Infiniti Q45 (FY33). Manual — part 185
SEF377U
SEF057T
SEF895VA
SEF355W
DIAGNOSTIC PROCEDURE
INSPECTION START
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground
screws.
CHECK INPUT SIGNAL CIRCUIT-1.
1. Disconnect ECM harness connector
and knock sensor sub-harness connec-
tor.
2. Check harness continuity between ter-
minal
q
4
(bank 1),
q
2
(bank 2) and
ECM terminal
105
(bank 1),
108
(bank 2).
Continuity should exist.
If OK, check harness for short to ground
and short to power.
OK
E
NG
Repair harness or connec-
tors.
CHECK INPUT SIGNAL CIRCUIT-2.
Check harness continuity between terminal
q
4
(bank 1),
q
2
(bank 2) and engine
ground.
Continuity should exist.
If OK, check harness for short to ground
and short to power.
It is necessary to use an ohmmeter
which can measure more than 10 M
Ω
.
OK
E
NG
Check the following.
I
Harness for open or short
between knock sensor
sub-harness connector-2
and knock sensor
If NG, repair open circuit or
short to ground or short to
power in harness or con-
nectors.
I
As for knock sensor
(COMPONENT
INSPECTION), refer to
below.
If NG, replace knock sen-
sor.
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.
INSPECTION END
SEF546P
COMPONENT INSPECTION
Knock sensor
1.
Disconnect knock sensor harness connector.
2.
Check resistance between terminal
q
2
and ground.
Approximately 500 - 620 k
Ω
[at 25°C (77°F)]
I
It is necessary to use an ohmmeter which can measure more
than 10 M
Ω
.
CAUTION:
Do not use any knock sensors that have been dropped or
physically damaged. Use a new one.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0325 (B1), P0330 (B2)
Knock Sensor (KS) (P0325: Left bank), (P0330:
Right bank) (Cont’d)
H
H
H
H
H
EC-269
SEF956N
Crankshaft Position Sensor (CKPS) (OBD)
SEF058T
COMPONENT DESCRIPTION
The crankshaft position sensor (OBD) is located on the transmis-
sion housing facing the gear teeth (cogs) of the drive plate. It
detects the fluctuation of the engine revolution.
The sensor consists of a permanent magnet, core and coil.
When the engine is running, the high and low parts of the teeth
cause the gap with the sensor to change.
The changing gap causes the magnetic field near the sensor to
change.
Due to the changing magnetic field, the voltage from the sensor
changes.
The ECM receives the voltage signal and detects the fluctuation of
the engine revolution.
This sensor is not used to control the engine system. It is used only
for the on board diagnosis.
ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values, and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring voltage. Doing so may result in damage to the
ECM’s transistor. Use a ground other than ECM terminals such as the body ground.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA
(AC voltage)
57
B/R
Crankshaft position sen-
sor (OBD)
Engine is running. (Warmed-up condition)
Idle speed
Approximately 1.7V
(AC voltage)
SEF391X
Engine is running. (Warmed-up condition)
Engine speed is 2,000 rpm.
Approximately 0V
SEF546T
TROUBLE DIAGNOSIS FOR DTC P0335
EC-270
ON BOARD DIAGNOSIS LOGIC
Diagnostic Trouble
Code No.
Malfunction is detected when .
Check Items
(Possible Cause)
P0335
0802
I
The proper pulse signal from the crankshaft posi-
tion sensor (OBD) is not sent to ECM while the
engine is running at the specified engine speed.
I
Harness or connectors
(The crankshaft position sensor (OBD) circuit is
open.)
I
Crankshaft position sensor (OBD)
I
Dead (Weak) battery
SEF400X
DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE
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) Turn ignition switch “ON” and select “DATA MONITOR”
mode with CONSULT-II.
2) Start engine and run it for at least 15 seconds at idle
speed.
3) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-279.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Follow the procedure “With CONSULT-II” above.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0335
Crankshaft Position Sensor (CKPS) (OBD)
(Cont’d)
EC-271
TEC056M
TROUBLE DIAGNOSIS FOR DTC P0335
Crankshaft Position Sensor (CKPS) (OBD)
(Cont’d)
EC-272
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