Diagnostic Procedure: Notes

WARNING: This page is about a different car, the 2006 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.

CHECK COOLING FAN (CRANKSHAFT DRIVEN) OPERATION
1. Start engine and let it idle.
2. Make sure that cooling fan (crankshaft driven) operates normally.
OK or NG

OK (With CONSULT-II) : GO TO 2.

OK (Without CONSULT-II) : GO TO 3.

NG : Check cooling fan (crankshaft driven). Refer to "REMOVAL AND INSTALLATION (CRANKSHAFT DRIVEN TYPE) ".
CHECK COOLING FAN OPERATION
WITH CONSULT-II
1. Start engine and let it idle.
2. Select "COOLING FAN" in "ACTIVE TEST" mode with CONSULT-II.
3. Make sure that cooling fan operates at each speed (LOW/HI).
OK or NG

OK : GO TO 4.

NG : Check cooling fan control circuit. (Go to "PROCEDURE A ".)

Fig 1: CONSULT-II Display - ACTIVE TEST
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK COOLING FAN OPERATION
Without CONSULT-II
1. Perform IPDM E/R auto active test and check cooling fan motors operation, refer to "AUTO ACTIVE TEST ".
2. Make sure that cooling fan operates at each speed (Low/High).
OK or NG

OK : GO TO 4.

NG : Check cooling fan control circuit. (Go to "PROCEDURE A ".)
CHECK COOLING SYSTEM FOR LEAK
Refer to "CHECKING COOLING SYSTEM FOR LEAKS ".

OK or NG

OK : GO TO 5.

NG : Check the following for leak. Refer to "CHECKING COOLING SYSTEM FOR LEAKS ".
- Hose
- Radiator
- Radiator cap
- Reservoir tank
- Water pump
CHECK RESERVOIR TANK CAP
Refer to "CHECKING RESERVOIR CAP ".

OK or NG

OK : GO TO 6.

NG : Replace reservoir tank cap.
CHECK COMPONENT PARTS
Check the following.
- Thermostat. Refer to "WATER INLET AND THERMOSTAT ASSEMBLY ".
- Engine coolant temperature sensor. Refer to "COMPONENT INSPECTION ".
OK or NG

OK : GO TO 7.

NG : Replace malfunctioning component.
CHECK MAIN 12 CAUSES
If the cause cannot be isolated, go to "MAIN 12 CAUSES ARE OVERHEATING ".

: INSPECTION END