Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Infiniti FX50. However, it is still accessible from the selected car via links, so may be relevant.

CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection M95. Refer to Ground Inspection in "CIRCUIT INSPECTION ".
  Is the inspection result normal?
  
  YES: GO TO 2.
  
  NO: Repair or replace ground connection.

CHECK KNOCK SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

Disconnect knock sensor harness connector and ECM harness connector.

Check the continuity between knock sensor harness connector and ECM harness connector.

DTC	Knock sensor			ECM		Continuity
DTC	Bank	Connector	Terminal	Connector	Terminal	Continuity
P0327, P0328	1	F212	2	F110	35	Existed
P0332, P0333	2	F213	2	F110	35	Existed

Also check harness for short to ground and short to power.
Is the inspection result normal?

YES: GO TO 4.

NO: GO TO 3.

DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors F49, F211
- Harness for open or short between knock sensor and ECM
  : Repair open circuit or short to power in harness or connectors.

CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Check the continuity between knock sensor harness connector and ECM harness connector.

DTC	Knock sensor			ECM		Continuity
DTC	Bank	Connector	Terminal	Connector	Terminal	Continuity
P0327, P0328	1	F212	1	F110	40	Existed
P0332, P0333	2	F213	1	F110	44	Existed

Also check harness for short to ground and short to power.
Is the inspection result normal?

YES: GO TO 6.

NO: GO TO 5.

DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors F49, F211
- Harness for open or short between ECM and knock sensor
  : Repair open circuit, short to ground or short to power in harness or connectors.
CHECK KNOCK SENSOR
Refer to "COMPONENT INSPECTION ".

Is the inspection result normal?

YES: GO TO 7.

NO: Replace malfunctioning knock sensor. Refer to "EXPLODED VIEW ".
CHECK INTERMITTENT INCIDENT
Refer to "INTERMITTENT INCIDENT ".

: INSPECTION END