P0328
2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0327,P0328,P0332,P0333: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
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 the engine block vibrates due to knocking. Any occurrence of engine knocking can be suppressed by delaying the ignition timing.
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: Inspection using an oscilloscope
The correct waveform is as shown.
MONITOR DESCRIPTION
The knock sensor, located on the cylinder block, detects spark knock. When a 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
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
Knock Sensor Range Check (Low voltage) P0327 and P0332:
Knock Sensor Range Check (High voltage) P0328 and P0333:
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. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
PROCEDURE
1. READ VALUE USING DTC OUTPUT (CHECK KNOCK SENSOR CIRCUIT)
(a) Disconnect the Bd1 connector.
(b) Using lead wires, connect the connectors as follows.
(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 (IG) and turn the Techstream on.
(g) Select the following menu items: Powertrain / Engine and ECT / Trouble Code.
(h) Read the DTCs.
Result:
(i) Reconnect the Bd1 connector.
B -- INSPECT KNOCK SENSOR
A -- Continue to next step.
2. CHECK HARNESS OR CONNECTOR (Ba1 CONNECTOR - ECM)
(a) Disconnect the Bd1 connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Check for open
Check for short
(d) Reconnect the Bd1 connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (Ba1 CONNECTOR - ECM)
OK -- Continue to next step.
3. INSPECT ECM
(a) Disconnect the ECM connector.
(b) Turn the ignition switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:
(d) Reconnect the ECM connector.
NOTE: Fault may be intermittent. Check the wire harness and connectors carefully and retest.
NG -- REPLACE ECM
OK -- CHECK FOR INTERMITTENT PROBLEMS
4. INSPECT KNOCK SENSOR
(a) Disconnect the Bd1 connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(c) Reconnect the Bd1 connector.
NG -- CHECK HARNESS AND CONNECTOR (Ba1 CONNECTOR - KNOCK SENSOR)
OK -- CHECK FOR INTERMITTENT PROBLEMS
5. CHECK HARNESS AND CONNECTOR (Ba1 CONNECTOR - KNOCK SENSOR)
HINT:
- If DTC P0327 or P0328 has changed to P0332 or P0333, check the knock sensor circuit on the right bank side.
- If DTC P0332 or P0333 has changed to P0327 or P0328, check the knock sensor circuit on the left bank side.
(a) Disconnect the Bd1 connector.
(b) Disconnect the knock sensor connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Check for open
Check for short
(d) Reconnect the Bd1 connector.
(e) Reconnect the knock sensor connectors.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (Ba1 CONNECTOR - KNOCK SENSOR)
OK -- REPLACE KNOCK SENSOR