Acura RL. Instruction — page 12

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

One of these conditions must be met for at least 2 seconds.

No return signal «HIGH» is detected when the PCM output duty is less than 20%.

Return signal does not change when the PCM output duty is more than 20% and less than 80%.

No return signal «LOW» is detected when the PCM output duty is more than 80%.

Driving Pattern

Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan
comes on, then let it idle.

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
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 P0157 (162): ADVANCED DIAGNOSTICS

DTC P0157: FRONT SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S (BANK 2,
SENSOR 2)) CIRCUIT LOW VOLTAGE

Condition

State of the engine

Running

Other

During front A/F sensor heater operation

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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© 2005 Mitchell Repair Information Company, LLC.

Fig. 34: Front Secondary Heated Oxygen Sensor (Secondary HO2S (Bank 2, Sensor 2)) Low Voltage —
Circuit Diagram

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

General Description

The front secondary heated oxygen sensor (HO2S) (bank 2, sensor 2) detects the oxygen content in the
exhaust gas downstream of the three way catalytic converter (TWC) during stoichiometric air/fuel ratio

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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© 2005 Mitchell Repair Information Company, LLC.

feedback control. The front secondary HO2S controls the air/fuel ratio from the front A/F sensor output
voltage so that the TWC efficiency is optimized.

After current is applied to the front secondary HO2S heater, if the front secondary HO2S sensor output
continues low (lean) during feedback control, a malfunction is detected and a DTC is stored.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The front secondary HO2S output voltage is 0.293 V or less for at least 40 seconds.

Driving Pattern

1. Start the engine. Let it idle 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, the MIL comes on and the DTC and the freeze frame data are stored in the
PCM memory.

Conditions for clearing the MIL

Execution

Continuous

Sequence

None

Duration

40 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

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

Condition

Minimum

Maximum

Engine coolant temperature

156°F (69°C)

Intake air temperature

15°F (-9°C)

Fuel trim

0.73

1.47

Fuel feedback

Closed loop

No active DTCs

P0107, P0108, P0112, P0113, P0117, P0118, P0153, P0154,
P0155, P0161, P0174, P0175, P0300, P0301, P0302, P0303,
P0304, P0305, P0306, P0340, P0344, P0401, P0404, P0443,
P0496, P0627, P1077, P1078, P1128, P1129, P1174, P2197,
P2240, P2241, P2247, P2249, P2254, P2255, P2413, P2630,
P2631, P2646, P2647, P2648, P2649, P2A03

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:03 PM

Page 47

© 2005 Mitchell Repair Information Company, LLC.

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 P0158 (162): ADVANCED DIAGNOSTICS

DTC P0158: FRONT SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S (BANK 2,
SENSOR 2)) CIRCUIT HIGH VOLTAGE

Fig. 36: Front Secondary Heated Oxygen Sensor (Secondary HO2S (Bank 2, Sensor 2)) High Voltage —
Circuit Diagram

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:03 PM

Page 48

© 2005 Mitchell Repair Information Company, LLC.

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