C15" Ect Sensor Circuit Malfunction - Suzuki AN650 2002 Service Manual

"C15" ECT SENSOR CIRCUIT MALFUNCTION

DETECTED CONDITION
Output voltage low or high.
0.15 V Sensor voltage
(
without the above range.
INSPECTION
• Remove the maintenance lid. (
1 Turn the ignition switch OFF.
Check the ECT sensor coupler for loose or poor contacts.
If OK, then measure the ECT sensor voltage at the wire
side coupler.
Disconnect the coupler and turn the ignition switch ON.
Measure the voltage between B/Bl wire terminal and
ground.
If OK, then measure the voltage between B/Bl wire termi-
nal and B/Br wire terminal.
;
ECT sensor voltage: 4.5 – 5.5 V
z
09900-25008: Multi circuit tester
u
Tester knob indication: Voltage (
Yes
2
Turn the ignition switch OFF.
Measure the ECT sensor resistance.
;
ECT sensor resistance:
z
Approx. 2.45 kΩ at 20 ˚C (68 ˚F) (Terminal – Terminal)
09900-25008: Multi circuit tester
t
Tester knob indication: Resistance (Ω)
Refer to page 8-13 for details.
Yes
B/Bl or B/Br wire open or shorted to ground, or poor n
connection.
If wire and connection are OK, intermittent trouble or faulty
ECM.
Recheck each terminal and wire harness for open circuit
and poor connection.
<
4.85 V
)
:
9-13)
+ -
( + B/Bl – - Ground )
B/Bl – B/Br
-
)
No
Loose or poor contacts on
the ECM coupler.
Open or short circuit in the
B/Bl wire or B/Br wire.
No
Replace the ECT sensor
with a new one.
Replace the ECM with a new
one, and inspect it again.
n
ECM coupler
POSSIBLE CAUSE
• ECT sensor circuit open or short.
• ECT sensor malfunction.
• ECM malfunction.
1
1
B/Bl
2
k
or
Engine Coolant
Temp.
20 ˚C ( 68 ˚F)
50 ˚C (112 ˚F)
80 ˚C (176 ˚F)
110 ˚C (230 ˚F)
k k
FI SYSTEM/ CVT SYSTEM 6-33
B/Br
Ω
Resistance
Approx. 2.45 kΩ
Approx. 0.811 kΩ
Approx. 0.318 kΩ
Approx. 0.142 kΩ
V