## PGM-FI System

#### DTC Troubleshooting (cont'd)

11-394

DTC P1259: VTEC System Malfunction Special Tools Required

- Oil pressure gauge attachment 07NAJ-P070100
- Low pressure gauge 07406-0070001
- Hose oil pressure 07ZAJ-S5A0200

1. Reset the ECM/PCM (see page 11-312).
2. Check the engine oil level, and refill if necessary.
3. Start the engine. Hold the engine at 3.000 rpm (min-1) with no load (in Park or neutral) until the radiator fan comes on.
4. Road test the vehicle:

Accelerate in 1st gear to an engine speed over 4,000 rpm (min-1). Hold that engine speed for at least 2 seconds. If DTC P1259 is not repeated during the first road test, repeat this test 2 more times.

Is DTC 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 at the ECM/PCM.

5. Turn the ignition switch OFF.
6. Remove the resonator (see page 11-448).

7. Disconnect the VTEC oil pressure switch 2P connector.

8. Check for continuity on the VTEC oil pressure switch between the VTEC oil 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 9.
NO | - Replace the VTEC oil pressure switch.

9. Turn the ignition switch ON (II).
10. Measure voltage between the VTEC oil pressure switch 2P connector terminal No. 1 and body ground.

VTEC OIL PRESSURE SWITCH HARNESS 2P CONNECTOR

Wire side of female terminals

Is there battery voltage?

YES | - Go to step 15.
NO | - Go to step 11.