Toyota Tundra. Manual — part 1193

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

Reference: Inspection using an oscilloscope

Fig. 112: KNK1 Signal Waveform

The correct waveform is as shown.

WAVEFORM REFERENCE

MONITOR DESCRIPTION

If the output voltage transmitted by the knock sensor remains low or high for more than 1 second, the ECM
interprets this as a malfunction in the sensor circuit, and sets a DTC.

The monitor for DTCs P0327, P0328, P0332 and P0333 begins to run when 5 seconds have elapsed since the
engine was started.

If the malfunction is not repaired successfully, DTC P0327, P0328, P0332 or P0333 is set 5 seconds after the
engine is next started.

MONITOR STRATEGY

MONITOR STRATEGY

Item

Content

Terminal

KNK1 - EKNK

KNK2 - EKN2

Equipment Setting

1 V/DIV. 1 msec./DIV.

Condition

Keep engine speed at 4000 RPM with warm engine

Related DTCs

P0327: Knock sensor (bank 1) range check (Low voltage)
P0328: Knock sensor (bank 1) range check (High voltage)
P0332: Knock sensor (bank 2) range check (Low voltage)
P0333: Knock sensor (bank 2) range check (High voltage)

Required Sensors/Components (Main)

Knock sensor

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

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

TYPICAL MALFUNCTION THRESHOLDS

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

TYPICAL MALFUNCTION THRESHOLDS

WIRING DIAGRAM

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

1 second

MIL Operation

Immediate

Sequence of Operation

None

Monitor runs whenever following DTCs not present

None

Battery voltage

10.5 V or more

Time after engine start

5 seconds or more

Knock sensor voltage

Less than 0.5 V

Knock sensor voltage

More than 4.5 V

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

Fig. 113: Knock Sensor 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 Techstream. Freeze frame data records the engine condition 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.

1. READ DTC OUTPUT (CHECK KNOCK SENSOR CIRCUIT)

a. Disconnect the aD1 connector.

b. Using lead wires, connect the connectors as follows:

CONNECTOR TERMINAL REFERENCE

Male Connector - Female Connector

Terminal 2 - Terminal 4
Terminal 5 - Terminal 6
Terminal 4 - Terminal 2
Terminal 6 - Terminal 5

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

c. Warm up the engine.

d. Run the engine at 3000 RPM for 10 seconds or more.

e. Connect the Techstream to the DLC3.

f. Turn the ignition switch ON and turn the Techstream ON.

g. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes.

h. Read the DTCs.

Result

RESULT CHART

B : Go to step 4

Fig. 114: Knock Sensor Circuit Diagram

A : Go to next step

2. CHECK HARNESS AND CONNECTOR (CONNECTOR - ECM)

a. Disconnect the aD1 connector.

Display

Proceed

To

DTC is same as when vehicle brought in (for example, P0327 and P0328 are output

again, or P0332 and P0333 are output again)

A

DTC is different from when vehicle brought in (for example, P0327 and P0328 are

output at first, but then P0332 and P0333 are output, or vice versa)

B

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra