DTC Diagnosis Procedure

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.

CHECK COOLING FAN OPERATION
With CONSULT
1. Turn ignition switch ON.
2. Perform "FAN DUTY CONTROL" in "ACTIVE TEST" mode of "ENGINE" using CONSULT.
3. Check that cooling fan speed varies according to the percentage.
Without CONSULT
1. Activate IPDM E/R auto active test and check cooling fan motors operation, refer to Diagnosis Description .
2. Check that cooling fan operates.
Is the inspection result normal?

YES

GO TO 2.

NO

Proceed to Component Function Check .
CHECK COOLING SYSTEM FOR LEAK-1
Check cooling system for leak. Refer to System Inspection .

Is leakage detected?

YES

GO TO 3.

NO

GO TO 4.
CHECK COOLING SYSTEM FOR LEAK-2
Check the following for leak.
- Hose (Refer to System Inspection .)
- Radiator (Refer to Checking Radiator .)
- Water pump (Refer to Removal and Installation .)
Repair or replace malfunctioning part.
CHECK RADIATOR CAP
Check radiator cap.

Is the inspection result normal?

YES

GO TO 5.

NO

Replace radiator cap.
CHECK THERMOSTAT
Check thermostat. Refer to Removal and Installation .

Is the inspection result normal?

YES

GO TO 6.

NO

Replace thermostat. Refer to Removal and Installation .
CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to Component Inspection .

Is the inspection result normal?

YES

GO TO 7.

NO

Replace engine coolant temperature sensor. Refer to Removal and Installation .

CHECK MAIN 12 CAUSES

If the cause cannot be isolated, check the following.

Engine	Step	Inspection item	Equipment	Standard	Reference
OFF	1	Blocked radiator Blocked condenser Blocked radiator grille Blocked bumper	Visual	No blocking	--
	2	Coolant mixture	Coolant tester	Engine Coolant Recommendation
	3	Coolant level	Visual	Coolant up to MAX level in reservoir tank and radiator filler neck	System Inspection
	4	Radiator cap	Pressure tester	107 kPa (1.1 kg/cm ² , 16 psi) (Limit)	--
ON* ²	5	Coolant leaks	Visual	No leaks	System Inspection
ON* ²	6	Thermostat	Touch the upper and lower radiator hoses	Both hoses should be hot	Removal and Installation
ON* ¹	7	Cooling fan	CONSULT	Operating	Component Function Check
OFF	8	Combustion gas leak	Color checker chemical tester 4 Gas analyzer	Negative	--
ON* ³	9	Coolant temperature gauge	Visual	Gauge less than 3/4 when driving	--
ON* ³	9	Coolant overflow to reservoir tank	Visual	No overflow during driving and idling	System Inspection
OFF* ⁴	10	Coolant return from reservoir tank to radiator	Visual	Should be initial level in reservoir tank	System Inspection
OFF	11	Cylinder head	Straight gauge feeler gauge	0.1 mm (0.004 in) Maximum distortion (warping)	Removal and Installation
OFF	12	Cylinder block and pistons	Visual	No scuffing on cylinder walls or piston	Inspection After Disassembly

*1: Turn the ignition switch ON.

*2: Engine running at 3, 000 rpm for 10 minutes.

*3: Drive at 90 km/h (55 MPH) for 30 minutes and then let idle for 10 minutes.

*4: After 60 minutes of cool down time.

For more information, refer to Troubleshooting Chart .

INSPECTION END