DIAGNOSTIC PROCEDURE
COOLING SYSTEM CONCERNS-OVERHEATING DIAGNOSTIC PROCEDURE TABLE
POSSIBLE CAUSE
A/C system operation is improper
Improper water/anti-freeze mixture
Fans reverse rotation
Poor radiator condition
Thermostat malfunction
Radiator hoses damage
Improper or damaged radiator cap
Cooling fan is inoperative.
Coolant overflow system malfunction
Improper tension of drive belt
Drive belt damage
STEP
INSPECTION
RESULTS
ACTION
1
Inspect the following:
Engine coolant level
Coolant leakage
Water and anti-freeze
mixture
Radiator condition
Collapsed or restricted
radiator hoses
Radiator pressure cap
Overflow system
Fan rotational direction
Fuses
Are all items normal?
Yes
Go to the next step.
No
Service if necessary.
Repeat Step 1.
2
Connect the M-MDS or
equivalent to the DLC-2.
Turn the ignition switch to the
ON position (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?
Yes
DTC is displayed:
Go to the appropriate
DTC inspection.
(See
DTC TABLE
[LF]
.)
No
No DTC is displayed:
Go to the next step.
3
Start the engine and idle it.
Turn the A/C switch on and set
Yes
Go to Step 5.
No
Inspect for the
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:10 PM
Page 87
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