Troubleshooting

DTC P0328 KNOCK SENSOR 1 CIRCUIT HIGH INPUT (BANK 1 OR SINGLE SENSOR)

CIRCUIT DESCRIPTION

DTC Detecting Condition:

The flat type knock sensor (non-resonant type) has a structure that can detect vibrations in a wide frequency, from about 6 kHz to 15 kHz, and has the following features.

Knock sensors are fitted on the right bank and left bank of the cylinder block to detect the engine knocking. Each sensor contains a piezoelectric element which generates a voltage when it becomes deformed. This occurs when the cylinder block vibrates due to knocking. If engine knocking occurs, the ignition timing is retarded to suppress it.

HINT: If the ECM detects the DTC P0325, P0327 and P0328, it enters the fail-safe mode in which the corrective retarded angle value is set to the maximum value.

Reference: Inspection by using the oscilloscope.
After warning up, run the engine at 4,000 rpm, check the waveform between terminals KNK1 and EKNK of the ECM connector.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

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 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 sec. and if the knock sensor output voltage is out of the normal range,the ECM interprets this as a fault in the knock sensor and sets a DTC.

Wiring Diagram:

Step 1:

Step 2 - 3:

Step 4 - 5:

INSPECTION PROCEDURE

HINT: Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

CHECK FOR INTERMITTENT PROBLEMS

Hand-held tester only:
Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect when the ECM is in check mode with hand-held tester. In check mode, the ECM uses 1 trip detection logic, which has a higher sensitivity to malfunctions than normal mode (default), which uses 2 trip detection logic.
a. Clear the DTCs (See step 2).
b. Set the check mode (See step 3).
c. Perform a simulation test.
d. Check the connector and terminal.
e. Wiggle the harness and connector.