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
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