Acura RL. Instruction — page 19

Fig. 51: Knock Sensor (KS) — Circuit Diagram

General Description

The knock sensor is mounted on the engine block and detects engine knock. The vibrations caused by
knocking are converted into electrical signals through the piezo ceramic element. The powertrain control
module (PCM) controls the ignition timing based on the electrical signals. If the signals from the knock
sensor do not vary for a set time period, the PCM detects a malfunction and stores a DTC.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

No signals from the knock sensor are detected 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. Hold the engine speed at 3,000 — 4,000 rpm for at least 60 seconds.

Diagnosis Details

Conditions for illuminating the MIL

Execution

Continuous

Sequence

None

Duration

5 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

Engine speed

2,000 rpm

Engine coolant temperature

140°F (60°C)

No active DTCs

P0117, P0118

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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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 P0335 (4): ADVANCED DIAGNOSTICS

DTC P0335: CRANKSHAFT POSITION (CKP) SENSOR A NO SIGNAL

Fig. 52: Crankshaft Position Sensor A — Circuit Diagram

General Description

Crankshaft position (CKP) sensor A consists of a rotor and a semiconductor that detects rotor position.
When the engine starts, the rotor turns and the magnetic flux in the semiconductor changes. The changes of
magnetic flux are converted into pulsing signals to the powertrain control module (PCM). CKP sensor A
detects injection/ignition timing for each cylinder and engine speed.

If no pulsing signals are detected from CKP sensor A, a malfunction is detected and a DTC is stored.

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 74

© 2005 Mitchell Repair Information Company, LLC.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

No signals from CKP sensor A are detected while signals from CKP sensor B are detected 127 times in
succession.

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 P0339 (4): ADVANCED DIAGNOSTICS

DTC P0339: CRANKSHAFT POSITION (CKP) SENSOR A INTERMITTENT INTERRUPTION

Execution

Continuous

Sequence

None

Duration

DTC Type

One drive cycle, MIL ON

OBD Status

N/A

Condition

State of the engine

Running

No active DTCs

P0385, P0389

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 75

© 2005 Mitchell Repair Information Company, LLC.

Fig. 53: Crankshaft Position Sensor A — Circuit Diagram

General Description

Crankshaft position (CKP) sensor A consists of a rotor and a semiconductor that detects rotor position.
When the engine starts, the rotor turns and the magnetic flux in the semiconductor changes. The changes of
magnetic flux are converted into pulsing signals to the powertrain control module (PCM). CKP sensor A
detects injection/ignition timing for each cylinder and engine speed.

If an abnormal amount of pulsing signals are detected from CKP sensor A, a malfunction is detected and a
DTC is stored.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Execution

Continuous

Sequence

None

Duration

DTC Type

One drive cycle, MIL ON

OBD Status

N/A

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 76

© 2005 Mitchell Repair Information Company, LLC.

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