Infiniti Q45 (FY33). Manual — part 186
SEF058T
SEF377U
SEF407U
SEF799Q
DIAGNOSTIC PROCEDURE
INSPECTION START
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground
screws.
CHECK INPUT SIGNAL CIRCUIT.
1. Disconnect crankshaft position sensor
(OBD) harness connector and ECM
harness connector.
2. Check continuity between sensor termi-
nal
q
1
and ECM terminal
q
57
with CON-
SULT-II or tester.
Continuity should exist.
If OK, check harness for short to
ground and short to power.
OK
E
NG
Check the following.
I
Harness connectors
F14
,
F131
I
Harness for open or
short between crankshaft
position sensor (OBD)
and ECM
If NG, repair open circuit or
short to ground or short to
power in harness or con-
nectors.
CHECK GROUND CIRCUIT.
Check harness continuity between termi-
nal
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
F14
,
F131
I
Harness connectors
F63
,
M69
I
Harness connectors
M4
,
B3
I
Joint connector-16
I
Harness for open or
short between crankshaft
position sensor (OBD)
harness connector and
ECM
I
Harness for open or
short between crankshaft
position sensor (OBD)
and throttle actuator con-
trol module (TAC)
I
Harness for open or
short between crankshaft
position sensor and TCM
(Transmission Control
Module)
If NG, repair open circuit or
short to power in harness
or connectors.
CHECK COMPONENT
[Crankshaft position sensor (OBD)].
Refer to “COMPONENT INSPECTION” on
next page.
OK
E
NG
Replace crankshaft posi-
tion sensor (OBD).
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 P0335
Crankshaft Position Sensor (CKPS) (OBD)
(Cont’d)
H
H
H
H
H
H
EC-273
SEF960N
COMPONENT INSPECTION
Crankshaft position sensor (OBD)
1.
Disconnect crankshaft position sensor (OBD) harness connec-
tor.
2.
Loosen the fixing bolt of the sensor.
3.
Remove the sensor.
4.
Visually check the sensor for chipping.
SEF134W
5.
Check resistance as shown in the figure.
Resistance:
Approximately 166.5 - 203.5
Ω
[at 20°C (68°F)]
TROUBLE DIAGNOSIS FOR DTC P0335
Crankshaft Position Sensor (CKPS) (OBD)
(Cont’d)
EC-274
MEF328G
Camshaft Position Sensor (CMPS)
SEF503J
COMPONENT DESCRIPTION
The camshaft position sensor (CMPS) is a basic component of the
ECM. It monitors engine speed and piston position. It sends signals
to the ECM to control fuel injection, ignition timing and other func-
tions.
The camshaft position sensor has a rotor plate and a wave-form-
ing circuit. The rotor plate has 360 slits for 1° signal and 8 slits for
90° signal. Light Emitting Diodes (LED) and photo diodes are built
into the wave-forming circuit.
When the rotor plate passes between the LED and the photo diode,
the following happens:
Slits in the rotor plate continually cut the transmitted light to the
photo diode from the LED. This generates rough-shaped pulses
converted into on-off pulses by the wave forming circuit sent to the
ECM.
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
(DC voltage)
124
W/B
ECM relay (Self-shutoff)
Engine is running.
Ignition switch “OFF”
For a few seconds after turning ignition switch
“OFF”
0 - 1V
Ignition switch “OFF”
A few seconds passed after turning ignition
switch “OFF”
BATTERY VOLTAGE
(11 - 14V)
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0340
EC-275
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA
(DC voltage)
55
58
P
Crankshaft position sen-
sor (REF)
Engine is running. (Warmed-up condition)
Idle speed
Approximately 0.6 - 1.0V
SEF540T
Engine is running. (Warmed-up condition)
Engine speed is 2,000 rpm.
Approximately 0.8 - 0.9V
SEF544T
59
L
Camshaft position sensor
(POS)
Engine is running. (Warmed-up condition)
Idle speed
Approximately 2.5V
SEF547T
Engine is running. (Warmed-up condition)
Engine speed is 2,000 rpm.
Approximately 2.4V
SEF548T
130
131
R/G
Power supply for ECM
Ignition switch “ON”
BATTERY VOLTAGE
(11 - 14V)
TROUBLE DIAGNOSIS FOR DTC P0340
Camshaft Position Sensor (CMPS) (Cont’d)
EC-276
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