Toyota Tundra 2005 Service - Repair - Maintenance page 900

MONITOR DESCRIPTION
The knock sensor located on the cylinder block detects spark knock.
When spark knock occurs, the sensor pick−up vibrates in a specific frequency range. When the ECM detects
the voltage in this frequency range, it retards the ignition timing to suppress the spark knock.
If there is a defect in the knock sensor or an open or short circuit, the voltage level will deviate outside the
normal operating range. The ECM interprets this deviation as a defect in the knock sensor and sets a DTC.
Example:
When the knock sensor voltage output is less than 0.5 V, or more than 4.5 V, and if either the condition contin-
ues for more than 3 sec.
MONITOR STRATEGY
Related DTCs R l t d DTC
Required sensors/components
Frequency of operation
Duration
MIL operation
Sequence of operation
TYPICAL ENABLING CONDITIONS
Item It
The monitor will run whenever this DTC is
not present
Battery voltage
Time after engine start
Ignition switch
Starter
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria
Knock sensor range check (Low voltage) P0327, P0332:
Knock sensor voltage
Knock sensor range check (High voltage) P0328, P0333:
Knock sensor voltage
DIAGNOSTICS −
P0327
P0328
P0332
P0333
Main sensors/components
Related sensors/components
Continuous
1 sec.
Immediate
None
Minimum
10.5 V
5 sec.
ENGINE (2UZ−FE)
Knock sensor (Bank 1) range check (Low volt-
age)
Knock sensor (Bank 1) range check (High volt-
age)
Knock sensor (Bank 2) range check (Low volt-
age)
Knock sensor (Bank 2) range check (High volt-
age)
Knock sensor
Crankshaft position sensor, Camshaft position
sensor, Engine coolant temperature sensor,
Mass air flow meter
Specification
See page DI−437
ON
OFF
Threshold
Less than 0.5 V
More than 4.5 V
DI−627
Maximum
−
−