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2006 lexus gx470 service repair manual
1.
2007 ENGINE Engine Mechanical
- GX 470 ENGINE ON-VEHICLE INSPECTION 1. INSPECT ENGINE COOLANT HINT: (See ON-VEHICLE INSPECTION ) 2. INSPECT ENGINE OIL HINT: (See ON-VEHICLE INSPECTION ) 3. INSPECT BATTERY SPECIFIC GRAVITY HINT: (See ON-VEHICLE INSPECTION ) 4. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY 5. INSPECT FAN AND GENERATOR V BELT HINT: As the belt tensioner coordinates belt tension automatically by its mechanism, you do not need to adjust it by yourself. Fig. 1: Identifying Indicator Mark On Automatic Tensioner Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 2007 Lexus GX 470 2007 ENGINE Engine Mechanical - GX 470 2007 Lexus GX 470 2007 ENGINE Engine Mechanical - GX 470 Microsoft Sunday, August 23, 2009 8:03:02 AM Page 1 © 2005 Mitchell Repair Information Company, LLC. Microsoft Sunday, August 23, 2009 8:03:11 AM Page 1 © 2005 Mitchell Repair Information Company, LLC.
2.
a. Check that
the indicator mark on the automatic tensioner is within the A range. b. When the mark is out of the standard range, replace the V belt with a new one. 6. INSPECT V-RIBBED BELT TENSIONER ASSEMBLY (See INSPECTION ) 7. WARM UP ENGINE 8. INSPECT IGNITION TIMING a. When using the intelligent tester or OBD II scan tool: Fig. 2: Connecting Intelligent Tester To DLC3 Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 1. Connect the intelligent tester or OBD II scan tool to the DLC3. HINT: Refer to the intelligent tester or OBD II scan tool operator's manual for further details. Ignition timing: 5 to 15° BTDC at idle (Transmission in neutral) 2. Disconnect the intelligent tester or OBD II scan tool from the DLC3. b. When not using the intelligent tester or OBD II scan tool: 1. Remove the V-bank cover. 2007 Lexus GX 470 2007 ENGINE Engine Mechanical - GX 470 Microsoft Sunday, August 23, 2009 8:03:03 AM Page 2 © 2005 Mitchell Repair Information Company, LLC.
3.
Fig. 3: Identifying
Ignition Coil Connector Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 2. Connect the tester probe of a timing light to the wire of the ignition coil connector for the No. 1 cylinder. Fig. 4: Connecting Tachometer Probe To Terminal TAC Of DLC3 Using SST Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 3. Using SST, connect the tachometer probe to terminal TAC of the DLC3. SST 09843-18030 Fig. 5: Connecting Terminals TC & CG Of DLC3 Using SST Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 4. Using SST, connect terminals TC and CG of the DLC3. SST 09843-18040 2007 Lexus GX 470 2007 ENGINE Engine Mechanical - GX 470 Microsoft Sunday, August 23, 2009 8:03:03 AM Page 3 © 2005 Mitchell Repair Information Company, LLC.
4.
Fig. 6: Checking
Ignition Timing Using Timing Belt Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 5. Using the timing light, check the ignition timing. Ignition timing: 5 to 15° BTDC at idle (Transmission in neutral) 6. Remove the SST from the DLC3. 7. Disconnect the timing light from the engine. 8. Install the V-bank cover. 9. INSPECT ENGINE IDLE SPEED a. When using the intelligent tester or OBD II scan tool: Fig. 7: Connecting Intelligent Tester To DLC3 Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 1. Connect the intelligent tester or OBD II scan tool to the DLC3. HINT: Refer to the intelligent tester or OBD II scan tool operator's manual for further details. 2. Run the engine at 2,500 rpm for approx. 90 seconds. 2007 Lexus GX 470 2007 ENGINE Engine Mechanical - GX 470 Microsoft Sunday, August 23, 2009 8:03:03 AM Page 4 © 2005 Mitchell Repair Information Company, LLC.
5.
3. Check the
idle speed. Idle speed: 700 +- 50 rpm If the idle speed is not as specified, check the air intake system. 4. Disconnect the intelligent tester or OBD II scan tool from the DLC3. b. When not using the intelligent tester or OBD II scan tool: Fig. 8: Connecting Tachometer Probe To Terminal TAC Of DLC3 Using SST Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 1. Using SST, connect the tachometer probe to terminal TAC of the DLC3. SST 09843-18030 HINT: Refer to the intelligent tester operator's manual for further details. 2. Run the engine at 2,500 rpm for approx. 90 seconds. 3. Check the idle speed. Idle speed: 700 +- 50 rpm 4. Remove the SST from the DLC3. 5. Disconnect the tachometer from the DLC3. 10. INSPECT COMPRESSION a. Remove the V-bank cover sub-assembly. b. Remove the air cleaner hose assembly. 2007 Lexus GX 470 2007 ENGINE Engine Mechanical - GX 470 Microsoft Sunday, August 23, 2009 8:03:03 AM Page 5 © 2005 Mitchell Repair Information Company, LLC.
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c. Disconnect the
throttle control motor connector. d. Remove the 8 ignition coils. e. Remove the 8 spark plugs. f. Disconnect the 8 injector connectors. g. Inspect the cylinder compression pressure. Fig. 9: Measuring Compression Pressure Of Cylinder Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 1. Insert a compression gauge into the spark plug hole (Procedure "A"). 2. Fully open the throttle forcibly by hand. 3. While cranking the engine, measure the compression pressure (Procedure "B"). HINT: Always use a fully charged battery to obtain an engine speed of 250 rpm or more. 4. Repeat procedures "A" to "B" for each cylinder. 5. If the cylinder compression in one or more cylinders is low, pour a small amount of engine NOTE: This measurement must be done as quickly as possible. Compression pressure: 1,373 kPa (14.0 kgf/cm2 , 199 psi) or more Minimum pressure: 1,030 kPa (10.5 kgf/cm2 , 149 psi) Difference between each cylinder: 98 kPa (1.0 kgf/cm2 , 14 psi) or less 2007 Lexus GX 470 2007 ENGINE Engine Mechanical - GX 470 Microsoft Sunday, August 23, 2009 8:03:03 AM Page 6 © 2005 Mitchell Repair Information Company, LLC.
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oil into the
cylinder through the spark plug hole and repeat procedures "A" to "B" for the cylinders with low compression. If adding oil helps the compression, the piston rings and/or cylinder bore may be worn or damaged. If pressure stays low, a valve may be sticking, seating is improper, or there may be leakage past the gasket. h. Connect the 8 injector connectors. i. Install the 8 spark plugs. j. Install the 8 ignition coils. k. Connect the throttle control motor connector. l. Install the air cleaner hose assembly. m. Install the V-bank cover sub-assembly. 11. INSPECT CO/HC HINT: This check is used only to determine whether or not the idle CO/HC complies with regulations. a. Start the engine. b. Sustain the engine speed at 2,500 rpm for approx. 180 seconds. Fig. 10: Inserting CO/HC Meter Testing Probe Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. c. Insert the CO/HC meter testing probe at least 40 cm (1.3 ft) into the tailpipe during idling. d. Immediately check CO/HC concentration at idle and/or 2,500 rpm. HINT: When performing the 2 mode (2,500 rpm and idle) test, follow the measurement order prescribed by the applicable local regulations. If the CO/HC concentration does not comply with the regulations, troubleshoot in the order given below. 2007 Lexus GX 470 2007 ENGINE Engine Mechanical - GX 470 Microsoft Sunday, August 23, 2009 8:03:03 AM Page 7 © 2005 Mitchell Repair Information Company, LLC.
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1. Check the
heated oxygen sensor operation (See DTC P0136 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 2) and DTC P2195 OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1) ). 2. See the table below for possible causes, then inspect and correct the applicable causes if necessary. PROBLEM SYMPTOM TABLE DRIVE BELT COMPONENTS CO HC Symptom Cause Normal High Rough idle 1. Faulty ignitions: Incorrect timing Fouled, shorted or improperly gapped plugs 2. Incorrect valve clearance 3. Leaky intake and exhaust valves 4. Leaky cylinder Low High Rough idle (Fluctuating HC reading) 1. Vacuum leaks: PCV hose Intake manifold Throttle body 2. Lean mixture causing misfire High High Rough idle Black smoke from exhaust) 1. Restricted air filter 2. Faulty SFI system: Faulty pressure regulator Defective ECT sensor Faulty ECM Faulty injector Faulty throttle position sensor Faulty MAF sensor 2007 Lexus GX 470 2007 ENGINE Engine Mechanical - GX 470 Microsoft Sunday, August 23, 2009 8:03:03 AM Page 8 © 2005 Mitchell Repair Information Company, LLC.
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Fig. 11: Identifying
Drive Belt Replacement Components Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. REMOVAL 1. REMOVE FAN AND GENERATOR V BELT 2007 Lexus GX 470 2007 ENGINE Engine Mechanical - GX 470 Microsoft Sunday, August 23, 2009 8:03:03 AM Page 9 © 2005 Mitchell Repair Information Company, LLC.
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Fig. 12: Loosening
Belt Tension Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. a. Loosen the belt tension by turning the belt tensioner counterclockwise, and then remove the fan and generator V belt. HINT: The pulley bolt for the belt tensioner has left-hand thread. INSPECTION 1. INSPECT V-RIBBED BELT TENSIONER ASSEMBLY a. Remove the V belt from the tensioner pulley. Then check that nothing gets caught the tensioner by turning it clockwise and counterclockwise. b. When a malfunction exists, replace the tensioner. INSTALLATION 1. INSTALL FAN AND GENERATOR V BELT Fig. 13: Identifying V Belt Position Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. a. Set the V belt onto every parts except the No. 2 idler pulley. b. Loosen the V belt by turning the belt tensioner counterclockwise. 2007 Lexus GX 470 2007 ENGINE Engine Mechanical - GX 470 Microsoft Sunday, August 23, 2009 8:03:03 AM Page 10 © 2005 Mitchell Repair Information Company, LLC.
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c. Set the
V belt to the No. 2 idler pulley. Fig. 14: Identifying Indicator Mark On Automatic Tensioner Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. d. After installing a new belt, check that the mark is within the B range. VALVE CLEARANCE ADJUSTMENT 1. DRAIN ENGINE COOLANT (See REPLACEMENT ) 2. SEPARATE BATTERY NEGATIVE TERMINAL 3. REMOVE V-BANK COVER SUB-ASSEMBLY 4. REMOVE ENGINE ROOM COVER SIDE 5. REMOVE ENGINE ROOM SIDE COVER LH 6. REMOVE AIR CLEANER HOSE ASSEMBLY 7. REMOVE RADIATOR SUPPORT SEAL UPPER 8. REMOVE FAN AND GENERATOR V BELT (See REMOVAL ) 9. REMOVE OIL COOLER PIPE (See REMOVAL ) 10. REMOVE IGNITION COIL ASSEMBLY 11. REMOVE NO. 3 TIMING BELT COVER SUB-ASSEMBLY LH (See REMOVAL ) 12. REMOVE NO. 2 TIMING CHAIN OR BELT COVER (See REMOVAL ) 13. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY a. Remove the 9 bolts, 9 seal washers and cylinder head cover. 14. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY LH a. Disconnect the PCV hose. b. Remove the 9 bolts, 9 seal washers and cylinder head cover. 15. SET NO. 1 CYLINDER TO TDC/COMPRESSION 2007 Lexus GX 470 2007 ENGINE Engine Mechanical - GX 470 Microsoft Sunday, August 23, 2009 8:03:03 AM Page 11 © 2005 Mitchell Repair Information Company, LLC.
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Fig. 15: Turning
Crankshaft Pulley Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. a. Turn the crankshaft pulley to align its notch with timing mark "0" of the No. 1 timing belt cover. Fig. 16: Identifying Timing Marks Of Camshaft Timing Pulleys & Timing Belt Rear Plates Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. b. Check that the timing marks of the camshaft timing pulleys and timing belt rear plates are aligned. If not, turn the crankshaft 1 complete revolution (360°) and align the marks as above. 16. INSPECT VALVE CLEARANCE 2007 Lexus GX 470 2007 ENGINE Engine Mechanical - GX 470 Microsoft Sunday, August 23, 2009 8:03:03 AM Page 12 © 2005 Mitchell Repair Information Company, LLC.
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Fig. 17: Measuring
Clearance Between Valve Lifter & Camshaft Using Feeler Gauge Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. a. Check only the valves indicated. 1. Using a feeler gauge, measure the clearance between the valve lifter and camshaft. 2. Record the out-of-specification valve clearance measurements. They will be used later to determine the required replacement adjusting shim. Valve clearance (Cold): Intake: 0.15 to 0.25 mm (0.006 to 0.010 in.) Exhaust: 0.25 to 0.35 mm (0.010 to 0.014 in.) b. Turn the crankshaft 1 complete revolution (360°) and align the camshaft timing marks. c. Check only the valves. Measure the valve clearance. 17. ADJUST VALVE CLEARANCE 2007 Lexus GX 470 2007 ENGINE Engine Mechanical - GX 470 Microsoft Sunday, August 23, 2009 8:03:03 AM Page 13 © 2005 Mitchell Repair Information Company, LLC.
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Fig. 18: Measuring
Clearance Between Valve Lifter & Camshaft Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. a. Remove the timing belt (See REMOVAL ). b. Remove the camshafts (RH Bank) (See REMOVAL ). c. Remove the camshafts (LH Bank) (See REMOVAL ). d. Remove the valve lifter and adjusting shim. e. Determine the replacement adjusting shim size according to the formula or tables. Fig. 19: Measuring Thickness Of Removed Shim Using Micrometer Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 1. Using a micrometer, measure the thickness of the removed shim. NOTE: Be careful not to drop the adjusting shim into the cylinder head. 2007 Lexus GX 470 2007 ENGINE Engine Mechanical - GX 470 Microsoft Sunday, August 23, 2009 8:03:03 AM Page 14 © 2005 Mitchell Repair Information Company, LLC.
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2. Calculate the
thickness of a new shim so that the valve clearance comes within the specified value. T: Thickness of removed shim A: Measured valve clearance N: Thickness of new shim Intake: N = T + (A - 0.20 mm (0.008 in.)) Exhaust: N = T + (A - 0.30 mm (0.012 in.)) 3. Select a new shim with a thickness as close as possible to the calculated value. HINT: Shims are available in 41 increments of 0.020 mm (0.0008 in.), from 2.00 mm (0.0787 in.) to 2.80 mm (0.1102 in.). Refer to the new adjusting shim thickness tables below. 2007 Lexus GX 470 2007 ENGINE Engine Mechanical - GX 470 Microsoft Sunday, August 23, 2009 8:03:03 AM Page 15 © 2005 Mitchell Repair Information Company, LLC.
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