4-3-2 & 5-1-3 (High Temperature Warning In ECU Box)

Code 4-3-2 is recorded if temperature in ECU box exceeds 185°F (85°C) for more than 18 seconds. Code 5-1-3 is recorded if temperature continues to rise and exceeds 203°F (95°C) for more than 18 seconds. If this problem is persistent, install accessory fan kit in ECU holder.