Honda Element. Manual - part 87

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 P2648 (21): ADVANCED DIAGNOSTICS 

DTC P2648: ROCKER ARM OIL CONTROL SOLENOID CIRCUIT LOW VOLTAGE 

Fig. 247: Rocker Arm Oil Control Solenoid Circuit Diagram 

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. If the return signal is OFF (low) when the 
ECM/PCM outputs the ON (high) signal to the rocker arm oil control solenoid, the ECM/PCM detects a 
malfunction and a DTC is stored. 

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

MONITOR DESCRIPTION 

Enable Conditions 

ENABLE CONDITIONS 

Execution

Continuous

Sequence

None

Duration

1.1 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

 

2007 Honda Element EX 

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

  

Malfunction Threshold 

The return signal is OFF (low) for at least 1.1 seconds when the ECM/PCM outputs the ON (high) signal to the 
rocker arm oil control solenoid. 

Driving Pattern 

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 4,000 rpm or more with a manifold absolute pressure (MAP) value of 

12 kPa (3.5 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 P2649 (21): ADVANCED DIAGNOSTICS 

DTC P2649: ROCKER ARM OIL CONTROL SOLENOID CIRCUIT HIGH VOLTAGE 

Condition

Minimum

Maximum

Battery voltage

10.0 V

-

No active DTCs

P2649

 

2007 Honda Element EX 

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

  

Fig. 248: Rocker Arm Oil Control Solenoid Circuit Diagram

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. If the return signal is ON (high) when the 
ECM/PCM outputs the OFF (low) signal to the rocker arm oil control solenoid, the ECM/PCM detects a 
malfunction and a DTC is stored. 

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

MONITOR DESCRIPTION 

Enable Conditions 

ENABLE CONDITIONS 

Malfunction Threshold 

The return signal is ON (high) for at least 1.1 seconds when the ECM/PCM outputs the OFF (low) signal to the 
rocker arm oil control solenoid. 

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 
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 

Execution

Continuous

Sequence

None

Duration

1.1 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

Battery voltage

10.0 V

-

State of the engine

Running

No active DTCs

P2648

 

2007 Honda Element EX 

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

  

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 P2A00 (61): ADVANCED DIAGNOSTICS 

DTC P2A00: AIR/FUEL RATIO (A/F) SENSOR (SENSOR 1) CIRCUIT RANGE/PERFORMANCE 
PROBLEM 

Fig. 249: Relationship Between A/F Sensor Output And Oxygen Concentration 

General Description 

The air/fuel ratio (A/F) sensor has a linear signal output in relation to the oxygen concentration. The engine 
control module (ECM)/powertrain control module (PCM) computes the air/fuel ratio from A/F sensor output 
voltage and uses the fuel feedback control to improve exhaust emissions. The ECM/PCM monitors A/F sensor 
output voltage during deceleration with the throttle fully closed, and if the output voltage deviates greatly from 
normal oxygen concentration levels, it detects a malfunction and stores a DTC. 

* Output to the scan tool exhibits a relationship between the A/F sensor output and oxygen concentration, which 
is opposite to the characteristic shown in the graph. That is, a deviation toward the rich side increases the output 
voltage and one toward the lean side decreases the output voltage as the stoichiometric ratio is 0. 

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

MONITOR DESCRIPTION 

Execution

Once per driving cycle

Sequence

None

Duration

3.5 seconds or more

DTC Type

Two drive cycles, MIL ON

 

2007 Honda Element EX 

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element