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IGNITION SIGNAL EC-469 < DTC/CIRCUIT DIAGNOSIS > [VK56DE] C D E F G H I J K L M A EC N P O IGNITION SIGNAL Component Description INFOID:0000000009886922 IGNITION COIL & POWER TRANSISTOR The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns ON and OFF the ignition coil primary circuit. This ON/OFF operation induces the proper high voltage in the coil secondary circuit. Diagnosis Procedure INFOID:0000000009886923 1. CHECK ENGINE START Turn ignition switch OFF, and restart engine. Is engine running? Yes (With CONSULT)>>GO TO 2. Yes (Without CONSULT)>>GO TO 3. No >> GO TO 4. 2. CHECK OVERALL FUNCTION With CONSULT 1. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT. 2. Make sure that each circuit produces a momentary engine speed drop. OK >> INSPECTION END NG >> GO TO 10. 3. CHECK OVERALL FUNCTION Without CONSULT 1. Let engine idle. 2. Read the voltage signal between ECM terminals 46, 60, 61, 62, 65, 79, 80, 81 and ground with an oscilloscope. 3. Verify that the oscilloscope screen shows the signal wave as shown below. NOTE: The pulse cycle changes depending on rpm at idle. OK or NG 1. Ignition coils (with power transistor) 2. Ignition coils (with power transistor) BBIA0777E PBIB2094E PBIB0044E |