Honda 2004 Odyssey Service Manual page 173

Cylinder Head
DTC Troubleshooting
DTC P1259: A problem in the VTEC Oil
Pressure Switch circuit or VTEC Solenoid
Valve circuit
Special Tools Required
• Pressure gauge adapter 07NAJ-P07010A
• A/T low pressure gauge w/panel 07406-0070300
• A/T pressure hose, 2,210 mm 07MAJ-PY4011A
• A/T pressure adapter 07MAJ-PY40120
1. Do the powertrain control module (PCM) reset
procedure (see page 11-4).
2. Start the engine.
3. Warm up the engine to normal operating
temperature (cooling fan comes on).
4. Road test the vehicle:
Accelerate in 1st gear to an engine speed over
4,000 rpm. Hold that engine speed for at least
2 seconds. If DTC P1259 is not repeated during the
first road test, repeat this test two more times.
Is DT C P1259 indicated?
YES Go to step 5.
NO Intermittent failure, system is OK at this time.
Check for poor connections or loose wires at the
VTEC solenoid valve and PCM.
5. Turn the ignition switch OFF.
6. Disconnect the VTEC oil pressure switch 2P
connector.
6-6
7. Check for continuity on the VTEC oil pressure
switch between the pressure switch 2P connector
terminals No. 1 and No. 2.
VTEC OIL PRESSURE SWITCH
2P CONNECTOR
Terminal side of male
terminals
Is there continuity?
YES Go to step 8.
NO Replace the VTEC oil pressure switch.
8. Turn the ignition switch ON (II).
9. Measure the voltage between the VTEC oil
pressure switch harness 2P connector No. 1
terminal and body ground.
VTEC OIL PRESSURE SWITCH HARNESS
2P CONNECTOR
Wire side of female
terminals
Is there 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
PCM connector terminal C10 (1999-2000, 2002-2004
models) or A20 (2001 model). If the wire is OK,
substitute a known-good PCM and recheck (see
page 11-5).
VTM
(BLU/BLK)