Infiniti I30 (A33). Manual - part 187

CHECK HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1) SIGNAL

With CONSULT-II

1. Stop engine.
2. Replace heated oxygen sensor 1 (front) (bank 1).
3. Start engine and warm it up to normal operating temperature.
4. Run engine at approx. 2,000 rpm for approx. 2 minutes under no-load.
5. See “HO2S1 MNTR (B1)” in “DATA MONITOR” mode.
6. Maintaining engine at 2,000 rpm under no-load (engine is warmed up to normal operating temperature.), check that the

monitor fluctuates between “LEAN” and “RICH” more than 5 times during 10 seconds.
1 time: RICH

→

LEAN

→

RICH

2 times: RICH

→

LEAN

→

RICH

→

LEAN

→

RICH

Without CONSULT-II

1. Stop engine.
2. Replace heated oxygen sensor 1 (front) (bank 1).
3. Start engine and warm it up to normal operating temperature.
4. Run engine at approx. 2,000 rpm for approx. 2 minutes under no-load.
5. Set voltmeter probe between ECM terminal 63 and ground.
6. Make sure that the voltage fluctuates between 0 - 0.3V and 0.6 - 1.0V more than 5 times during 10 seconds at 2,000

rpm.
1 time: 0 - 0.3V

→

0.6 - 1.0V

→

0 - 0.3V

2 times: 0 - 0.3V

→

0.6 - 1.0V

→

0 - 0.3V

→

0.6 - 1.0V

→

0 - 0.3V

OK or NG

INSPECTION END

GO TO 26.

DETECT MALFUNCTIONING PART

Check the following.

Check fuel pressure regulator. Refer to EC-50.

Check mass air flow sensor and its circuit. Refer to EC-152.

Check injector and its circuit. Refer to EC-608.
Clean or replace if necessary.

Check engine coolant temperature sensor and its circuit. Refer to EC-187.

Check ECM function by substituting another known-good ECM.
(ECM may be the cause of a problem, but this is rarely the case.)

GO TO 3.

CHECK HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1) HARNESS

1. Turn off engine and disconnect battery ground cable.
2. Disconnect ECM harness connector.
3. Disconnect heated oxygen sensor 1 (front) (bank 1) harness connector.
4. Check harness continuity between ECM terminal 63 and heated oxygen sensor 1 (front) (bank 1) harness connector

terminal 1.
Refer to Wiring Diagram, EC-195.

Continuity should exist.

OK or NG

GO TO 30.

GO TO 28.

IDX

BASIC SERVICE PROCEDURE

Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)

EC-63

CHECK HEATED OXYGEN SENSOR 1 (FRONT) (BANK 2) HARNESS

1. Turn off engine and disconnect battery ground cable.
2. Disconnect ECM harness connector.
3. Disconnect heated oxygen sensor 1 (front) (bank 2) harness connector.
4. Check harness continuity between ECM terminal 62 and heated oxygen sensor 1 (front) (bank 2) harness connector

terminal 1.
Refer to Wiring Diagram, EC-196.

Continuity should exist.

OK or NG

GO TO 30.

GO TO 29.

REPAIR OR REPLACE

Repair or replace harness between ECM and heated oxygen sensor 1 (front).

GO TO 3.

PREPARATION FOR “CO” % CHECK

With CONSULT-II

1. Reconnect ECM harness connector.
2. Turn ignition switch “ON”.
3. Select “ENG COOLANT TEMP” in “ACTIVE TEST” mode.
4. Set “ENG COOLANT TEMP” to 5°C (41°F) by touching “DWN” and “Qd”.

SEF172Y

Without CONSULT-II

1. Disconnect ECM harness connector.
2. Disconnect engine coolant temperature sensor harness connector.
3. Connect a resistor (4.4 k

Ω

) between terminals of engine coolant temperature sensor harness connector.

SEF982UA

GO TO 31.

BASIC SERVICE PROCEDURE

Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)

EC-64

CHECK “CO” %

1. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.

SEF976U

2. Rev engine (2,000 to 3,000 rpm) two or three times under no-load, then run engine at idle speed.

SEF978U

3. Check “CO” %.

Idle CO: 3 - 11%

Without CONSULT-II

After checking CO%,

a. Disconnect the resistor from terminals of engine coolant temperature sensor.
b. Connect engine coolant temperature sensor harness connector to engine coolant temperature sensor.

OK or NG

GO TO 32.

GO TO 33.

CHECK HEATED OXYGEN SENSOR 1 (FRONT) SIGNAL

With CONSULT-II

1. Stop engine.
2. Replace heated oxygen sensor 1 (front).
3. Start engine and warm it up to normal operating temperature.
4. Run engine at approx. 2,000 rpm for approx. 2 minutes under no-load.
5. See “HO2S1 MNTR (B1)/(B2)” in “DATA MONITOR” mode.
6. Maintaining engine at 2,000 rpm under no-load (engine is warmed up to normal operating temperature.), check that the

monitor fluctuates between “LEAN” and “RICH” more than 5 times during 10 seconds.
1 time: RICH

→

LEAN

→

RICH

2 times: RICH

→

LEAN

→

RICH

→

LEAN

→

RICH

Without CONSULT-II

1. Stop engine.
2. Replace heated oxygen sensor 1 (front).
3. Start engine and warm it up to normal operating temperature.
4. Run engine at approx. 2,000 rpm for approx. 2 minutes under no-load.
5. Set voltmeter probe between ECM terminal 63 or 62 and ground.
6. Make sure that voltage fluctuates between 0 - 0.3V and 0.6 - 1.0V more than 5 times during 10 seconds at 2,000 rpm.

1 time: 0 - 0.3V

→

0.6 - 1.0V

→

0 - 0.3V

2 times: 0 - 0.3V

→

0.6 - 1.0V

→

0 - 0.3V

→

0.6 - 1.0V

→

0 - 0.3V

OK or NG

GO TO 3.

GO TO 33.

IDX

BASIC SERVICE PROCEDURE

Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)

EC-65

DETECT MALFUNCTIONING PART

Check the following.

Connect heated oxygen sensor 1 (front) harness connectors to heated oxygen sensors 1 (front).

Check fuel pressure regulator. Refer to EC-50.

Check mass air flow sensor and its circuit. Refer to EC-152.

Check injector and its circuit. Refer to EC-608.
Clean or replace if necessary.

Check engine coolant temperature sensor and its circuit. Refer to EC-187.

Check ECM function by substituting another known-good ECM.
(ECM may be the cause of a problem, but this is rarely the case.)

GO TO 3.

SEF452Y

SEF454Y

SEF455Y

Idle Air Volume Learning

NHEC0642

DESCRIPTION

NHEC0642S01

“Idle Air Volume Learning” is an operation to learn the idle air vol-
ume that keeps each engine within the specific range. It must be
performed under any of the following conditions:

Each time IACV-AAC valve, throttle body or ECM is replaced.

Idle speed or ignition timing is out of specification.

PRE-CONDITIONING

NHEC0642S02

Before performing “Idle Air Volume Learning”, make sure that all of
the following conditions are satisfied.
Learning will be cancelled if any of the following conditions are
missed for even a moment.

Battery voltage: More than 12.9V (At idle)

Engine coolant temperature: 70 - 99°C (158 - 210°F)

PNP switch: ON

Electric load switch: OFF
(Air conditioner, headlamp, rear window defogger)

On vehicles equipped with daytime light systems, set lighting
switch to the 1st position to light only small lamps.

Cooling fan motor: Not operating

Steering wheel: Neutral (Straight-ahead position)

Vehicle speed: Stopped

Transmission: Warmed-up
For models with CONSULT-II, drive vehicle until “FLUID TEMP
SE” in “DATA MONITOR” mode of “A/T” system indicates less
than 0.9V.
For models without CONSULT-II, drive vehicle for 10 minutes.

OPERATION PROCEDURE

NHEC0642S03

With CONSULT-II

NHEC0642S0301

Turn ignition switch “ON” and wait at least 1 second.

Turn ignition switch “OFF” and wait at least 10 seconds.

Start engine and warm it up to normal operating temperature.

Check that all items listed under the topic “PRE-CONDITION-
ING” (previously mentioned) are in good order.

Turn ignition switch “OFF” and wait at least 10 seconds.

Start the engine and let it idle for at least 30 seconds.

Select “IDLE AIR VOL LEARN” in “WORK SUPPORT” mode.

Touch “START” and wait 20 seconds.

Make sure that “CMPLT” is displayed on CONSULT-II screen.
If “INCMP” is displayed, “Idle Air Volume Learning” will not be
carried out successfully. In this case, find the cause of the
problem by referring to the NOTE below.

10. Rev up the engine two or three times. Make sure that idle

BASIC SERVICE PROCEDURE

Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)

EC-66

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