Honda Civic Service Manual page 162

VTEC Control SYstem
The scan tool indicates Diagnostic Trouble Code {DTC) Pl259:
VTEC Solenoid Valve circuit
Refer to page 1'l-38 through 11 55 before troubleshooting
Troubleshooting Flowchart
YES
A problem in the WEC Pressure Switch circuit or
* Road Test:
Accelerate in 1st gear to an engine speed over 6,000 rp '
Hold that engine speed for at leasttwo seconos'
lf the DTC P1259 is not repeated during the first road test'
repeat this test two more times
VTEC PRESSURE SWITCH 2P
CONNECTOR
T e r m i n a l s i d e o f
m a l e t e r m t n a l s
WM
/1
IBLU/BLKI
/ 1 Y------r
t--------- l I
\1-/
|
I
I
I
1
Wire side of female
terminals
(cont'd)
6 - 5 1
The MIL has been teported on.
DTC P1259 is siored.
Check the VTEC Control SYsiem:
1. Do the engine control module
( E C M ) R e s e t P r o c e d u r e ( s e e
section 11).
2. Start the engine
3. Warm uP the engine to normal
operating temPerature (cool
ing fan comes on).
4. Do the Road Test.*
lntermittent failure, sYstem is OK
at this time.
Check for Poor connectlons or
loose wires at VTEC Pressure
swilch. VTEC aolenoid valvo and
ECM.
ls DTC P1259 indicated?
Test the VTEC Pressure 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
n e c t o r t e l m i n a l N o 1 a n d
N o . 2 .
Reolace the VTEC Pre3sure switch.
Test the VTEC Pressure Switch
Wire:
1. Turn the ignition switch ON (ll).
2. N4easure 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 . 1 a n d b o d y
g r o u n d ,
Inspect lor an open or short to
ground in the wire between the
VTEC orassure swilch and ECM
{c101.
lf the wire i3 OK, substitute a
known-good ECM and recheck.
{To page 6 52)