Infiniti Q45 (FY33). Manual — part 191
DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK HOSE.
Check vacuum hose for clogging and
improper connection. Refer to “Vacuum
Hose Drawing”, EC-19.
OK
E
NG
Repair or replace vacuum
hose.
CHECK EXHAUST SYSTEM.
Check exhaust system for collapse.
OK
E
NG
Repair or replace exhaust
system.
CHECK ORIFICE.
Make sure orifice is installed in vacuum
hose between EGRC-BPT valve and
EGRC-solenoid valve.
OK
E
NG
Replace vacuum hose.
CHECK COMPONENT
(EGRC-BPT valve).
Refer to “COMPONENT INSPECTION” on
next page.
OK
E
NG
Replace EGRC-BPT valve.
CHECK COMPONENT
(Camshaft position sensor).
Refer to “COMPONENT INSPECTION”,
EC-280.
OK
E
NG
Replace camshaft position
sensor.
CHECK COMPONENT
(Mass air flow sensor).
Refer to “COMPONENT INSPECTION”,
EC-131.
OK
E
NG
Replace mass air flow sen-
sor.
CHECK COMPONENT
(EGRC-solenoid valve).
Refer to “COMPONENT INSPECTION”,
EC-288.
OK
E
NG
Replace EGRC-solenoid
valve.
CHECK COMPONENT
(EGR valve).
Refer to “COMPONENT INSPECTION”,
EC-288.
OK
E
NG
Repair or replace EGR
valve.
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.
INSPECTION END
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0402
EGRC-BPT Valve Function (Cont’d)
H
H
H
H
H
H
H
H
H
H
EC-293
SEF172P
COMPONENT INSPECTION
EGRC-BPT valve
1.
Plug one of two ports of EGRC-BPT valve.
2.
Vacuum from the other port and check leakage without apply-
ing any pressure from under EGRC-BPT valve.
Leakage should exist.
TROUBLE DIAGNOSIS FOR DTC P0402
EGRC-BPT Valve Function (Cont’d)
EC-294
SEF184UG
Three Way Catalyst Function (P0420: Left
bank), (P0430: Right bank)
ON BOARD DIAGNOSIS LOGIC
ECM monitors the switching frequency ratio of heated oxygen sen-
sor 1 (front) and 2 (rear).
A three way catalyst with high oxygen storage capacity will indicate
a low switching frequency of heated oxygen sensor 2 (rear). As
oxygen storage capacity decreases, the heated oxygen sensor 2
(rear) switching frequency will increase.
When the frequency ratio of heated oxygen sensor 1 (front) 2 (rear)
approaches a specified limit value, the three way catalyst malfunc-
tion is diagnosed.
Diagnostic Trouble
Code No.
Malfunction is detected when ...
Check Items
(Possible Cause)
P0420
0702
(Bank 1)
I
Three way catalyst does not operate properly.
I
Three way catalyst does not have enough oxygen storage
capacity.
I
Three way catalyst
I
Exhaust tube
I
Intake air leaks
I
Injectors
I
Injector leaks
I
Spark plug
I
Improper ignition timing
P0430
0703
(Bank 2)
SEC047C
PEF215U
DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.
1) Start engine and drive vehicle at a speed of more than
70 km/h (43 MPH) for 2 consecutive minutes.
2) Stop vehicle with engine running.
3) Set “MANU TRIG” and “HI SPEED”, then select
“HO2S1 (B1) (B2)”, “HO2S2 (B1) (B2)”, “HO2S1 MNTR
(B1) (B2)”, “HO2S2 MNTR (B1) (B2)” in “DATA MONI-
TOR” mode with CONSULT-II.
4) Touch “RECORD” on CONSULT-II screen with engine
speed held at 2,000 rpm constantly under no load.
5) Make sure that the switching frequency between “RICH”
and “LEAN” of “HO2S2 MNTR (B1) (B2)” is much less
than that of “HO2S1 MNTR (B1) (B2)” as shown below.
Switching frequency ratio =
Heated oxygen sensor 2 (rear) switching fre-
quency
Heated oxygen sensor 1 (front) switching fre-
quency
This ratio should be less than 0.75.
If the ratio is greater than above, the three way catalyst
is not operating properly.
If the “HO2S1 MNTR (B1) (B2)” does not indicate
“RICH” and “LEAN” periodically more than 5 times
within 10 seconds at step 4), perform TROUBLE
DIAGNOSES FOR DTC P0133 first.
If
the
result
is
NG,
go
to
“DIAGNOSTIC
PROCEDURE”, EC-297.
If the result is OK, go to following step.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0420 (B1), P0430 (B2)
EC-295
6) Select “AUTO TRIG” in “DATA MONITOR” mode with
CONSULT-II.
7) Drive vehicle at a speed more than 84 to 96 km/h (52
to 60 MPH) with D position (“OD” ON) for at least 10
consecutive minutes.
(Drive the vehicle in an area where vehicle speed and
accelerator pressure can be held steady and constant.)
If the result is NG, go to “DIAGNOSTIC PROCEDURE”,
EC-297.
8) Select “SRT STATUS” in “DTC CONFIRMATION” mode
with CONSULT-II.
9) Verify that “CATALYST” is “CMPLT”.
If not “CMPLT”, repeat the test from step 3).
10) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-297.
SEF746W
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the three way
catalyst.
During this check, a DTC might not be confirmed.
1) Start engine and drive vehicle at a speed of more than
70 km/h (43 MPH) for 2 consecutive minutes.
2) Stop vehicle with engine running.
3) Set voltmeters probes between ECM terminals
q
82
(B2),
q
83
(B1) (sensor signal front) and ground.
q
89
(B2),
q
90
(B1)
(sensor signal rear) and ground.
4) Keep engine speed at 2,000 rpm constant under no
load.
5) Make sure that the voltage switching frequency (high &
low) between ECM terminals
q
89
and ground is much
less than that of ECM terminals
q
82
and ground (right
bank). Or
q
90
and ground is much less than that of the
terminals
q
83
and ground (left bank).
Switching frequency ratio =
Heated oxygen sensor 2 (rear) voltage switching
frequency
Heated oxygen sensor 1 (front) voltage switching
frequency
This ratio should be less than 0.75.
If the ratio is greater than above, it means three way
catalyst does not operate properly.
NOTE:
If the voltage at terminal
q
82
or
q
83
does not switch peri-
odically more than 5 times within 10 seconds at step 4,
perform TROUBLE DIAGNOSIS FOR DTC P0130 or
P0150 first, EC-166.
6) If NG, go to “DIAGNOSTIC PROCEDURE”, EC-297.
TROUBLE DIAGNOSIS FOR DTC P0420 (B1), P0430 (B2)
Three Way Catalyst Function (P0420: Left
bank), (P0430: Right bank) (Cont’d)
EC-296
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