Honda Civic Service Manual page 406

PGM-FI System
Throttle Position (TP) Sensor (€6 - 98 Models, 39 - 00 D16Y5 engine with M/T)
The scan tool indicates Diagnostic Trouble Code (DTC) P0123: A high voltage problem in the Throttle Position
(TP) sensor circuit.
TP SENSOR 3P CONNECTOR IC1lOI
sG2
IGRN/BLKI
vcc2
{YEL/BLUI
Wire side of female terminals
ECM/PCM CONNECTOR D (16P)
SG2 (GRN/BLKI
Wire side of female terminals
1 1 - 1 3 6
The MIL has been reportod on.
DTC P0123 is sto.ed.
Problom veritication:
1. Turn the ignition switch ON {ll).
2 . C h e c k t h e t h r o t t l e p o s i t i o n
with the scan tool.
ls there approx. 10% when the
throttle is fully closed and
approx. 90o/o when the throttle
is lully opened?
Intermittont tailuro, system is OK
at thb timo, Check for ooor con-
nociion3 or loos6 wiros at C110
ffP s€nsor) and ECM/PCM.
Chgck to. an opan in the TP son-
sot:
1. Turn the ignition switch OFF.
2. Disconnect the TP sensor 3P
connector.
3. Turn the ignition switch ON (ll).
4. At the harness side, measure
voltage between tho TP sensor
3P connecter terminals No, 1
a n d N o . 3 .
ls there approx.5 V?
Ch.ck tor .n open in the wira
(SG2 linel:
Measure voltage between ECM/
PCM connector terminals D10 and
D 1 1 .
Repair op6n in the wire betwoen
ECM/PCM (D11) rnd TP s6nsor.
ls there approx. 5 V?
Substitute a known-good ECM/
PCM snd rech.ck. lf pra3cribed
voltago is now available, replsce
tho original ECM/PCM,