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1A-233 Engine General Information and Diagnosis: Troubleshooting WARNING !
Keep hands, tools, and clothing away from A/C condenser fan to help prevent personal injury. This fan
NOTE • Before performed troubleshooting, be sure to read the “Precautions of ECM Circuit Inspection”. special tool to ECM and/or the ECM connectors referring to “Inspection of ECM and Its Circuits”. • When A/C evaporator outlet air temp. is below 0 °C (32 °F), A/C remains OFF. This condition is not abnormal.
Step Action Yes No 1 Check DTC in ECM (Reception data check from BCM) OFF. 2) Turn ON ignition switch. Is there DTC U0140? Go to applicable DTC Go to Step 2. 2 DTC check of HVAC control module Is there DTC(s)? Go to applicable DTC Go to Step 3. 3 A/C switch signal circuit check respectively. A/C switch signal Is check result satisfactory? Go to Step 4. Check HVAC control 4 DTC check of ECT sensor circuit Is there DTC P0116, DTC P0117 or DTC P0118? Go to applicable DTC Go to Step 5. 5 Radiator cooling fan control system check Is radiator cooling fan started when A/C and blower speed Go to Step 11. Go to Step 6. 6 Radiator cooling fan control circuit check Are DTC P0480, DTC P0481 and/or DTC P0482 detected? Go to applicable DTC Go to Step 7. 7 Evaporator temperature sensor check Evaporator Temperature Sensor Inspection in Section Is resistance within specification? Go to Step 8. Faulty evaporator |