Honda Element. Manual — part 14

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 P0172 (45): ADVANCED DIAGNOSTICS

DTC P0172: FUEL SYSTEM TOO RICH

Fig. 38: Air/Fuel Ratio - Graph

General Description

The engine control module (ECM)/powertrain control module (PCM) detects the oxygen content in the exhaust
gas from the air/fuel ratio (A/F) sensor (sensor 1) signal voltage, and it uses fuel feedback control to maintain
the optimal air/fuel ratio. The air/fuel ratio coefficient for correcting the amount of injected fuel is the short term
fuel trim. The ECM/PCM varies short term fuel trim continuously to keep the air/fuel ratio close to the
stoichiometric ratio for all driving conditions. Long term fuel trim is computed from short term fuel trim and is
used to regulate long term deviation from the stoichiometric air/fuel ratio, which occurs when fuel metering
components deteriorate with age or system failures occur. In addition, long term fuel trim is stored in the
ECM/PCM memory and is used to determine when fuel metering components malfunction. When long term
fuel trim is higher than normal, which is about 1.0 (0 %), the amount of injected fuel must be increased, and
when lower than normal, it must be decreased. If long term fuel trim is lower than normal (too rich), a
malfunction in the fuel metering components is detected and a DTC is stored.

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

MONITOR DESCRIPTION

Enable Conditions

Execution

Once per driving cycle

(1)

Sequence

None

Duration

11.2 seconds

DTC Type

Two drive cycles, MIL ON

OBD Status

N/A

(1)

The malfunction judgment is cleared when it is judged as normal under the same driving conditions
in which the malfunction is detected.

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

ENABLE CONDITIONS

Malfunction Threshold

Long term fuel trim is lower than 0.81 (-19 %).

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 at a steady speed between 15 - 75 mph (24 - 120 km/h) for at least 15 minutes, and watch the

long term fuel trim. If the long term fuel trim stays at about 1.0, the vehicle is OK or it is a very minor
problem. If a significant fault is still present, the long term fuel trim will move up or down while driving.



When freeze frame data is stored, drive the vehicle under those conditions instead of Driving
Pattern 2.



If the EVAP monitor runs instead of the HO2S monitor, turn the engine off, then restart it, and the
HO2S monitor will restart.



After clearing the DTC by disconnecting the battery or using the scan tool, extend Driving Pattern
2 to 40 minutes or longer to allow time for long term fuel trim to recover.



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

Condition

Minimum

Maximum

Engine coolant
temperature

156 °F (69 °C)

-

Intake air
temperature

19 °F (-7 °C)

-

Engine
speed

A/T

550 rpm

4,000 rpm

M/T

4,100 rpm

MAP value

20 kPa (6.0 in.Hg, 150 mmHg)

-

Fuel feedback Closed loop
Monitoring
priority

P0420, P0456, P0457, P0497

No active
DTCs

P0107, P0108, P0112, P0113, P0117, P0118, P0134, P0135, P0137, P0138, P0300,
P0301, P0302, P0303, P0304, P0335, P0339, P0341, P0443, P0496, P0497, P1009,
P1128, P1129, P1157, P1172, P145C, P2195, P2227, P2228, P2229, P2238, P2252,
P2270, P2271, P2646, P2646, P2647, P2647, P2648, P2649

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

The MIL will be cleared if the malfunction does not recur during three consecutive drive cycles in which the
engine conditions are similar to the first time the malfunction was detected.

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 P0222 (7): ADVANCED DIAGNOSTICS

DTC P0222: THROTTLE POSITION (TP) SENSOR B CIRCUIT LOW VOLTAGE

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

Fig. 39: Throttle Position (TP) Sensor Circuit Diagram

General Description

Throttle position (TP) sensor B is a semiconductor type, and it is attached to the throttle body and shaft to
determine throttle valve position.

The throttle valve position signal from TP sensor B is transmitted to the throttle actuator control module for
target position feedback control, then to the engine control module (ECM)/powertrain control module (PCM) as

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element