Yamaha TMAX 2020 Service Manual page 518

SELF-DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE
DTC Item
P0117 [P0117] Coolant
P0118 temperature sensor:
ground short circuit
detected.
[P0118] Coolant
temperature sensor:
open or power short
circuit detected.
Probable cause of
malfunction
[P0117] Low voltage
of the coolant tem-
perature sensor cir-
cuit (0.1 V or less)
[P0118] High volt-
age of the coolant
temperature sensor
circuit (4.9 V or
more)
• Defective coupler
between coolant
temperature sen-
sor and ECU.
• Open or short cir-
cuit in wire har-
ness between
coolant tempera-
ture sensor and
ECU.
• Improperly in-
stalled coolant
temperature sen-
sor.
• Defective coolant
temperature sen-
sor.
• Malfunction in
ECU.
9-44
Vehicle symptom
Engine is difficult to
start.
Increased exhaust
emissions.
Engine idling speed
is unstable.
Fail-safe system
operation
The radiator fan mo-
tor relay is on only
when the vehicle is
traveling at low
speeds.
O feedback is not
2
carried out.
ISC feedback is not
carried out.
ISC learning is not
carried out.
The coolant tem-
perature is fixed to
60 [C].
Cruise control sys-
tem cannot be oper-
ated.