Infiniti I30. Emission Control System (2003 year). Manual - part 43

CHECK VACUUM EXISTENCE

With CONSULT-II

1. Stop engine and disconnect vacuum hose connected to power valve actuator.
2. Start engine and let it idle.
3. Perform “VIAS SOL VALVE” in “ACTIVE TEST” mode with CONSULT-II.
4. Turn VIAS control solenoid valve “ON” and “OFF”, and check for the existence of vacuum under the following condi-

tions.

SEC129D

MTBL1174

Without CONSULT-II

1. Stop engine and disconnect vacuum hose connected to power valve actuator.
2. Disconnect VIAS control solenoid valve harness connector.
3. Start engine and let it idle.
4. Apply 12V of direct current between VIAS control solenoid valve terminals 1 and 2.
5. Check for the existence of vacuum under the following conditions.

SEC130D

MTBL1175

OK or NG

䊳

Repair or replace power valve actuator.

䊳

GO TO 3.

IDX

VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)

Diagnostic Procedure (Cont’d)

EC-673

CHECK VACUUM HOSE

1. Stop engine.
2. Check hoses and tubes between intake manifold and power valve actuator for crack, clogging, disconnection or

improper connection.

SEF109L

OK or NG

䊳

GO TO 4.

䊳

Replace vacuum hose.

CHECK VACUUM TANK

1. Disconnect vacuum hose connected to vacuum tank.
2. Connect a vacuum pump to port (at the center) of vacuum tank.
3. Apply vacuum and make sure that vacuum exists at another port.

SEC131D

OK or NG

䊳

GO TO 5.

䊳

Replace vacuum tank.

VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)

Diagnostic Procedure (Cont’d)

EC-674

CHECK VIAS CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT

1. Stop engine.
2. Disconnect VIAS control solenoid valve harness connector.

SEC058D

3. Turn ignition switch “ON”.
4. Check voltage between terminal 1 and ground with CONSULT-II or tester.

SEF603X

OK or NG

䊳

GO TO 7.

䊳

GO TO 6.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors M229, F66

쐌

Fuse block (J/B) connector M19

쐌

15A fuse

쐌

Harness continuity between fuse and VIAS control solenoid valve

䊳

Repair harness or connectors.

CHECK VIAS CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 27 and terminal 2. Refer to Wiring Diagram.

Continuity should exist.

4. Also check harness for short to ground and short to power.

OK or NG

䊳

GO TO 8.

䊳

Repair open circuit or short to ground or short to power in harness or connectors.

IDX

VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)

Diagnostic Procedure (Cont’d)

EC-675

CHECK VIAS CONTROL SOLENOID VALVE

With CONSULT-II

1. Reconnect disconnected harness connector.
2. Turn ignition switch ON.
3. Perform “VIAS SOL VALVE” in “ACTIVE TEST” mode.
4. Check air passage continuity and operation delay time under the following conditions.

PBIB0177E

MTBL1301

Without CONSULT-II

Check air passage continuity and operation delay time under the following conditions.

MEC488B

MTBL1302

OK or NG

䊳

GO TO 9.

䊳

Replace VIAS control solenoid valve.

CHECK INTERMITTENT INCIDENT

Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-151.

䊳

INSPECTION END

VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)

Diagnostic Procedure (Cont’d)

EC-676

SEC120D

Component Description

NHEC0817

IGNITION COIL & POWER TRANSISTOR

NHEC0817S01

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.

IDX

IGNITION SIGNAL

Component Description

EC-677

Wiring Diagram

NHEC0819

MEC558D

IGNITION SIGNAL

Wiring Diagram

EC-678

MEC559D

IDX

IGNITION SIGNAL

Wiring Diagram (Cont’d)

EC-679

MEC560D

IGNITION SIGNAL

Wiring Diagram (Cont’d)

EC-680

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM’s transistor. Use a ground other than ECM terminals, such as the ground.

TERMI-

NAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

5
6
7

15
16
17

Y/R
G/R
L/R
GY
PU/W
GY/R

Ignition signal No. 1
Ignition signal No. 2
Ignition signal No. 3
Ignition signal No. 4
Ignition signal No. 5
Ignition signal No. 6

[Engine is running]

쐌

Warm-up condition

쐌

Idle speed

NOTE:
The pulse cycle changes depending on rpm at idle.

0 - 0.2V

★

SEC986C

[Engine is running]

쐌

Warm-up condition

쐌

Engine speed is 2,500 rpm.

0.1 - 0.3V

★

SEC987C

★

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Diagnostic Procedure

NHEC0820

CHECK ENGINE START

Turn ignition switch “OFF”, and restart engine.
Is engine running?

Yes or No

Yes (With CONSULT-II)

䊳

GO TO 2.

Yes (Without CONSULT-
II)

䊳

GO TO 3.

䊳

GO TO 4.

IDX

IGNITION SIGNAL

Wiring Diagram (Cont’d)

EC-681

CHECK OVERALL FUNCTION

With CONSULT-II

1. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-II.
2. Make sure that all circuits do not produce a momentary engine speed drop.

PBIB0133E

OK or NG

䊳

INSPECTION END

䊳

GO TO 14.

CHECK OVERALL FUNCTION

Without CONSULT-II

1. Let engine idle.
2. Read the voltage signal between ECM terminals 5, 6, 7, 15, 16, 17 and ground with oscilloscope.
3. Verify that the oscilloscope screen shows the signal wave as shown below.

NOTE:
The pulse cycle changes depending on rpm at idle.

SEC159D

OK or NG

䊳

INSPECTION END

䊳

GO TO 14.

IGNITION SIGNAL

Diagnostic Procedure (Cont’d)

EC-682

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I

1. Turn ignition switch ON.
2. Check voltage between ECM terminals 110, 112 and ground with CONSULT-II or tester.

SEF366X

OK or NG

䊳

GO TO 5.

䊳

Go to TROUBLE DIAGNOSIS FOR POWER SUPPLY, EC-152.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II

1. Check voltage between ECM terminal 31 and ground with CONSULT-II or tester.

SEC914C

Voltage: Battery voltage

OK or NG

䊳

GO TO 11.

䊳

GO TO 6.

IDX

IGNITION SIGNAL

Diagnostic Procedure (Cont’d)

EC-683

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III

1. Turn ignition switch OFF.
2. Disconnect ECM relay.

SEC044D

3. Check harness continuity between ECM relay terminal 31 and ECM relay terminal 7. Refer to Wiring Diagram.

Continuity should exist.

4. Also check harness for short to ground and short to power.

OK or NG

䊳

GO TO 8.

䊳

GO TO 7.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors E15, F18

쐌

Harness for open or short between ECM and ECM relay

䊳

Repair open circuit or short to ground or short to power in harness or connectors.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-IV

Check voltage between ECM relay terminal 6 and ground with CONSULT-II or tester.

SEF368X

OK or NG

䊳

GO TO 10.

䊳

GO TO 9.

DETECT MALFUNCTIONING PART

Check the following.

쐌

15A fuse

쐌

Harness for open and short between ECM relay and fuse

䊳

Repair or replace harness or connectors.

IGNITION SIGNAL

Diagnostic Procedure (Cont’d)

EC-684

CHECK ECM RELAY

1. Apply 12V direct current between ECM relay terminals 1 and 2.
2. Check continuity between ECM relay terminals 3 and 5, 6 and 7.

SEF296X

OK or NG

䊳

GO TO 19.

䊳

Replace ECM relay.

CHECK CONDENSER CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch “OFF”.
2. Disconnect condenser harness connector.
3. Check harness continuity between ECM terminal 31 and condenser terminal 1.

Refer to Wiring Diagram.

Continuity should exist.

4. Also check for short to ground and short to power.

OK or NG

䊳

GO TO 12.

䊳

Repair open circuit or short to ground or short to power in harness or connectors.

CHECK CONDENSER GROUND CIRCUIT FOR OPEN AND SHORT

1. Check harness continuity between condenser terminal 2 and engine ground. Refer to Wiring Diagram.

Continuity should exist.

2. Also check harness for short to power.

OK or NG

䊳

GO TO 13.

䊳

Repair open circuit or short to power in harness or connectors.

IDX

IGNITION SIGNAL

Diagnostic Procedure (Cont’d)

EC-685

CHECK CONDENSER

Check resistance between condenser terminals 1 and 2.

SEF369X

OK or NG

䊳

GO TO 14.

䊳

Replace condenser.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-V

1. Turn ignition switch OFF.
2. Reconnect harness connectors disconnected.
3. Disconnect ignition coil harness connector.

SEC120D

4. Turn ignition switch ON.
5. Check voltage between ignition coil terminal 3 and ground with CONSULT-II or tester.

SEF370X

OK or NG

䊳

GO TO 16.

䊳

GO TO 15.

IGNITION SIGNAL

Diagnostic Procedure (Cont’d)

EC-686

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors F57, F221

쐌

Harness for open and short between ignition coil and harness connector F18

䊳

Repair or replace harness or connectors.

CHECK IGNITION COIL GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.
2. Check harness continuity between ignition coil terminal 2 and engine ground. Refer to Wiring Diagram.

Continuity should exist.

3. Also check harness for short to power.

OK or NG

䊳

GO TO 17.

䊳

Repair open circuit or short to power in harness or connectors.

CHECK IGNITION COIL OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminals 5, 6, 7, 15, 16, 17 and ignition coil terminal 1. Refer to Wiring Dia-

gram.

Continuity should exist.

3. Also check harness for short to ground and short to power.

OK or NG

䊳

GO TO 18.

䊳

Repair open circuit or short to ground or short to power in harness or connectors.

CHECK IGNITION COIL WITH POWER TRANSISTOR

Check resistance between ignition coil terminals 2 and 3.

SEF371X

OK or NG

䊳

GO TO 19.

䊳

Replace ignition coil with power transistor.

CHECK INTERMITTENT INCIDENT

Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-151.

䊳

INSPECTION END

IDX

IGNITION SIGNAL

Diagnostic Procedure (Cont’d)

EC-687

SEF375Z

Component Description

NHEC0383

The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the injector circuit, the coil in the injector is
energized. The energized coil pulls the ball valve back and allows
fuel to flow through the injector into the intake manifold. The
amount of fuel injected depends upon the injection pulse duration.
Pulse duration is the length of time the injector remains open. The
ECM controls the injection pulse duration based on engine fuel
needs.

CONSULT-II Reference Value in Data Monitor
Mode

NHEC0384

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

INJ PULSE-B2
INJ PULSE-B1

쐌

Engine: After warming up

쐌

Air conditioner switch: “OFF”

쐌

Shift lever: “N”

쐌

No-load

Idle

2.0 - 3.0 msec

2,000 rpm

1.9 - 2.9 msec

B/FUEL SCHDL

ditto

Idle

2.3 - 2.9 msec

2,000 rpm

2.3 - 2.9 msec

INJECTOR

Component Description

EC-688

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