1991 LEXUS SC400 Service Repair Manual

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Page 2089 of 4087

LEXUS SC400 1991 Service Repair Manual DESCRIPTION The ECU is programmed with data for optimum ignition timing under any and a\ ll operating conditions. Using data provided by sensors which monitor various engine functions (rpm, i\ ntake

Page 2090 of 4087

LEXUS SC400 1991 Service Repair Manual PRECAUTIONS 1. Do not leave the ignition switch on for more than 10minutes if the engine will not start. 2. With a tachometer connected to the system, connect the tester probe of the tachometer to

Page 2091 of 4087

LEXUS SC400 1991 Service Repair Manual SYSTEM CIRCUIT OPERATION To maintain the most appropriate ignition timing, the ECU sends a control \ signal so that the igniter sends current to the ignition coil and the spark plugs produce a spark.

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LEXUS SC400 1991 Service Repair Manual PREPARATION SST (SPECIAL SERVICE TOOLS) RECOMMENDED TOOLS EQUIPMENT Part NameNote Engine tune±up testerIgnition timing Megger (Insulation resistance meter)Spark plug Spark plug cleaner Torque wrench

Page 2093 of 4087

LEXUS SC400 1991 Service Repair Manual ON±VEHICLE INSPECTION SPARK TEST CHECK THAT SPARK OCCURS(a) Remove the No.3 timing belt covers.(See steps 2 to 8 on pages IG±11 to 13) (b) Disconnect the high±tension cords (from the ignition

Page 2094 of 4087

LEXUS SC400 1991 Service Repair Manual INSPECTION OF HIGH±TENSION CORDS 1. REMOVE HIGH±TENSION CORDS(See steps 1 to 9 on pages IG±11 to 14) 2. INSPECT HIGH±TENSION CORD RESISTANCE Using an ohmmeter, measure the resistance. Maximum

Page 2095 of 4087

LEXUS SC400 1991 Service Repair Manual 4. VISUALLY INSPECT SPARK PLUGSCheck the spark plug for thread damage and insulator dam- age. If abnormal, replace the spark plug. Recommended spark plug: ND PK20R11 NGK BKR6EP11 5. INSPECT ELECT

Page 2096 of 4087

LEXUS SC400 1991 Service Repair Manual INSPECTION OF IGNITION COIL 1. (RH IGNITION COIL)REMOVE IGNITION COIL (See page IG±21) 2. (LH IGNITION COIL) DISCONNECT IGNITION COIL CONNECTOR AND HIGH± TENSION CORD FROM IGNITION COIL 3. INSPE
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