2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0327,P0328,P0332,P0333; Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor); 2006 MY LX470 [05/2005

Last Modified: 4-30-2014	6.6 C	Doc ID: RM000000SVT00AX
Model Year: 2006	Model: LX470	Prod Date Range: [05/2005 - ]
Title: 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0327,P0328,P0332,P0333; Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor); 2006 MY LX470 [05/2005 - ]

DTC

P0327

Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

DTC

P0328

Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)

DTC

P0332

Knock Sensor 2 Circuit Low Input (Bank 2)

DTC

P0333

Knock Sensor 2 Circuit High Input (Bank 2)

DESCRIPTION

A flat type knock sensor (non-resonant type) has a structure that can detect vibrations over a wide band of frequencies: between approximately 6 kHz and 15 kHz.

Knock sensors are fitted onto the engine block to detect engine knocking.

The knock sensor contains a piezoelectric element which generates a voltage when it becomes deformed.

The voltage is generated when the engine block vibrates due to knocking. Any occurrence of engine knocking can be suppressed by delaying the ignition timing.

DTC No.

DTC Detection Condition

Trouble Area

P0327

P0332

Output voltage of knock sensor 1 or 2 is 0.5 V or less

(1 trip detection logic)

Short in knock sensor 1 or 2 circuit

Knock sensor 1 or 2

P0328

P0333

Output voltage of knock sensor 1 or 2 is 4.5 V or more

(1 trip detection logic)

Open in knock sensor 1 or 2 circuit

Knock sensor 1 or 2

HINT:

When any of DTCs P0327, P0328, P0332 and P0333 are set, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is delayed to its maximum retardation. Fail-safe mode continues until the ignition switch is turned OFF.

Reference: Inspect using an oscilloscope

The correct waveform is as shown.

Item

Content

Terminals

KNK1 - EKNK

KNK2 -EKN2

Equipment Settings

0.01 to 10 V/DIV.

0.01 to 10 msec./DIV.

Conditions

Keep engine speed at 4,000 rpm with warm engine

MONITOR DESCRIPTION

The knock sensor, located on the cylinder block, detects spark knock. When spark knock occurs, the piezoelectric element of the sensor vibrates. When the ECM detects a voltage in this frequency range, it retards the ignition timing to suppress the spark knock.

The ECM also senses background engine noise with the knock sensor and uses this noise to check for faults in the sensor. If the knock sensor signal level is too low for more than 10 seconds, or if the knock sensor output voltage is outside the normal range, the ECM interprets this as a fault in the knock sensor and sets a DTC.

MONITOR STRATEGY

Related DTCs	P0327: Knock sensor (Bank 1) open/short (Low voltage) P0328: Knock sensor (Bank 1) open/short (High voltage) P0332: Knock sensor (Bank 2) open/short (Low voltage) P0333: Knock sensor (Bank 2) open/short (High voltage)
Required Sensors/Components (Main)	Knock sensor (Bank 1 and 2)
Required Sensors/Components (Related)	-
Frequency of Operation	Continuous
Duration	1 second
MIL Operation	Immediate
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever following DTCs not present	None
Battery voltage	10.5 V or more
Time after engine start	5 seconds or more

TYPICAL MALFUNCTION THRESHOLDS

Knock Sensor Range Check (Low voltage) P0327 and P0332:

Knock sensor voltage

Less than 0.5 V

Knock Sensor Range Check (High voltage) P0328 and P0333:

Knock sensor voltage

More than 4.5 V

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

DTCs P0327 and P0328 are for the bank 1 knock sensor circuit.

DTCs P0332 and P0333 are for the bank 2 knock sensor circuit.

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1.	READ OUTPUT DTC (CHECK KNOCK SENSOR CIRCUIT)

(a) Disconnect the EC1 connector.

(b) Using lead wires, connect the EC1 connectors as follows.

Male Connector - Female Connector

Terminal 4 - Terminal 1

Terminal 5 - Terminal 6

Terminal 1 - Terminal 4

Terminal 6 - Terminal 5

(d) Race the engine at 3,000 rpm for 10 seconds or more.

(e) Check for DTCs.

Display	Proceed to
DTCs same as when vehicle brought in P0327, P0328 → P0327, P0328 or P0332, P0333 → P0332, P0333	A
DTCs different from when vehicle brought in P0327, P0328 → P0332, P0333 or P0332, P0333 → P0327, P0328	B

GO TO STEP 5

2.	CHECK HARNESS AND CONNECTOR (CONNECTOR - ECM)

(a) Check harness and connector .

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT ECM

(a) Disconnect the EC1 connector.

(b) Turn the ignition switch ON.

Standard voltage:

Tester Connection	Specified Condition
EC1 male connector 4 - EC1 male connector 5	4.5 to 5.5 V
EC1 male connector 1 - EC1 male connector 6	4.5 to 5.5 V

REPLACE ECM

4.	CHECK FOR INTERMITTENT PROBLEMS

NOTICE:

The fault may be intermittent. Check the harness and connectors carefully, and reset.

END

5.	INSPECT KNOCK SENSOR

(a) Disconnect the EC1 connector.

(b) Measure the resistance of the EC1 female connector.

Standard resistance:

Tester Connection	Specified Condition
EC1 female connector 4 - 5	120 to 280 kΩ
EC1 female connector 1 - 6	120 to 280 kΩ

CHECK FOR INTERMITTENT PROBLEMS

6.	CHECK HARNESS AND CONNECTOR (CONNECTOR - KNOCK SENSOR)

(a) Check harness and connector .

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE KNOCK SENSOR