Honda Civic Service Manual page 266

DTC P0118: ECT Sensor Circuit High Voltage
1 . T u r n t h e i g n i t i o n s w i t c h O N ( l l ) .
2. Check the ECT with the scan tool.
ls
20'C ( 4'F)or less (or L-Limit in Honda
mode of PGM Tester) or 5 V indicated?
?
5 .
YES Go to step 3.
NO lntermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the ECT sensor and at the ECM. I
Turn the ignition switch OFF.
Disconnect the ECT sensor 2P connector.
Connect the ECT sensor 2P connector terminals
N o . 1 a n d N o . 2 w i t h a j u m p e r w i r e .
ECT SENSOR 2P CONNECTOR
\
l t l t l
t t . l
Ecr
-I-l*,
(RED/WHT)
{GRN/YEL)
t l
JUMPER WIRE
wire side oI Iemale terminals
6 . T u r n t h e l g n i t i o n s w i t c h O N ( l l ) .
1 .
8 .
9 .
1 0 .
Check the ECT with the scan tool.
ls
20"C ( 4"F)or less (or L-Limit in Honda
mode ot PGM Tester) or 5 V indicated?
YES-Go to step 8.
N O R e p l a c e t h e E C T s e n s o r . I
Turn the ignition switch OFF.
R e m o v e t h e j u m p e r w i r e .
Connect ECM connector terminals A10 and Bg with
a j u m p e r w i r e .
ECM CONNECTORS
a {31 P} B {24 P)
Wire side of female terminals
T u r n t h e i g n i t i o n s w i t c h O N ( l l ) .
Check the ECT with the scan tool.
ls
20"C ( 4"F) or less (or L-Limit in Honda
mode of PGM Tester) ot 5 V indicated?
YES - Update the ECM if it does not have the latest
software, or substitute a known-good ECI\4, then
recheck (see page 1 1-6). If the symptom/indication
goes away with a known-good ECM, replace the
o r i g i n a l E C M . I
NO Repair open in the wire between the ECM
( A 1 0 , 8 8 ) a n d t h e E C T s e n s o r . l
1 1 .
1 2 .
JUMPER WIRE
1 1 - 5 9