Diagnosis Procedure

WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DTC PRIORITY
If DTC U1000 is displayed with DTC P0607, first perform the confirmation procedure (trouble diagnosis) for DTC P0607.

Is DTC P0607 detected?

YES

Perform diagnosis of P0607. Refer to DTC Description .

NO

GO TO 2.

CHECK ENGINE COMMUNICATION CIRCUIT

Turn ignition switch OFF.
Disconnect ECM harness connector.
Disconnect electric intake valve timing control module harness connector.

Check the continuity between ECM harness connector and electric intake valve timing control module harness connector.

ECM		Electric intake valve timing control module		Continuity
Connector	Terminal	Connector	Terminal
E32	189	F105	25	Existed
	190		24

Also check harness for short to power and short to ground.

Is the inspection result normal?

YES

GO TO 3.

Repair or replace error-detected parts.

CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident .

Is the inspection result normal?

YES

GO TO 4.

NO

Repair or replace error-detected parts.
REPLACE ELECTRIC INTAKE VALVE TIMING CONTROL MODULE
Replace electric intake valve timing control module. Refer to Removal and Installation .

GO TO 5.
PERFORM DTC CONFIRMATION PROCEDURE
1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Erase DTC.
4. Perform DTC Confirmation Procedure.
  See DTC Description .
5. Check 1st trip DTC.
Is the DTC U1000 displayed again?

YES

GO TO 6.

NO

INSPECTION END
REPLACE ECM
Replace ECM. Refer to Removal and Installation .

INSPECTION END