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Cylinder Head
DTC Troubleshooting
DTC P1259: A problem in the WEC Oil
Pressure Switch circuit or VTEC Solenoid
Valve circuit.
SpecialTools Bequired
. Pressure gauge adaptor 07NAJ-P07010A
. A,/T low pressure gauge W/panel 07406-0070300
. A'/T pressure hose 07406-0020201
. A,/T pressure hose,2,21Q mm 0T|VIAJ-PY4o11A
. A,/T pressure adaptor 07MAJ-PY40120
1 . R e s e t t h e e n g i n e c o n t r o l m o d u l e ( E C M ) ( s e e p a g e
1 1 - 4 ) .
Check the engine oil level, and refill if necessary.
Start the engine.
3. Warm up the engine to normal operating
t e m p e r a t u r e ( c o o l i n g f a n c o m e s o n ) .
4. Road test the vehicle:
Accelerate in 1st gear to an engine speed over
6,000 rpm. Hold that engine speed for at Ieast 2
seconds. lf DTC P1259 is not repeated during the
first road lest, repeat this test two more times,
ls DTC P 1259 indicated?
YES Go to step 5.
NO lntermittent failure, system is OK at this time.
Check for poor connections or loose wires at VTEC
s o l e n o i d v a l v e a n d E C M . I
5. Turn the ignition switch OFF.
6-6
6. Disconnecl the VTEC oil pressure switch 2P
connector.
7. Check for continuity on the VTEC oil pressure
switch between the pressure switch 2P connector
t e r m i n a l s N o . I a n d N o . 2 .
VTEC OIL PRESSURE SWITCH
2P CONNECTOR
Terminal side oJ m4e
I e r m t n a t s
Is therc continuity?
YES - Go to step 8.
NO Replace the VTEC oil pressure switch.l
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 ) .
Measure the voltage between the VTEC oil
pressure switch harness 2P connector terminal No.
1 and body ground.
/ r \----r
r_-_---------t
I
\
2
, /
t w M
\---'l
| {BLU/BLK)
l
A
(v)
I
I
_l_
Wire side of female
I e r m t n a t s
ls thete battery voltage?
YES- Go to step '10.
NO- Inspect for an open or short to ground in the
wire between the VTEC oil pressure switch and the
ECM (C10). lf the wire is OK, substitute a known-
good ECM and recheck.I
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Table of Contents
Troubleshooting
