Diagnostic Aids
WARNING: This page is about a different car, the 2008 Suzuki Swift +, 2008 Pontiac Wave, and 2008 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.
- If the owner complained of an overheating problem, it must be determined if the complaint was due to an actual boil over, or the engine coolant temperature gage indicated overheating. If the engine is overheating and the cooling fans are ON, the cooling system should be inspected.
- If the I/P fuse block fuse F18 or the engine fuse block fuse EF3 or main relay fuse EF2 (1.2L only), become open, blown, immediately after installation, inspect for a short to ground in the wiring of the appropriate circuit. If the fuses become open, blown, when the cooling fan is to be turned ON by the ECM, suspect a faulty cooling fan motor.
- The ECM will turn the cooling fans ON at low speed when the coolant temperature is 93°C (199°F). The ECM will turn the cooling fans OFF when the coolant temperature is 90°C (194°F).
- The ECM will turn the cooling fans ON at high speed when the coolant temperature is 97°C (207°F). The ECM will change the cooling fans from high speed to low speed when the coolant temperature is 94°C (201°F).
- The cooling fan circuit can be inspected quickly by disconnecting the ECM connector and grounding the low cooling fan control circuit. This should create low speed cooling fan operation with the ignition ON. By grounding the ECM low cooling fan relay and high cooling fan relay control circuits and turning the ignition ON, high speed cooling fan operation should be achieved.