Engine Control System (Service Information): Removal & Installation Lexus GX J150

INSTALLATION

1. INSTALL CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (for Exhaust Side of Bank 1) Apply a light coat of engine oil to a new O-ring. Install the O-ring to the camshaft timing oil control valve. Install the camshaft timing oil control valve with the bolt. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Connect the camshaft timing oil control valve connector.
2. INSTALL CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (for Intake Side of Bank 1) Apply a light coat of engine oil to a new O-ring. Install the O-ring to the camshaft timing oil control valve. Install the camshaft timing oil control valve with the bolt. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Connect the camshaft timing oil control valve connector.
3. INSTALL CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (for Intake Side of Bank 2) Apply a light coat of engine oil to a new O-ring. Install the O-ring to the camshaft timing oil control valve. Install the camshaft timing oil control valve with the bolt. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Connect the camshaft timing oil control valve connector.
4. INSTALL CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (for Exhaust Side of Bank 2) Apply a light coat of engine oil to a new O-ring. Install the O-ring to the camshaft timing oil control valve. Install the camshaft timing oil control valve with the bolt. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Connect the camshaft timing oil control valve connector.
5. INSTALL AIR CLEANER CAP AND HOSE . Refer to «INSTALLATION - Step 53»(ref-524246-S15625075792013012800000)
6. INSTALL V-BANK COVER SUB-ASSEMBLY . Refer to «INSTALLATION - Step 80»(ref-524246-S15625075792013012800000)

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1. INSTALL NO. 2 ECM BRACKET Install the No. 2 ECM bracket with the 2 screws. Torque: 3.0 N*m (31 kgf*cm, 27 in.*lbf)
2. INSTALL ECM BRACKET Install the ECM bracket with the 2 screws. Torque: 3.0 N*m (31 kgf*cm, 27 in.*lbf)
3. INSTALL ECM Install the ECM with the bolt and nut. Torque: 8.0 N*m (82 kgf*cm, 71 in.*lbf) Connect the 6 ECM connectors.
4. INSTALL INSTRUMENT PANEL BOX ASSEMBLY Install the instrument panel box. Refer to «INSTALLATION»(ref-524278-S10028951642013012800000) .

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1. INSTALL ACCELERATOR PEDAL POSITION SENSOR ASSEMBLY NOTE: Avoid physical shocks to the accelerator pedal position sensor. Do not disassemble the accelerator pedal position sensor. Install the accelerator pedal position sensor with the 2 nuts. Torque: 5.4 N*m (55 kgf*cm, 48 in.*lbf) Connect the accelerator pedal position sensor connector.
2. INSTALL FRONT NO. 1 CONSOLE BOX INSERT . Refer to «INSTALLATION - Step 9»(ref-524278-S04260668782013012800000)

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1. CHECK MASS AIR FLOW METER ASSEMBLY Check the mass air flow value. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / All Data / MAF. Blow air into the mass air flow meter and check that the mass air flow value fluctuates. TEXT IN ILLUSTRATION Air If the result is not as specified, check the mass air flow meter. Refer to «INSPECTION»(ref-524262-S03318204512013012800000) or wiring and ECM. Refer to «DTC P0102: Mass or Volume Air Flow Circuit Low Input; DTC P0103: Mass or Volume Air Flow Circuit High Input»(ref-524266-S15908714842013012800000) .

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1. REMOVE AIR CLEANER CAP SUB-ASSEMBLY Detach the clamp and disconnect the mass air flow meter connector. Loosen the hose clamp. Detach the 4 clips and remove the bolt and air cleaner cap.
2. REMOVE MASS AIR FLOW METER ASSEMBLY Remove the 2 screws and mass air flow meter.

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1. INSPECT MASS AIR FLOW METER ASSEMBLY Check the output voltage. Apply battery voltage across terminals 1 (+B) and 2 (E2G). TEXT IN ILLUSTRATION *a Component without harness connected (Mass Air Flow Meter) Air NOTE: While using the battery during inspection, do not bring the positive and negative tester probes too close to each other as a short circuit may occur. Using a voltmeter, connect the positive (+) tester probe to terminal 3 (VG) and the negative (-) tester probe to terminal 2 (E2G). Blow air into the mass air flow meter and check that the voltage fluctuates. If the result is not as specified, replace the mass air flow meter assembly. Perform a visual check for any foreign matter on the platinum hot wire (heater) of the mass air flow meter shown in the illustration. OK There is no foreign matter. TEXT IN ILLUSTRATION *1 Platinum Hot Wire (Heater) If the result is not as specified, replace the mass air flow meter assembly. Check the intake air temperature sensor. TEXT IN ILLUSTRATION *1 Resistance *2 Temperature *3 Acceptable - - *a Component without harness connected (Mass Air Flow Meter) - - Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 4 (THA) - 5 (E2) -20°C (-4°F) 12.5 k to 16.9 kohms 4 (THA) - 5 (E2) 20°C (68°F) 2.19 k to 2.67 kohms 4 (THA) - 5 (E2) 60°C (140°F) 0.50 k to 0.68 kohms If the result is not as specified, replace the mass air flow meter assembly.

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1. INSTALL MASS AIR FLOW METER ASSEMBLY Install the mass air flow meter with the 2 screws. Torque: 1.0 N*m (10 kgf*cm, 9 in.*lbf)
2. INSTALL AIR CLEANER CAP SUB-ASSEMBLY Attach the 4 clips and install the air cleaner cap with the bolt. Torque: 5.0 N*m (51 kgf*cm, 44 in.*lbf) TEXT IN ILLUSTRATION *1 Air Cleaner Cap *2 Air Cleaner Hose *3 Groove *4 Protrusion *a Upper Side *b Front HINT: When installing the air cleaner hose, align its groove with the protrusion of the throttle body as shown in the illustration. Tighten the hose clamp. Torque: 5.0 N*m (51 kgf*cm, 44 in.*lbf) HINT: Make sure the direction of the hose clamp is as shown in the illustration. Attach the clamp and connect the mass air flow meter connector.

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1. REMOVE V-BANK COVER SUB-ASSEMBLY . Refer to «REMOVAL - Step 15»(ref-524246-S36416482222013012800000)
2. REMOVE AIR CLEANER CAP AND HOSE . Refer to «REMOVAL - Step 23»(ref-524246-S36416482222013012800000)
3. REMOVE CAMSHAFT POSITION SENSOR Disconnect the camshaft position sensor connector. Remove the bolt and camshaft position sensor.
4. REMOVE VVT SENSOR Disconnect the 4 VVT sensor connectors. TEXT IN ILLUSTRATION *A for Bank 2 *B for Bank 1 Remove the 4 bolts and 4 VVT sensors.

1. INSTALL VVT SENSOR Install the 4 VVT sensors with the 4 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Connect the 4 VVT sensor connectors.
2. INSTALL CAMSHAFT POSITION SENSOR Install the camshaft position sensor with the bolt. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Connect the camshaft position sensor connector.
3. INSTALL AIR CLEANER CAP AND HOSE . Refer to «INSTALLATION - Step 53»(ref-524246-S15625075792013012800000)
4. INSTALL V-BANK COVER SUB-ASSEMBLY . Refer to «INSTALLATION - Step 80»(ref-524246-S15625075792013012800000)

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1. REMOVE CRANKSHAFT POSITION SENSOR PROTECTOR Remove the 2 bolts and crankshaft position sensor protector.
2. REMOVE CRANKSHAFT POSITION SENSOR Disconnect the crankshaft position sensor connector. Remove the bolt and crankshaft position sensor.

1. INSTALL CRANKSHAFT POSITION SENSOR Install the crankshaft position sensor with the bolt. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Connect the crankshaft position sensor connector.
2. INSTALL CRANKSHAFT POSITION SENSOR PROTECTOR Install the crankshaft position sensor protector with the 2 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf)

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1. REMOVE V-BANK COVER SUB-ASSEMBLY . Refer to «REMOVAL - Step 15»(ref-524246-S36416482222013012800000)
2. REMOVE AIR CLEANER CAP AND HOSE . Refer to «REMOVAL - Step 23»(ref-524246-S36416482222013012800000)
3. REMOVE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
4. REMOVE AIR CLEANER CASE SUB-ASSEMBLY . Refer to «REMOVAL - Step 25»(ref-524246-S36416482222013012800000)
5. REMOVE IGNITION COIL ASSEMBLY for Bank 1: Remove the 4 ignition coils. Detach the clamp and disconnect the engine wire. Disconnect the 4 ignition coil connectors. Remove the 4 bolts and 4 ignition coils. for Bank 2: Remove the 4 ignition coils. Detach the 2 clamps and disconnect the engine wire. Disconnect the 4 ignition coil connectors. Detach the clamp and disconnect the engine wire. Remove the 2 bolts and disconnect the No. 4 water by-pass pipe. Remove the 4 bolts and 4 ignition coils.
6. REMOVE SPARK PLUG Using a 16 mm plug wrench, remove the 8 spark plugs.

1. INSTALL SPARK PLUG Using a 16 mm plug wrench, install the 8 spark plugs. Torque: 21 N*m (214 kgf*cm, 15 ft.*lbf)
2. INSTALL IGNITION COIL ASSEMBLY for Bank 1: Install the 4 ignition coils. Install the 4 ignition coils with the 4 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Connect the 4 ignition coil connectors. Attach the clamp and connect the engine wire. for Bank 2: Install the 4 ignition coils. Install the 4 ignition coils with the 4 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Connect the 4 ignition coil connectors. Attach the 2 clamps and connect the engine wire. Connect the No. 4 water by-pass pipe with the 2 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Attach the clamp and connect the engine wire.
3. INSTALL AIR CLEANER CASE SUB-ASSEMBLY . Refer to «INSTALLATION - Step 51»(ref-524246-S15625075792013012800000)
4. INSTALL AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
5. INSTALL AIR CLEANER CAP AND HOSE . Refer to «INSTALLATION - Step 53»(ref-524246-S15625075792013012800000)
6. INSTALL V-BANK COVER SUB-ASSEMBLY . Refer to «INSTALLATION - Step 80»(ref-524246-S15625075792013012800000)

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1. REMOVE LOWER FRONT BUMPER COVER . Refer to «REMOVAL - Step 6»(ref-524246-S36416482222013012800000)
2. REMOVE NO. 1 ENGINE UNDER COVER SUB-ASSEMBLY . Refer to «REMOVAL - Step 7»(ref-524246-S36416482222013012800000)
3. DRAIN ENGINE COOLANT . Refer to «REPLACEMENT - Step 5»(ref-524250-S32040211512013012800000)
4. REMOVE V-BANK COVER SUB-ASSEMBLY . Refer to «REMOVAL - Step 15»(ref-524246-S36416482222013012800000)
5. REMOVE ENGINE COOLANT TEMPERATURE SENSOR Disconnect the engine coolant temperature sensor connector. Remove the engine coolant temperature sensor. Remove the gasket from the engine coolant temperature sensor.

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1. INSPECT ENGINE COOLANT TEMPERATURE SENSOR TEXT IN ILLUSTRATION *1 Resistance *2 Temperature *3 Acceptable - - *a Component without harness connected (Engine Coolant Temperature Sensor) - - Partially immerse the sensor in water and warm up the water. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 - 2 Approx. 20°C (68°F) 2.32 k to 2.59 kohms 1 - 2 Approx. 80°C (176°F) 0.310 k to 0.326 kohms If the result is not as specified, replace the engine coolant temperature sensor. NOTE: When checking the sensor in water, keep the terminals dry. After the check, wipe the engine coolant temperature sensor dry. HINT: If the result is as specified, do not replace the engine coolant temperature sensor.

1. INSTALL ENGINE COOLANT TEMPERATURE SENSOR Install a new gasket to the engine coolant temperature sensor. Install the engine coolant temperature sensor. Torque: 20 N*m (200 kgf*cm, 14 ft.*lbf) Connect the engine coolant temperature sensor connector.
2. ADD ENGINE COOLANT . Refer to «REPLACEMENT - Step 6»(ref-524250-S32040211512013012800000)
3. INSPECT FOR COOLANT LEAK . Refer to «ON-VEHICLE INSPECTION - Step 1»(ref-524249-S11423921442013012800000)
4. INSTALL V-BANK COVER SUB-ASSEMBLY . Refer to «INSTALLATION - Step 80»(ref-524246-S15625075792013012800000)
5. INSTALL NO. 1 ENGINE UNDER COVER SUB-ASSEMBLY . Refer to «INSTALLATION - Step 88»(ref-524246-S15625075792013012800000)
6. INSTALL LOWER FRONT BUMPER COVER . Refer to «INSTALLATION - Step 89»(ref-524246-S15625075792013012800000)

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1. REMOVE EGR COOLER ASSEMBLY Remove the EGR cooler. Refer to «REMOVAL»(ref-524251-S40450976452013012800000) .
2. REMOVE SEPARATOR CASE Remove the 4 bolts and separator case.
3. REMOVE KNOCK SENSOR Disconnect the 4 knock sensor connectors. Remove the 4 bolts and 4 knock sensors.

1. INSTALL MANIFOLD ABSOLUTE PRESSURE SENSOR Install a new O-ring to the manifold absolute pressure sensor. Install the manifold absolute pressure sensor with the bolt. Torque: 9.0 N*m (92 kgf*cm, 80 in.*lbf) Connect the manifold absolute pressure sensor connector.
2. INSTALL V-BANK COVER SUB-ASSEMBLY . Refer to «INSTALLATION - Step 80»(ref-524246-S15625075792013012800000)

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1. REMOVE EXHAUST MANIFOLD ASSEMBLY Remove the exhaust manifold. Refer to «REMOVAL»(ref-524275-S11014308002013012800000) .
2. REMOVE AIR FUEL RATIO SENSOR (for Bank 1 Sensor 1) Using SST, remove the air fuel ratio sensor from the exhaust manifold LH. SST: 09224-00010
3. REMOVE AIR FUEL RATIO SENSOR (for Bank 2 Sensor 1) Using SST, remove the air fuel ratio sensor from the exhaust manifold RH. SST: 09224-00010

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1. INSPECT AIR FUEL RATIO SENSOR Measure the resistance according to the value(s) in the table below. Standard Resistance (for Bank 1) Tester Connection Condition Specified Condition 1 (HA1A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 ohms 1 (HA1A) - 4 (A1A-) Always 10 kohms or higher Standard Resistance (for Bank 2) Tester Connection Condition Specified Condition 1 (HA2A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 ohms 1 (HA2A) - 4 (A2A-) Always 10 kohms or higher TEXT IN ILLUSTRATION *A for Bank 1 *B for Bank 2 *a Component without harness connected (Air Fuel Ratio Sensor) If the result is not as specified, replace the air fuel ratio sensor.

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1. INSTALL AIR FUEL RATIO SENSOR (for Bank 2 Sensor 1) Temporarily install the air fuel ratio sensor to the exhaust manifold RH by hand. Using SST, tighten the air fuel ratio sensor. SST: 09224-00010 without SST Torque: 44 N*m (449 kgf*cm, 32 ft.*lbf) with SST Torque: 40 N*m (408 kgf*cm, 30 ft.*lbf) TEXT IN ILLUSTRATION *1 Fulcrum Length HINT: Use a torque wrench with a fulcrum length of 30 cm (11.8 in.). When using a torque wrench with a fulcrum length that is not 30 cm (11.8 in.), calculate the torque specification for the torque wrench and SST based on the "without SST" torque specification. Refer to «PRECAUTION»(ref-524109-S11104823482013012800000) . Make sure SST and the wrench are connected in a straight line.
2. INSTALL AIR FUEL RATIO SENSOR (for Bank 1 Sensor 1) Temporarily install the air fuel ratio sensor to the exhaust manifold LH by hand. Using SST, tighten the air fuel ratio sensor. SST: 09224-00010 without SST Torque: 44 N*m (449 kgf*cm, 32 ft.*lbf) with SST Torque: 40 N*m (408 kgf*cm, 30 ft.*lbf) TEXT IN ILLUSTRATION *1 Fulcrum Length HINT: Use a torque wrench with a fulcrum length of 30 cm (11.8 in.). When using a torque wrench with a fulcrum length that is not 30 cm (11.8 in.), calculate the torque specification for the torque wrench and SST based on the "without SST" torque specification. Refer to «PRECAUTION»(ref-524109-S11104823482013012800000) . Make sure SST and the wrench are connected in a straight line.
3. INSTALL EXHAUST MANIFOLD ASSEMBLY Install the exhaust manifold. Refer to «INSTALLATION»(ref-524275-S30956171002013012800000) .
4. INSPECT FOR EXHAUST GAS LEAK . Refer to «INSTALLATION - Step 17»(ref-524275-S29428633372013012800000)

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REMOVAL

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1. REMOVE HEATED OXYGEN SENSOR (for Bank 1 Sensor 2) Disconnect the heated oxygen sensor connector. Using SST, remove the heated oxygen sensor from the front No. 2 exhaust pipe. SST: 09224-00010
2. REMOVE HEATED OXYGEN SENSOR (for Bank 2 Sensor 2) Detach the 2 clamps and disconnect the heated oxygen sensor connector. Using SST, remove the heated oxygen sensor from the front exhaust pipe. SST: 09224-00010

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1. INSPECT HEATED OXYGEN SENSOR Measure the resistance according to the value(s) in the table below. Standard Resistance (for Bank 1) Tester Connection Condition Specified Condition 1 (HT1B) - 2 (+B) 20°C (68°F) 11 to 16 ohms 1 (HT1B) - 4 (E1) Always 10 kohms or higher Standard Resistance (for Bank 2) Tester Connection Condition Specified Condition 1 (HT2B) - 2 (+B) 20°C (68°F) 11 to 16 ohms 1 (HT2B) - 4 (E1) Always 10 kohms or higher TEXT IN ILLUSTRATION *A for Bank 1 *B for Bank 2 *a Component without harness connected (Heated Oxygen Sensor) If the result is not as specified, replace the heated oxygen sensor.

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1. INSTALL HEATED OXYGEN SENSOR (for Bank 2 Sensor 2) Temporarily install the sensor to the front exhaust pipe by hand. Using SST, tighten the heated oxygen sensor. SST: 09224-00010 without SST Torque: 44 N*m (449 kgf*cm, 32 ft.*lbf) with SST Torque: 40 N*m (408 kgf*cm, 30 ft.*lbf) TEXT IN ILLUSTRATION *1 Fulcrum Length HINT: Use a torque wrench with a fulcrum length of 30 cm (11.8 in.). When using a torque wrench with a fulcrum length that is not 30 cm (11.8 in.), calculate the torque specification for the torque wrench and SST based on the "without SST" torque specification. Refer to «PRECAUTION»(ref-524109-S11104823482013012800000) . Make sure SST and the wrench are connected in a straight line. Attach the 2 clamps and connect the heated oxygen sensor connector.
2. INSTALL HEATED OXYGEN SENSOR (for Bank 1 Sensor 2) Temporarily install the sensor to the front No. 2 exhaust pipe by hand. Using SST, tighten the heated oxygen sensor. SST: 09224-00010 without SST Torque: 44 N*m (449 kgf*cm, 32 ft.*lbf) with SST Torque: 40 N*m (408 kgf*cm, 30 ft.*lbf) TEXT IN ILLUSTRATION *1 Fulcrum Length HINT: Use a torque wrench with a fulcrum length of 30 cm (11.8 in.). When using a torque wrench with a fulcrum length that is not 30 cm (11.8 in.), calculate the torque specification for the torque wrench and SST based on the "without SST" torque specification. Refer to «PRECAUTION»(ref-524109-S11104823482013012800000) . Make sure SST and the wrench are connected in a straight line. Connect the heated oxygen sensor connector.
3. INSPECT FOR EXHAUST GAS LEAK . Refer to «INSTALLATION - Step 17»(ref-524275-S29428633372013012800000)

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