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HOMESERVICE MANUALSMAZDA2013MX-5 MIATA GRAND TOURING, AUTOMATIC TRANSREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISSYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM LF 2.0L]NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING [LF]
2013 Mazda MX-5 Miata Grand Touring, Automatic Trans

No. 17 Cooling System Concerns-Overheating [LF]

2013 Mazda MX-5 Miata Grand Touring, Automatic TransSECTION No. 17 Cooling System Concerns-Overheating [LF]
17  COOLING SYSTEM CONCERNS-OVERHEATING 
DESCRIPTION 
  • The engine runs at higher than normal temperature/overheats.
POSSIBLE CAUSE 
  • Improper coolant level
  • Blown fuses
  • Coolant leakage
  • 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
DIAGNOSTIC PROCEDURE

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 Turn the ignition switch to the ON position (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?		 Yes Go to the appropriate DTC inspection.
(See DTC TABLE [LF] ).
No Go to the next step.
3 Start the engine and idle it.
Verify state of the A/C compressor while turing on and off the air conditioner by switching the control panel.
Does the A/C compressor engage?		 Yes Go to Step 5.
No
4 Perform the Cooling Fan Control System Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [LF] ).
Does the cooling fan control system function properly?		 Yes Go to the next step.
No Repair or replace the malfunctioning part according to the inspection results.
5 Is the drive belt normal? Yes Go to the next step.
No Replace the drive belt.
(See DRIVE BELT REPLACEMENT [LF] ).
6 is there leakage around the heater unit in passenger compartment? Yes Inspect and service heater for leakage.
No Go to the next step.
7 Is there leakage at the coolant hoses and/or radiator? Yes Repair or replace the malfunctioning part according to the inspection results.
No Go to the next step.
8 Cool down the engine.
Remove the thermostat and inspect the operation.
(See THERMOSTAT REMOVAL/INSTALLATION [LF] ).
(See THERMOSTAT INSPECTION [LF] ).
Is the thermostat normal?		 Yes The engine coolant temperature and thermostat are normal, inspect engine block for leakage or blockage.
No Access the ECT PID.
Inspect for both ECT PID and temperature gauge readings.
If the temperature gauge on instrument cluster indicates normal range but the ECT PID is not same as temperature gauge reading, inspect the ECT sensor.
If temperature gauge on instrument cluster indicates overheating but the ECT PID is normal, inspect instrument cluster.
9
  • Verify test results.
    • If normal, return to diagnostic index to service any additional symptoms.

      (See SYMPTOM DIAGNOSTIC INDEX [LF] ).

    • If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.
      • If vehicle is repaired, troubleshooting completed.
      • If vehicle is not repaired or additional diagnostic information is not available, replace the PCM.

        (See PCM REMOVAL/INSTALLATION [LF] ).
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.