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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 372 (On-Board Diagnostic (HVAC)) >> DTC 21 >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DTC 21 DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1
  • Inspect airflow mode actuator.
  • Is it okay?
 Yes Go to next step.
No Replace airflow mode actuator.
2
  • Is resistance between climate control unit terminals 1U and 1I more than 4.6 kilohms  ?
 Yes Go to next step.
No Repair wiring harness. (Short circuit)
3
  • Disconnect climate control unit connectors (24-pin, 12-pin).
  • Is resistance between climate control unit terminals 2C and 1I less than 28.7 kilohms? 
 Yes Go to next step.
No Repair wiring harness. (Open circuit)
4
  • Is resistance between climate control unit terminals 2C and 1U less than 25.1 kilohms  ?
 Yes Replace climate control unit.
No Repair wiring harness. (Open circuit)
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