Diagnostic Procedure: Notes

WARNING: This page is about a different car, the 2005 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
1. OK (With CONSULT-II): GO TO 2.
2. OK (Without CONSULT-II): GO TO 3.
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 operate at each speed (LOW/HI).
OK or NG
1. OK: GO TO 4.
2. 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 operate at each speed (Low/High).
OK or NG
1. OK: GO TO 4.
2. 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
1. OK: GO TO 5.
2. NG: Check the following for leak. Refer to "CHECKING COOLING SYSTEM FOR LEAKS ".
  - Hose
  - Radiator
  - Water pump
CHECK RADIATOR CAP
Refer to "CHECKING RESERVOIR CAP ".

OK or NG
1. OK: GO TO 6.
2. NG: Replace radiator cap.
CHECK THERMOSTAT
Refer to "WATER INLET AND THERMOSTAT ASSEMBLY ".

OK or NG
1. OK: GO TO 7.
2. NG: Replace thermostat
CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to "COMPONENT INSPECTION ".

OK or NG
1. OK: GO TO 8.
2. NG: Replace engine coolant temperature sensor.
CHECK MAIN 12 CAUSES
If the cause cannot be isolated, go to "MAIN 12 CAUSES OF OVERHEATING ".
1. >> INSPECTION END