Honda Element. Manual - part 86

Malfunction Threshold 

The access process to the ignition off timer fails, or a malfunction is found in the read data for at least 10 
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 
ECM/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 

DTC P2646: ROCKER ARM OIL PRESSURE SWITCH CIRCUIT LOW VOLTAGE 

Fig. 245: Rocker Arm Oil Pressure Flow Diagram 

ROCKER ARM OIL PRESSURE SWITCH CONDITIONS 

ON

(1)

(1)

Ignition switch on when a battery is disconnected and connected again is excluded.

Logic Decision

Rocker Arm Oil Pressure Switch

 

2007 Honda Element EX 

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

  

General Description 

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

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

MONITOR DESCRIPTION 

Enable Conditions 

ENABLE CONDITIONS 

Malfunction Threshold 

When the rocker arm oil control solenoid is ON, the rocker arm oil pressure switch remains ON. 

Confirmation Procedure with the HDS 

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

Driving Pattern 

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

'ON'

'OFF'

Rocker Arm Oil Control Solenoid Command 'ON'

Failure

Normal

Rocker Arm Oil Control Solenoid Command 'OFF'

Normal

Failure

Execution

Once per driving cycle

Sequence

None

Duration

10 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)

4,000 rpm

-

Vehicle speed

7 mph (10 km/h)

-

Battery voltage

10.5 V

-

Gear position

Other than P or N position

No active DTCs

P2648, P2649

 

2007 Honda Element EX 

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

  

fan comes on.  

2. Drive the vehicle in a lower gear at 4,000 rpm or more with a MAP value of 12 kPa (3.6 in.Hg, 90 

mmHg) or more for at least 10 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 
ECM/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 

DTC P2647: ROCKER ARM OIL PRESSURE SWITCH CIRCUIT HIGH VOLTAGE 

Fig. 246: Rocker Arm Oil Pressure Flow Diagram 

ROCKER ARM OIL PRESSURE SWITCH CONDITIONS 

Logic Decision

Rocker Arm Oil Pressure Switch

'ON'

'OFF'

Rocker Arm Oil Control Solenoid Command 'ON'

Failure

Normal

Rocker Arm Oil Control Solenoid Command 'OFF'

Normal

Failure

 

2007 Honda Element EX 

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

  

General Description 

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

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

MONITOR DESCRIPTION 

Enable Conditions 

ENABLE CONDITIONS 

Malfunction Threshold 

Low lift cam operation 

When the rocker arm oil control solenoid is OFF, the rocker arm 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 10 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 

Execution

Once per driving cycle

Sequence

None

Duration

10 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

P2648, P2649

Other

At idle

 

2007 Honda Element EX 

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element