Nissan Sentra Service Manual: Symptom diagnosis
OVERHEATING CAUSE ANALYSIS
Troubleshooting Chart
| Symptom | Check items | |||
| Cooling system parts malfunction | Poor heat transfer | Water pump malfunction | Worn or loose drive belt | — |
| Thermostat stuck closed | Engine coolant circulation | |||
| Damaged fins | Dust contamination or rock clogging | |||
| Mechanical damage | ||||
| Clogged radiator cooling tube | Excess foreign material (rust, dirt, sand, etc.) | |||
| Reduced air flow | Cooling fan does not operate | Fan shroud and motor as- High resistance to fan rota- sembly | — | |
| High resistance to fan rotation | ||||
| Damaged fan blades | ||||
| Damaged radiator shroud | — | Radiator shroud | — | |
| Improper engine coolant mixture ratio | — | Engine coolant viscosity | — | |
| Poor engine coolant quality | — | Periodic maintenance | — | |
| Insufficient engine coolant | Engine coolant leaks | Cooling hose | Loose clamp | |
| Cracked hose | ||||
| Water pump | Poor sealing | |||
| Radiator cap | Loose | |||
| Poor sealing | ||||
| Radiator | O-ring for damage, deterioration or improper fitting | |||
| Cracked radiator tank | ||||
| Cracked radiator core | ||||
| Reservoir tank | Cracked reservoir tank | |||
| Overflowing reservoir tank | Exhaust gas leaks into cooling system | Cylinder head deterioration | ||
| Cylinder head gasket deterioration | ||||
| Except cooling system parts malfunction |
— |
Overload on engine | Abusive driving | High engine rpm under no load |
| Driving in low gear for extended time | ||||
| Driving at extremely high speed | ||||
| Powertrain system malfunction |
— |
|||
| Installed improper size wheels and tires | ||||
| Dragging brakes | ||||
| Improper ignition timing | ||||
| Blocked or restricted air flow | Blocked radiator grille | Installed car brassiere | — | |
| Blocked bumper | ||||
| Blocked radiator | ||||
| Blocked condenser | Mud contamination or paper clogging | |||
| Installed large fog lamp | ||||
System description
DESCRIPTION
Engine Cooling System Schematic
CVT Models
Radiator
Water inlet
Reservoir tank
Thermostat
Engine oil cooler
Thermostat housing
Water pump
Cylinder head
Cylinder b ...
Periodic maintenance
ENGINE COOLANT
System Inspection
WARNING:
Do not remove the radiator cap when the engine is hot. Serious
burns could occur from high pressure
engine coolant escaping from the radiator.
Wr ...
Other materials:
Multiport Fuel Injection System or Engine Control System
Before connecting or disconnecting any harness connector for the
multiport fuel injection system or ECM:
Turn ignition switch to “OFF” position.
Disconnect negative battery terminal.
Otherwise, there may be damage to ECM.
Before disconnecting pressurized fuel line from ...
Regulatory Information
FCC Regulatory information
CAUTION: To maintain compliance with
FCC’s RF exposure guidelines, use only the
supplied antenna. Unauthorized antenna,
modification, or attachments could damage
the transmitter and may violate FCC regulations.
Operation is subject to the following two cond ...
Electric oil pump
Exploded View
Transaxle assembly
Electric oil pump sub harness
O-ring
Electric oil pump and motor assembly
CVT fluid
Removal and Installation
REMOVAL
Remove neighboring parts of electric oil pump.
Remove electric oil pump sub harness.
Remove electric oil pump and motor a ...
