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HA -146 HEATING, VENTILATION AND AIR CONDITIONING 1 2 1. Evaporator temp. sensor signal Ω SCMHA6540L 8 6.2 4.9 3.9 2 1.3 0.9 13.6 0 4 8 12 16 -10 0 5 10 15 30 40 50 Resistance (k Ω) T emper atur e( c) Fig 3) Specifications : Resistance value of evaporator temp. sensor as a function of temperature. Fig. 3 EQBF519F 4) Is the measured resistance within specifications in fig3? (tolerance limits ±3%) YES Go to "Check A/C Control Unit" procedure. NO Substitute with a known-good evaporator temp. sensor and check for proper operation. 2. Check A/C Control Unit 1) Engine "ON" 2) Disconnect evaporator temp. sensor. 3) Measure voltage between terminal "6" of A/C Control Unit and chassis ground. Specification : Approx. 5V |