Infiniti Q45 (FY33). Manual — part 290
SEL368VA
Ground circuit check
Terminals
Continuity
q
39
- Ground
Yes
SEL369VA
CEL914
INSPECTION/VEHICLE SPEED SENSOR
CHECK VEHICLE SPEED SENSOR
OUTPUT.
1. Remove vehicle speed sensor from
transmission.
2. Check voltage between combination
meter terminals
q
12
and
q
14
while quickly
turning speed sensor pinion.
Voltage: Approx. 0.5V
NG
E
OK
Vehicle speed sensor is
OK.
CHECK VEHICLE SPEED SENSOR.
Check resistance between vehicle speed
sensor terminals
q
1
and
q
2
.
Resistance: Approx. 250
Ω
OK
E
NG
Replace vehicle speed
sensor.
Check harness for open or short between
speedometer and vehicle speed sensor.
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
IDX
METER AND GAUGES
Trouble Diagnoses (Cont’d)
H
H
EL-151
SEL370VA
INSPECTION/ENGINE REVOLUTION SIGNAL
CHECK ECM OUTPUT.
1. Start engine.
2. Check voltage between combination
meter terminal
q
13
and ground at idle
and 2,000 rpm.
Higher rpm = Higher voltage
Lower rpm = Lower voltage
Voltage should change with rpm.
NG
E
OK
Engine revolution signal is
OK.
Check the following.
I
Harness for open or short between ECM
and combination meter
SEL632VB
SEL372VD
INSPECTION/FUEL LEVEL SENSOR UNIT
CHECK GROUND CIRCUIT FOR FUEL
LEVEL SENSOR UNIT.
Check harness continuity between fuel
level sensor unit terminal
q
4
and ground.
Continuity should exist.
OK
E
NG
Check harness for open or
short between ECM and
fuel level sensor unit.
CHECK FUEL LEVEL SENSOR UNIT.
Refer to “FUEL LEVEL SENSOR UNIT
CHECK” (EL-154).
OK
E
NG
Repair or replace.
Refer to FE section.
(“FUEL SYSTEM”)
CHECK HARNESS FOR OPEN OR
SHORT.
1. Disconnect combination meter connec-
tor and fuel level sensor unit connector.
2. Check continuity between combination
meter terminal
q
8
and fuel level sensor
unit terminal
q
5
.
Continuity should exist.
3. Check continuity between combination
meter terminal
q
8
and ground.
Continuity should not exist.
OK
E
NG
Repair harness or connec-
tor.
Fuel level sensor unit is OK.
METER AND GAUGES
Trouble Diagnoses (Cont’d)
H
H
H
H
EL-152
SEL373VA
INSPECTION/THERMAL TRANSMITTER
CHECK THERMAL TRANSMITTER.
Refer to “THERMAL TRANSMITTER
CHECK” (EL-154).
OK
E
NG
Repair or replace.
CHECK HARNESS FOR OPEN OR
SHORT.
1. Disconnect combination meter connec-
tor and thermal transmitter connector.
2. Check continuity between combination
meter terminal
q
7
and thermal transmit-
ter terminal
q
1
.
Continuity should exist.
3. Check continuity between combination
meter terminal
q
7
and ground.
Continuity should not exist.
OK
E
NG
Repair harness or connec-
tor.
Thermal transmitter is OK.
Electrical Components Inspection
METER/GAUGE RESISTANCE CHECK
1.
Disconnect FPC connector. Refer to “Flexible Print Circuit
(FPC)” (EL-148).
2.
Check resistance between installation screws of meter/gauge
after removing meter/gauge.
Screws
Resistance
Ω
Tachometer
Fuel/Temp. gauge
A - C
A - C
Approx. 70 - Approx. 140
B - D
B - C
Approx. 90 - Approx. 170
CEL915
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
IDX
METER AND GAUGES
Trouble Diagnoses (Cont’d)
H
H
EL-153
SEL064X
FUEL LEVEL SENSOR UNIT CHECK
I
For removal, refer to FE section “FUEL SYSTEM”.
Check the resistance between terminals
q
5
and
q
4
.
Ohmmeter
Float position
mm (in)
Resistance value
Ω
(+)
(−)
q
5
q
4
*3
Full
70 (2.76)
Approx. 4 - 6
*2
1/2
189 (7.44)
31 - 34
*1
Empty
308 (12.13)
80 - 83
*1 and *3: When float rod is in contact with stopper.
MEL424F
THERMAL TRANSMITTER CHECK
Check the resistance between the terminals of thermal transmitter
and body ground.
Water temperature
Resistance
60°C (140°F)
Approx. 170 - 210
Ω
100°C (212°F)
Approx. 47 - 53
Ω
MEL425F
OIL PRESSURE SWITCH CHECK
Oil pressure
kPa (kg/cm
2
, psi)
Continuity
Engine start
More than 20 - 29
(0.2 - 0.3, 3 - 4)
NO
Engine stop
Less than 20 - 29
(0.2 - 0.3, 3 - 4)
YES
Check the continuity between the terminals of oil pressure switch
and body ground.
CEL219
VEHICLE SPEED SENSOR SIGNAL CHECK
1.
Remove vehicle speed sensor from transmission.
2.
Turn vehicle speed sensor pinion quickly with fingers and mea-
sure voltage across
q
2
and
q
1
.
CEL520
DIODE CHECK
I
Check continuity using an ohmmeter.
I
Diode is functioning properly if test results are as shown in the
figure at left.
NOTE: Specification may vary depending on the type of tester.
Before performing this inspection, be sure to refer to
the instruction manual for the tester to be used.
METER AND GAUGES
Electrical Components Inspection (Cont’d)
EL-154
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