Dtc P0123: Tp Sensor Circuit High Voltage - Honda S2000 Service Manual

DTC P0123: TP 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 throttle position with the scan tool.
ls there approx. 6o/" when the throttle is fully
closed and approx. 90o/" when the throttle is f ully
opened?
YES Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the TP serisor and at the ECM.I
NO Go to step 3.
3. Turn the ignition switch OFF.
4. Disconnect the TP sensor 3P connector.
5 . 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 l .
6. At the wire harness side, measure voltage between
T P s e n s o r 3 P c o n n e c t o r t e r m i n a l s N o . 1 a n d N o . 3 .
TP SENSOR 3P CONNECTOR
SG2IGRN/YEL)
VCC2 (YEL/BLU)
Wire side oJ female terminals
ls there about 5 V?
YES Replace the throttle body.l
NO Go to step 7.
7. Measure voltage between ECM connector
t e r m i n a l s C ' 1 8 a n d C 2 8 ,
ECM CONNECTOR C {31P)
SG2 (GRN/YEL)
8 | I l t 0
2 5
l l
12
l 4
1 1 8 1 1 9 1 2 A 1 2 1 1 2 2
25 26 21 8 t
t 2 9 1 3 0
VCC2 {YEL/BLU)
Wire side of female terminals
lstherc about 5 V?
YES Repair open in the wire between the ECM
{ C l 8 ) a n d t h e T P s e n s o r . l
NO-Substitute a known-good ECM and recheck
(see page 11-5). lf prescribed voltage is now
a v a i l a b l e r e p l a c e t h e o r i g i n a l E C M . I
1 1 - 5 3