2003 LEXUS LS430 ignition

2.CHECK FOR DTCS
a. Separate the keys from each other. Or, remove the key ring.
b. Delete the DTC (see DTC CHECK/CLEAR
).
c. Insert a key into the ignition cylinder. Remove it. Repeat for all the other keys.
d. Check that no code is output.
NG: Go to step 3
OK: END
3.CHECK TRANSPONDER KEY ECU ASSY
a. Using an oscilloscope or the hand-held tester, check the waveform between the terminals of the T8
amplifier connector and T9 ECU connector. The waveform should be similar to the illustration .
OK: No noise present (see illustration ).
Fig. 40: Identifying Waveform

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WAVEFORM REFERENCE TABLE
TOOL SETTING REFERENCE TABLE
Tester connectionSpecified condition
T9-10 (CODE) - T8-4 (CODE)No noise is present

NG: FIND CAUSE OF NOISE AND REMOVE IT
OK: Go to next step
4.CHECK WIRE HARNESS (TRANSPONDER KEY ECU ASSY - TRANSPONDER KEY
AMPLIFIER)
a. Disconnect the T9 ECU connector.
b. Disconnect the T8 amplifier connector.
c. Measure the resistance of the wire harness side connectors.
Tool Setting10 V/DIV.,20 ms/DIV.
ConditionIgnition switch OFF --> ON

2.CHECK WIRE HARNESS (TRANSPONDER KEY ECU ASSY - BATTERY AND BODY
GROUND)
a. Disconnect the T9 ECU connector.
b. Measure the resistance and voltage of the wire harness side connector.
Fig. 46: Identifying T9 ECU Connector Terminals

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Standard:
TRANSPONDER KEY ECU - BATTERY AND BODY GROUND - RESISTANCE TABLE
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: REPLACE TRANSPONDER KEY ECU ASSY
Tester ConnectionSpecified ConditionCondition
T9-1 (CPUB) -Body groundAlways10 to 14V
T9-2 (IG2) - Body groundIgnition switch OFF --> ON0V --> 10 to 14 V
T9-14 (GND) -Body groundAlwaysBelow 1 ohms

Fig. 2: Identifying Proper Ribbed Grooves
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7.INSPECT IGNITION TIMING
a. Warm up the engine.
b. Check the ignition timing.
1. Connect the hand-held tester (with CAN VIM) to the DLC3.
2. Enter DATA LIST MODE on the hand-held tester.
Ignition timing 8 to 12° BTDC @ idle
HINT:
Please refer to the han
d<0010004b0048004f00470003005700480056005700480055000300520053004800550044005700520055000a0056000300500044005100580044004f00030049005200550003004b0048004f0053000300520051000300560048004f004800460057004c00
51[g the DATA LIST.

Fig. 3: Checking Ignition Timing Connecting Hand-Held Tester DLC3
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8.INSPECT ENGINE IDLE SPEED
a. Warm up the engine.
b. Check the idle speed.
1. Connect the hand-held tester (with CAN VIM) to the DLC3.
2. Enter DATA LIST MODE on the hand-held tester.
Idle speed: 700 to 800 rpm

Fig. 5: Checking Cylinder'S Compression Pressure
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HINT:
If adding oil increases the compression, the piston rings and/or cylinder bore may be worn or
damaged.
If pressure stays low, a valve may be stuck or seated improperly, or there may be leakage in
the gasket.
i. Connect the 8 injector connectors.
j. Install the spark plugs.
k. Install the 8 ignition coils.
l. Install the oil level gauge guide.
m. Connect the throttle control motor connector.
n. Install the air cleaner inlet and intake air pipe.
o. Install the V-bank cover.
10.INSPECT CO/HC
a. Start the engine.
b. Rev the engine at 2,500 rpm for approximately 180 seconds.

Fig. 48: Identifying Knock Sensor Connectors
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64.REMOVE ENGINE HANGER NO.1
65.REMOVE ENGINE HANGER NO.2
66.REMOVE IGNITION COIL ASSY
67.REMOVE OIL FILTER BRACKET SUB-ASSY
a. Disconnect the oil pressure switch connector.
b. Remove the stud bolt, 2 nuts and oil filter bracket with gasket.
68.REMOVE CRANKSHAFT POSITION SENSOR
69.REMOVE ENGINE OIL LEVEL SENSOR
70.REMOVE EXHAUST MANIFOLD HEAT INSULATOR NO.1
71.REMOVE EXHAUST MANIFOLD SUB-ASSY RH
a. Remove the 8 nuts, exhaust manifold and
gasket.

Fig. 58: Installing Exhaust Manifold
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85.INSTALL EXHAUST MANIFOLD HEAT INSULATOR NO.1
86.INSTALL ENGINE OIL LEVEL SENSOR
87.INSTALL CRANKSHAFT POSITION SENSOR (See REPLACEMENT
)
88.INSTALL OIL FILTER BRACKET SUB-ASSY
Torque: 18 N.m (184 kgf.cm, 13 ft.lbf)
89.INSTALL IGNITION COIL ASSY
Torque: 7.5 N.m (77 kgf.cm, 66 in.lbf)
90.INSTALL ENGINE HANGER NO.2
Torque: 37 N.m (377 kgf.cm, 27 ft.lbf)
91.INSTALL ENGINE HANGER NO. 1
Torque: 37 N.m (377 kgf.cm, 27 ft.lbf)
92.INSTALL KNOCK SENSOR
a. Install the 2 knock sensors with the 2 nuts, as shown in the illustration.
Torque: 20 N.m (204 kgf.cm, 15 ft.lbf)
b. Connect the 2 knock sensor connectors.