DTC P1300 Igniter Circuit Malfunction No.1. DTC P1310 Igniter Circuit Malfunction No.2

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1 DIAGNOSTICS EINE (5SFE) DI63 DI0G06 DTC P300 Igniter Circuit Malfunction No. DTC P30 Igniter Circuit Malfunction No.2 CIRCUIT DESCRIPTION The ECM determines the ignition timing, turns on Tr at a predetermined angle ( CA) before the desired ignition timing and outputs and ignition signal (IGT) to the igniter. Since the width of the IGT signal is constant, the dwell angle control circuit in the igniter determines the time the control circuit starts primary current flow to the ignition coil based on the engine rpm and ignition timing one revolution ago, that is, the time the Tr2 turns on. When it reaches the ignition timing, the ECM turns Tr off and outputs the IGT signal O. This turns Tr2 off, interrupting the primary current flow and generating a high voltage in the secondary coil which causes the spark plug to spark. Also, by the counter electromotive force generated when the primary current is interrupted, the igniter sends an ignition confirmation signal () to the ECM. The ECM stops fuel injection as a fail safe function when the signal is not input to the ECM. DTC No. DTC Detecting Condition Trouble Area P300 No signal to ECM for 4 consecutive IGT signals during engine running Open or short in or IGT circuit from igniter to ECM Ignition coil No. (Igniter No.) ECM P30 No signal to ECM for 4 consecutive IGT2 signals during engine running Open or short in or IGT circuit from igniter to ECM Ignition coil No.2 (Igniter No.2) ECM HINT: Ignition coil No. is for cylinder No. and No.4, and ignition coil No.2 is for cylinder No.2 and No

2 DI64 DIAGNOSTICS EINE (5SFE) WIRI DIAGRAM IG Switch 7 6 R F6 WR FL lock F4 G MAIN FL attery 2A 5 K Instrument Panel J/ AM2 5 Engine Room J/ No.2 *: w/o Immobiliser *2: w/ Immobiliser 4 2L 3 II3 WR J9 J/C R R J25 J/C A EC A A R R R 4 Spark Plug R Igniter R No. Tr2 4 Spark Plug Igniter No.2 Tr2 Ignition Coil No.2 Ignition Coil No WR WR YR WR 23 (*2) 22 7 (*2) ECM 5 V 20 IGT Tr (*) 9 IGT2 Tr 3 (*) A0722 INSPECTION PROCEDURE HINT: If DTC P300 is displayed, check ignition coil No. circuit. If DTC P300 is displayed, check ignition coil No.2 circuit. Read freeze frame data using TOYOTA 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 for spark plug and spark of misifining cylinder (See page DI89 ). Go to step 4. 2 Check for open and short in harness and connector in signal circuit between ECM and ignition coils (See page IN3 ). Repair or replace harness or connector. 399

3 DIAGNOSTICS EINE (5SFE) DI65 3 Disconnect ignition coil connectors, and check voltage between terminal of ECM connector and body ground. ON w/o Immobiliser (+) w/ Immobiliser (a) Disconnect the ignition coil connector. (b) Remove the glove compartment (See page SF64 ). (c) Turn the ignition switch ON. Measure voltage between terminal of the ECM connector and body ground. : Voltage: V Replace ignition coil. A0047 A03023 (+) A03427 Check and replace ECM (See page IN3 ). 4 Check for open and short in harness and connector in IGT, 2 signal circuit between ECM and ignition coils (See page IN3 ). Repair or replace harness or connector. 400

4 DI66 DIAGNOSTICS EINE (5SFE) 5 Check voltage between terminals IGT, 2 of ECM connector and body ground. START w/o Immobiliser Remove the glove compartment (See page SF64 ). Measure voltage between terminal IGT, 2 of the ECM connector and body ground when the engine is cranked. : Voltage: More than 0. V and less than 4.5 V w/ Immobiliser IGT (+) A03024 IGT (+) A03428 Reference: INSPECTION USI OSCILLOSCOPE IGT 0 V 0 V IGT Signal Waveform 2 V/ Division During idling, check waveform between terminals IGT, 2 and E of the ECM. HINT: The correct waveforms are as shown. 0 msec./division (Idling) FI6680 Check and replace ECM (See page IN3 ). 40

5 DIAGNOSTICS EINE (5SFE) DI67 6 Disconnect ignition coil connectors, and check voltage between terminals IGT, 2 of ECM connector and body ground. START w/o Immobiliser (a) Disconnect the ignition coil connectors. (b) Remove the glove compartment (See page SF64 ). Measure voltage between terminals IGT, 2 of the ECM connector and body ground when the engine is cranked. : Voltage: More than 0. V and less than 5 V w/ Immobiliser IGT (+) Replace ignition coil. A03024 IGT (+) A Check ignition coil with igniter power source circuit. E6653 A076 ON START (+) A086 Disconnect the ignition coil connector. Measure voltage between terminal of the ignition coil with the igniter connector and body ground when the ignition switch is turned to ON and STA position. : Voltage: 9 4 V Repair ignition coil with igniter power source circuit. 402

6 DI68 DIAGNOSTICS EINE (5SFE) 8 Check for open and short in harness and connector between ignition switch and ignition coils (See page IN3 ). Repair or replace harness or connector. 9 Check ignition coil (See page IG5 ). Replace ignition coil. 0 Check EFI main relay (Marking: EFI) (See page SF40 ). Replace EFI main relay. Replace igniter. 403