Infiniti Q45 (FY33). Manual — part 219
SEF793X
SEF894V
SEF157T
SEF069T
SEF305T
SEARCH FOR MALFUNCTIONING CIR-
CUIT.
1. Start engine and let it idle.
2. Perform “POWER BALANCE” in
“ACTIVE TEST” mode with
CONSULT-II.
3. Search for circuit which does
not produce a momentary
engine speed drop.
-------------------------------------------------------------------------------------------------------------------------------------- OR --------------------------------------------------------------------------------------------------------------------------------------
2. Check output signal voltage
between ECM terminals
q
43
,
q
44
,
q
46
,
q
47
,
q
50
,
q
51
,
q
53
,
q
54
and
ground with oscilloscope.
3. Search for circuit that signal
voltage does not match to
“DATA” in “ECM INSPECTION
TABLE”.
CHECK POWER SUPPLY-2.
1. Turn ignition switch “OFF”.
2. Disconnect ignition coil harness con-
nector(s).
3. Turn ignition switch “ON”.
4. Check voltage between each ignition
coil harness connector terminal
q
1
and
ground with CONSULT-II or tester.
Voltage: Battery voltage
OK
E
NG
Check the following.
I
Harness for open or
short between ignition
coil and ECM relay
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground
screws.
3. Check harness continuity between igni-
tion coil harness connector terminal
q
2
and engine ground.
Continuity should exist.
If OK, check harness for short to power.
OK
E
NG
Check the following.
I
Harness connectors
F61
,
F62
I
Check for open or short
between ignition coil and
engine ground
If NG, repair open circuit or
short to power in harness
or connectors.
q
A
(Go to next page.)
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P1320
Ignition Signal (Cont’d)
H
H
H
EC-405
SEF377U
SEF887Q
SEF439U
q
A
CHECK OUTPUT SIGNAL CIRCUIT-2.
1. Disconnect ECM harness connector.
2. Check harness continuity between each
ignition coil harness connector terminal
q
3
and each ECM harness connector
terminal.
Continuity should exist.
If OK, check harness for short to
ground and short to power.
OK
E
NG
Repair open circuit or short
to ground or short to power
in harness or connectors.
CHECK COMPONENT
(Ignition coil with power transistor).
Refer to “COMPONENT INSPECTION”.
OK
E
NG
Replace ignition coil
assembly.
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”.
INSPECTION END
SEF307T
COMPONENT INSPECTION
Ignition coil with power transistor
1.
Disconnect ignition coil with power transistor harness connec-
tor.
2.
Check ignition coil with power transistor for resistance between
terminals
q
3
and
q
2
.
Terminals
Resistance
Result
q
3
and
q
2
Not 0
Ω
OK
0
Ω
NG
If NG, replace ignition coil with power transistor assembly.
TROUBLE DIAGNOSIS FOR DTC P1320
Ignition Signal (Cont’d)
H
H
H
H
EC-406
SEF956N
Crankshaft Position Sensor (CKPS) (OBD)
(COG)
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 directly used to control the engine system. It is
used only for the on board diagnosis of misfire.
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
ON BOARD DIAGNOSIS LOGIC
Diagnostic Trouble
Code No.
Malfunction is detected when .
Check Items
(Possible Cause)
P1336
0905
I
Chipping of the signal plate (on drive plate) gear
teeth (cogs) is detected by the ECM.
I
Harness or connectors
I
Crankshaft position sensor (POS)
I
Signal plate (drive plate)
I
Dead (Weak) battery
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P1336
EC-407
SEF392X
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.
TESTING CONDITION:
Before performing the following procedure, confirm that bat-
tery voltage is more than 10.5V at idle.
1) Turn ignition switch “ON” and select “DATA MONITOR”
mode with CONSULT-II.
2) Start engine and run it for at least 3 minutes at idle
speed.
3) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-410.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Follow the procedure “With CONSULT-II” above.
TROUBLE DIAGNOSIS FOR DTC P1336
Crankshaft Position Sensor (CKPS) (OBD)
(COG) (Cont’d)
EC-408
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