Honda Element. Manual — part 12

Fig. 33: Secondary Heated Oxygen Sensor Output Voltage - Graph

General Description

The secondary heated oxygen sensor (HO2S) (sensor 2) detects the oxygen content in the exhaust gas
downstream of the three way catalytic converter (TWC) during stoichiometric air/fuel ratio feedback control
based on the air/fuel ratio (A/F) sensor (sensor 1) output voltage. The secondary HO2S controls the air/fuel ratio
from the A/F sensor output voltage to optimize TWC efficiency.

After current is applied to the secondary HO2S heater, if the secondary HO2S output continues high (rich)
exceeding the upper limit used during feedback control, a malfunction is detected and a DTC is stored.

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

MONITOR DESCRIPTION

Enable Conditions

ENABLE CONDITIONS

Execution

Continuous

Sequence

None

Duration

5 seconds or more

DTC Type

Two drive cycles, MIL ON

OBD Status

PASSED/FAILED/EXECUTING/OUT OF (TEST) CONDITION

Condition

Minimum

Maximum

Elapsed time that
secondary HO2S activity
is not monitored after

15 seconds

-

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

Malfunction Threshold

The secondary HO2S output voltage is 1.270 V or more for at least 5 seconds.

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. Then, drive immediately at a steady engine speed between 1,500 - 3,000 rpm for at least 1 minute.



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 during the first drive cycle, a Temporary DTC is stored in the ECM/PCM
memory. If the malfunction recurs during the next (second) drive cycle, the MIL comes on and the DTC and the
freeze frame data are stored.

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

DTC P0139 (63): ADVANCED DIAGNOSTICS

DTC P0139: SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S (SENSOR 2)) SLOW
RESPONSE

starting the engine
Engine coolant
temperature

156 °F (69 °C)

-

Intake air temperature

-13 °F (-25 °C)

-

Fuel trim

0.69

1.47

Fuel feedback

Closed loop

No active DTCs

P0010, P0011, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0133,
P0134, P0135, P0141, P0171, P0172, P0300, P0301, P0302, P0303, P0304,
P0340, P0341, P0344, P0443, P0496, P0497, P1009, P1128, P1129, P1157,
P1172, P145C, P2195, P2238, P2252, P2646, P2647, P2648, P2649, P2A00

Other

Other than at idle

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

Fig. 34: Secondary Heated Oxygen Sensor 2 Heater Circuit Diagram

Fig. 35: Secondary Heated Oxygen Sensor Output Voltage - Graph

General Description

The secondary heated oxygen sensor (HO2S) (sensor 2) detects the oxygen content in the exhaust gas
downstream of the three way catalytic converter (TWC) during stoichiometric air/fuel ratio feedback control.
The secondary HO2S controls the air/fuel ratio with the A/F sensor output voltage to optimize TWC efficiency.

If the response time of the secondary HO2S becomes longer than the specified time after current to the
secondary HO2S heater is applied, a malfunction is detected and a DTC is stored.

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

MONITOR DESCRIPTION

Execution

Once per driving cycle

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

1. When the secondary HO2S output drops to the response deterioration judgment threshold value and the

response characteristics measurement is finished.

MALFUNCTION THRESHOLD VALUE

2. The voltage does not drop to the response deterioration judgment threshold value after a predetermined

time (2.20 seconds) has elapsed.

Driving Pattern

Sequence

None

Duration

15.7 seconds or less

DTC Type

Two drive cycles, MIL ON

OBD Status

PASSED/FAILED/EXECUTING/OUT OF (TEST) CONDITION

Condition

Minimum

Maximum

Elapsed time that
secondary HO2S
activity is not
monitored after starting
the engine

15 seconds

-

Elapsed time after fuel
cut-off

-

185 seconds

Engine coolant
temperature

156 °F (69 °C)

-

Intake air temperature

-13 °F (-25 °C)

-

Engine speed

A/T

1,300 rpm

2,600 rpm

M/T

1,825 rpm

3,400 rpm

MAP value

27 kPa (7.9 in.Hg, 200 mmHg)

79 kPa (23.6 in.Hg, 600 mmHg)

Vehicle speed

30 mph (48 km/h)

-

Fuel trim

0.69

1.47

Fuel feedback

Closed loop

No active DTCs

P0010, P0011, P0101, P0102, P0103, P0107, P0108, P0111, P0112, P0113,
P0117, P0118, P0133, P0134, P0135, P0137, P0138, P0141, P0171, P0172,
P0300, P0301, P0302, P0303, P0304, P0335, P0339, P0340, P0341, P0344,
P0443, P0496, P0497, P1009, P1128, P1129, P1157, P1172, P145C, P2195,
P2238, P2252, P2270, P2271, P2646, P2647, P2648, P2649, P2A00

MIN 0.75 second
MAX 2.20 seconds

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element