LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> VinFast >> 2023 >> VF9 Eco >> Repair and Diagnosis (Single Page) >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Vehicle Control Diagnosis (10 Of 10) >> DTC U1255-98: Invalid Data Received From Active Grill Shutter "A" Control Module - Component Or System Over Temperature >> VinFast DTC Guided Repair Instruction >> Operating Conditions
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Operating Conditions

Enable Criteria Ignition is active
Failure Criteria AGS_1: AGS feedback for overtemprature error (Interface: AGM_1_Sta_OverTemp [0x31] on LIN1) == 1 "error" (AGS temprature > 130°C ± 15K).
AGS_2: AGS feedback for temperature error (Interface: Temperature_error [0x31] on LIN1) == 1 "error"
Failure/Mature Time 100 ms
Pass Criteria AGS_1: AGS feedback for overtemperature error (Interface: AGM_1_Sta_OverTemp [0x31] on LIN1) == 0 "no error" (AGS temprature < 130°C ± 15K).
AGS_2: AGS feedback for temperature error (Interface: Temperature_error [0x31] on LIN1) == 0 "no error"
Pass/De-mature Time 200 ms
Failure Aging 40 driving cycles without failure
scientia non olet · About LEMON Manuals