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Infiniti I35 (A33). Manual - part 182

REPLACE HEATED OXYGEN SENSOR 1

1. Stop engine.
2. Replace heated oxygen sensor 1 on the malfunctioning bank.

With CONSULT-II

GO TO 32.

Without CONSULT-II

GO TO 33.

CHECK HEATED OXYGEN SENSOR 1 (BANK 1)/(BANK 2) SIGNAL

With CONSULT-II

1. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
2. See “HO2S1 MNTR (B1)/(B2)” in “DATA MONITOR” mode.
3. Running engine at 2,000 rpm under no-load (The 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

OK or NG

GO TO 4.

GO TO 34.

CHECK HEATED OXYGEN SENSOR 1 (BANK 1)/(BANK 2) SIGNAL

Without CONSULT-II

1. Set ECM to Self-diagnostic mode II (Heated oxygen sensor 1 monitor). Refer to “How to Switch Diagnostic Test Mode”,

EC-91.

2. Switch the monitored sensor to the malfunctioning bank. Refer to “How to Switch Monitored Sensor from Bank 1 to

Bank 2 or Vice Versa”, EC-92.

3. Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that

the MIL comes on more than 5 times during 10 seconds.

OK or NG

GO TO 4.

GO TO 34.

DETECT MALFUNCTIONING PART

Check the following.

Check mass air flow sensor and its circuit, and repair or replace if necessary. Refer to EC-194.

Check injector and its circuit, and repair or replace if necessary. Refer to EC-696.

Check engine coolant temperature sensor and its circuit, and repair or replace if necessary. Refer to EC-206.

Check fuel pressure and repair or replace if necessary. Refer to EC-55.

OK or NG

GO TO 36.

1. Repair or replace.
2. GO TO 35.

ERASE UNNECESSARY DTC

After this inspection, unnecessary DTC might be displayed.
Erase the stored memory in ECM and TCM. Refer to “How to Erase Emission-related Diagnostic Information”, EC-88 and
AT-38.

GO TO 4.

IDX

BASIC SERVICE PROCEDURE

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

EC-69

CHECK ECM FUNCTION

1. Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but this is a rare

case.)

2. Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to “IVIS (INFINITI

VEHICLE IMMOBILIZER SYSTEM — NATS”, EC-90.

GO TO 4.

Accelerator Pedal Released Position Learning

NHEC1186

DESCRIPTION

NHEC1186S01

Accelerator Pedal Released Position Learning is an operation to learn the fully released position of the accel-
erator pedal by monitoring the accelerator pedal position sensor output signal. It must be performed each time
harness connector of accelerator pedal position sensor or ECM is disconnected.

OPERATION PROCEDURE

NHEC1186S02

1. Make sure that accelerator pedal is fully released.
2. Turn ignition switch ON and wait at least 2 seconds.
3. Turn ignition switch OFF wait at least 10 seconds.
4. Turn ignition switch ON and wait at least 2 seconds.
5. Turn ignition switch OFF wait at least 10 seconds.

Throttle Valve Closed Position Learning

NHEC1187

DESCRIPTION

NHEC1187S01

Throttle Valve Closed Position Learning is an operation to learn the fully closed position of the throttle valve
by monitorizing the throttle position sensor output signal. It must be performed each time harness connector
of electric throttle control actuator or ECM is disconnected.

OPERATION PROCEDURE

NHEC1187S02

1. Turn ignition switch ON.
2. Turn ignition switch OFF wait at least 10 seconds.

Make sure that throttle valve moves during above 10 seconds by confirming the operating sound.

Idle Air Volume Learning

NHEC1188

DESCRIPTION

NHEC1188S01

Idle Air Volume Learning is an operation to learn the idle air volume
that keeps each engine within the specific range. It must be per-
formed under any of the following conditions:

Each time electric throttle control actuator or ECM is replaced.

Idle speed or ignition timing is out of specification.

PREPARATION

NHEC1188S02

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, if the
parking brake is applied before the engine is started, the
headlamp will not be illuminated.

Steering wheel: Neutral (Straight-ahead position)

BASIC SERVICE PROCEDURE

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

EC-70

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

NHEC1188S03

With CONSULT-II

NHEC1188S0301

NOTE:
Before perform Idle Air Volume Learning, make sure that Accelera-
tor Pedal Released Position Learning and Throttle Valve Closed
Position Learning are completed.
If not, perform “Accelerator Pedal Released Position Learning”,
EC-70 and “Throttle Valve Closed Position Learning”, EC-70.
1.

Start engine and warm it up to normal operating temperature.

Check that all items listed under the topic “PREPARATION”
(previously mentioned) are in good order.

SEF217Z

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

SEF454Y

Touch “START” and wait 20 seconds.

MBIB0238E

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

Rev up the engine two or three times and make sure that idle
speed and ignition timing are within the specifications.

ITEM

SPECIFICATION

Idle speed

675

50 rpm (in P or N position)

Ignition timing

5° BTDC (in P or N position)

IDX

BASIC SERVICE PROCEDURE

Idle Air Volume Learning (Cont’d)

EC-71

Without CONSULT-II

NHEC1188S0302

NOTE:

It is better to count the time accurately with a clock.

It is impossible to switch the diagnostic mode when an
accelerator pedal position sensor circuit has a malfunc-
tion.

Start engine and warm it up to normal operating temperature.

Check that all items listed under the topic “PREPARATION”
(previously mentioned) are in good order.

Turn ignition switch OFF and wait at least 10 seconds.

Confirm that accelerator pedal is fully released, turn ignition
switch ON and wait 3 seconds.

Repeat the following procedure quickly five times within 5 sec-
onds.

Fully depress the accelerator pedal.

Fully release the accelerator pedal.

Wait 7 seconds, fully depress the accelerator pedal and keep
it for approx. 20 seconds until the MIL stops blinking and turns
ON.

Fully release the accelerator pedal within 3 seconds after the
MIL turns ON.

Start engine and let it idle.

Wait 20 seconds.

SEC897C

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

speed and ignition timing are within the specifications.

ITEM

SPECIFICATION

Idle speed

675

50 rpm (in P or N position)

Ignition timing

5° BTDC (in P or N position)

11. If idle speed and ignition timing are not within the specification,

Idle Air Volume Learning will not be carried out successfully. In
this case, find the cause of the incident by referring to the
Diagnostic Procedure below.

DIAGNOSTIC PROCEDURE

NHEC1188S04

If idle air volume learning cannot be performed successfully,
proceed as follows:
1.

Check that throttle valve is fully closed.

BASIC SERVICE PROCEDURE

Idle Air Volume Learning (Cont’d)

EC-72

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