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DI­114

DIAGNOSTICS ­ ENGINE

DI3HD­05

DTC

P1300

Igniter Circuit Malfunction (No.1)

DTC

P1305

Igniter Circuit Malfunction (No.2)

DTC

P1310

Igniter Circuit Malfunction (No.3)

DTC

P1315

Igniter Circuit Malfunction (No.4)

CIRCUIT DESCRIPTION

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 1­cylinder ignition system which ignites one cylinder with one ignition coil. In the 1­cylinder 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. Based 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. P1300 P1305 P1310 P1315 DTC Detecting Condition Trouble Area S Ignition system S Open or short in IGF1 and IGT1 4 circuit from ignition coil with igniter S No.1 No.4 ignition coil with igniter S ECM

No IGF signal to ECM while engine is running

2000 CELICA (RM744U)

DI­115

DIAGNOSTICS ­ ENGINE

WIRING DIAGRAM

Engine Room J/B 32 2C 31 IG2 Relay 3 5 B­O 6 IC Instrument Panel J/B 4 IK 6 B­O IG2 Ignition Switch AM2 5 B­R 11 IK AM2 Instrument Panel J/B 9 IC B­R B­R 16 2F 1 2A 11 2C B 1 2 C FL MAIN 7 2H 4 2G W­B C W­B Battery EB EC J2 J/C

W­B

ECM B­Y

Ignition Coil and Igniter No. 1

25 E5 IGF R­B W­B 10 E5 IGT1

2C 23 2C 30 2C 25 2C

B­Y 2 B 1

3 4

14 2F

1

2

Ignition Coil and Igniter No. 2

B­Y 2 B 1

3 4

R­W W­B

11 E5 IGT2

IG2

13 2C 24 2C

Ignition Coil and Igniter No. 3

B­Y 2 B 1

3 4

G­R W­B

12 E5 IGT3

Ignition Coil and Igniter No. 4 12 3 R­Y B­Y 2 2C 26 B 1 4 W­B 2C

13 E5 IGT4

C C C C

W­B

A09124

2000 CELICA (RM744U)

DI­116

DIAGNOSTICS ­ ENGINE

INSPECTION PROCEDURE

HINT:

S S S S S

If DTC P1300 is displayed, check No.1 ignition coil with igniter circuit. If DTC P1305 is displayed, check No.2 ignition coil with igniter circuit. If DTC P1310 is displayed, check No.3 ignition coil with igniter circuit. If DTC P1315 is displayed, check No.4 ignition coil with igniter circuit. Read freeze frame data using TOYOTA hand­held tester or OBD II scan tool. Because 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.

1

Check spark plug and spark (See page DI­64).

NG

Go to step 4.

OK

2

Check for open and short in harness and connector in IGF and IGT signal circuit between ECM and ignition coil with igniter (See page IN­30).

NG

Repair or replace harness or connector.

OK

3

Disconnect ignition coil with igniter connector and check voltage between terminals IGF of ECM connector and body ground.

ON

IGF

A09084 A09092

PREPARATION: (a) Remove the ECM cover. (b) Disconnect the ignition coil with igniter connector. (c) Turn the ignition switch ON. CHECK: Measure voltage between terminals IGF of the ECM connector and body ground. OK: Voltage: 4.5 ­ 5.5 V OK Replace ignition coil with igniter.

NG

2000 CELICA (RM744U)

DI­117

DIAGNOSTICS ­ ENGINE

Check and replace ECM (See page IN­30).

4

Check for open and short in harness and connector in IGT signal circuit between ECM and ignition coil with igniter (See page IN­30).

NG

Repair or replace harness or connector.

OK

5

Check voltage between terminals IGT1 4 of ECM connector and body ground.

ON IGT3 IGT1

PREPARATION: Remove the ECM cover. CHECK: Measure voltage between terminals IGT1 ­ 4 of the ECM connector and body ground when engine is cranked. OK: Voltage: More than 0.1 V and less than 4.5 V

A09092

IGT4

A09084

IGT2

IGT signal waveform

5 V/ Division

IGT GND GND IGF 20 m sec./ Division

A06097

Reference: INSPECTION USING OSCILLOSCOPE During cranking or idling, check waveform between terminals IGT1 ­ 4 and E1 of the ECM connector. HINT: Correct waveform appears as sohwn, with rectangle waves.

NG

Check and replace ECM (See page IN­30).

OK

2000 CELICA (RM744U)

DI­118

DIAGNOSTICS ­ ENGINE

6

Disconnect ignition coil with igniter connector and check voltage between terminals IGT1 4 of ECM connector and body ground.

ON IGT3 IGT1

IGT4

A09084

IGT2

A09092

PREPARATION: (a) Remove the ECM cover. (b) Disconnect the ignition coil with igniter connector. CHECK: Measure voltage between terminals IGT1 ­ 4 of the ECM connector and body ground when engine is cranked. OK: Voltage: More than 0.1 V and less than 4.5 V NG Check and replace ECM (See page IN­30).

OK

7

Check ignition coil with igniter power source circuit.

ON 1 (+) START

PREPARATION: Disconnect the ignition coil with igniter connector. CHECK: Measure voltage between terminal 1 of ignition coil with igniter connector and body ground, when ignition switch is turned to "ON" and "START" position. OK: Voltage: 9 ­ 14 V

A01861

BE6653 A01761

NG

Repair ignition coil with igniter power sourcecircuit.

OK

8

Check for open and short in harness and connector between ignition switch and ignition coil with igniter (See page IN­30).

NG

Repair or replace harness or connector.

OK

2000 CELICA (RM744U)

DI­119

DIAGNOSTICS ­ ENGINE

9

Check EFI main relay (Marking: EFI) (See page SF­52).

NG

Replace EFI main relay (marking: EFI).

OK

Replace ignition coil with igniter.

2000 CELICA (RM744U)

Information

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