C15" (P0115-H/L) Ect Sensor Circuit Malfunction - Suzuki GSX-R750 Service Manual

"C15" (P0115-H/L) ECT SENSOR CIRCUIT MALFUNCTION

DETECTED CONDITION
C15 Output voltage is not within the following
range.
0.15 V
P0115 Sensor voltage is higher than specified
H
value.
Sensor voltage is lower than specified
L
value.
ECT sensor
INSPECTION
Step 1 (When indicating C15:)
1) Turn the ignition switch OFF.
2) Lift and support the fuel tank. (5-3)
3) Check the ECT sensor coupler for loose or poor contacts.
If OK, then measure the ECT sensor voltage at the wire side
coupler.
4) Disconnect the coupler and turn the ignition switch ON.
5) Measure the voltage between B/Bl wire terminal A and
ground.
6) If OK, then measure the voltage between B/Bl wire terminal
A and B/Br wire terminal B.
 ECT sensor voltage: 4.5 – 5.5 V
 09900-25008: Multi-circuit tester set
 Tester knob indication: Voltage ()
Is the voltage OK?
YES Go to Step 2.
• Loose or poor contacts on the ECM coupler
(terminal 0 or S).
NO
• Open or short circuit in the B/Bl wire or B/Br
wire
Sensor voltage < 4.85 V
(+ B/Bl – - Ground)
(+ B/Bl – - B/Br)
POSSIBLE CAUSE
• ECT sensor circuit open or short
• ECT sensor malfunction
• ECM malfunction
• ECT sensor circuit open or ground circuit open
• ECT sensor circuit shorted to ground
B/BI
B/Br
1
1
FI SYSTEM DIAGNOSIS 4-49
ECM
ECT
E2
V