Throttle Position Sensor - Honda Civic Service Manual

PGM-FI System
Throttle Position ITP) Sensor ('96 - 98 Models,'99 - 00 D16Y5 engine with M/Tl
The scan tool indicates Diagnostic Trouble Code (DTC) P0122: A low voltage problem in the Throttle Position
(TP) sensor circuit.
The TP Sensor is a potentiometer. lt is connected to the throttle valve shaft. As the throttle position changes, the throttle
position sensor varies the voltage signal to the ECM/PCM.
OUTPUT VOLTAGE IVI
1
2
1
0
s{i2
(GRN/BLKI
THROTTLE
OPENING
FULL
THROTTLE
TP SENSOR 3P CONNECTOR ICllOI
vocz
(YEL/BLUI
Wire side ot femal6 terminals
ECM/PCM CONNECTOR D IT6PI
SG2 IGRN/ALKI
{ T o p a g e l 1 - 1 3 3 )
Terminal side of male terminals
11-1 3 2
-
Tho MIL h63 boon roportod on.
-
DTC m122 i. storcd.
Probl6m voritic€tion:
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. .49 V when
the throttle is fully closed and
approx. 4.5 V when the throttle
is lully op6ned?
Int..mittent tailura, rFiem ir OK
at thit tima. Chock tor Door con-
nections or loorc wires !t C110
ITP lonrorl .nd ECM/FCM.
Ch6ck lor rn opon in the wire
(VCC2linel:
1. Turn the ignition switch OFF.
2. Disconnect ths TP sensor 3P
connector.
3. Turn the ignition switch ON lll).
4, Measure voltage between
the TP sensor 3P conn€ctor ter-
minals No. l and No.3.
ls there approx. 5 V?
Check for rn opcn in wire IVCC2
line):
Measure voltage between ECM/
PCM conneclor terminals D10 and
0 1 1 .
Chock for rn open or 3hort in TP
lon30t:
1. Turn the ignition switch OFF.
2. At the s€nsor side, measure
resistance between the TP sen-
sor terminals No. 1 and No. 2
with the throttle fully closed.
Roplir op€n in thg wiro batwcsn
ECM/PCM {DlO) rnd TP ren3or.
ls there approx.5 V?
Substitut6 r known-good ECM/
PCM and rach6ck. lf pro$ribod
vohrge i! now avrilablc, replac€
tho o.iginel €CM/FCM.
Wire side of female terminals