Engine Mechanical: Overview Lexus LS IV

Scheme 1

Scheme 2

Scheme 3

Scheme 4

Scheme 5

Scheme 6

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

Scheme 14

Scheme 15

Scheme 16

Scheme 17

Scheme 18

Scheme 19

Scheme 20

Scheme 21

Scheme 22

Scheme 23

Scheme 24

Scheme 25

Scheme 26

Scheme 27

Scheme 28

Scheme 29

Scheme 30

Scheme 31

Scheme 32

Scheme 33

1. CHECK V-RIBBED BELT Check the belt for wear, cracks or other signs of damage. If any of the following defects is found, replace the V-ribbed belt. HINT: The belt is cracked. The belt is worn out to the extent that the cords are exposed. The belt has chunks missing from the ribs. Check that the belt fits properly in the ribbed grooves. HINT: Check with your hand to confirm that the belt has not slipped out of the groove on the bottom to the pulley. If it has slipped out, replace the V-ribbed belt. Install a new V-ribbed belt correctly.
2. INSPECT V-RIBBED BELT TENSIONER ASSEMBLY Check that nothing gets caught in the tensioner by turning it clockwise and counterclockwise. If a malfunction exists, replace the tensioner.
3. INSPECT VALVE LASH ADJUSTER NOISE Rev up the engine several times. Check that the engine does not emit unusual noises. If unusual noises occur, warm up the engine and idle it for over 30 minutes. Then perform the inspection above again. If any defects or problems are found during the inspection above, perform a lash adjuster inspection (see «INSPECTION» ).
4. INSPECT IGNITION TIMING Warm up and stop the engine. HINT: A warmed up engine should have an engine coolant temperature of over 80°C (176°F) and an engine oil temperature of 60°C (140°F), and the engine rpm should be stabilized. When using the Techstream: Connect the Techstream to the DLC3. Start the engine and idle it. Turn the tester ON. Enter the following menus: Powertrain/Engine and ECT/Data List/Primary/IGN Advance. HINT: Refer to the Techstream operator's manual for further details. Standard ignition timing: 8 to 18° BTDC @ idle When not using the Techstream: Remove the V-bank cover. Remove the 5 clips and air cleaner inlet cover. Remove the 4 clips and engine room side cover LH. Remove the 2 bolts and No. 1 air cleaner inlet. Disconnect the air cleaner cap (for Bank 1). Remove the 2 nuts and air cleaner case (for Bank 1). Connect the tester probe of a timing light to the wire of the ignition connector for No. 1 cylinder. NOTE: Use a timing light that detects primary signals. Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3. SST 09843-18040 NOTE: Confirm the terminal numbers before connecting them. Connecting the wrong terminals can damage the engine. When checking the ignition timing, the transmission should be in neutral. Using a timing light, check the ignition timing. Standard ignition timing: 8 to 12 BTDC @ idle Remove SST from the DLC3. Check the ignition timing. Standard ignition timing: 8 to 18° BTDC @ idle Check that the ignition timing advances immediately when the engine speed is increased. Disconnect the timing light from the engine. Install the air cleaner case (for Bank 1) with the 2 nuts. Connect the air cleaner cap (for Bank 1). Install the No. 1 air cleaner inlet with the 2 bolts. Install the engine room side cover LH with the 4 clips. Install the air cleaner inlet cover with the 5 clips. Install the V-bank cover.
5. INSPECT ENGINE IDLE SPEED Warm up and stop the engine. HINT: A warmed up engine should have an engine coolant temperature of over 80°C (176°F) and an engine oil temperature of 60°C (140°F), and the engine rpm should be stabilized. When using the Techstream: Connect the Techstream to the DLC3. NOTE: Switch off all accessories and the A/C before connecting the Techstream. Race the engine at 2500 rpm for approximately 90 seconds. Turn the tester ON. Enter the following menus: Powertrain/Engine and ECT/Data List/Primary/Engine Speed. Standard idle speed: 700 to 800 rpm NOTE: When checking the idle speed, the transmission should be in neutral. HINT: Refer to the Techstream operator's manual for further details. If the idle speed is not as specified, check the air intake system. Disconnect the Techstream from the DLC3. When not using the Techstream: Using SST, connect a tachometer probe to terminal 9 (TAC) of the DLC3. SST 09843-18040 NOTE: Confirm the terminal numbers before connecting them. Connecting the wrong terminals can damage the engine. Race the engine at 2500 rpm for approximately 90 seconds. Check the idle speed. Idle speed (Transmission neutral position): 700 to 800 rpm If the speed is not as specified, check the air intake system. Disconnect the tachometer from the DLC3.
6. INSPECT COMPRESSION Warm up and stop the engine. HINT: A warmed up engine should have an engine coolant temperature of over 80°C (176°F) and an engine oil temperature of 60°C (140°F), and the engine rpm should be stabilized. Remove the V-bank cover. Remove the 5 clips and air cleaner inlet cover. Remove the 8 clips and 2 engine room side covers. Remove the 2 bolts and No. 1 air cleaner inlet. Remove the 4 nuts and 2 air cleaner assemblies. Disconnect the cable from the negative (-) battery terminal (see «REMOVAL» ). Remove the battery and tray. Remove the 2 bolts, nut and skid control ECU. Remove the bolt, 2 nuts and skid control ECU bracket. Disconnect the 8 ignition coil connectors. Disconnect the 2 injector connectors as shown in the illustration. Remove the 8 bolts and 8 ignition coils. Remove the 8 spark plugs. Disconnect the 4 injector driver connectors as shown in the illustration. Cylinder under the battery installation position: Inspect the compression pressure. Insert a compression gauge into the spark plug hole. Install the battery and tray. Connect the cable to the negative (-) battery terminal. Depress and hold the brake pedal, and turn the engine switch on (IG). Then check the compression pressure. HINT: Always use a fully charged battery to obtain engine speed of 200 rpm or more. NOTE: The measurement must be done as quickly as possible. Standard compression pressure: 1400 kPa (14.2 kgf/cm 2, 203 psi) or higher Minimum pressure: 980 kPa (9.9 kgf/cm 2, 142 psi) Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal (see «REMOVAL» ). Remove the battery and tray. Remove the compression gauge. Cylinder other than cylinder under the battery installation position: Inspect the compression pressure. Insert a compression gauge into the spark plug hole. Install the battery and tray. Connect the cable to the negative (-) battery terminal. Depress and hold the brake pedal, and turn the engine switch on (IG). Then check the compression pressure. HINT: Always use a fully charged battery to obtain engine speed of 200 rpm or more. NOTE: The measurement must be done as quickly as possible. Standard compression pressure: 1400 kPa (14.2 kgf/cm 2, 203 psi) or higher Minimum pressure: 980 kPa (9.9 kgf/cm 2, 142 psi) Remove the compression gauge. Perform the inspection above for each cylinder. Check the pressure difference between each compression pressure. Pressure difference: 100 kPa (1.0 kgf/cm 2, 14.5 psi) or less If the cylinder compression is low in one or more cylinders, pour a small amount of engine oil into the cylinder with low compression through its spark plug hole. Then inspect the cylinder compression pressure again. HINT: If adding oil helps boost the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged. If pressure stays low, a valve may be stuck or seated improperly, or there may be leakage in the gasket. Disconnect the cable from the negative (-) battery terminal (see «REMOVAL» ). Remove the battery and tray. Connect the 4 injector driver connectors as shown in the illustration. Install the 8 spark plugs. Install the 8 ignition coils with the 8 bolts. Disconnect the 8 ignition coil connectors. Connect the 2 injector connectors as shown in the illustration. Install the skid control ECU bracket with the bolt and 2 nuts. Install the skid control ECU with the 2 bolts and nut. Install the battery and tray. Connect the cable to the negative (-) battery terminal. Install the 2 air cleaner assemblies with the 4 nuts. Install the No. 1 air cleaner inlet with the 2 bolts. Install the 2 engine room side covers with the 8 clips. Install the air cleaner inlet cover with the 5 clips. Install the V-bank cover. Perform initialization (see «INITIALIZATION» ). NOTE: Certain systems need to be initialized after reconnecting the cable to the negative (-) battery terminal. Clear the DTCs (see «DTC CHECK/CLEAR»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) ).
7. INSPECT CO/HC HINT: This check determines whether or not the idle CO/HC complies with regulations. Start the engine. Keep the engine speed at 2500 rpm for approximately 180 seconds. Insert the CO/HC meter testing probe at least 40 cm (1.3 ft.) into the tailpipe during idling. Immediately check CO/HC concentration at idle and 2500 rpm. HINT: When performing the 2 mode (2500 rpm and idle) test, follow the measurement order prescribed by the applicable local regulations. If the CO/HC concentration does not comply with regulations, troubleshoot in the order given below. Check the A/F sensor and heated oxygen sensor operation. See the table below for possible causes, and then inspect and correct the applicable causes if necessary. SYMPTOM CHART CO HC Symptom Causes Normal High Rough idle Faulty ignitions Incorrect timing Plugs are contaminated, shorted, or gaps are defective. Leaky intake and exhaust valves Leaky cylinder Low High Rough idle (Fluctuating HC reading) Vacuum leaks PCV hose Intake manifold Throttle body Lean mixture causing misfire High High Rough idle (Black smoke from exhaust) Restricted air filter Faulty SFI system Faulty pressure Defective ECT sensor Faulty ECM Faulty injector Faulty throttle position sensor Faulty MAF sensor

Scheme 34

Scheme 35

Scheme 36

Scheme 37

Scheme 38

Scheme 39

Scheme 40

Scheme 41

Scheme 42

Scheme 43

Scheme 44

Scheme 45

Scheme 46

Scheme 47

Scheme 48

Scheme 49

Scheme 50

Scheme 51

Scheme 52

Scheme 53

Scheme 54

Scheme 55

Scheme 56

Scheme 57

Scheme 58

Scheme 59

Scheme 60

Scheme 61

Scheme 62

Scheme 63

Scheme 64

Scheme 65

Scheme 66

Scheme 67

Scheme 68

Scheme 69

Scheme 70

1. PLACE FRONT WHEELS FACING STRAIGHT AHEAD
2. DISCHARGE FUEL SYSTEM PRESSURE (See «PRECAUTION» )
3. REMOVE COWL TOP VENTILATOR LOUVER (See «REMOVAL» )
4. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation. NOTE: After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
5. REMOVE V-BANK COVER SUB-ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
6. REMOVE AIR CLEANER INLET COVER SUB-ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
7. REMOVE ENGINE ROOM SIDE COVER RH Remove the 4 clips and engine room side cover.
8. REMOVE ENGINE ROOM SIDE COVER LH Remove the 4 clips and engine room side cover.
9. REMOVE NO. 1 ENGINE UNDER COVER (See «COOLANT»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
10. REMOVE NO. 2 ENGINE UNDER COVER Remove the 8 bolts and under cover.
11. REMOVE FRONT SUSPENSION MEMBER PROTECTOR LOWER Remove the 8 bolts and suspension member protector.
12. DRAIN ENGINE OIL (See «REPLACEMENT» )
13. DRAIN ENGINE COOLANT (See «COOLANT»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
14. DISCONNECT NO. 1 OIL COOLER INLET HOSE Using needle-nose pliers, grip the claws of the clip and slide the clip to disconnect the oil cooler hose. HINT: Place a container under the connection before disconnecting the oil cooler hose because oil in the hose may spill out.
15. DISCONNECT NO. 1 OIL COOLER OUTLET HOSE Using needle-nose pliers, grip the claws of the clip and slide the clip to disconnect the oil cooler hose. HINT: Place a container under the connection before disconnecting the oil cooler hose because oil in the hose may spill out.
16. REMOVE FRONT WHEEL
17. REMOVE FRONT BUMPER COVER Remove the front bumper cover (see «REMOVAL» ).
18. REMOVE FRONT SUSPENSION CROSSMEMBER LOWER Remove the 6 bolts, 4 nuts and suspension crossmember lower.
19. REMOVE NO. 1 AIR CLEANER INLET (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
20. REMOVE INTAKE AIR CONNECTOR PIPE (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
21. REMOVE V-RIBBED BELT (See «REMOVAL» )
22. REMOVE AIR CLEANER ASSEMBLY LH (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake) )
23. REMOVE AIR CLEANER ASSEMBLY RH (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake) )
24. DISCONNECT NO. 1 RADIATOR HOSE
25. DISCONNECT NO. 2 RADIATOR HOSE
26. REMOVE ENGINE ROOM ECU OUTLET DUCT Remove the outlet duct.
27. DISCONNECT NO. 3 FUEL HOSE (See «REMOVAL» )
28. DISCONNECT NO. 1 FUEL PIPE SUB-ASSEMBLY (See «REMOVAL» )
29. DISCONNECT HOSES AND CONNECTORS Remove the ECM box cover (upper). Disconnect the 3 ECT connectors and 4 ECM connectors from the ECM box. Detach the clamp and disconnect the cooler compressor connector. Detach the clamp and disconnect the 3 connectors with front controller. Remove the bolt and disconnect the ground wire. Remove the 2 nuts and disconnect the wires with No. 1 engine room junction block. Disconnect the 2 heater hoses. Disconnect the purge line hose.
30. REMOVE FRONT EXHAUST PIPE ASSEMBLY Remove the front exhaust pipe (see «REMOVAL» ).
31. REMOVE NO. 1 EXHAUST PIPE SUPPORT BRACKET SUB-ASSEMBLY (See «REMOVAL» )
32. REMOVE PROPELLER WITH CENTER BEARING SHAFT ASSEMBLY Remove the propeller shaft (see «REMOVAL»(/lexus/ls/iv-2006-2012/remont/driveshaft-universal-joints/#propeller-shaft) ).
33. REMOVE FRONT STABILIZER BAR Remove the front stabilizer bar (see «REMOVAL» ).
34. REMOVE FRONT SUSPENSION MEMBER REINFORCEMENT RH (See «REMOVAL» )
35. REMOVE FRONT SUSPENSION MEMBER REINFORCEMENT LH (See «REMOVAL» )
36. REMOVE STEERING SLIDING YOKE WITH SHAFT SUB-ASSEMBLY (w/ VGRS) (See «REMOVAL» )
37. REMOVE STEERING SLIDING YOKE WITH SHAFT SUB-ASSEMBLY (w/o VGRS) (See «REMOVAL» )
38. REMOVE NO. 2 STEERING INTERMEDIATE SHAFT ASSEMBLY (w/ VGRS) (See «REMOVAL» )
39. REMOVE NO. 2 STEERING INTERMEDIATE SHAFT ASSEMBLY (w/o VGRS) (See «REMOVAL» )
40. REMOVE POWER STEERING LINK ASSEMBLY (w/ VGRS) (See «REMOVAL» )
41. REMOVE POWER STEERING LINK ASSEMBLY (w/o VGRS) (See «REMOVAL» )
42. REMOVE NO. 2 EXHAUST MANIFOLD HEAT INSULATOR (See «REMOVAL» )
43. REMOVE EXHAUST MANIFOLD SUB-ASSEMBLY (for Bank 1) (See «REMOVAL» )
44. DISCONNECT COOLER COMPRESSOR ASSEMBLY Remove the 2 bolts, 2 nuts and 2 stud bolts and disconnect the cooler compressor. HINT: It is not necessary to completely remove the compressor. With the hoses connected to the compressor, hang the compressor on the vehicle body with a rope.
45. DISCONNECT FRONT NO. 2 LOWER SUSPENSION ARM ASSEMBLY Disconnect the front No. 2 lower suspension arm (see «REMOVAL» ).
46. DISCONNECT FLOOR SHIFT GEAR SHIFTING ROD SUB-ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/automatic-trans/#automatic-transaxle-aa80e) )
47. REMOVE ENGINE AND TRANSMISSION Place a mark (with spray, etc.) over the front right vehicle side attachment area of the crossmember, which is indicated in the illustration. Place a mark (with spray, etc.) over the front left vehicle side attachment area of the crossmember. Set an engine lifter underneath the engine. HINT: Place the engine on wooden blocks or an equivalent so that the engine is level. Remove the 4 engine rear mounting member's bolts. Remove the 4 bolts shown in the illustration. Operate the engine lifter and slowly remove the engine from the vehicle. NOTE: Make sure that the engine is clear of all wiring and hose. While lowering the engine from the vehicle, do not allow it to contact the vehicle. Install the 2 engine hangers with the 2 bolts as shown in the illustration. Engine hanger ENGINE HANGER REFERENCE CHART Item Part No. No. 1 engine hanger 12281-38030 Bolt 90129-14120 Torque: 43 N*m (438 kgf*cm, 32 ft.*lbf) Attach an engine sling device and hang the engine with a chain block. NOTE: When hanging the engine, make sure to hang the engine with the sling device's hanging angle at 50° or less. If not, the engine or engine hangers may be damaged.
48. REMOVE ENGINE OIL LEVEL DIPSTICK GUIDE Remove the dipstick. Remove the 2 bolts and dipstick guide.
49. REMOVE NO. 1 EXHAUST MANIFOLD HEAT INSULATOR (See «REMOVAL» )
50. REMOVE EXHAUST MANIFOLD SUB-ASSEMBLY (for Bank 2) (See «REMOVAL» )
51. REMOVE OIL COOLER TUBE (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/automatic-trans/#automatic-transaxle-aa80e) )
52. REMOVE NO. 3 EXHAUST MANIFOLD HEAT INSULATOR (See «REMOVAL» )
53. REMOVE ENGINE WIRE for Engine LH Side: Disconnect the camshaft timing control valve connector. Disconnect the 4 ignition coil connectors. Disconnect the 2 VVT sensor connectors. Disconnect the fuel pump connector (for high pressure). Disconnect the No. 8 engine wire connector. Remove the 2 bolts and disconnect the clamp and 2 clamp brackets. Disconnect the engine coolant temperature sensor connector. Disconnect the oil pressure sensor connector. Disconnect the 2 camshaft timing control motor connectors (for Bank 1). Remove the 3 bolts and disconnect the 3 clamps and ground wire. Remove the bolt and clamp bracket. for Engine RH Side: Disconnect the camshaft timing control valve connector. Disconnect the 4 ignition coil connectors. Disconnect the 2 VVT sensor connectors. Disconnect the fuel pump connector (for high pressure). Disconnect the engine wire connector. Disconnect the 2 camshaft timing control motor connectors (for Bank 2). Disconnect the camshaft position sensor connector. Remove the nut and disconnect the generator wire and connector. Remove the nut and disconnect the starter wire and connector. Disconnect the crankshaft position sensor connector. Disconnect the engine oil level sensor connector. Remove the 3 bolts and disconnect the 3 clamp brackets and 2 clamps. Disconnect the throttle body connector. Disconnect the 4 injector driver connectors as shown in the illustration. Disconnect the purge VSV connector. Disconnect the intake air control valve actuator connector. Remove the 2 bolts and disconnect the 2 clamp brackets and clamp. Remove the 4 nuts and engine wire.
54. REMOVE STARTER ASSEMBLY (See «REMOVAL» )
55. REMOVE AUTOMATIC TRANSMISSION ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/automatic-trans/#automatic-transaxle-aa80e) )
56. REMOVE DRIVE PLATE AND RING GEAR SUB-ASSEMBLY Using SST, hold the crankshaft. SST 09213-54015 (90119-08216), 09330-00021 Remove the 10 bolts, rear spacer plate, drive plate and sensor rotor.
57. REMOVE FRONT SUSPENSION CROSSMEMBER SUB-ASSEMBLY Remove the 2 nuts, then remove the crossmember from the engine.
58. REMOVE ENGINE MOUNTING SPACER (See «REMOVAL» )
59. INSTALL ENGINE ON ENGINE STAND Install the engine onto an engine stand with the bolts. Remove the 2 bolts and 2 engine hangers.
60. REMOVE GENERATOR ASSEMBLY (See «REMOVAL» )
61. REMOVE ENGINE MOUNTING DAMPER Remove the 2 nuts and 2 mounting dampers.
62. REMOVE FRONT NO. 1 ENGINE MOUNTING BRACKET RH Remove the 6 bolts and mounting bracket.
63. REMOVE FRONT NO. 1 ENGINE MOUNTING BRACKET LH Remove the 6 bolts and mounting bracket.
64. REMOVE INJECTOR DRIVER (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake) )
65. REMOVE NO. 1 ENGINE COVER
66. REMOVE WATER BY-PASS PIPE SUB-ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake) )
67. REMOVE VENTILATION HOSE
68. REMOVE THROTTLE BODY ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
69. REMOVE INTAKE MANIFOLD (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake) )
70. REMOVE NO. 1 ENGINE COVER SUB-ASSEMBLY (See «REMOVAL» )
71. REMOVE NO. 3 COVER SUB-ASSEMBLY (See «REMOVAL» )
72. REMOVE FUEL TUBE SUB-ASSEMBLY (See «REMOVAL» )
73. REMOVE FUEL DELIVERY PIPE (for Port Injection) (See «REMOVAL» )
74. REMOVE FUEL INJECTOR ASSEMBLY (for Port Injection) (See «REMOVAL» )
75. REMOVE ENGINE COVER SUB-ASSEMBLY (See «REMOVAL» )
76. REMOVE FUEL PRESSURE PULSATION DAMPER ASSEMBLY (See «REMOVAL» )
77. REMOVE NO. 2 FUEL PIPE SUB-ASSEMBLY (See «REMOVAL» )
78. REMOVE NO. 3 FUEL PIPE SUB-ASSEMBLY (See «REMOVAL» )
79. REMOVE FUEL PUMP ASSEMBLY (for High Pressure) (See «REMOVAL» )
80. REMOVE NO. 4 FUEL PIPE SUB-ASSEMBLY (See «REMOVAL» )
81. REMOVE FUEL DELIVERY PIPE (for Direct Injection) (See «REMOVAL» )
82. REMOVE NO. 2 FUEL DELIVERY PIPE (for Direct Injection) (See «REMOVAL» )
83. REMOVE FUEL INJECTOR ASSEMBLY (for Direct Injection) (See «REMOVAL» )
84. REMOVE SEPARATOR CASE (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
85. REMOVE ENGINE WIRE Disconnect the 4 knock sensor connectors. Remove the 2 bolts and engine wire.
86. REMOVE NO. 4 ENGINE COVER SUB-ASSEMBLY Remove the engine cover.
87. REMOVE NO. 2 IDLER PULLEY SUB-ASSEMBLY Remove the bolt and idler pulley.
88. REMOVE NO. 1 IDLER PULLEY SUB-ASSEMBLY Remove the bolt and idler pulley.
89. REMOVE WATER PUMP PULLEY (See «REMOVAL» )
90. REMOVE WATER INLET HOUSING (See «REMOVAL» )
91. REMOVE ENGINE OIL PRESSURE SWITCH ASSEMBLY (See «REMOVAL» )
92. REMOVE ENGINE OIL LEVEL SENSOR Remove the 4 bolts and oil level sensor.
93. REMOVE ENGINE COOLANT TEMPERATURE SENSOR (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
94. REMOVE KNOCK SENSOR (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
95. REMOVE IGNITION COIL ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/ignition-system/#ignition) )

Scheme 71

Scheme 72

1. INSPECT EXHAUST MANIFOLD SUB-ASSEMBLY (for Bank 1) Using a precision straightedge and feeler gauge, measure the warpage of the contact surface of the cylinder head. Maximum warpage: 0.7 mm (0.028 in.) If the warpage is greater than the maximum, replace the exhaust manifold.
2. INSPECT EXHAUST MANIFOLD SUB-ASSEMBLY (for Bank 2) Using a precision straightedge and feeler gauge, measure the warpage of the contact surface of the cylinder head. Maximum warpage: 0.7 mm (0.028 in.) If the warpage is greater than the maximum, replace the exhaust manifold.

Scheme 73

Scheme 74

Scheme 75

Scheme 76

Scheme 77

Scheme 78

Scheme 79

Scheme 80

Scheme 81

Scheme 82

Scheme 83

Scheme 84

Scheme 85

Scheme 86

Scheme 87

Scheme 88

Scheme 89

Scheme 90

Scheme 91

Scheme 92

Scheme 93

Scheme 94

Scheme 95

Scheme 96

Scheme 97

Scheme 98

Scheme 99

Scheme 100

Scheme 101

Scheme 102

Scheme 103

Scheme 104

Scheme 105

Scheme 106

Scheme 107

Scheme 108

Scheme 109

Scheme 110

Scheme 111

Scheme 112

Scheme 113

1. INSTALL IGNITION COIL ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/ignition-system/#ignition) )
2. INSTALL KNOCK SENSOR (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
3. INSTALL ENGINE COOLANT TEMPERATURE SENSOR (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
4. INSTALL ENGINE OIL LEVEL SENSOR Install the oil level sensor with the 4 bolts. Torque: 7.0 N*m (71 kgf*cm, 62 in.*lbf)
5. INSTALL ENGINE OIL PRESSURE SWITCH ASSEMBLY (See «INSTALLATION» )
6. INSTALL WATER INLET HOUSING (See «INSTALLATION» )
7. INSTALL WATER PUMP PULLEY (See «INSTALLATION» )
8. INSTALL NO. 1 IDLER PULLEY SUB-ASSEMBLY Install the idler pulley with the bolt. Torque: 43 N*m (438 kgf*cm, 32 ft.*lbf) HINT: Install the No. 1 idler pulley in the direction shown in the illustration.
9. INSTALL NO. 2 IDLER PULLEY SUB-ASSEMBLY Install the idler pulley with the bolt. Torque: 43 N*m (438 kgf*cm, 32 ft.*lbf)
10. INSTALL NO. 4 ENGINE COVER SUB-ASSEMBLY Install the engine cover.
11. INSTALL ENGINE WIRE Install the engine wire with the 2 bolts. Torque: 10 N*m (102 kgf*cm, 7 in.*lbf) Connect the 4 knock sensor connectors.
12. INSTALL SEPARATOR CASE (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
13. INSTALL FUEL INJECTOR ASSEMBLY (for Direct Injection) (See «INSTALLATION» )
14. INSTALL NO. 2 FUEL DELIVERY PIPE (for Direct Injection) (See «INSTALLATION» )
15. INSTALL FUEL DELIVERY PIPE (for Direct Injection) (See «INSTALLATION» )
16. INSTALL NO. 4 FUEL PIPE SUB-ASSEMBLY (See «INSTALLATION» )
17. INSTALL FUEL PUMP ASSEMBLY (for High Pressure) (See «INSTALLATION» )
18. INSTALL NO. 3 FUEL PIPE SUB-ASSEMBLY (See «INSTALLATION» )
19. INSTALL NO. 2 FUEL PIPE SUB-ASSEMBLY (See «INSTALLATION» )
20. INSTALL FUEL PRESSURE PULSATION DAMPER ASSEMBLY (See «INSTALLATION» )
21. INSTALL ENGINE COVER SUB-ASSEMBLY (See «INSTALLATION» )
22. INSTALL FUEL INJECTOR ASSEMBLY (for Port Injection) (See «INSTALLATION» )
23. INSTALL FUEL DELIVERY PIPE (for Port Injection) (See «INSTALLATION» )
24. INSTALL FUEL TUBE SUB-ASSEMBLY (See «INSTALLATION» )
25. INSTALL NO. 3 COVER SUB-ASSEMBLY (See «INSTALLATION» )
26. INSTALL NO. 1 ENGINE COVER SUB-ASSEMBLY (See «INSTALLATION» )
27. INSTALL INTAKE MANIFOLD (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake__installation) )
28. INSTALL THROTTLE BODY ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
29. INSTALL VENTILATION HOSE
30. INSTALL WATER BY-PASS PIPE SUB-ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake__installation) )
31. INSTALL NO. 1 ENGINE COVER
32. INSTALL INJECTOR DRIVER (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake__installation) )
33. INSTALL FRONT NO. 1 ENGINE MOUNTING BRACKET RH Install the mounting bracket with the 6 bolts. Torque: 35 N*m (357 kgf*cm, 26 ft.*lbf)
34. INSTALL FRONT NO. 1 ENGINE MOUNTING BRACKET LH Install the mounting bracket with the 6 bolts. Torque: 35 N*m (357 kgf*cm, 26 ft.*lbf)
35. INSTALL ENGINE MOUNTING DAMPER Install the 2 mounting dampers with the 2 nuts. Torque: 11 N*m (112 kgf*cm, 8 ft.*lbf)
36. INSTALL GENERATOR ASSEMBLY (See «INSTALLATION» )
37. REMOVE ENGINE STAND Install the 2 engine hangers with the 2 bolts as shown in the illustration. Torque: 43 N*m (438 kgf*cm, 32 ft.*lbf) Attach an engine sling device and hang the engine with a chain block. NOTE: When hanging the engine, make sure to hang the engine with the sling device's hanging angle at 50° or less. If not, the engine or engine hangers may be damaged. Remove the bolts and engine assembly from the engine stand.
38. INSTALL ENGINE MOUNTING SPACER (See «INSTALLATION» )
39. INSTALL FRONT SUSPENSION CROSSMEMBER SUB-ASSEMBLY Install the crossmember with the 2 nuts. Torque: 35 N*m (357 kgf*cm, 26 ft.*lbf)
40. INSTALL DRIVE PLATE AND RING GEAR SUB-ASSEMBLY Using SST, hold the crankshaft. SST 09213-54015 (90119-08216), 09330-00021 Clean the their installation holes. Install the sensor rotor. HINT: Align the pin of the front spacer with the pin hole of the crankshaft. Install the drive plate and spacer plate on the crankshaft. Apply a few drops of adhesive to 2 or 3 threads of the bolt end. Adhesive Adhesive: Toyota Genuine Adhesive 1324, Three Bond 1324 or equivalent Uniformly install and tighten 10 new bolts in the sequence shown in the illustration. Torque: 30 N*m (301 kgf*cm, 22 ft.*lbf) NOTE: Do not reuse the drive plate installation bolts. Do not impact or damage the drive plate installation bolts. Be sure to handle them carefully. Mark the upside of each drive plate installation bolt with paint. Retighten the drive plate installation bolts by 90° as shown. Check that the painted marks are now at a 90° angle to the upside.
41. INSTALL AUTOMATIC TRANSMISSION ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/automatic-trans/#automatic-transaxle-aa80e) )
42. INSTALL STARTER ASSEMBLY (See «INSTALLATION» )
43. INSTALL ENGINE WIRE Install the engine wire with the 4 nuts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Connect the clamp and 2 clamp brackets with the 2 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Connect the intake air control valve actuator connector. Connect the purge VSV connector. Connect the 4 injector driver connectors as shown in the illustration. for Engine RH Side: Connect the 2 clamps and install the 3 clamp brackets with the 3 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Connect the engine oil level sensor connector. Connect the crankshaft position sensor connector. Connect the starter connector and starter wire with the nut. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Connect the generator connector and generator wire with the nut. Torque: 12 N*m (122 kgf*cm, 9 ft.*lbf) Connect the camshaft position sensor connector. Connect the engine wire connector. Connect the 2 camshaft timing control motor connectors (for Bank 2). Connect the fuel pump connector (for high pressure). Connect the 2 VVT sensor connectors. Connect the 4 ignition coil connectors. Connect the camshaft timing control valve connector. for Engine LH Side: Install the clamp bracket with the bolt. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Connect the 3 clamps and 3 ground wires with the 3 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Connect the 2 camshaft timing control motor connectors (for Bank 1). Connect the oil pressure sensor connector. Connect the engine coolant temperature sensor connector. Connect the clamp and install the 2 clamp brackets with the 2 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Connect the No. 8 engine wire connector. Connect the fuel pump connector (for high pressure). Connect the 2 VVT sensor connectors. Connect the 4 ignition coil connectors. Connect the camshaft timing control valve connector. Connect the throttle body connectors.
44. INSTALL NO. 3 EXHAUST MANIFOLD HEAT INSULATOR (See «INSTALLATION» )
45. INSTALL OIL COOLER TUBE (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/automatic-trans/#automatic-transaxle-aa80e) )
46. INSTALL EXHAUST MANIFOLD SUB-ASSEMBLY (for Bank 2) (See «INSTALLATION» )
47. INSTALL NO. 1 EXHAUST MANIFOLD HEAT INSULATOR (See «INSTALLATION» )
48. INSTALL ENGINE OIL LEVEL DIPSTICK GUIDE Apply a light coat of engine oil to a new O-ring. Install the O-ring to the guide. Install the dipstick guide with the 2 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Install the dipstick.
49. INSTALL ENGINE AND TRANSMISSION Place the engine on an engine lifter. HINT: Place the engine on wooden blocks or an equivalent so that the engine is level. Remove the 2 bolts and 2 engine hangers. Operate the engine lifter and install the engine to the vehicle. NOTE: Make sure that the engine is clear of all wiring and hoses. Align the crossmember to the marks on the vehicle, and temporarily install the engine and transmission with crossmember with the 4 bolts. NOTE: Make sure the crossmember is aligned to the vehicle marks as accurately as possible. If not performed accurately, the suspension alignment may become extremely misaligned. Tighten the 4 bolts. Torque: 204 N*m (2080 kgf*cm, 150 ft.*lbf) Install the 4 engine rear mounting member's bolts. Torque: 26 N*m (265 kgf*cm, 19 ft.*lbf)
50. CONNECT FLOOR SHIFT GEAR SHIFTING ROD SUB-ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/automatic-trans/#automatic-transaxle-aa80e) )
51. CONNECT FRONT NO. 2 LOWER SUSPENSION ARM ASSEMBLY Connect the front No. 2 lower suspension arm (see «INSTALLATION» ).
52. CONNECT COOLER COMPRESSOR ASSEMBLY Connect the cooler compressor with the 2 stud bolts, 2 nuts and 2 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) for stud bolts 25 N*m (255 kgf*cm, 18 ft.*lbf) for nuts 25 N*m (255 kgf*cm, 18 ft.*lbf) for bolts
53. INSTALL EXHAUST MANIFOLD SUB-ASSEMBLY (for Bank 1) (See «INSTALLATION» )
54. INSTALL NO. 2 EXHAUST MANIFOLD HEAT INSULATOR (See «INSTALLATION» )
55. INSTALL POWER STEERING LINK ASSEMBLY (w/ VGRS) (See «INSTALLATION» )
56. INSTALL POWER STEERING LINK ASSEMBLY (w/o VGRS) (See «INSTALLATION» )
57. INSTALL NO. 2 STEERING INTERMEDIATE SHAFT ASSEMBLY (w/ VGRS) (See «INSTALLATION» )
58. INSTALL NO. 2 STEERING INTERMEDIATE SHAFT ASSEMBLY (w/o VGRS) (See «INSTALLATION» )
59. INSTALL STEERING SLIDING YOKE WITH SHAFT SUB-ASSEMBLY (w/ VGRS) (See «INSTALLATION» )
60. INSTALL STEERING SLIDING YOKE WITH SHAFT SUB-ASSEMBLY (w/o VGRS) (See «INSTALLATION» )
61. INSTALL FRONT SUSPENSION MEMBER REINFORCEMENT LH (See «INSTALLATION» )
62. INSTALL FRONT SUSPENSION MEMBER REINFORCEMENT RH (See «INSTALLATION» )
63. INSTALL FRONT STABILIZER BAR Install the stabilizer bar (see «INSTALLATION» ).
64. INSTALL PROPELLER WITH CENTER BEARING SHAFT ASSEMBLY Install the propeller shaft (see «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/driveshaft-universal-joints/#propeller-shaft) ).
65. INSTALL NO. 1 EXHAUST PIPE SUPPORT BRACKET SUB-ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/automatic-trans/#automatic-transaxle-aa80e) )
66. INSTALL FRONT EXHAUST PIPE ASSEMBLY Install the front exhaust pipe (see «INSTALLATION» ).
67. CONNECT HOSES AND CONNECTORS Connect the purge line hose. Connect the 2 heater hoses. Connect the wires with No. 1 engine room junction block with the 2 nuts. Torque: 13 N*m (133 kgf*cm, 10 ft.*lbf) Connect the ground wire with the bolt. Torque: 21 N*m (214 kgf*cm, 15 ft.*lbf) Connect the 3 connectors with front controller with the clamp. Attach the clamp and connect the cooler compressor connector. Connect the 3 ECT connectors and 4 ECM connectors. Install the ECM box cover (upper).
68. CONNECT NO. 1 FUEL PIPE SUB-ASSEMBLY (See «INSTALLATION» )
69. CONNECT NO. 3 FUEL HOSE (See «INSTALLATION» )
70. INSTALL ENGINE ROOM ECU OUTLET DUCT Install the outlet duct.
71. CONNECT NO. 2 RADIATOR HOSE
72. CONNECT NO. 1 RADIATOR HOSE
73. INSTALL AIR CLEANER ASSEMBLY RH (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake__installation) )
74. INSTALL AIR CLEANER ASSEMBLY LH (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake__installation) )
75. INSTALL V-RIBBED BELT (See «INSTALLATION» )
76. INSTALL INTAKE AIR CONNECTOR PIPE (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
77. INSTALL NO. 1 AIR CLEANER INLET (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
78. INSTALL FRONT SUSPENSION CROSSMEMBER LOWER Install the suspension crossmember lower with the 6 bolts and 4 nuts. Torque: 30 N*m (306 kgf*cm, 22 ft.*lbf)
79. INSTALL FRONT BUMPER COVER Install the front bumper cover (see «INSTALLATION» ).
80. CONNECT NO. 1 OIL COOLER OUTLET HOSE Using needle-nose pliers, grip the claws of the clip and slide the clip to connect the oil cooler hose.
81. CONNECT NO. 1 OIL COOLER INLET HOSE Using needle-nose pliers, grip the claws of the clip and slide the clip to connect the oil cooler hose.
82. ADD ENGINE OIL (See «REPLACEMENT» )
83. ADD ENGINE COOLANT (See «REPLACEMENT»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
84. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
85. PERFORM INITIALIZATION Perform initialization (see «INITIALIZATION» ). NOTE: Certain systems need to be initialized after disconnecting and reconnecting the cable from the negative (-) battery terminal.
86. INSPECT FOR OIL LEAK Inspect for engine oil leak (see «INSTALLATION» ).
87. INSPECT FOR COOLANT LEAK (See «ON-VEHICLE INSPECTION»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
88. INSPECT FOR FUEL LEAK (See «ON-VEHICLE INSPECTION» )
89. INSPECT FOR EXHAUST GAS LEAK (See «INSTALLATION» )
90. INSTALL FRONT WHEEL
91. PLACE FRONT WHEELS FACING STRAIGHT AHEAD
92. CHECK AND ADJUST FRONT WHEEL ALIGNMENT Check and adjust the front wheel alignment (see «FRONT WHEEL ALIGNMENT (FOR 2WD)» ).
93. CHECK SHIFT LEVER POSITION (See «ON-VEHICLE INSPECTION»(/lexus/ls/iv-2006-2012/remont/automatic-trans/#automatic-transaxle-aa80f) )
94. INSTALL FRONT SUSPENSION MEMBER PROTECTOR LOWER Install the suspension member protector with the 8 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf)
95. INSTALL NO. 2 ENGINE UNDER COVER Install the under cover with the 8 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) for bolt A 27 N*m (275 kgf*cm, 20 ft.*lbf) for bolt B
96. INSTALL NO. 1 ENGINE UNDER COVER (See «REPLACEMENT»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
97. CHECK IGNITION TIMING (See «ON-VEHICLE INSPECTION» )
98. CHECK IDLE SPEED (See «ON-VEHICLE INSPECTION» )
99. CHECK CO/HC (See «ON-VEHICLE INSPECTION» )
100. CHECK ENGINE OIL LEVEL (See «LUBRICATION SYSTEM» )
101. INSTALL ENGINE ROOM SIDE COVER RH Install the side cover with the 4 clips.
102. INSTALL ENGINE ROOM SIDE COVER LH Install the side cover with the 4 clips.
103. INSTALL AIR CLEANER INLET COVER SUB-ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
104. INSTALL V-BANK COVER SUB-ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
105. INSTALL COWL TOP VENTILATOR LOUVER RH (See «INSTALLATION» )

Scheme 114

Scheme 115

Scheme 116

Scheme 117

Scheme 118

Scheme 119

Scheme 120

Scheme 121

Scheme 122

Scheme 123

Scheme 124

Scheme 125

Scheme 126

Scheme 127

Scheme 128

Scheme 129

Scheme 130

Scheme 131

Scheme 132

Scheme 133

Scheme 134

Scheme 135

Scheme 136

Scheme 137

Scheme 138

Scheme 139

Scheme 140

Scheme 141

Scheme 142

Scheme 143

Scheme 144

Scheme 145

Scheme 146

Scheme 147

Scheme 148

1. CHECK V-RIBBED BELT Check the belt for wear, cracks or other signs of damage. If any of the following defects is found, replace the V-ribbed belt. HINT: The belt is cracked. The belt is worn out to the extent that the cords are exposed. The belt has chunks missing from the ribs. Check that the belt fits properly in the ribbed grooves. HINT: Check with your hand to confirm that the belt has not slipped out of the groove on the bottom to the pulley. If it has slipped out, replace the V-ribbed belt. Install a new V-ribbed belt correctly.
2. INSPECT V-RIBBED BELT TENSIONER ASSEMBLY Check that nothing gets caught in the tensioner by turning it clockwise and counterclockwise. If a malfunction exists, replace the V-ribbed belt tensioner assembly.
3. INSPECT VALVE LASH ADJUSTER NOISE Rev up the engine several times. Check that the engine does not emit unusual noises. If unusual noises occur, warm up the engine and idle it for over 30 minutes. Then perform the inspection above again. If any defects or problems are found during the inspection above, perform a lash adjuster inspection (See «INSPECTION» ).
4. INSPECT IGNITION TIMING Warm up and stop the engine. When using the Techstream: Connect the Techstream to the DLC3. Start the engine and idle it. Turn the tester ON. Enter the following menus: Powertrain/Engine and ECT/Data List/Primary/IGN Advance. HINT: Refer to the Techstream operator's manual for further details. Standard Ignition Timing: 8 to 18 BTDC @ idle When not using the Techstream: Remove the V-bank cover. Remove the 5 clips and air cleaner inlet cover. Remove the 4 clips and engine room side cover LH. Remove the 2 bolts and No. 1 air cleaner inlet. Disconnect the air cleaner cap (for Bank 1). Remove the 2 nuts and air cleaner case (for Bank 1). Connect the tester probe of a timing light to the wire of the ignition connector for No. 1 cylinder. NOTE: Use a timing light that detects primary signals. Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3. SST 09843-18040 NOTE: Confirm the terminal numbers before connecting them. Connecting the wrong terminals can damage the engine. When checking the ignition timing, the transmission should be in neutral. Using a timing light, check the ignition timing. Standard Ignition Timing: 8 to 12 BTDC @ idle Remove SST from the DLC3. Check the ignition timing. Standard Ignition Timing: 8 to 18 BTDC @ idle Check that the ignition timing advances immediately when the engine speed is increased. Disconnect the timing light from the engine. Install the air cleaner case (for Bank 1) with the 2 nuts. Torque: 5.0 N*m (51 kgf*cm, 44 in.*lbf) Connect the air cleaner cap (for Bank 1). Install the No. 1 air cleaner inlet with the 2 bolts. Torque: 5.0 N*m (51 kgf*cm, 44 in.*lbf) Install the engine room side cover LH with the 4 clips. Install the air cleaner inlet cover with the 5 clips. Install the V-bank cover.
5. INSPECT ENGINE IDLE SPEED Warm up and stop the engine. When using the Techstream: Connect the Techstream to the DLC3. NOTE: Switch off all accessories and the A/C before connecting the Techstream. Race the engine at 2500 rpm for approximately 90 seconds. Turn the tester ON. Enter the following menus: Powertrain/Engine and ECT/Data List/Primary/Engine Speed. Standard Idle Speed: 700 to 800 rpm NOTE: When checking the idle speed, the transmission should be in neutral. HINT: Refer to the Techstream operator's manual for further details. If the idle speed is not as specified, check the air intake system. Disconnect the Techstream from the DLC3. When not using the Techstream: Using SST, connect a tachometer probe to terminal 9 (TAC) of the DLC3. SST 09843-18030 NOTE: Confirm the terminal numbers before connecting them. Connecting the wrong terminals can damage the engine. Race the engine at 2500 rpm for approximately 90 seconds. Check the idle speed. Idle Speed (Transmission Neutral Position): 700 to 800 rpm If the speed is not as specified, check the air intake system. Disconnect the tachometer from the DLC3.
6. INSPECT COMPRESSION Warm up and stop the engine. Remove the V-bank cover. Remove the 5 clips and air cleaner inlet cover. Remove the 8 clips and 2 engine room side covers. Remove the 2 bolts and No. 1 air cleaner inlet. Remove the 4 nuts and 2 air cleaner assemblies. Disconnect the cable from the negative (-) battery terminal (See «REMOVAL» ). Remove the battery and tray. Remove the 2 bolts, nut and skid control ECU. Remove the bolt, 2 nuts and skid control ECU bracket. Remove the bolt and engine oil level dipstick guide. Remove the 2 nuts and No. 5 engine cover. Remove the 2 nuts and No. 6 engine cover. Disconnect the 8 ignition coil connectors. Disconnect the 2 injector connectors as shown in the illustration. Remove the 8 bolts and 8 ignition coils. Remove the 8 spark plugs. Disconnect the 4 injector driver connectors as shown in the illustration. Cylinder under the battery installation position: Inspect the compression pressure. Insert a compression gauge into the spark plug hole. Install the battery and tray. Connect the cable to the negative (-) battery terminal. Depress and hold the brake pedal, and turn the engine switch on (IG). Then check the compression pressure. HINT: Always use a fully charged battery to obtain engine speed of 200 rpm or more. NOTE: The measurement must be done as quickly as possible. Standard Compression Pressure: 1400 kPa (14.2 kgf/cm 2, 203 psi) or higher Minimum Pressure: 980 kPa (9.9 kgf/cm 2, 142 psi) Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal (See «REMOVAL» ). Remove the battery and tray. Remove the compression gauge. Cylinder other than cylinder under the battery installation position: Inspect the compression pressure. Insert a compression gauge into the spark plug hole. Install the battery and tray. Connect the cable to the negative (-) battery terminal. Depress and hold the brake pedal, and turn the engine switch on (IG). Then check the compression pressure. HINT: Always use a fully charged battery to obtain engine speed of 200 rpm or more. NOTE: The measurement must be done as quickly as possible. Standard Compression Pressure: 1400 kPa (14.2 kgf/cm 2, 203 psi) or higher Minimum Pressure: 980 kPa (9.9 kgf/cm 2, 142 psi) Remove the compression gauge. Perform the inspection above for each cylinder. Check the pressure difference between each compression pressure. Pressure Difference: 100 kPa (1.0 kgf/cm 2, 14.5 psi) or less If the cylinder compression is low in one or more cylinders, pour a small amount of engine oil into the cylinder with low compression through its spark plug hole. Then inspect the cylinder compression pressure again. HINT: If adding oil helps boost the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged. If pressure stays low, a valve may be stuck or seated improperly, or there may be leakage in the gasket. Disconnect the cable from the negative (-) battery terminal (See «REMOVAL» ). Remove the battery and tray. Connect the 4 injector driver connectors as shown in the illustration. Install the 8 spark plugs. Install the 8 ignition coils with the 8 bolts. Disconnect the 8 ignition coil connectors. Connect the 2 injector connectors as shown in the illustration. Install the No. 6 engine cover with the 2 nuts. Install the No. 5 engine cover with the 2 nuts. Install the engine oil level dipstick guide with the bolt. Install the skid control ECU bracket with the bolt and 2 nuts. Install the skid control ECU with the 2 bolts and nut. Install the battery and tray. Connect the cable to the negative (-) battery terminal. Install the 2 air cleaner assemblies with the 4 nuts. Install the No. 1 air cleaner inlet with the 2 bolts. Install the 2 engine room side covers with the 8 clips. Install the air cleaner inlet cover with the 5 clips. Install the V-bank cover. Perform initialization (See «INITIALIZATION» ). NOTE: Certain systems need to be initialized after reconnecting the cable to the negative (-) battery terminal. Clear the DTCs (See «DTC CHECK/CLEAR»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) ).
7. INSPECT CO/HC HINT: This check determines whether or not the idle CO/HC complies with regulations. Start the engine. Keep the engine speed at 2500 rpm for approximately 180 seconds. Insert the CO/HC meter testing probe at least 40 cm (1.31 ft.) into the tailpipe during idling. Immediately check CO/HC concentration at idle and 2500 rpm. HINT: When performing the 2 mode (2500 rpm and idle) test, follow the measurement order prescribed by the applicable local regulations. If the CO/HC concentration does not comply with regulations, troubleshoot in the order given below. Check the A/F sensor (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) ) and heated oxygen sensor (See «INSPECTION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) ) operation. See the table below for possible causes, and then inspect and correct the applicable causes if necessary. SYMPTOM CHART CO HC Symptom Causes Normal High Rough idle Faulty ignitions Incorrect timing Plugs (contaminated, shorted, or gaps are defective) Leaky intake and exhaust valves Leaky cylinder Low High Rough idle (Fluctuating HC reading) Vacuum leaks PCV hose Intake manifold Throttle body Lean mixture causing misfire High High Rough idle (Black smoke from exhaust) Restricted air filter Faulty SFI system Faulty pressure Defective ECT sensor Faulty ECM Faulty injector Faulty throttle position sensor Faulty MAF sensor

Scheme 149

Scheme 150

Scheme 151

Scheme 152

Scheme 153

Scheme 154

Scheme 155

Scheme 156

Scheme 157

Scheme 158

Scheme 159

Scheme 160

Scheme 161

Scheme 162

Scheme 163

Scheme 164

Scheme 165

Scheme 166

Scheme 167

Scheme 168

Scheme 169

Scheme 170

Scheme 171

Scheme 172

Scheme 173

Scheme 174

Scheme 175

Scheme 176

Scheme 177

Scheme 178

Scheme 179

Scheme 180

Scheme 181

Scheme 182

Scheme 183

Scheme 184

Scheme 185

Scheme 186

Scheme 187

Scheme 188

Scheme 189

Scheme 190

Scheme 191

Scheme 192

1. PLACE FRONT WHEELS FACING STRAIGHT AHEAD
2. DISCHARGE FUEL SYSTEM PRESSURE (See «PRECAUTION» )
3. REMOVE COWL TOP VENTILATOR LOUVER (See «REMOVAL» )
4. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation. NOTE: After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
5. REMOVE V-BANK COVER SUB-ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
6. REMOVE AIR CLEANER INLET COVER SUB-ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
7. REMOVE NO. 1 AIR CLEANER INLET (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
8. REMOVE ENGINE ROOM SIDE COVER RH Remove the 4 clips and engine room side cover.
9. REMOVE ENGINE ROOM SIDE COVER LH Remove the 4 clips and engine room side cover.
10. RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM (See «REPLACEMENT» )
11. REMOVE FRONT CENTER FLOOR COVER Remove the 3 screws, 2 bolts, clip and floor cover.
12. REMOVE NO. 2 ENGINE UNDER COVER Remove the 4 screws, 2 clips and under cover.
13. REMOVE FRONT WHEEL OPENING EXTENSION PAD LH (See «REMOVAL» )
14. REMOVE FRONT WHEEL OPENING EXTENSION PAD RH (See «REMOVAL» )
15. REMOVE NO. 1 ENGINE UNDER COVER (See «COOLANT»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
16. REMOVE FRONT SUSPENSION MEMBER PROTECTOR LOWER Remove the 9 bolts and suspension member protector.
17. DRAIN ENGINE OIL (See «REPLACEMENT» )
18. DRAIN ENGINE COOLANT (See «COOLANT»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
19. DRAIN FRONT DIFFERENTIAL OIL (See «DIFFERENTIAL OIL» )
20. DISCONNECT NO. 1 OIL COOLER INLET HOSE Using needle-nose pliers, grip the claws of the clip and slide the clip to disconnect the oil cooler hose. HINT: Place a container under the connection before disconnecting the oil cooler hose because oil in the hose may spill out.
21. DISCONNECT NO. 1 OIL COOLER OUTLET HOSE Using needle-nose pliers, grip the claws of the clip and slide the clip to disconnect the oil cooler hose. HINT: Place a container under the connection before disconnecting the oil cooler hose because oil in the hose may spill out.
22. REMOVE FRONT WHEEL
23. REMOVE FRONT BUMPER COVER Remove the front bumper cover (See «REMOVAL» ).
24. REMOVE REAR FRAME SIDE RAIL Remove the 6 bolts, 4 nuts and 2 side rails.
25. REMOVE INTAKE AIR CONNECTOR PIPE (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
26. REMOVE AIR CLEANER ASSEMBLY LH (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake) )
27. REMOVE AIR CLEANER ASSEMBLY RH (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake) )
28. REMOVE RADIATOR RESERVOIR ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
29. REMOVE ENGINE ROOM ECU OUTLET DUCT Remove the outlet duct from the fan shroud and ECM box.
30. DISCONNECT NO. 1 RADIATOR HOSE
31. DISCONNECT NO. 2 RADIATOR HOSE
32. REMOVE RESONATOR BRACKET SUB-ASSEMBLY (See «REPLACEMENT» )
33. REMOVE V-RIBBED BELT (See «REMOVAL» )
34. REMOVE ENGINE OIL PRESSURE SWITCH ASSEMBLY (See «REMOVAL» )
35. DISCONNECT NO. 3 FUEL HOSE (See «REMOVAL» )
36. DISCONNECT NO. 1 FUEL HOSE (See «REMOVAL» )
37. DISCONNECT DISCHARGE HOSE SUB-ASSEMBLY (See «REMOVAL» )
38. DISCONNECT SUCTION HOSE SUB-ASSEMBLY (See «REMOVAL» )
39. DISCONNECT HOSES AND CONNECTORS Remove the 3 bolts and ECM box cover. Disconnect the 4 TCM connectors and 2 wiring harness support connectors. Detach the 2 wiring harness support clamps, and then detach the clamp of connector A from the ECM box. HINT: It is not necessary to disconnect the connection at A in the illustration. Lift up the wiring harness support and disconnect the 4 ECM connectors. Detach the 2 clamps. Then remove the 2 nuts and disconnect the wires with No. 1 engine room junction block. Detach the clamp and disconnect the 3 connectors with front controller. Release the locks of the power steering ECU connector A and disconnect the connectors B. Detach the 2 clamps. Remove the bolt and disconnect the ground wire. Disconnect the 2 connectors and detach the 5 clamps. Disconnect the 2 heater hoses. Disconnect the purge line hose.
40. REMOVE DRIVER SIDE KNEE AIRBAG ASSEMBLY Remove the driver side knee airbag (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/airbag/#supplemental-restraint-system) ).
41. REMOVE NO. 1 AIR DUCT SUB-ASSEMBLY Detach the 2 claws, and remove the bolt and air duct. NOTE: Be careful not to damage the air duct as its connection to the vehicle is very tight.
42. REMOVE NO. 2 STEERING INTERMEDIATE SHAFT ASSEMBLY (See «REMOVAL» )
43. REMOVE FRONT DRIVE SHAFT ASSEMBLY Remove the drive shaft (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/driveshaft-universal-joints/#drive-shaft) ).
44. REMOVE FRONT EXHAUST PIPE ASSEMBLY Remove the front exhaust pipe (See «REMOVAL» ).
45. REMOVE PROPELLER WITH CENTER BEARING SHAFT ASSEMBLY Remove the propeller shaft (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/driveshaft-universal-joints/#propeller-shaft) ).
46. DISCONNECT FLOOR SHIFT GEAR SHIFTING ROD SUB-ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/automatic-trans/#automatic-transaxle-aa80e) )
47. DISCONNECT FRONT LOWER SHOCK ABSORBER BRACKET SUB-ASSEMBLY RH Remove the bolt. Then disconnect the absorber and absorber bracket.
48. DISCONNECT FRONT LOWER SHOCK ABSORBER BRACKET SUB-ASSEMBLY LH Remove the bolt. Then disconnect the absorber and absorber bracket.
49. REMOVE ENGINE AND TRANSMISSION Place a mark (with spray, etc.) over the rear right vehicle side attachment area of the front frame, which is indicated in the illustration. Place a mark (with spray, etc.) over the rear left vehicle side attachment area of the front frame. Set an engine lifter underneath the engine. HINT: Place the engine on wooden blocks or an equivalent so that the engine is level. Remove the 4 rear engine mounting member's bolts. Remove the 4 bolts shown in the illustration. Operate the engine lifter and slowly remove the engine from the vehicle. NOTE: Make sure that the engine is clear of all wiring and hose. While lowering the engine from the vehicle, do not allow it to contact the vehicle. Install the 2 engine hangers with the 2 bolts as shown in the illustration. Engine Hanger ENGINE HANGER REFERENCE CHART Item Part No. No. 1 engine hanger 12281-38030 Bolt 90129-14120 Torque: 43 N*m (438 kgf*cm, 32 ft.*lbf) Attach an engine sling device and hang the engine with a chain block. NOTE: When hanging the engine, make sure to hang the engine with the sling device's hanging angle at 50° or less. If not, the engine or engine hangers may be damaged.
50. REMOVE FRONT FRAME ASSEMBLY Remove the 4 nuts and front frame.
51. REMOVE ENGINE OIL LEVEL DIPSTICK GUIDE Remove the dipstick. Remove the 2 bolts and dipstick guide. Remove the O-ring from the dipstick guide.
52. REMOVE GENERATOR ASSEMBLY (See «REMOVAL» )
53. REMOVE NO. 1 EXHAUST MANIFOLD HEAT INSULATOR (See «REMOVAL» )
54. REMOVE NO. 2 EXHAUST MANIFOLD HEAT INSULATOR (See «REMOVAL» )
55. REMOVE FRONT ENGINE MOUNTING INSULATOR (See «REMOVAL» )
56. REMOVE FRONT NO. 1 ENGINE MOUNTING BRACKET RH Remove the 5 bolts and mounting bracket.
57. REMOVE FRONT NO. 1 ENGINE MOUNTING BRACKET LH Remove the 5 bolts and mounting bracket.
58. REMOVE EXHAUST MANIFOLD SUB-ASSEMBLY RH (See «REMOVAL» )
59. REMOVE EXHAUST MANIFOLD SUB-ASSEMBLY LH (See «REMOVAL» )
60. REMOVE FRONT NO. 2 ENGINE MOUNTING BRACKET RH Remove the 2 nuts and mounting bracket.
61. REMOVE FRONT NO. 2 ENGINE MOUNTING BRACKET LH Remove the 2 nuts and mounting bracket.
62. REMOVE NO. 3 EXHAUST MANIFOLD HEAT INSULATOR (See «REMOVAL» )
63. REMOVE STARTER ASSEMBLY (See «REMOVAL» )
64. REMOVE FRONT PROPELLER SHAFT ASSEMBLY Put matchmarks on the transfer companion flange and the front propeller shaft. Using a screwdriver or equivalent, hold the transfer companion flange. Using a 6 mm socket hexagon wrench, loosen the 6 bolts. NOTE: Be careful not to damage the front propeller shaft. Put matchmarks on the front differential companion flange and the front propeller shaft. Using a screwdriver or equivalent, hold the differential companion flange. Using a 6 mm socket hexagon wrench, loosen the 6 bolts. NOTE: Be careful not to damage the front propeller shaft. Remove the 12 bolts, 4 constant velocity universal joint washers and front propeller shaft assembly.
65. REMOVE OIL COOLER TUBE (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/automatic-trans/#automatic-transaxle-aa80e) )
66. REMOVE NO. 3 COVER SUB-ASSEMBLY (See «REMOVAL» )
67. DISCONNECT WIRE HARNESS AND CONNECTOR (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/automatic-trans/#automatic-transaxle-aa80e) )
68. REMOVE AUTOMATIC TRANSMISSION ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/automatic-trans/#automatic-transaxle-aa80e) )
69. REMOVE DRIVE PLATE AND RING GEAR SUB-ASSEMBLY Using SST, hold the crankshaft. SST 09213-54015 (90119-08216), 09330-00021 Remove the 10 bolts, rear spacer plate, drive plate and sensor rotor.
70. INSTALL ENGINE ON ENGINE STAND Install the engine onto an engine stand with the bolts. Remove the 2 bolts and 2 engine hangers.
71. DISCONNECT COOLER COMPRESSOR ASSEMBLY Remove the 2 bolts, 2 nuts and 2 stud bolts and disconnect the cooler compressor.
72. REMOVE FRONT DIFFERENTIAL CARRIER ASSEMBLY (See «REMOVAL» )
73. REMOVE NO. 5 ENGINE COVER SUB-ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/ignition-system/#ignition) )
74. REMOVE NO. 6 ENGINE COVER SUB-ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/ignition-system/#ignition) )
75. REMOVE ENGINE WIRE for Engine LH Side: Disconnect the camshaft timing control valve connector. Disconnect the 4 ignition coil connectors. Disconnect the 2 VVT sensor connectors. Disconnect the fuel pump connector (for high pressure). Disconnect the No. 8 engine wire connector. Disconnect the 4 wire harness clamps. for Engine Front Side: Disconnect the engine coolant temperature sensor connector. Disconnect the 2 camshaft timing control motor connectors (for Bank 1). Disconnect the 2 camshaft timing control motor connectors (for Bank 2). Remove the 3 bolts and disconnect the clamp and ground wire. Remove the bolt and clamp bracket. for Engine RH Side: Disconnect the camshaft timing control valve connector. Disconnect the 4 ignition coil connectors. Disconnect the 2 VVT sensor connectors. Disconnect the fuel pump connector (for high pressure). Disconnect the camshaft position sensor connector. Detach the 4 wire harness clamps. Disconnect the crankshaft position sensor connector. Remove the 2 bolts and disconnect the engine oil level sensor connector. for Engine Rear Side: Disconnect the engine wire connector. Disconnect the fuel relief valve connector. Detach the 8 wire harness clamps. Remove the 2 bolts and disconnect the ground wire. Disconnect the throttle body connector. Disconnect the 8 injector driver connectors and detach the 2 clips as shown in the illustration. Disconnect the purge VSV connector. Disconnect the intake air control valve actuator connector. Remove the 2 bolts and disconnect the 2 clamp brackets and 2 clamps. Remove the 4 nuts and engine wire.
76. REMOVE INJECTOR DRIVER (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake) )
77. REMOVE NO. 1 ENGINE COVER
78. REMOVE WATER BY-PASS PIPE SUB-ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake) )
79. REMOVE PURGE VSV (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake) )
80. REMOVE VENTILATION HOSE
81. REMOVE THROTTLE BODY ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
82. REMOVE INTAKE MANIFOLD (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake) )
83. REMOVE FUEL TUBE SUB-ASSEMBLY (See «REMOVAL» )
84. REMOVE FUEL PRESSURE PULSATION DAMPER ASSEMBLY (See «REMOVAL» )
85. REMOVE NO. 3 FUEL PIPE SUB-ASSEMBLY (See «REMOVAL» )
86. REMOVE NO. 2 FUEL PIPE SUB-ASSEMBLY (See «REMOVAL» )
87. REMOVE ENGINE COVER SUB-ASSEMBLY (for Bank 1) (See «REMOVAL» )
88. REMOVE ENGINE COVER SUB-ASSEMBLY (for Bank 2) (See «REMOVAL» )
89. REMOVE FUEL PUMP ASSEMBLY (for Bank 1) (See «REMOVAL» )
90. REMOVE FUEL PUMP ASSEMBLY (for Bank 2) (See «REMOVAL» )
91. REMOVE FUEL DELIVERY PIPE (for Port Injection) (See «REMOVAL» )
92. REMOVE FUEL INJECTOR ASSEMBLY (for Port Injection) (See «REMOVAL» )
93. REMOVE NO. 1 ENGINE COVER SUB-ASSEMBLY (See «REMOVAL» )
94. REMOVE NO. 2 ENGINE COVER SUB-ASSEMBLY (See «REMOVAL» )
95. REMOVE NO. 2 ENGINE COVER SUB-ASSEMBLY LH (See «REMOVAL» )
96. REMOVE NO. 4 FUEL PIPE SUB-ASSEMBLY (See «REMOVAL» )
97. REMOVE FUEL DELIVERY PIPE (for Direct Injection) (See «REMOVAL» )
98. REMOVE NO. 2 FUEL DELIVERY PIPE (for Direct Injection) (See «REMOVAL» )
99. REMOVE FUEL INJECTOR ASSEMBLY (for Direct Injection) (See «REMOVAL» )
100. REMOVE FUEL INJECTOR SEAL (for Direct Injection) (See «REMOVAL» )
101. REMOVE SEPARATOR CASE (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
102. REMOVE ENGINE WIRE Detach the 5 clamps and remove the 2 bolts and engine wire. Disconnect the 4 knock sensor connectors.
103. REMOVE NO. 4 ENGINE COVER SUB-ASSEMBLY Remove the engine cover.
104. REMOVE KNOCK SENSOR (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
105. REMOVE NO. 2 IDLER PULLEY SUB-ASSEMBLY Remove the bolt and idler pulley.
106. REMOVE NO. 1 IDLER PULLEY SUB-ASSEMBLY Remove the bolt and idler pulley.
107. REMOVE WATER PUMP PULLEY (See «REMOVAL» )
108. REMOVE WATER INLET HOUSING Using needle-nose pliers, grip the claws of the clip and slide the clip to disconnect the water by-pass hose and water inlet hose. Remove the 3 bolts, water inlet housing and gasket.
109. REMOVE ENGINE OIL LEVEL SENSOR (See «REMOVAL» )
110. REMOVE ENGINE COOLANT TEMPERATURE SENSOR (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
111. REMOVE IGNITION COIL ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/ignition-system/#ignition) )

Scheme 193

Scheme 194

1. INSPECT EXHAUST MANIFOLD SUB-ASSEMBLY LH Using a precision straightedge and feeler gauge, measure the warpage of the contact surface of the cylinder head. Maximum warpage: 0.7 mm (0.0276 in.) If the warpage is greater than the maximum, replace the exhaust manifold LH.
2. INSPECT EXHAUST MANIFOLD SUB-ASSEMBLY RH Using a precision straightedge and feeler gauge, measure the warpage of the contact surface of the cylinder head. Maximum warpage: 0.7 mm (0.0276 in.) If the warpage is greater than the maximum, replace the exhaust manifold RH.

Scheme 195

Scheme 196

Scheme 197

Scheme 198

Scheme 199

Scheme 200

Scheme 201

Scheme 202

Scheme 203

Scheme 204

Scheme 205

Scheme 206

Scheme 207

Scheme 208

Scheme 209

Scheme 210

Scheme 211

Scheme 212

Scheme 213

Scheme 214

1. INSTALL IGNITION COIL ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/ignition-system/#ignition) )
2. INSTALL ENGINE COOLANT TEMPERATURE SENSOR (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
3. INSTALL ENGINE OIL LEVEL SENSOR (See «INSTALLATION» )
4. INSTALL WATER INLET HOUSING Install a new gasket and inlet housing with the 3 bolts. Torque: 21 N*m (214 kgf*cm, 15 ft.*lbf) Using needle-nose pliers, grip the claws of the clips and slide the clips to connect the water by-pass hoses and water inlet hose.
5. INSTALL WATER PUMP PULLEY (See «INSTALLATION» )
6. INSTALL NO. 1 IDLER PULLEY SUB-ASSEMBLY Install the idler pulley with the bolt. Torque: 43 N*m (438 kgf*cm, 32 ft.*lbf) HINT: Install the No. 1 idler pulley in the direction shown in the illustration.
7. INSTALL NO. 2 IDLER PULLEY SUB-ASSEMBLY Install the idler pulley with the bolt. Torque: 43 N*m (438 kgf*cm, 32 ft.*lbf)
8. INSTALL KNOCK SENSOR (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
9. INSTALL NO. 4 ENGINE COVER SUB-ASSEMBLY Install the engine cover.
10. INSTALL ENGINE WIRE Install the engine wire with the 2 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) for bolt A 12 N*m (122 kgf*cm, 9 ft.*lbf) for bolt B Connect the 4 knock sensor connectors and attach the 5 clamps.
11. INSTALL SEPARATOR CASE (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
12. INSTALL FUEL INJECTOR SEAL (for Direct Injection) (See «INSTALLATION» )
13. INSTALL FUEL INJECTOR ASSEMBLY (for Direct Injection) (See «INSTALLATION» )
14. INSTALL NO. 2 FUEL DELIVERY PIPE (for Direct Injection) (See «INSTALLATION» )
15. INSTALL FUEL DELIVERY PIPE (for Direct Injection) (See «INSTALLATION» )
16. INSTALL NO. 4 FUEL PIPE SUB-ASSEMBLY (See «INSTALLATION» )
17. INSTALL NO. 2 ENGINE COVER SUB-ASSEMBLY LH (See «INSTALLATION» )
18. INSTALL NO. 2 ENGINE COVER SUB-ASSEMBLY (See «INSTALLATION» )
19. INSTALL NO. 1 ENGINE COVER SUB-ASSEMBLY (See «INSTALLATION» )
20. INSTALL FUEL INJECTOR ASSEMBLY (for Port Injection) (See «INSTALLATION» )
21. INSTALL FUEL DELIVERY PIPE (for Port Injection) (See «INSTALLATION» )
22. INSTALL FUEL PUMP ASSEMBLY (for Bank 1) (See «INSTALLATION» )
23. INSTALL NO. 3 FUEL PIPE SUB-ASSEMBLY (See «INSTALLATION» )
24. INSTALL ENGINE COVER SUB-ASSEMBLY LH (for Bank 1) (See «INSTALLATION» )
25. INSTALL FUEL PUMP ASSEMBLY (for Bank 2) (See «INSTALLATION» )
26. INSTALL NO. 2 FUEL PIPE SUB-ASSEMBLY (See «INSTALLATION» )
27. INSTALL ENGINE COVER SUB-ASSEMBLY (for Bank 2) (See «INSTALLATION» )
28. INSTALL FUEL PRESSURE PULSATION DAMPER ASSEMBLY (See «INSTALLATION» )
29. CONNECT FUEL TUBE SUB-ASSEMBLY (See «INSTALLATION» )
30. INSTALL INTAKE MANIFOLD (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake__installation) )
31. INSTALL THROTTLE BODY ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
32. INSTALL VENTILATION HOSE
33. INSTALL PURGE VSV (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake__installation) )
34. INSTALL WATER BY-PASS PIPE SUB-ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake__installation) )
35. INSTALL NO. 1 ENGINE COVER
36. INSTALL INJECTOR DRIVER (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake__installation) )
37. INSTALL ENGINE WIRE Install the engine wire with the 4 nuts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Connect the 2 clamps and 2 clamp brackets with the 2 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) for bolt A 12 N*m (122 kgf*cm, 9 ft.*lbf) for bolt B Connect the intake air control valve actuator connector. Connect the purge VSV connector. Connect the 8 injector driver connectors and 2 clips as shown in the illustration. for Engine Rear Side: Install the ground wire with the 2 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Attach the 8 wire harness clamps. Connect the fuel relief valve connector. Connect the engine wire connector. for Engine RH Side: Connect the engine oil level sensor connector. Connect the crankshaft position sensor connector. Then install the wire harness with the 2 bolts. Torque: 13 N*m (133 kgf*cm, 10 ft.*lbf) Attach the 4 clamps. Connect the camshaft position sensor connector. Connect the fuel pump connector (for high pressure). Connect the 2 VVT sensor connectors. Connect the 4 ignition coil connectors. Connect the camshaft timing control valve connector. for Engine Front Side: Install the clamp bracket with the bolt. Torque: 12 N*m (122 kgf*cm, 9 ft.*lbf) Attach the clamp and install the 3 ground wire with the 3 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Connect the 2 camshaft timing control motor connectors (for Bank 2). Connect the 2 camshaft timing control motor connectors (for Bank 1). Connect the engine coolant temperature sensor connector. for Engine LH Side: Attach the 4 wire harness clamps. Connect the No. 8 engine wire connector. Connect the fuel pump connector (for high pressure). Connect the 2 VVT sensor connectors. Connect the 4 ignition coil connectors. Connect the camshaft timing control valve connector. Connect the throttle body connectors.
38. INSTALL NO. 6 ENGINE COVER SUB-ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/ignition-system/#ignition) )
39. INSTALL NO. 5 ENGINE COVER SUB-ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/ignition-system/#ignition) )
40. INSTALL FRONT DIFFERENTIAL CARRIER ASSEMBLY (See «INSTALLATION» )
41. CONNECT COOLER COMPRESSOR ASSEMBLY Connect the cooler compressor with the 2 stud bolts, 2 nuts and 2 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) for stud bolts 25 N*m (250 kgf*cm, 18 ft.*lbf) for nuts 25 N*m (250 kgf*cm, 18 ft.*lbf) for bolts
42. REMOVE ENGINE STAND Install the 2 engine hangers with the 2 bolts as shown in the illustration. Engine Hanger ENGINE HANGER REFERENCE CHART Item Part No. No. 1 engine hanger 12281-38030 Bolt 90129-14120 Torque: 43 N*m (438 kgf*cm, 32 ft.*lbf) Attach an engine sling device and hang the engine with a chain block. NOTE: When hanging the engine, make sure to hang the engine with the sling device's hanging angle at 50° or less. If not, the engine or engine hangers may be damaged. Remove the bolts and engine assembly from the engine stand.
43. INSTALL DRIVE PLATE AND RING GEAR SUB-ASSEMBLY Using SST, hold the crankshaft. SST 09213-54015 (90119-08216), 09330-00021 Clean the installation holes. Install the sensor rotor. HINT: Align the pin of the front spacer with the pin hole of the crankshaft. Install the drive plate and rear spacer plate on the crankshaft. Apply a few drops of adhesive to 2 or 3 threads of the bolt end. Adhesive: Toyota Genuine Adhesive 1324, Three Bond 1324 or equivalent Uniformly install and tighten 10 new bolts in the sequence shown in the illustration. Torque: 30 N*m (301 kgf*cm, 22 ft.*lbf) NOTE: Do not reuse the drive plate installation bolts. Do not impact or damage the drive plate installation bolts. Be sure to handle them carefully. Mark the upside of each drive plate installation bolt with paint. Retighten the drive plate installation bolts by 90° as shown. Check that the painted marks are now at a 90° angle to the upside.
44. INSTALL AUTOMATIC TRANSMISSION ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/automatic-trans/#automatic-transaxle-aa80e) )
45. CONNECT WIRE HARNESS AND CONNECTOR (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/automatic-trans/#automatic-transaxle-aa80e) )
46. INSTALL NO. 3 COVER SUB-ASSEMBLY (See «INSTALLATION» )
47. INSTALL OIL COOLER TUBE (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/automatic-trans/#automatic-transaxle-aa80e) )
48. INSTALL FRONT PROPELLER SHAFT ASSEMBLY Align the matchmarks on the transfer companion flange and the front propeller shaft. Temporarily install the front propeller shaft with 6 new bolts and the 2 constant velocity universal joint washers. Align the matchmarks on the differential companion flange and the front propeller shaft. Temporarily install the front propeller shaft with 6 new bolts and the 2 constant velocity universal joint washers. Using a screwdriver or equivalent, hold the transfer companion flange. Using a 6 mm socket hexagon wrench, tighten the 6 bolts. Torque: 25 N*m (255 kgf*cm, 18 ft.*lbf) NOTE: Be careful not to damage the front propeller shaft. Using a screwdriver or equivalent, hold the differential companion flange. Using a 6 mm socket hexagon wrench, tighten the 6 bolts. Torque: 25 N*m (255 kgf*cm, 18 ft.*lbf) NOTE: Be careful not to damage the front propeller shaft.
49. INSTALL STARTER ASSEMBLY (See «INSTALLATION» )
50. INSTALL NO. 3 EXHAUST MANIFOLD HEAT INSULATOR (See «INSTALLATION» )
51. INSTALL FRONT NO. 2 ENGINE MOUNTING BRACKET LH Temporarily install the No. 2 mounting bracket with the 2 nuts. Temporarily install the No. 1 mounting bracket with the 5 bolts. Tighten the 2 nuts. Torque: 21 N*m (214 kgf*cm, 15 ft.*lbf) Remove the 5 bolts and No. 1 mounting bracket.
52. INSTALL FRONT NO. 2 ENGINE MOUNTING BRACKET RH Temporarily install the No. 2 mounting bracket with the 2 nuts. Temporarily install the No. 1 mounting bracket with the 5 bolts. Tighten the 2 nuts. Torque: 21 N*m (214 kgf*cm, 15 ft.*lbf) Remove the 5 bolts and No. 1 mounting bracket.
53. INSTALL EXHAUST MANIFOLD SUB-ASSEMBLY LH (See «INSTALLATION» )
54. INSTALL EXHAUST MANIFOLD SUB-ASSEMBLY RH (See «INSTALLATION» )
55. INSTALL FRONT NO. 1 ENGINE MOUNTING BRACKET LH Install the mounting bracket with the 5 bolts. Torque: 35 N*m (357 kgf*cm, 26 ft.*lbf)
56. INSTALL FRONT NO. 1 ENGINE MOUNTING BRACKET RH Install the mounting bracket with the 5 bolts. Torque: 35 N*m (357 kgf*cm, 26 ft.*lbf)
57. INSTALL FRONT ENGINE MOUNTING INSULATOR (See «INSTALLATION» )
58. INSTALL NO. 2 EXHAUST MANIFOLD HEAT INSULATOR (See «INSTALLATION» )
59. INSTALL NO. 1 EXHAUST MANIFOLD HEAT INSULATOR (See «INSTALLATION» )
60. INSTALL GENERATOR ASSEMBLY (See «INSTALLATION» )
61. INSTALL ENGINE OIL LEVEL DIPSTICK GUIDE Apply a light coat of engine oil to a new O-ring. Install the O-ring to the guide. Install the dipstick guide with the 2 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Install the dipstick.
62. INSTALL FRONT FRAME ASSEMBLY Slowly lower the engine and set it to the front frame. Install the 4 nuts. Torque: 70 N*m (714 kgf*cm, 52 ft.*lbf)
63. INSTALL ENGINE AND TRANSMISSION Place the engine on an engine lifter. HINT: Place the engine on wooden blocks or an equivalent so that the engine is level. Remove the 2 bolts and 2 engine hangers. Operate the engine lifter and install the engine to the vehicle. NOTE: Make sure that the engine is clear of all wiring and hoses. Align the front frame to the marks on the vehicle, and temporarily install the front frame with the 4 bolts. NOTE: Make sure the crossmember is aligned to the vehicle marks as accurately as possible. If not performed accurately, the suspension alignment may become extremely misaligned. Install the 4 rear engine mounting member's bolts. Torque: 26 N*m (260 kgf*cm, 19 ft.*lbf) Tighten the 4 front frame bolts. Torque: 204 N*m (2080 kgf*cm, 150 ft.*lbf)
64. INSTALL FRONT LOWER SHOCK ABSORBER BRACKET SUB-ASSEMBLY LH Connect the absorber and absorber bracket. Then install the bolt. Torque: 48 N*m (489 kgf*cm, 35 ft.*lbf)
65. INSTALL FRONT LOWER SHOCK ABSORBER BRACKET SUB-ASSEMBLY RH Connect the absorber and absorber bracket. Then install the bolt. Torque: 48 N*m (489 kgf*cm, 35 ft.*lbf)
66. CONNECT FLOOR SHIFT GEAR SHIFTING ROD SUB-ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/automatic-trans/#automatic-transaxle-aa80e) )
67. INSTALL PROPELLER WITH CENTER BEARING SHAFT ASSEMBLY Install the propeller shaft (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/driveshaft-universal-joints/#propeller-shaft) ).
68. INSTALL FRONT EXHAUST PIPE ASSEMBLY Install the front exhaust pipe (See «INSTALLATION» ).
69. INSTALL FRONT DRIVE SHAFT ASSEMBLY Install the front drive shaft (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/driveshaft-universal-joints/#drive-shaft) ).
70. INSTALL NO. 2 STEERING INTERMEDIATE SHAFT ASSEMBLY (See «INSTALLATION» )
71. INSTALL NO. 1 AIR DUCT SUB-ASSEMBLY Attach the 2 claws to install the air duct with the bolt. Torque: 9.8 N*m (100 kgf*cm, 87 in.*lbf)
72. INSTALL DRIVER SIDE KNEE AIRBAG ASSEMBLY Install the driver side knee airbag (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/airbag/#supplemental-restraint-system) ).
73. CONNECT HOSES AND CONNECTORS Connect the purge line hose. Connect the 2 heater hoses. Attach the 5 clamps and connect the 2 connectors. Connect the ground wire with the bolt. Torque: 21 N*m (214 kgf*cm, 15 ft.*lbf) Connect the 2 power steering ECU connectors and attach the 2 clamps. HINT: Refer to the following procedures to connect A the power steering ECU connector (See «INSTALLATION» ). Connect the 3 connectors with front controller with the clamp. Connect the wires with No. 1 engine room junction block with the 2 nuts. Then attach the 2 clamps. Torque: 13 N*m (133 kgf*cm, 10 ft.*lbf) Lift up the wiring harness support and connect the 4 ECM connectors. Install the wiring harness support to the ECM box. Attach the clip of connector A to the ECM box. Connect the 4 TCM connectors and 2 wiring harness support connectors. Install the ECM box cover (upper). Torque: 5.5 N*m (56 kgf*cm, 49 in.*lbf)
74. CONNECT SUCTION HOSE SUB-ASSEMBLY (See «INSTALLATION» )
75. CONNECT DISCHARGE HOSE SUB-ASSEMBLY (See «INSTALLATION» )
76. CONNECT NO. 1 FUEL HOSE (See «INSTALLATION» )
77. CONNECT NO. 3 FUEL HOSE (See «INSTALLATION» )
78. INSTALL ENGINE OIL PRESSURE SWITCH ASSEMBLY (See «INSTALLATION» )
79. INSTALL V-RIBBED BELT (See «INSTALLATION» )
80. INSTALL RESONATOR BRACKET SUB-ASSEMBLY (See «REPLACEMENT» )
81. CONNECT NO. 2 RADIATOR HOSE
82. CONNECT NO. 1 RADIATOR HOSE
83. INSTALL RADIATOR RESERVOIR ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
84. INSTALL ENGINE ROOM ECU OUTLET DUCT Install the outlet duct to the fan shroud and ECM box.
85. INSTALL AIR CLEANER ASSEMBLY RH (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake__installation) )
86. INSTALL AIR CLEANER ASSEMBLY LH (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake__installation) )
87. INSTALL INTAKE AIR CONNECTOR PIPE (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
88. INSTALL REAR FRAME SIDE RAIL Install the side rail with the 6 bolts and 4 nuts. Torque: 30 N*m (306 kgf*cm, 22 ft.*lbf)
89. INSTALL FRONT BUMPER COVER Install the front bumper cover (See «INSTALLATION» ).
90. CONNECT NO. 1 OIL COOLER OUTLET HOSE Using needle-nose pliers, grip the claws of the clip and slide the clip to connect the oil cooler hose.
91. CONNECT NO. 1 OIL COOLER INLET HOSE Using needle-nose pliers, grip the claws of the clip and slide the clip to connect the oil cooler hose.
92. INSTALL NO. 1 AIR CLEANER INLET (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
93. ADD ENGINE OIL (See «REPLACEMENT» )
94. ADD ENGINE COOLANT (See «REPLACEMENT»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
95. ADD DIFFERENTIAL OIL (See «DIFFERENTIAL OIL» )
96. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
97. PERFORM INITIALIZATION Perform initialization (See «INITIALIZATION» ). NOTE: Certain systems need to be initialized after disconnecting and reconnecting the cable from the negative (-) battery terminal.
98. CHARGE REFRIGERANT (See «REPLACEMENT» )
99. INSPECT FOR REFRIGERANT (See «REPLACEMENT» )
100. INSPECT FOR OIL LEAK (See «INSTALLATION» )
101. INSPECT FOR COOLANT LEAK (See «ON-VEHICLE INSPECTION»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
102. INSPECT FOR FUEL LEAK (See «ON-VEHICLE INSPECTION» )
103. INSPECT FOR EXHAUST GAS LEAK (See «INSTALLATION» )
104. INSTALL FRONT WHEEL
105. CHECK SHIFT LEVER POSITION (See «ON-VEHICLE INSPECTION»(/lexus/ls/iv-2006-2012/remont/automatic-trans/#automatic-transaxle-aa80e) )
106. CHECK IGNITION TIMING (See «ON-VEHICLE INSPECTION» )
107. CHECK IDLE SPEED (See «ON-VEHICLE INSPECTION» )
108. CHECK CO/HC (See «ON-VEHICLE INSPECTION» )
109. INSTALL FRONT SUSPENSION MEMBER PROTECTOR LOWER Install the suspension member protector with the 9 bolts. Torque: 20 N*m (204 kgf*cm, 15 ft.*lbf) for bolt A 50 N*m (510 kgf*cm, 37 ft.*lbf) for other bolt
110. INSTALL NO. 1 ENGINE UNDER COVER (See «REPLACEMENT»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
111. INSTALL FRONT WHEEL OPENING EXTENSION PAD RH (See «INSTALLATION» )
112. INSTALL FRONT WHEEL OPENING EXTENSION PAD LH (See «INSTALLATION» )
113. INSTALL NO. 2 ENGINE UNDER COVER Install the under cover with the 4 screws and 2 clips.
114. INSTALL FRONT FLOOR COVER CENTER Install the floor cover with the 3 screws, 2 bolts and clip. Torque: 5.4 N*m (55 kgf*cm, 48 in.*lbf)
115. CHECK ENGINE OIL LEVEL (See «LUBRICATION SYSTEM» )
116. PLACE FRONT WHEELS FACING STRAIGHT AHEAD
117. CHECK AND ADJUST FRONT WHEEL ALIGNMENT Check and adjust the front wheel alignment (See «FRONT WHEEL ALIGNMENT (FOR AWD)» ).
118. INSTALL ENGINE ROOM SIDE COVER RH Install the side cover with the 4 clips.
119. INSTALL ENGINE ROOM SIDE COVER LH Install the side cover with the 4 clips.
120. INSTALL AIR CLEANER INLET COVER SUB-ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
121. INSTALL V-BANK COVER SUB-ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
122. INSTALL COWL TOP VENTILATOR LOUVER RH (See «INSTALLATION» )

Scheme 215

Scheme 216

Scheme 217

1. REMOVE V-BANK COVER SUB-ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
2. REMOVE AIR CLEANER INLET COVER SUB-ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
3. REMOVE NO. 1 AIR CLEANER INLET (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
4. REMOVE INTAKE AIR CONNECTOR PIPE (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
5. REMOVE V-RIBBED BELT Rotate the tensioner pulley counterclockwise to loosen the belt tension. HINT: The pulley bolt for the belt tensioner has a left-handed thread. While turning the belt tensioner counterclockwise, align the holes. Insert a bar of 5 mm (0.197 in.) into the holes to fix the belt tensioner in place. Remove the V-ribbed belt.

Scheme 218

1. INSTALL V-RIBBED BELT Install the V-ribbed belt as shown in the illustration. NOTE: Check that the V-ribbed belt is properly set to each pulley. Rotate the tensioner pulley counterclockwise, and then remove the fix bar.
2. INSTALL INTAKE AIR CONNECTOR PIPE (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
3. INSTALL NO. 1 AIR CLEANER INLET (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
4. INSTALL AIR CLEANER INLET COVER SUB-ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
5. INSTALL V-BANK COVER SUB-ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )

Scheme 219

Scheme 220

Scheme 221

Scheme 222

Scheme 223

1. INSPECT WATER PUMP ASSEMBLY Visually check the air hole and drain hole for coolant leakage. If leakage is found, replace the water pump assembly. Turn the pulley and check that the water pump bearing moves smoothly and quietly. If necessary, replace the water pump assembly.

Scheme 224

Scheme 225

Scheme 226

Scheme 227

Scheme 228

Scheme 229

1. REMOVE NO. 1 ENGINE UNDER COVER (See «COOLANT»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
2. DRAIN ENGINE COOLANT (See «COOLANT»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
3. REMOVE V-BANK COVER SUB-ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
4. REMOVE AIR CLEANER INLET COVER SUB-ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
5. REMOVE ENGINE ROOM SIDE COVER RH (See «REMOVAL» )
6. REMOVE NO. 1 AIR CLEANER INLET (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
7. REMOVE RADIATOR RESERVOIR ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
8. REMOVE INTAKE AIR CONNECTOR PIPE (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
9. REMOVE V-RIBBED BELT (See «REMOVAL» )
10. DISCONNECT ENGINE OIL LEVEL DIPSTICK GUIDE (for 2WD) Remove the bolt and disconnect the dipstick guide.
11. DISCONNECT NO. 2 RADIATOR HOSE
12. DISCONNECT NO. 5 WATER BY-PASS HOSE Using needle-nose pliers, grip the claws of the clip and slide the clip to disconnect the No. 5 water bypass hose.
13. DISCONNECT WATER INLET HOSE Using needle-nose pliers, grip the claws of the clip and slide the clip to disconnect the water inlet hose.
14. DISCONNECT NO. 3 WATER BY-PASS HOSE Using needle-nose pliers, grip the claws of the clip and slide the clip to disconnect the No. 3 water bypass hose.
15. REMOVE WATER INLET HOUSING Remove the 3 bolts, water inlet housing and gasket.
16. REMOVE WATER PUMP PULLEY Using SST, hold the water pump pulley. SST 09960-10010 (09962-01000, 09963-01000) Remove the 4 bolts and water pump pulley.
17. REMOVE WATER PUMP ASSEMBLY Remove the 9 bolts, water pump and gasket.

Scheme 230

Scheme 231

Scheme 232

Scheme 233

1. INSTALL WATER PUMP ASSEMBLY Install the water pump and gasket with the 9 bolts as shown in the illustration. Torque: 20 N*m (204 kgf*cm, 15 ft.*lbf) for bolt A 23 N*m (235 kgf*cm, 17 ft.*lbf) for bolt B 47 N*m (479 kgf*cm, 35 ft.*lbf) for bolt C
2. INSTALL WATER PUMP PULLEY Temporarily install the pulley with the 4 bolts. Using SST, hold the pulley and tighten the 4 bolts. SST 09960-10010 (09962-01000, 09963-01000) Torque: 21 N*m (214 kgf*cm, 15 ft.*lbf)
3. INSTALL WATER INLET HOUSING Install a new gasket to the water pump. Install the water inlet housing with the 3 bolts. Torque: 21 N*m (214 kgf*cm, 15 ft.*lbf)
4. CONNECT NO. 3 WATER BY-PASS HOSE Using needle-nose pliers, grip the claws of the clip and slide the clip to connect the No. 3 water by-pass hose.
5. CONNECT WATER INLET HOSE Using needle-nose pliers, grip the claws of the clip and slide the clip to connect the water inlet hose.
6. CONNECT NO. 5 WATER BY-PASS HOSE Using needle-nose pliers, grip the claws of the clip and slide the clip to connect the No. 5 water by-pass hose.
7. CONNECT NO. 2 RADIATOR HOSE
8. CONNECT ENGINE OIL LEVEL DIPSTICK GUIDE (for 2WD) Connect the dipstick guide with the bolt. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf)
9. INSTALL V-RIBBED BELT (See «INSTALLATION» )
10. INSTALL INTAKE AIR CONNECTOR PIPE (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
11. INSTALL RADIATOR RESERVOIR ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
12. INSTALL NO. 1 AIR CLEANER INLET (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
13. INSTALL ENGINE ROOM SIDE COVER RH (See «INSTALLATION» )
14. INSTALL AIR CLEANER INLET COVER SUB-ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
15. INSTALL V-BANK COVER SUB-ASSEMBLY (See «INSTALLATION»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
16. ADD ENGINE COOLANT (See «REPLACEMENT»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
17. INSPECT FOR COOLANT LEAK (See «ON-VEHICLE INSPECTION»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
18. INSTALL NO. 1 ENGINE UNDER COVER (See «REPLACEMENT»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )

Scheme 234

Scheme 235

Scheme 236

Scheme 237

Scheme 238

Scheme 239

Scheme 240

Scheme 241

Scheme 242

Scheme 243

Scheme 244

Scheme 245

Scheme 246

Scheme 247

Scheme 248

Scheme 249

Scheme 250

Scheme 251

Scheme 252

Scheme 253

Scheme 254

Scheme 255

Scheme 256

Scheme 257

Scheme 258

Scheme 259

Scheme 260

Scheme 261

Scheme 262

Scheme 263

Scheme 264

Scheme 265

1. DISCHARGE FUEL SYSTEM PRESSURE (See «PRECAUTION» )
2. REMOVE COWL TOP VENTILATOR LOUVER RH (See «REMOVAL» )
3. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation. NOTE: After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
4. REMOVE V-BANK COVER SUB-ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
5. REMOVE AIR CLEANER INLET COVER SUB-ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
6. REMOVE NO. 1 AIR CLEANER INLET (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
7. REMOVE ENGINE ROOM SIDE COVER LH (See «REMOVAL» )
8. REMOVE ENGINE ROOM SIDE COVER RH (See «REMOVAL» )
9. REMOVE BATTERY CLAMP SUB-ASSEMBLY Remove the nut, battery clamp and 2 clamp bolts.
10. REMOVE BATTERY TRAY Remove the battery insulator and battery. Remove the 3 bolts and battery tray.
11. REMOVE NO. 1 ENGINE UNDER COVER (See «COOLANT»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
12. REMOVE NO. 2 ENGINE UNDER COVER (See «REMOVAL» )
13. REMOVE FRONT SUSPENSION MEMBER PROTECTOR LOWER (See «REMOVAL» )
14. REMOVE ENGINE UNDER COVER REAR LH (See «FRONT STABILIZER BAR (FOR 2WD)» )
15. REMOVE ENGINE UNDER COVER REAR RH (See «FRONT STABILIZER BAR (FOR 2WD)» )
16. DRAIN ENGINE OIL (See «REPLACEMENT» )
17. DRAIN ENGINE COOLANT (See «COOLANT»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
18. REMOVE INTAKE AIR CONNECTOR PIPE (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
19. REMOVE AIR CLEANER ASSEMBLY RH (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake) )
20. REMOVE AIR CLEANER ASSEMBLY LH (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake) )
21. REMOVE RADIATOR RESERVOIR ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/cooling-system-mechanical/#cooling) )
22. REMOVE V-RIBBED BELT (See «REMOVAL» )
23. DISCONNECT NO. 1 RADIATOR HOSE
24. DISCONNECT NO. 2 RADIATOR HOSE
25. REMOVE ENGINE ROOM ECU OUTLET DUCT (See «REMOVAL» )
26. REMOVE SKID CONTROL ECU (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/anti-locktraction-control/#brake-control) )
27. REMOVE SKID CONTROL ECU BRACKET (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/anti-locktraction-control/#brake-control) )
28. DISCONNECT ENGINE WIRE for Engine Room LH Side: Remove the ECM box cover (upper). Disconnect the 3 ECT connectors and 4 ECM connectors from the ECM box. Disconnect the camshaft timing control valve connector. Disconnect the 4 ignition coil connectors. Disconnect the 2 VVT sensor connectors. Disconnect the fuel pump connector (for high pressure). Disconnect the No. 8 engine wire connector. Remove the 2 bolts and disconnect the clamp and 2 clamp brackets. Disconnect the engine coolant temperature sensor connector. Disconnect the engine oil pressure sensor connector. Disconnect the 2 camshaft timing control motor connectors (for Bank 1). Detach the clamp and disconnect the cooler compressor connector. Remove the 3 bolts and disconnect the 3 clamps and ground wire. Remove the bolt and clamp bracket. for Engine Room RH Side: Detach the clamp and disconnect the 3 connectors with front controller. Remove the 2 nuts and disconnect the wires with No. 1 engine room junction block. Disconnect the camshaft timing control valve connector. Disconnect the 4 ignition coil connectors. Disconnect the 2 VVT sensor connectors. Disconnect the fuel pump connector (for high pressure). Disconnect the engine wire connector. Disconnect the 2 camshaft timing control motor connectors (for Bank 2). Disconnect the camshaft position sensor connector. Remove the nut and disconnect the generator wire and connector. Remove the nut and disconnect the starter wire and connector. Disconnect the crankshaft position sensor connector. Disconnect the engine oil level sensor connector. Remove the 3 bolts, and disconnect the 3 clamp brackets and 2 clamps. Remove the bolt and disconnect the ground wire. Disconnect the 4 injector connectors as shown in the illustration. Disconnect the purge VSV connector. Disconnect the intake air control valve actuator connector. Remove the 2 bolts and disconnect the 2 clamp brackets and clamp. Remove the 4 nuts and disconnect the engine wire.
29. REMOVE FRONT EXHAUST PIPE ASSEMBLY Remove the front exhaust pipe (See «REMOVAL» ).
30. DISCONNECT FRONT STABILIZER BAR (See «REMOVAL» )
31. REMOVE FRONT SUSPENSION MEMBER REINFORCEMENT LH (See «REMOVAL» )
32. REMOVE STEERING SLIDING YOKE WITH SHAFT SUB-ASSEMBLY (w/ VGRS) (See «REMOVAL» )
33. REMOVE STEERING SLIDING YOKE WITH SHAFT SUB-ASSEMBLY (w/o VGRS) (See «REMOVAL» )
34. REMOVE NO. 2 STEERING INTERMEDIATE SHAFT ASSEMBLY (w/ VGRS) (See «REMOVAL» )
35. REMOVE NO. 2 STEERING INTERMEDIATE SHAFT ASSEMBLY (w/o VGRS) (See «REMOVAL» )
36. REMOVE NO. 2 EXHAUST MANIFOLD HEAT INSULATOR (See «REMOVAL» )
37. REMOVE EXHAUST MANIFOLD SUB-ASSEMBLY (for Bank 1) (See «REMOVAL» )
38. DISCONNECT COOLER COMPRESSOR ASSEMBLY (See «REMOVAL» )
39. REMOVE OIL LEVEL DIPSTICK GUIDE (See «REMOVAL» )
40. REMOVE GENERATOR ASSEMBLY (See «REMOVAL» )
41. REMOVE INJECTOR DRIVER (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake) )
42. REMOVE NO. 1 ENGINE COVER SUB-ASSEMBLY
43. REMOVE WATER BY-PASS PIPE SUB-ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake) )
44. REMOVE INTAKE MANIFOLD (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/mechanical/#intake) )
45. REMOVE NO. 3 ENGINE COVER (See «REMOVAL» )
46. REMOVE ENGINE COVER SUB-ASSEMBLY (See «REMOVAL» )
47. REMOVE FUEL PRESSURE PULSATION DAMPER ASSEMBLY (See «REMOVAL» )
48. REMOVE NO. 3 FUEL PIPE SUB-ASSEMBLY (See «REMOVAL» )
49. REMOVE NO. 2 FUEL PIPE SUB-ASSEMBLY (See «REMOVAL» )
50. REMOVE FUEL PUMP ASSEMBLY (for High Pressure) (See «REMOVAL» )
51. REMOVE WATER INLET HOUSING Using needle-nose pliers, grip the claws of the clip and slide the clip to disconnect the water by-pass hose and water inlet hose. Remove the 3 bolts, water inlet housing and gasket.
52. REMOVE WATER PUMP PULLEY (See «REMOVAL» )
53. REMOVE NO. 2 IDLER PULLEY SUB-ASSEMBLY (See «REMOVAL» )
54. REMOVE NO. 1 IDLER PULLEY SUB-ASSEMBLY (See «REMOVAL» )
55. REMOVE V-RIBBED BELT TENSIONER ASSEMBLY Remove the standard bolt, 6 mm hexagon wrench bolt and belt tensioner.
56. REMOVE FRONT WATER BY-PASS JOINT (See «DISASSEMBLY» )
57. REMOVE CAMSHAFT TIMING CONTROL MOTOR ASSEMBLY (for Bank 1) (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
58. REMOVE CAMSHAFT TIMING CONTROL MOTOR ASSEMBLY (for Bank 2) (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/testing-diagnostics/#engine-control-system) )
59. REMOVE OIL FILTER ELEMENT (See «REPLACEMENT» )
60. REMOVE OIL FILTER BRACKET Remove the 3 bolts, filter bracket and 2 gaskets.
61. REMOVE RESONATOR BRACKET SUB-ASSEMBLY (See «REPLACEMENT» )
62. REMOVE CRANKSHAFT PULLEY Using SST, loosen the crankshaft pulley set bolt. SST 09213-54015 (90119-08216), 09330-00021 Using the pulley set bolt and SST, remove the crankshaft pulley. SST 09950-50013 (09951-05010, 09952-05010, 09953-05010, 09954-05011)
63. REMOVE IGNITION COIL ASSEMBLY (See «REMOVAL»(/lexus/ls/iv-2006-2012/remont/ignition-system/#ignition) )
64. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY (for Bank 1) Remove the 15 bolts, 2 seal washers, cylinder head cover and gasket. HINT: Make sure the removed parts are returned to the same places they were removed from. Remove the 4 gaskets and 2 O-rings from the camshaft bearing caps (No. 2, No. 3, No. 7).
65. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY (for Bank 2) Remove the 15 bolts, 2 seal washers, cylinder head cover and gasket. HINT: Make sure the removed parts are returned to the same places they were removed from. Remove the 4 gaskets and 2 O-rings from the camshaft bearing caps (No. 1, No. 3, No. 6).
66. REMOVE TIMING CHAIN COVER SUB-ASSEMBLY Remove the 2 plugs and 2 gaskets. Remove the 30 bolts and nut shown in the illustration. Remove the timing chain cover by prying between the timing chain cover and cylinder head and cylinder block with a screwdriver as shown in the illustration. NOTE: Be careful not to damage the contact surfaces of the cylinder head, cylinder block and chain cover. HINT: Tape the screwdriver tip before use. Remove the oil pump gasket from the cylinder block. Remove the O-ring from the cylinder block.
67. REMOVE WATER INLET PIPE Remove the water inlet pipe. Remove the 2 O-rings from the water inlet pipe.

Scheme 266

1. REMOVE OIL PUMP COVER Remove the 13 bolts, oil pump cover, drive rotor and driven rotor.
2. REMOVE OIL PUMP RELIEF VALVE Using a 19 mm socket wrench, remove the relief valve plug. Remove the valve spring and oil pump relief valve.

Scheme 267

Scheme 268

Scheme 269

Scheme 270

Scheme 271

Scheme 272

1. INSPECT OIL PUMP RELIEF VALVE Coat the relief valve with engine oil. Check that it falls smoothly into the valve hole by its own weight. If it does not, replace the relief valve. If necessary, replace the timing chain cover assembly.
2. INSPECT OIL PUMP ROTOR SET Install the rotors to the timing chain cover with the rotors' marks facing outward. Check that the rotors revolve smoothly. Check the tip clearance. Using a feeler gauge, measure the clearance between the drive and driven rotor tips, as shown in the illustration. Standard tip clearance: 0.180 to 0.300 mm (0.0071 to 0.0118 in.) Maximum tip clearance: 0.300 mm (0.0118 in.) If the tip clearance is greater than the maximum, replace the timing chain cover assembly. Check the side clearance. Using a feeler gauge and steel square, measure the clearance between the rotors and steel square. Standard side clearance: 0.030 to 0.060 mm (0.0012 to 0.0024 in.) Maximum side clearance: 0.060 mm (0.0024 in.) If the side clearance is greater than the maximum, replace the timing chain cover assembly. Check the body clearance. Using a feeler gauge, measure the clearance between the timing chain cover and driven rotor, as shown in the illustration. Standard body clearance: 0.175 to 0.250 mm (0.0069 to 0.0098 in.) Maximum body clearance: 0.250 mm (0.0098 in.) If the body clearance is greater than the maximum, replace the timing chain cover assembly.

See also:
• DTC CHECK/CLEAR
• COOLANT
• REMOVAL
• REMOVAL
• REMOVAL
• REMOVAL
• INSTALLATION
• ON-VEHICLE INSPECTION
• REMOVAL
• REMOVAL
• REMOVAL