Infiniti M45 (Y34). Manual — part 338
BASIC SERVICE PROCEDURE
EC-41
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22.
CHECK HEATED OXYGEN SENSOR 1 (BANK 2) SIGNAL
Without CONSULT-II
1.
Switch the monitored sensor from bank 1 to bank 2. Refer to
EC-66, "How to Switch Monitored Sensor
from Bank 1 to Bank 2 or Vice Versa"
2.
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
OK
>> INSPECTION END
NG (MIL does not come on)>>GO TO 24.
NG (MIL comes on less than 5 times)>>GO TO 31.
23.
CHECK HEATED OXYGEN SENSOR 1 (BANK 1) HARNESS
1.
Turn ignition switch OFF and disconnect battery ground cable.
2.
Disconnect ECM harness connector.
3.
Disconnect heated oxygen sensor 1 (bank 1) harness connector.
4.
Check harness continuity between ECM terminal 114 and heated oxygen sensor 1 (bank 1) terminal 1.
Refer to Wiring Diagram,
5.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 25.
NG
>> 1. Repair or replace harness between ECM and heated oxygen sensor 1 (bank 1).
2. GO TO 4.
24.
CHECK HEATED OXYGEN SENSOR 1 (BANK 2) HARNESS
1.
Turn ignition switch OFF and disconnect battery ground cable.
2.
Disconnect ECM harness connector.
3.
Disconnect heated oxygen sensor 1 (bank 2) harness connector.
4.
Check harness continuity between ECM terminal 115 and heated oxygen sensor 1 (bank 2) terminal 1.
Refer to Wiring Diagram,
5.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 25.
NG
>> 1. Repair or replace harness between ECM and heated oxygen sensor 1 (bank 2).
2. GO TO 4.
25.
PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1.
Reconnect ECM harness connector and heated oxygen sensor 1 harness connector.
2.
Perform
EC-44, "Accelerator Pedal Released Position Learning"
>> GO TO 26.
26.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform
EC-44, "Throttle Valve Closed Position Learning"
>> GO TO 27.
Continuity should exist.
Continuity should exist.
EC-42
BASIC SERVICE PROCEDURE
27.
PERFORM IDLE AIR VOLUME LEARNING
Refer to
EC-44, "Idle Air Volume Learning"
Is Idle Air Volume Learning carried out successfully?
Yes or No
Yes (With CONSULT-II)>>GO TO 28.
Yes (Without CONSULT-II)>>GO TO 29.
No
>> 1. Follow the instruction of Idle Air Volume Learning.
2. GO TO 4.
28.
CHECK CO%
With CONSULT-II
1.
Start engine and warm it up until engine coolant temperature indicator points the middle of gauge.
2.
Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
3.
Select “ENG COOLANT TEMP” in “ACTIVE TEST” mode.
4.
Set “ENG COOLANT TEMP” to 5
°
C (41
°
F) by touching “DOWN”
and “Qd”.
5.
Start engine and rev it (2,000 to 3,000 rpm) two or three times
under no load, then run engine at idle speed.
6.
Check CO%.
OK or NG
OK
>> GO TO 31.
NG
>> GO TO 30.
29.
CHECK CO%
Without CONSULT-II
1.
Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
2.
Turn ignition switch OFF.
3.
Disconnect engine coolant temperature sensor harness connector.
4.
Connect a resistor (4.4 k
Ω
) between terminals of engine coolant
temperature sensor harness connector.
5.
Start engine and rev it (2,000 to 3,000 rpm) two or three times
under no load, then run engine at idle speed.
6.
Check CO%.
7.
After checking CO%, turn ignition switch OFF, disconnect the
resistor from the terminals of engine coolant temperature sensor
harness connector, and then connect engine coolant tempera-
ture sensor harness connector to engine coolant temperature
sensor.
OK or NG
OK
>> GO TO 31.
NG
>> GO TO 30.
30.
RECONNECT HEATED OXYGEN SENSOR 1 HARNESS CONNECTOR
1.
Turn ignition switch OFF.
2.
Reconnect heated oxygen sensor 1 harness connector.
>> GO TO 34.
Idle CO:
0.7
−
9.9% and engine runs smoothly.
SEF172Y
Idle CO:
0.7
−
9.9% and engine runs smoothly.
SEF982UA
BASIC SERVICE PROCEDURE
EC-43
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31.
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.
32.
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 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.
OK or NG
OK >> GO
TO
4.
NG
>> GO TO 34.
33.
CHECK HEATED OXYGEN SENSOR 1 (BANK 1) / (BANK 2) SIGNAL
Without CONSULT-II
1.
Set ECM to Self Diagnostic Test Mode II (Heated oxygen sensor 1 monitor). Refer to
2.
Switch the monitored sensor to the malfunctioning bank. Refer to
EC-66, "How to Switch Monitored Sen-
sor from Bank 1 to Bank 2 or Vice Versa"
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
OK
>> GO TO 4.
NG
>> GO TO 34.
34.
DETECT MALFUNCTIONING PART
Check the following.
●
Check fuel pressure regulator and repair or replace if necessary. Refer to
●
Check mass air flow sensor and its circuit, and repair or replace if necessary. Refer to
.
●
Check injector and its circuit, and repair or replace if necessary. Refer to
●
Check engine coolant temperature sensor and its circuit, and repair or replace if necessary. Refer to
and
OK or NG
OK
>> GO TO 36.
NG
>> 1. Repair or replace.
2. GO TO 35.
1 time:
RICH
→
LEAN
→
RICH
2 times:
RICH
→
LEAN
→
RICH
→
LEAN
→
RICH
SEF449Y
EC-44
BASIC SERVICE PROCEDURE
35.
ERASE UNNECESSARY DTC
After this inspection, unnecessary DTC might be displayed.
Erase the stored memory in ECM and TCM. Refer to
EC-62, "HOW TO ERASE EMISSION-RELATED DIAG-
and
>> GO TO 4.
36.
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
BL-174, "ECM Re-Communicating Function"
>> GO TO 4.
Accelerator Pedal Released Position Learning
ABS002DB
DESCRIPTION
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
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 and wait at least 10 seconds.
4.
Turn ignition switch ON and wait at least 2 seconds.
5.
Turn ignition switch OFF and wait at least 10 seconds.
Throttle Valve Closed Position Learning
ABS002DC
DESCRIPTION
Throttle Valve Closed Position Learning is an operation to learn the fully closed position of the throttle valve by
monitoring 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
1.
Make sure that accelerator pedal is fully released.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
Make sure that throttle valve moves during above 10 seconds by confirming the operating sound.
Idle Air Volume Learning
ABS002DD
DESCRIPTION
Idle Air Volume Learning is an operation to learn the idle air volume that keeps each engine within the specific
range. It must be performed 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
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)
●
Park/neutral position (PNP) switch: ON
●
Electric load switch: OFF
(Air conditioner, headlamp, rear window defogger)
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