DI0 DIAGNOSTICS EINE DIHD0 DTC P00 Igniter Circuit Malfunction (No.) DTC P05 Igniter Circuit Malfunction (No.) DTC P0 Igniter Circuit Malfunction (No.) DTC P5 Igniter Circuit Malfunction (No.) DTC P0 Igniter Circuit Malfunction (No.5) DTC P5 Igniter Circuit Malfunction (No.6) CIRCUIT DESCRIPTI A DIS (Direct Ignition System) has been adopted. The DIS improves the ignition timing accuracy, reduces highvoltage loss, and enhances the the overall reliability of the ignition system by eliminating the distributor. The DIS is a cylinder ignition system which ignites one cylinder with one ignition coil. In the cylinder ignition system, the one spark plug is connected to the end of the secondary winding. High voltage generated in the secondary winding is applied directly to the spark plug. The spark of the spark plug pass from the center elecrtode to the ground electrode. The ECM determines ignition timing and outputs the ignition signals (IGT) for each cylinder. ased on IGT signals, the power transistors in the igniter cuts off the current to the primary coil in the ignition coil is supplied to the spark plug that are connected to the end of the secondary coil. At the same time, the igniter also sends an ignition confirmation signal (IGF) as a failsafe measure to the ECM. DTC No. DTC Detecting Condition Trouble Area P00 P05 P0 P5 P0 P5 No IGF signal to ECM while engine is running Open or short in IGF or IGF and IGT 6 circuit from ignition coil with igniter No. No.6 ignition coil with igniter ECM 8
DIAGNOSTICS EINE DI WIRI DIAGRAM Ignition Coil and Igniter No. Y No. LR No. LO LY No. 5 ECM IGT IGT IGT IGT IGT5 IGT6 IGF (*): (*): R (*) R (*) (*) R (*) Noise Filter W W W W No.5 Y 6 G No.6 W W W W W W 5 W 6 WL 7 C G IG Sitch C G Engine Room J/ IH *: From Jan. 98 until Mar. 98 production *: From Mar. 98 production WL 6 C ED AM I W F9 FL LOCK F9 W attery A0565 8
DI INSPECTI PROCEDURE DIAGNOSTICS EINE HINT: If DTC P00 is displayed, check No. ignition coil with igniter circuit. If DTC P05 is displayed, check No. ignition coil with igniter circuit. If DTC P0 is displayed, check No. ignition coil with igniter circuit. If DTC P5 is displayed, check No. ignition coil with igniter circuit. If DTC P0 is displayed, check No.5 ignition coil with igniter circuit. If DTC P5 is displayed, check No.6 ignition coil with igniter circuit. If DTC P00, P5, P5, are output simultaneously, IGF circuit may be open or short. If DTC P05, P0, P0, are output simultaneously, IGF circuit may be open or short. Read freeze frame data using LEXUS handheld tester or OD II scan tool. ecause freeze frame records the engine conditions when the malfunction is detected, when troubleshooting it is useful for determining whether the vehicle was running or stopped, the engine warmed up or not, the airfuel ratio lean or rich, etc. at the time of the malfunction. Check spark plug and spark (See page DI57). Go to step. Check for open and short in harness and connector in IGF and IGT signal circuit between ECM and ignition coil with igniter (See page IN5). Repair or replace harness or connector. 8
DIAGNOSTICS EINE DI Disconnect ignition coil with igniter connector and check voltage between terminals IGF of ECM connector and body ground. IGF EX A00 (a) Remove the instrument panel under cover. (b) Disconnect the ignition coil with igniter connector. (c) Turn the ignition switch. Measure voltage between terminals IGF of the ECM connector and body ground. : Voltage:.5 5.5 V Replace ignition coil with igniter. Check and replace ECM (See page IN5). Check for open and short in harness and connector in IGT signal circuit between ECM and ignition coil with igniter (See page IN5). Repair or replace harness or connector. 5 Check voltage between terminals IGT 6 of ECM connector and body ground. IGT6 IGT5 IGT IGT IGT IGT A0607 Remove the instrument panel under cover. Measure voltage between terminals IGT 6 of the ECM connector and body ground when engine is cranked. : Voltage: More than 0. V and less than.5 V 85
DI DIAGNOSTICS EINE IGT IGT signal waveform 5 V/ Division GND Reference: INSPECTI USI OSCILLOSCOPE During cranking or idling, check waveform between terminals IGT 6 and E of the ECM connector. HINT: Correct waveform appears as sohwn, with rectangle waves. GND IGF 0 m sec./ Division A06097 Check and replace ECM (See page IN5). 6 Disconnect ignition coil with igniter connector and check voltage between terminals IGT 6 of ECM connector and body ground. IGT6 IGT5 IGT IGT IGT IGT A0607 (a) Remove the instrument panel under cover. (b) Disconnect the ignition coil with igniter connector. Measure voltage between terminals IGT 6 of the ECM connector and body ground when engine is cranked. : Voltage: More than 0. V and less than.5 V Check and replace ECM (See page IN5). 7 Check ignition coil with igniter power source circuit. START Disconnect the ignition coil with igniter connector. Measure voltage between terminal of ignition coil with igniter connector and body ground, when ignition switch is turned to and START position. : Voltage: 9 V E665 A076 A086 Repair ignition coil with igniter power sourcecircuit. 86
DIAGNOSTICS EINE DI5 8 Check for open and short in harness and connector between ignition switch and ignition coil with igniter (See page IN5). Repair or replace harness or connector. 9 Check EFI main relay (Marking: EFI) (See page SF58). Replace EFI main relay (marking: EFI). Replace ignition coil with igniter. 87