DTC Troubleshooting: P2645 (21-4)
|DTC P2645 (21-4):||VTEC Solenoid Valve Circuit Malfunction|
Special Tools Required
Oil Pressure gauge attachment ( 07NAJ-P070100)
|1.||Reset the ECM/PCM.|
|2.||Check the engine oil level, and refill if necessary. Check for external damage to the oil pan.|
|3.||Start the engine. Hold the engine at 3,000 rpm (min-1) without load (in Park or neutral) unit the radiator fan comes on.|
|4.||Road test the vehicle:|
Accelerate in M/T: 2nd gear (CVT: D position) to an engine speed over 4,000 rpm (min-1). Hold that engine speed for at least 2 seconds. If DTC P2645 is not repeated during the first road test, repeat this test two more times.
Is DTC P2645 indicated?
YES - Go to 5.
NO - Intermittent failure, system is OK at this time. Check the oil consumption if oil was added in 2. Check for poor connections or loose wires at the VTEC solenoid valve and at the ECM/ PCM.n
|5.||Turn the ignition switch OFF.|
|6.||Disconnect the VTEC solenoid valve 2P connector.|
|7.||Check for resistance between VTEC solenoid valve 2P connector terminals No. 1 and No. 2.|
Is there 14-30 W?
YES - Go to 8.
|8.||Disconnect ECM/PCM connector B (24P).|
|9.||Check for continuity between ECM/PCM connector terminal B15 and body ground.|
Is there continuity?
YES - Repair short in the wire between the VTEC solenoid valve and the ECM/PCM (B15).n
NO - Go to 10.
|10.||Connect VTEC solenoid valve 2P connector terminal No. 1 to body ground with a jumper wire.|
|11.||Check for continuity between ECM/PCM connector terminal B15 and body ground.|
Is there continuity?
YES - Go to 12.
NO - Repair open in the wire between the VTEC solenoid valve and the ECM/PCM (B15).n
|12.||Remove the VTEC oil pressure switch (A) and install the special tools as shown, then reinstall the VTEC oil pressure switch.|
|13.||Reconnect ECM/PCM connector B (24P) and the VTEC solenoid valve connector.|
|14.||Start the engine. Hold the engine at 3,000 rpm (min-1) without load (in Park or neutral) unit the radiator fan comes on.|
|15.||Check oil pressure at engine speeds of 1,000 and 2,000 rpm (min-1). Keep measuring time as short as possible because the engine is running with no load (less than 1 minute).|
Is pressure below 49 kPa (0.5 kgf/cm2, 7 psi)?
YES - Go to 16.
|16.||Turn the ignition switch OFF.|
|17.||Disconnect the VTEC solenoid valve 2P connector.|
|18.||Attach the battery positive terminal to VTEC solenoid valve 2P connector terminal No. 2.|
|19.||Start the engine, then connect the battery negative to terminal No. 1 and check oil pressure at an engine speed of 3,000 rpm (min-1).|
Is pressure above 390 kPa (4.0 kgf/cm2, 57 psi)?
YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/ PCM.n