P2647
DTC P2647: VTEC Oil Pressure Switch CircuitHigh Voltage - 2005 model
Special Tools Required
^ Pressure gauge adapter 07NAJ-PO7010A
^ A/T low pressure gauge w/panel 07406-0070300
^ A/T pressure hose, 2,210 mm 07MAJ-PY4011A
^ A/T pressure hose adapter 07MAJ-PY40120
1. Do the engine control module (ECM) reset procedure.
2. Start the engine.
3. Warm up the engine to normal operating temperature (cooling fan comes on).
Is DTC P2647 indicated?
YES-Go to step 4.
NO-intermittent failure, system is OK at this time. Check for poor connections or loose wires at the VTEC solenoid valve and the ECM.
4. Turn the ignition switch OFF.
5. Remove the VTEC oil pressure switch (A) and install the special tools as shown, then install the VTEC oil pressure switch (A) to the oil pressure gauge adapter (B).
NOTE: Install the part in the reverse order of removal with a new O-ring.
6. Warm up the engine to normal operating temperature (cooling fan comes on).
7. Check oil pressure at engine speeds of 1,000, 2,000, and 4,000 rpm. Keep measuring time as short as possible because the engine is running with no load (less than one minute).
Is pressure below 49 kPa (0.5 kgf/cm2, 7 psi)?
YES-Go to step 8.
NO-inspect the VTEC solenoid valve.
8. Disconnect the VTEC oil pressure switch 2P connector.
9. At the VTEC oil pressure switch side, check for continuity between the VTEC oil pressure switch 2P connector terminals No. 1 and No. 2.
Is there continuity?
YES-Go to step 10.
NO-Replace the VTEC oil pressure switch.
10. Measure voltage between VTEC oil pressure switch 2P connector terminal No. 1 and body ground.
Is there battery voltage?
YES-Repair an open in the wire between the VTEC oil pressure switch and G101.
NO-Go to step 11.
11. Measure voltage between ECM connector terminal C10 and body ground.
Is there battery voltage?
YES-Repair an open in the wire between the ECM (C10) and the VTEC oil pressure switch.
NO-Substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.