P0328

DTC P0328: Knock Sensor Circuit High

Knock Sensor Circuit:

CIRCUIT OPERATION
- The knock sensor (terminal No. 2) sends a signal voltage to the ECM (terminal No. 25).
- The ground terminal (terminal No. 1) is grounded with ECM (terminal No. 42).

TECHNICAL DESCRIPTION
- The knock sensor converts the vibration of the cylinder block into a voltage and outputs it.
- The ECM checks whether the voltage is within a specified range.

DTC SET CONDITIONS

Check Condition
- 2 seconds or more have passed since the engine starting sequence was completed.

Judgement Criterion
- Knock sensor output voltage has continued to be higher than 2.25 volts for 2 seconds.

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- Shorted knock sensor circuit or connector damage.
- ECM failed.

DIAGNOSIS

Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991910: Main Harness A

STEP 1. Check harness connector B-116 at the knock sensor and harness connector B-108 at ECM for damage.

Q: Is the harness connector in good condition?

YES : Go to Step 2.

NO : Repair or replace it. Refer to General (Electrical), Harness Connector Inspection. Then go to Step 3.

STEP 2. Check for short circuit to power supply between knock sensor connector B-116 (terminal No. 2) and ECM connector B-108 (terminal No. 25).

NOTE: Check harness after checking intermediate connector B-16. If intermediate connector is damaged, repair or replace it. Refer to General (Electrical), Harness Connector Inspection. Then go to Step 3.

Q: Is the harness wire in good condition?

YES : Replace the ECM. When the ECM is replaced, register the ID code. Refer to ID Code Registration Necessity Judgment Table or ID Codes Registration Judgment Table . Then go to Step 3.

NO : Repair it. Then go to Step 3.

STEP 3. Using scan tool MB991958, read the diagnostic trouble code (DTC).

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Erase the DTC.
4. Test drive under the following conditions:
- Engine speed: 3,000 - 5,000 r/min
- Engine load: 40 % or more
- Drive a minimum of 3 seconds after the above conditions have been met.

5. After completing the test drive, read the DTC. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is DTC P0328 set?

YES : Retry the troubleshooting.

NO : The inspection is complete.