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Ignition: Diagnosis Lexus ES XV40

Ignition System 12 illustrations ~1009 words

ON-VEHICLE INSPECTION

Note. In this section, the terms "cold" and "hot" refer to the temperature of the coils. "Cold" means approximately -10°C (14°F) to 50°C (122°F). "Hot" means approximately 50°C (122°F) to 100°C (212°F).

Scheme 1

Scheme 1: ON-VEHICLE INSPECTION
Scheme 1: ON-VEHICLE INSPECTION

Scheme 2

Scheme 2
Scheme 2

Scheme 3

Scheme 3
Scheme 3

Scheme 4

Scheme 4
Scheme 4

Scheme 5

Scheme 5
Scheme 5

Scheme 6

Scheme 6
Scheme 6

Scheme 7

Scheme 7
Scheme 7

Scheme 8

Scheme 8
Scheme 8
  1. INSPECT IGNITION COIL ASSEMBLY Check for DTCs. NOTE: If any DTC is present, perform troubleshooting in accordance with the procedures for that DTC. Check that sparks occur. Remove the intake air surge tank (See «REMOVAL»(ref-283103-S33980036242008041700000) ). Remove the No. 1 surge tank stay (see «REMOVAL»(ref-283096-S09656872402008041700000) ). Disconnect the 6 ignition coil connectors and remove the 6 bolts and 6 ignition coils. (Scheme 1): Locating Ignition Coil Connectors Using a 16 mm (0.63 in.) plug wrench, remove the 6 spark plugs. (Scheme 2): Identifying Spark Plugs Disconnect the 6 fuel injector connectors. Install the spark plugs to each ignition coil, and connect the ignition coil connectors. (Scheme 3): Locating Fuel Injector Connectors Ground the spark plugs. Check if a spark occurs at each spark plug while the engine is being cranked. NOTE: Be sure to ground the spark plugs when checking. Replace the ignition coil if it receives an impact. Do not crank the engine for more than 2 seconds. (Scheme 4): Checking Ground Spark Plugs Perform the spark test according to the flowchart below. Check that the ignition coil connector is securely connected. Result RESULT REFERENCE Result Proceed to NG Connect securely OK Go to Next Step Perform a speak test on each ignition coil. Replace the ignition coil with a normal one. Perform the spark test again. Result RESULT REFERENCE Result Proceed to OK Replace Ignition coil NG Go to Next Step Check the power supply to the ignition coil. Turn the engine switch on (IG). Measure the voltage between the terminals of the wire harness side connector. Standard voltage STANDARD VOLTAGE SPECIFICATION Tester Connection Specified Condition 1 (+B) - 4 (GND) 9 to 14 V Result RESULT REFERENCE Result Proceed to NG Check wiring between engine switch and ignition coil OK Go to Next Step Measure the resistance of the crankshaft position sensor. (Scheme 5): Measuring Voltage Between Terminals Of Wire Harness Side Connector Standard resistance STANDARD RESISTANCE SPECIFICATION Temperature Specified Condition Cold 1,630 to 2,740 ohms Hot 2,065 to 3,225 ohms Result RESULT REFERENCE Result Proceed to NG Replace crankshaft position sensor OK Go to Next Step Check the IGT signal from the ECM. Result RESULT REFERENCE Result Proceed to NG Check ECM (See «DTC P0351 IGNITION COIL "A" PRIMARY / SECONDARY CIRCUIT; DTC P0352 IGNITION COIL "B" PRIMARY / SECONDARY CIRCUIT; DTC P0353 IGNITION COIL "C" PRIMARY / SECONDARY CIRCUIT; DTC P0354 IGNITION COIL "D" PRIMARY / SECONDARY CIRCUIT; DTC P0355 IGNITION COIL "E" PRIMARY / SECONDARY CIRCUIT; DTC P0356 IGNITION COIL "F" PRIMARY / SECONDARY CIRCUIT»(ref-283100-S21142187282008041700000) ) OK Repair wiring between ignition coil and ECM Using a 16 mm (0.63 in.) plug wrench, install the spark plugs. Torque: 18 N*m (184 kgf*cm, 13 ft.*lbf) see scheme 8: Identifying Spark Plugs Install the 6 ignition coils with the 6 bolts and connect the 6 ignition coil connectors. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) see scheme 9: Locating Ignition Coil Connectors Connect the 6 fuel injector connectors. Install the No. 1 surge tank stay (See «INSTALLATION»(ref-283096-S14851713452008041700000) ). Install the intake air surge tank (See «INSTALLATION»(ref-283103-S10245997082008041700000) ).
  2. INSPECT SPARK PLUG NOTE: Never use a wire brush for cleaning. Never attempt to adjust the electrode gap on a used spark plug. see scheme 10: Locating Fuel Injector Connectors Check the electrode. Using a megohmmeter, measure the insulation resistance. Standard insulation resistance: 10 Mohms or higher HINT: If the result is 10 MD or less, clean the plug and measure the resistance again. If a megohmmeter is not available, perform the following simple inspection instead. (Scheme 6): Measuring Insulation Resistance Alternative inspection method: Quickly accelerate the engine to 4,000 rpm 5 times. Remove the spark plugs. Visually check the spark plug. If the electrode is dry, the spark plug is functioning properly. If the electrode is damp, proceed to the next step. Check the spark plug for any damage to its threads and insulator. If there is damage, replace the spark plug. Require spark plug REQUIRE SPARK PLUG Manufacturer Spark plug type DENSO made FK20HR11 NOTE: Use only the listed spark plug or equivalent to ensure engine performance and smooth driveability. Check the spark plug electrode gap. Maximum electrode gap for a used spark plug: 1.4 mm (0.055 in.) If the gap is greater than the maximum, replace the spark plug. Electrode gap for a new spark plug: 1.0 to 1.1 mm (0.039 to 0.043 in.) (Scheme 7): Identifying Spark Plug Electrode Gap Clean the spark plugs. If the electrode has traces of wet carbon, clean the electrode with a spark plug cleaner and then dry it. Standard air pressure: 588 kPa (6 kgf*cm 2, 85 psi) Standard duration: 20 seconds or less (Scheme 8): Cleaning Spark Plugs HINT: Only use the spark plug cleaner when the electrode is free of oil. If the electrode has traces of oil, use gasoline to clean off the oil before using the spark plug cleaner.
Fig. 14: Identifying Ignition Coil Components With Torque Specification
Scheme 14: Identifying Ignition Coil Components With Torque Specification

Scheme 9

Scheme 9: REMOVAL
Scheme 9: REMOVAL

Scheme 10

Scheme 10
Scheme 10

Scheme 11

Scheme 11
Scheme 11
  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
  2. REMOVE COOL AIR INTAKE DUCT SEAL (See «REMOVAL»(ref-283093-S19183759882008041700000) )
  3. REMOVE ENGINE ROOM SIDE COVER LH (See «REMOVAL»(ref-283093-S19183759882008041700000) )
  4. REMOVE ENGINE ROOM SIDE COVER RH (See «REMOVAL»(ref-283093-S19183759882008041700000) )
  5. REMOVE FRONT SUSPENSION UPPER CENTER BRACE (See «REMOVAL»(ref-283090-S09785113182008041700000) )
  6. REMOVE V-BANK COVER SUB-ASSEMBLY (See «REMOVAL»(ref-283093-S19183759882008041700000) )
  7. DRAIN ENGINE COOLANT (See «COOLANT»(ref-283095-S36931409572008041700000) )
  8. REMOVE AIR CLEANER CAP SUB-ASSEMBLY (See «ON-VEHICLE INSPECTION»(ref-283100-S34966310792008041700000) )
  9. REMOVE INTAKE AIR SURGE TANK ASSEMBLY (See «REMOVAL»(ref-283103-S33980036242008041700000) )
  10. REMOVE NO. 1 SURGE TANK STAY Remove the bolt and disconnect the harness clamp. (Scheme 9): Locating Bolt And Harness Clamp Remove the bolt and No. 1 surge tank stay. (Scheme 10): Locating Bolt And No. 1 Surge Tank Stay
  11. REMOVE IGNITION COIL ASSEMBLY Disconnect the 6 ignition coil connectors. Remove the 6 bolts and 6 ignition coils. (Scheme 11): Locating Ignition Coils And Bolts

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