Honda Civic Service Manual page 401

PGM-FI System
t
I
Engine Coolant Temperature (ECT) Sensor
('99 - 00 Models except Dl6Y5 engine with M/Tl
The scan tool indicates Diagnostic Trouble Code (DTC) P0118: A high voltage (low temperature) problem in the
Engine Coolant Temperature (ECT) sensor circuit.
ECT SENSOR 2P CONNECTOR {C122)
ECT
(RED/Wr{T)
JUMPER IVIRE
sG2
{GRN/BLK)
wire side of female terminals
ECM/PCM CONNECTOB C 131PI
The MIL has been reported on,
oTC P0118 is stored.
Problem verilication:
1. Turn the ignition switch ON (ll).
2. Check the ECT with the scan
tool.
lntormittent failuro, systom is OK
at thb timo. Check lor poor con'
nections or 10036 wiraa at C122
{ECT ssnsorl and ECM/rcM.
ls -4'F (-20"C) or less lor L-Limit
in Honda mode o{ PGM Tester) or
5 V indicated?
Check for an open in the Efi sen'
sori
1. Disconnect the ECT sensor 2P
connector,
2 . C o n n e c t t h e E C T s e n s o r 2 P
connector terminals No, 1 and
No. 2 with a jumper wire.
3. Check the ECT with the scan
tool.
ls -4"F 1-20"C) or less (or L-Limit
in Honda mode of PGM Tester) or
5 V indicated?
Check for sn open in the wires
IECT. SG2 linesl:
1. Turn the ignition switch OFF.
2. Connect ECM/PCM connector
terminals C18 and C26 with a
jumper wire.
3. Turn the ignition switch ON (ll).
4. Check the ECT with lhe scan
tooi.
Rspair opon in th6 wiros bstwoon
ECM/PCM (Cl8, C26l and ECT
3ensot.
ls -4'F {-20"C) or less (or L-Limit
in Honda mode of PGN4 Tester) or
5 V indicated?
Substitute 6 known-good ECM/
PCM and recheck. l{ no.mal EcT
is indicatod, .eplace the original
ECM/PCM.
JUMPER WIRE
Wire side of female terminals
1 1 - 1 3 1