Engine Coolant Temperature (Ect) Sensor - Honda CR-V 1997 Service Manual

Engine Coolant Temperature (ECT) Sensor
I
P0116
I
The scan tool indicates Diagnostic Trouble Code (DTC) POllS: A range/performance problem in the Engine
Coolant Temperature IECT) Sen sor circuit.
Th e ECT Sensor is a temperature dependant resistor (thermistor). The resistance of the thermistor decreases as the engine
coolant temperature increases as shown below.
RESISTANCE
IkOJ
,.
10
S
D.
D. '
I\,
,
"
~
"'I
"
-.4 3268104'40176212248(",
-20 0 20
to
10 . , 100 120 I 'C)
ENGINE COOLANT TEMP£RATURE
NOTE: If DTC pal 17 and/or POllS are stored at the same time as DTC P011S, troubleshoot those DTCs first, then trou-
bleshoot DTC P0116.
Possible Cause
• Eel
sensor deterioration
• Malfunction in the thermostat and cooling system
Troubleshooting Flowchart
- The MIL has been reported on.
-
OTe P0116 is stored.
I
Problem vermcation:
1. Start the engine . Hold the
engine at
3,000
rpm
with
no
loa d (in Park or neutral) until
the radiator fan comes on,
then let
it
id le.
2.
With the scan tool. check the
ECT.
I
Is 176 ~ 200°F (SO - 93°C) or
YES
Intermittent failure, system is OK
0. 4 - 0.7 V ind icated?
at this time. Check the thermo-
stat and the cooling system.
I
NO
Check the thermostat and the
cooling system . If they are OK,
repllce the Eel sensor.
(cont'd)
11-99