. TEXT IN ILLUSTRATION *1 Integration Relay Standard Resistance Tester Connection Condition Specified Condition Integration relay (C-1) - Integration relay (A-8) Battery voltage is not applied between terminals A-6 and A-7 10 kohms or higher Integration relay (C-1) - Integration relay (A-8) Battery voltage is applied between terminals A-6 and A-7 Below 1 ohms If the resistance is not as specified, replace the integration relay.