303-03-140 Engine Cooling 303-03-140
DIAGNOSIS AND TESTING (CONTINUED)
E6862 EN 07/2001 2002 Bantam
Condition
Possible Sources
Action
• ECT sender unit.
• CHECK the ECT sender unit for
correct operation. REFER to
WDS to diagnose the system.
• ECT sensor.
• CHECK the ECT sensor for cor-
rect operation. REFER to
WDS
to diagnose the system.
• Cooling fan motor switch.
• CHECK the cooling fan motor
switch for correct operation.
REFER to WDS to diagnose the
system.
• PCM. • CHECK the PCM for correct op-
eration. REFER to
WDS to di
agnose the system.
• Circuit(s). • CHECK the circuit(s). REFER to
WDS to diagnose the system.
• Relay(s). • CARRY OUT the Relay Compo-
nent Test.
REFER to the Wiring
Diagrams.
Component Tests
Pressure Test
1. Remove the coolant expansion tank cap.
2. Install the special tools.
3. Pressurize the system to the coolant
expansion tank cap release pressure.
4. Observe the cooling system pressure tester
gauge reading for approximately two
minutes. The pressure should not drop
during this time. If the system holds pressure,
proceed to Step 5. If the system does not
hold pressure, check it thoroughly for coolant
leaks. If a coolant leak cannot be found,
check the engine for cylinder leakage.
R
EFER to Section 303-00. Repair any
coolant leaks and refill the system as
necessary.
5. Recheck the system by repeating Steps 3
and 4 at least twice.
Thermostat Test
Remove and inspect the thermostat, note its
opening temperature and immerse it in water.
Heat the water until that temperature is reached.
The thermostat should begin to open. If it does
not begin to open, install a new thermostat.
Continue to heat the water until the thermostat
fully opens, 5.8 mm or more off the valve seat. If
it does not fully open, install a new thermostat.
Radiator Leak Test, Removed From Vehicle
Clean the radiator thoroughly before leak testing
it to prevent contamination of the water in the test
tank. Leak test the radiator in clean water with
1.38 bar air pressure. Check it thoroughly for air
leaks. Install a new radiator if necessary.
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