Honda Civic Service Manual page 115

VTEC Control System
Troubleshooting Flowchart
tFtrsrl #ilH:::lj1t:"J:T,?ffnostic
rrouble code (Drc) Pr25e: A probrem in the vrEc Pressure
switch circuit or
Reter to page 1 l-38 th roug h 1 1-55 before trou bleshooting.
* Road Test:
A c c e l e r a t e i n 1 s t g e a r t o a n e n g i n e s p e e d o v e r 3 , 0 0 0 r p m
(D16Y5 engine) or 6,000 rpm (D'16Y8 engine).
Hold that engine speed for at least two seconds.
It DTC P1259 is not repeated during the first road test, repeat
this test two more tames.
VTEC PRESSURE SWITCH 2P
CONNECTOR
Terminal side of
male terminals
W i r e s i d 6 o l f e m a l e
r e r m t n a t s
VTM
l1
(BLu/BLK)
f;-) |
I
I
Y
I
The MIL has been reoorted on.
DTC P1259 is sto.ed.
Check the VTEC Cont.ol Syst6m:
1. Do the engine control module
(ECM)/powertrain control mod
ule lPCM) Reset Procedure (see
section 11).
2. Stan the engine.
3. Warm up the engine to normal
operating temperature (cool-
ing fan comes on).
4. Do the Boad Test.*
Intermittont tailura, 3y3t.m is OK
at thia time.
Check for ooor connoctionr o.
loose wirea at VTEC oiassurc
lwitch, VTEC solonoid valvo .nd
ECM/PCM,
ls OTC P1259 indicated?
Test rhe VTEC Prensure Switch:
1. Turn the ignition switch OFF.
2. Disconnect the VTEC Pressure
switch 2P connector.
3. Check for continuity between
VTEC pressure switch 2P con-
nector terminal No. 1 and No.
2 .
Replace the VTEC preasure 3witch.
l s t h e r e c o n t i n u i t y ?
Te3t the VTEC Pressure Switch
Wire:
1. Turn the ignition switch ON lll).
2. Measure the voltage between
V T E C p r e s s u r e s w i t c h 2 P
c o n n e c t o r N o . l a n d b o d y
ground.
In3poct for en opon or shod to
ground in thG wi.. bctwoon tho
VTEC pro$ur6 switch rnd ECM/
PCM l'96 - 9a: C15,'99 - 00: C101.
lf tha wiro i3 OK,3ubrtitute a
k n o w n - g o o d E C M / P C M a n d
recheck.
l s t h e r e b a t t e r y v o l t a g e ?
{To page 6'4i