Acura RL. Instruction — page 99

ENABLE CONDITIONS

Malfunction Threshold

The VLBLB 2 voltage is 4.7 V or more for at least 5 seconds.

Diagnosis Details

Conditions for illuminating the MIL

When a malfunction is detected, the MIL comes on and the DTC and the freeze frame data are stored in the
PCM memory.

Conditions for clearing the MIL

The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the
diagnostic runs.

The MIL, the DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by
disconnecting the battery.

DTC P2646 (22): ADVANCED DIAGNOSTICS (L4 ENGINE A/T)

DTC P2646: ROCKER ARM OIL PRESSURE SWITCH (VTEC OIL PRESSURE SWITCH)
CIRCUIT LOW VOLTAGE

Fig. 309: Rocker Arm Oil Pressure Switch (VTEC Oil Pressure Switch) Circuit Diagram (Low
Voltage)

ROCKER ARM OIL PRESSURE SWITCH OPERATION CHART

Condition

Ignition switch

ON

No active DTCs

P0155, P2197, P2240, P2241, P2247, P2249, P2254, P2255, P2630

Logic Decision

Rocker Arm Oil Pressure Switch (VTEC Oil

Pressure Switch)

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:08 PM

Page 393 © 2005 Mitchell Repair Information Company, LLC.

General Description

The VTEC system activates the rocker arm oil control solenoid (VTEC solenoid valve) by command from
the powertrain control module (PCM), and it charges/discharges the hydraulic circuit of the VTEC
mechanism that switches valve timing between Low and High. The PCM monitors oil pressure in the
hydraulic circuit of the VTEC mechanism using the rocker arm oil pressure switch (VTEC oil pressure
switch) downstream of the rocker arm oil control solenoid (VTEC solenoid valve). If there is a difference
between the oil pressure condition in the hydraulic circuit that is determined by the PCM command and the
oil pressure condition that is determined by the status of the rocker arm oil pressure switch (VTEC oil
pressure switch), the system is considered faulty, and a DTC is stored.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

When the rocker arm oil control solenoid (VTEC solenoid valve) is ON, the rocker arm oil pressure switch
(VTEC oil pressure switch) remains ON.

Confirmation Procedure with the HDS

Do the VTEC TEST in the INSPECTION MENU with the HDS.

Driving Pattern

‘ON’

‘OFF’

Rocker Arm Oil Control Solenoid (VTEC Solenoid
Valve) Command ‘ON’

Failure

Normal

Rocker Arm Oil Control Solenoid (VTEC Solenoid
Valve) Command ‘OFF’

Normal

Failure

Execution

Once per driving cycle

Sequence

None

Duration

7 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

Engine coolant temperature

50°F (10°C)

Engine speed (High lift cam
operation

4,750 rpm

Vehicle speed

7 mph (10 km/h)

Battery voltage

10.5 V

Gear position

Other than P or N position

No active DTCs

P1109, P2227, P2228, P2229, P2648, P2649

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:08 PM

Page 394 © 2005 Mitchell Repair Information Company, LLC.

1. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the

radiator fan comes on.

2. Drive the vehicle in a lower gear at 4,750 rpm or more for at least 7 seconds.

Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

Diagnosis Details

Conditions for illuminating the MIL

When a malfunction is detected, the MIL comes on and the DTC and the freeze frame data are stored in the
PCM memory.

Conditions for clearing the MIL

The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the
diagnostic runs.

The MIL, the DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by
disconnecting the battery.

DTC P2647 (22): ADVANCED DIAGNOSTICS (L4 ENGINE A/T)

DTC P2647: ROCKER ARM OIL PRESSURE SWITCH (VTEC OIL PRESSURE SWITCH)
CIRCUIT HIGH VOLTAGE

Fig. 310: Rocker Arm Oil Pressure Switch (VTEC Oil Pressure Switch) Circuit Diagram (High
Voltage)

ROCKER ARM OIL PRESSURE SWITCH OPERATION CHART

Logic Decision

Rocker Arm Oil Pressure Switch (VTEC Oil

Pressure Switch)

‘ON’

‘OFF’

Rocker Arm Oil Control Solenoid (VTEC Solenoid
Valve) Command ‘ON’

Failure

Normal

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:08 PM

Page 395 © 2005 Mitchell Repair Information Company, LLC.

General Description

The VTEC system activates the rocker arm oil control solenoid (VTEC solenoid valve) by command from
the powertrain control module (PCM), and it charges/discharges the hydraulic circuit of the VTEC
mechanism that switches valve timing between Low and High. The PCM monitors oil pressure in the
hydraulic circuit of the VTEC mechanism using the rocker arm oil pressure switch (VTEC oil pressure
switch) downstream of the rocker arm oil control solenoid (VTEC solenoid valve). If there is a difference
between the oil pressure condition in the hydraulic circuit that is determined by the PCM command and the
oil pressure condition that is determined by the status of the rocker arm oil pressure switch (VTEC oil
pressure switch), the system is considered faulty, and a DTC is stored.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

When the rocker arm oil control solenoid (VTEC solenoid valve) is OFF, the rocker arm oil pressure switch
(VTEC oil pressure switch) remains OFF.

Confirmation Procedure with the HDS

Do the VTEC TEST in the INSPECTION MENU with the HDS.

Driving Pattern

Start the engine, and let it idle for at least 7 seconds.

Diagnosis Details

Conditions for illuminating the MIL

When a malfunction is detected, the MIL comes on and the DTC and the freeze frame data are stored in the

Rocker Arm Oil Control Solenoid (VTEC Solenoid
Valve) Command ‘OFF’

Normal

Failure

Execution

One per driving cycle

Sequence

None

Duration

7 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

Battery voltage

10.5 V

No active DTCs

P1109, P2227, P2228, P2229, P2648, P2649

Other

At idle

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:08 PM

Page 396 © 2005 Mitchell Repair Information Company, LLC.

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