Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001HT3A |
Model Year Start: 2020 |
Model: Corolla |
Prod Date Range: [03/2019 - 11/2022] |
Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P0327,P0328; Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor); 2020 - 2023 MY Corolla [03/2019 - 11/2022] |
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)
|
DESCRIPTION
A flat type knock control sensor (non-resonant type) has a structure that can detect vibration between approximately 5 and 15 kHz.
The knock control sensor is fitted onto the engine block to detect engine knocking.
The knock control 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. The occurrence of engine knocking can be suppressed by delaying the ignition timing.
HINT:
When DTC P0327 or P0328 is stored, 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.
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
MIL
|
Memory
|
Note
|
P0327
|
Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
|
Output voltage of knock control sensor is less than 0.5 V for 1 second or more (1 trip detection logic).
|
-
Short in knock control sensor circuit
-
Knock control sensor
-
ECM
|
Comes on
|
DTC stored
|
DTC for Mexico Models
- Applies
|
P0328
|
Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)
|
Output voltage of knock control sensor is higher than 4.5 V for 1 second or more (1 trip detection logic).
|
-
Open in knock control sensor circuit
-
Knock control sensor
-
ECM
|
Comes on
|
DTC stored
|
DTC for Mexico Models
- Applies
|
Reference: Inspection using an oscilloscope
HINT:
The correct waveform is as shown.
ECM Terminal Name
|
Between KNK1 and EKNK
|
Tester Range
|
1 V/DIV., 1 ms./DIV.
|
Condition
|
Engine speed maintained at 4000 rpm after warming up engine
|
MONITOR DESCRIPTION
If the output voltage transmitted by the knock control sensor remains low or high 1 second or more, the ECM interprets this as a malfunction in the sensor circuit, and stores a DTC.
The monitor for DTCs P0327 and P0328 begins to run when 5 seconds have elapsed since the engine was started.
MONITOR STRATEGY
Related DTCs
|
P0327: Knock control sensor range check (low voltage)
P0328: Knock control sensor range check (high voltage)
|
Required Sensors/Components (Main)
|
Knock control sensor
|
Required Sensors/Components (Related)
|
-
|
Frequency of Operation
|
Continuous
|
Duration
|
1 second
|
MIL Operation
|
Immediate
|
Sequence of Operation
|
None
|
TYPICAL ENABLING CONDITIONS
Monitor runs whenever the following DTCs are not stored
|
None
|
All of the following conditions are met
|
-
|
Time after engine start
|
5 seconds or more
|
Battery voltage
|
10.5 V or higher
|
Ignition switch
|
ON
|
Starter
|
Off
|
TYPICAL MALFUNCTION THRESHOLDS
P0327
Knock control sensor voltage
|
Less than 0.5 V
|
P0328
Knock control sensor voltage
|
Higher than 4.5 V
|
COMPONENT OPERATING RANGE
Knock control sensor voltage
|
0.5 to 4.5 V
|
CONFIRMATION DRIVING PATTERN
-
Connect the Techstream to the DLC3.
-
Turn the ignition switch to ON.
-
Turn the Techstream on.
-
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
-
Turn the ignition switch off and wait for at least 30 seconds.
-
Turn the ignition switch to ON.
-
Turn the Techstream on.
-
Start the engine and wait 5 minutes.
-
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
-
Read the pending DTCs.
HINT:
-
If a pending DTC is output, the system is malfunctioning.
-
If a pending DTC is not output, perform the following procedure.
-
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
-
Input the DTC: P0327 or P0328.
-
Check the DTC judgment result.
Techstream Display
|
Description
|
NORMAL
|
-
DTC judgment completed
-
System normal
|
ABNORMAL
|
-
DTC judgment completed
-
System abnormal
|
INCOMPLETE
|
-
DTC judgment not completed
-
Perform driving pattern after confirming DTC enabling conditions
|
N/A
|
-
Unable to perform DTC judgment
-
Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
|
HINT:
-
If the judgment result shows NORMAL, the system is normal.
-
If the judgment result shows ABNORMAL, the system has a malfunction.
-
If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs.
Click here
HINT:
-
If a permanent DTC is output, the system is malfunctioning.
-
If no permanent DTC is output, the system is normal.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
HINT:
Read Freeze Frame Data using the Techstream. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. 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 VALUE USING TECHSTREAM (KNOCK FEEDBACK VALUE)
|
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the Techstream on.
(d) Warm up the engine.
(e) Enter the following menus: Powertrain / Engine and ECT / Data List / Knock Feedback Value.
Powertrain > Engine and ECT > Data List
Tester Display
|
Knock Feedback Value
|
(f) Read the value while driving the vehicle.
OK:
The value changes.
Malfunction does not occur
|
Knock Feedback Value changes
|
Malfunctions occur
|
Knock Feedback Value does not change
|
HINT:
The Knock Feedback Value change can be confirmed by running the engine with a high load, for example, by activating the air conditioning system and racing the engine.
NG
|
|
|
2.
|
CHECK TERMINAL VOLTAGE (POWER SOURCE OF KNOCK CONTROL SENSOR)
|
*a
|
Front view of wire harness connector
(to Knock Control Sensor)
|
(a) Disconnect the knock control sensor connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
E1-2 - E1-1
|
Ignition switch ON
|
4.5 to 5.5 V
|
OK
|
|
|
3.
|
INSPECT KNOCK CONTROL SENSOR
|
(a) Inspect the knock control sensor.
Click here
HINT:
Perform "Inspection After Repair" after replacing the knock control sensor.
Click here
4.
|
CHECK HARNESS AND CONNECTOR (KNOCK CONTROL SENSOR - ECM)
|
(a) Disconnect the knock control sensor connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
E1-2 - C77-122 (KNK1)
|
Always
|
Below 1 Ω
|
E1-1 - C77-121 (EKNK)
|
Always
|
Below 1 Ω
|
E1-2 or C77-122 (KNK1) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|