DI0SD–16 DTC P1300 Igniter Circuit Malfunction

DI?270

DIAGNOSTICS ? ENGINE (5VZ?FE)

DI0SD?16

DTC

P1300 Igniter Circuit Malfunction

CIRCUIT DESCRIPTION

A Direct Ignition System (DIS) has been adopted. The DIS improves the ignition timing accuracy, reduces high?voltage loss, and enhances the overall reliability of the ignition system by eliminating the distributor. The DIS is a 2?cylinder simultaneous ignition system which ignites 2 cylinders simultaneously with 1 ignition coil. In the 2?cylinder simultaneous ignition system, each of the 2 spark plugs is connected to the end of the secondary winding. High voltage generated in the secondary winding is applied directly to the spark plugs. The sparks of the 2 spark plugs pass simultaneously from the center electrode to the ground electrode. The ECM determines ignition timing end outputs the ignition signals (IGT) for each cylinder. Based on IGT signals, the igniter controls the primary ignition signals (IGC) for all ignition coils. At the same time, the igniter also sends an ignition confirmation signal (IGF) as a fail?safe measure to the ECM.

From Battery Igniter

Camshaft

G

Position

Sensor

IGT1

IGC1

Ignition Coil Spark Plug

No. 1 Cylinder

No. 4 Cylinder

Crankshaft Position Sensor

NE

IGT2 ECM

IGC2

No. 2 Cylinder No. 5 Cylinder

Various Sensor

IGT3

IGC3

IGF

TAC GND To Tachometer

No. 3 Cylinder No. 6 Cylinder

S00251

DTC No. P1300

DTC Detection Condition

Condition (a) is repeated 3 times consecutively during 6 consecutively IGT signals while engine is running: (a) IGF signal is not input to ECM for 2 or more ignitions

Trouble Area

S Ignition system S Open or short in IGF or IGT circuit from igniter to ECM S Igniter S Ignition coil S ECM

2002 TOYOTA TACOMA (RM921U)

WIRING DIAGRAM

DIAGNOSTICS ? ENGINE (5VZ?FE)

B?R 17 IF1

1

IK2

B?R

I3

Ignition Spark

Coil

B?R

Plug GR

B?R Igniter

B?R 6

I14 Ignition Switch

10

I4 Ignition Coil B?R

7 W?R 2

2 1 AM2

G?Y

2 I5 Ignition Coil B?R

R/B No. 2

G 1

2

W Battery

W?B 3

EB

9

B?L 7

LG?R 6

B?W

5

B?Y

4

LG?B

8

To Tachometer

11 E7 IGT1

10 IGT2 E7

9 IGT3 E7 2 IGF E7

ECM

DI?271 5 V

A18392

INSPECTION PROCEDURE

HINT: Read freeze frame data using hand?held tester or OBD II scan tool, as freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air?fuel ratio was lean or rich, etc. at the time of the malfunction.

1 Check spark plug and spark of misfiring cylinder (See page DI?210).

NG Go to step 4. OK

2 Check for open and short in harness and connector in IGF signal circuit between ECM and igniter (See page IN?28).

2002 TOYOTA TACOMA (RM921U)

NG Repair or replace harness or connector.

DI?272 OK

DIAGNOSTICS ? ENGINE (5VZ?FE)

3 Disconnect igniter connector, and check voltage between terminal IGF of ECM connector and body ground.

IGF (+)

PREPARATION:

(a) Disconnect the igniter connector.

(b) Remove the glove compartment (See page SF?58).

(c) Turn the ignition switch ON.

CHECK:

Measure the voltage between terminal IGF of the ECM connec-

tor and the body ground.

OK:

A18845

Voltage: 4.5 ? 5.5 V

OK Replace igniter.

NG

Check and replace ECM (See page IN?28).

4 Check for open and short in harness and connector in IGT signal circuit between ECM and igniter (See page IN?28).

NG Repair or replace harness or connector. OK

5 Check voltage between terminals IGT1 ? IGT3 of ECM connector and body ground.

IGT2 (+)

IGT1 (+)

IGT3 (+)

PREPARATION: Remove the glove compartment (See page SF?58). CHECK: Measure the voltage between terminal IGT1 ? IGT3 of the ECM connector and body ground when the engine is cranked. OK:

Voltage: More than 0.1 V and less than 4.5 V

2002 TOYOTA TACOMA (RM921U)

A18845

DIAGNOSTICS ? ENGINE (5VZ?FE)

DI?273

IGT and IGF Signal Waveforms VOLT

5 0 5 0 5 0 5 0

20 msec./Division (Idling)

IGT1 IGT2 IGT3 IGF

P20870

Reference: INSPECTION USING OSCILLOSCOPE During idling, check the waveforms between terminals IGT1 ? IGT3 and E1, and IGF and E1 of the ECM connector. HINT: The correct waveforms are as shown.

NG Check and replace ECM (See page IN?28).

OK

6 Disconnect igniter connector, and check voltage between terminals IGT1 ? IGT3 of ECM connector and body ground.

IGT2 (+)

IGT1 (+)

IGT3 (+)

PREPARATION:

(a) Disconnect the igniter connector.

(b) Remove the glove compartment (See page SF?58).

CHECK:

Measure the voltage between terminals IGT1 ? IGT3 of the

ECM connector and the body ground when the engine is

cranked.

OK:

A18845

Voltage: More than 0.1 V and less than 5.0 V

NG Check and replace ECM (See page IN?28).

OK

7 Check voltage between terminal 9 of igniter connector and body ground.

ON START

BE6653 P24329

9 (+) (?)

PREPARATION: Disconnect the igniter connector. CHECK: Measure the voltage between terminal 9 of the igniter connector and the body ground when the ignition switch is turned to ON and START position. OK:

Voltage: 9 ? 14 V

A00124

NG Check and repair igniter power source circuit.

OK

2002 TOYOTA TACOMA (RM921U)

DI?274

DIAGNOSTICS ? ENGINE (5VZ?FE)

8 Check for open and short in harness and connector between ignition switch and ignition coil, and ignition coil and igniter (See page IN?28).

NG Repair or replace harness or connector. OK

9 Check ignition coil (See page IG?1). NG Replace ignition coil.

OK

Replace igniter.

2002 TOYOTA TACOMA (RM921U)

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