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EC-180 < DTC/CIRCUIT DIAGNOSIS > [VQ35DE] P0128 THERMOSTAT FUNCTION P0128 THERMOSTAT FUNCTION DTC Logic INFOID:0000000005536591 DTC DETECTION LOGIC NOTE: Engine coolant temperature has not risen enough to open the thermostat even though the engine has run long DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct- Turn ignition switch OFF and wait at least 10 seconds. 2. Turn ignition switch ON. 3. Turn ignition switch OFF and wait at least 10 seconds. TESTING CONDITION: ° C (14 ° F) or higher. • For best results, perform at engine coolant temperature of –10 ° C (14 ° F) to 56 ° C (133 ° F). • Before performing the following procedure, do not add fuel. >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE With CONSULT-III 1. Turn A/C switch OFF. 2. Turn blower fan switch OFF. 3. Turn ignition switch ON. 4. Select “COOLAN TEMP/S” in “DATA MONITOR” mode with CONSULT-III. 5. Check the indication of “COOLAN TEMP/S” ° C (133 ° F), go to next step. If it is above 56 ° C (133 ° F), cool down the engine to less than 56 ° C (133 ° F). Then go to next steps. 6. Start engine. 7. Drive vehicle for 10 consecutive minutes under the following conditions. CAUTION: Always drive vehicle at a safe speed. ° C (167 ° F) within 10 minutes, turn ignition switch OFF because the test result will be OK. 8. Check 1st trip DTC. With GST Follow the procedure “With CONSULT-III” above. YES >> Go to NO >> INSPECTION END DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0128 Thermostat function The engine coolant temperature does not reach • Thermostat stat • Engine coolant temperature sensor VHCL SPEED SE More than 56 km/h (35 MPH) |