Honda Civic Service Manual page 399

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The scan tool indicates Diagnostic Trouble Code (DTC) P0117: A low voltage (high temperature) problem in the
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Engine Coolant Temperature (ECTI sensor circuit.
ECT SENSOR 2P CONNECTOR (C122I
Wire side of female terminals
Substitute . lnown-good ECM/
PCM .nd rocheck. It normrl ECT
is indic.ted, replaco the original
ECM/PCM,
*:'99 -Oo models except D16Y5 enginewith M/T
(cont'd)
1 1- 12 9
The MIL has been ,eported on.
DTC ml 1 7 is storod.
Problom vorification:
1. Turn the ignition switch ON (ll).
2. Check the ECT with the scan
tool.
Intermittont failulo, sy3tom it OK
at thk tim., Chock for Poor oon-
n.ctions or loo!. wiraa at C122
IECT 3en orl and ECM/FCM.
ls 302"F (150"C) or higher {or
H-Limit in Honda mode of
PGM Tester) or 0 V indicated?
Check toJ a short in the ECT s.n-
5('t:
1. Disconnect the ECT sensor 2P
connector.
2. Check the ECT with the scan
rool.
ls 302"F (150"C) or higher {or
H-Limit in Hond6 mode of
PGM Testerl or 0 V indicated?
Check for a 3hort in tho wiro
IECT linel:
1. Turn the ignition switch OFF.
2. Disconnect the ECM/PCM con-
nector D (16P) (C {31P))*.
3. Check for continuity between
the ECT sensor 2P conneclor ter-
minalNo, 1 and bodyground.
B.gair short in the wiro bltween
ECM/PCM (D2 (C261'l .nd ECT
. 1 ,