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HOMESERVICE MANUALSMAZDA20105 SPORT, 2.3 L, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 491 (SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM BP, BP WITH TC))NO.18 COOLING SYSTEM CONCERNS-RUNS COLDDIAGNOSTIC PROCEDURE
2010 Mazda 5 Sport, 2.3 L, Standard

Diagnostic Procedure

2010 Mazda 5 Sport, 2.3 L, StandardSECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
NO.18 COOLING SYSTEM CONCERNS-RUNS COLD [BP, BP WITH TC] DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1
  • Is customer complaint "Lack of passenger compartment heat" only?
 Yes Inspect A/C and heater system.
No Go to the next step.
2
  • Does engine speed continue at fast idle?
 Yes Go to symptom troubleshooting No.9 "NO.9 FAST IDLE/RUNS ON ".
No Go to the next step.
3 Yes Inspect condenser fan and main fan operation.
  • If both or either fan operate abnormally, inspect for following:
    • Main cooling fan relay is stuck closed.
    • Condenser fan relay is stuck closed.
    • Short to ground between main cooling fan relay and PCM terminal 2B
    • Short to ground between condenser fan relay and PCM terminal 2C
    • Circuit between main cooling fan relay and fan motor shorts to battery supply line
    • Circuit between condenser fan relay and fan motor shorts to battery supply line
No Access ECT V PID on WDS or equivalent.
Inspect for both ECT and temperature gauge on instrument cluster readings.
  • If temperature gauge on instrument cluster indicates normal range but ECT is not same as temperature gauge reading, inspect ECT sensor.
  • If temperature gauge on instrument cluster indicates cold range but ECT is normal, inspect temperature gauge and heat gauge unit.
4
  • Verify test results.
    • If okay, return to diagnostic index to service any additional symptoms.
    • 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 PCM.
RENDER: 1.0x

NO RELATED

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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.