Car Information: 2009 VW
lavida 1.6 car with 110KM miles on it, CLS engine and 5-speed manual
transmission
Car Trouble: Check engine light on and air
conditioner (I call AC in the following parts) not cold enough.
Check and Analysis: firstly have a basic check about the
AC, at that time the temperature is 69.8F (21°c), but feel the cooling speed is
very slow, the cold air from the outlet is not cold enough.
3 Trouble Codes Found: Connect VAS
5054A VW Audi diagnostic tool to diagnose Engine control unit J220,
and read out 3 trouble codes: 12408 P3078 002 -Throttle Control Airflow at Idle
too Low, static state; VAS
5054A - Cooling Fan Relay 1 Control Circuit, intermittent and 06470
P1946 008 Control Module 1 for Coolant Fan voltage has error / open circuit,
static state.
Troubleshoot the Error: after carefully check, I find the cooling fan can’t turn after open the AC, it is relevant to the AC not cooling enough, in another word, as long as the fan trouble is exclude, the cooling trouble can be solved.
Troubleshoot the Error: after carefully check, I find the cooling fan can’t turn after open the AC, it is relevant to the AC not cooling enough, in another word, as long as the fan trouble is exclude, the cooling trouble can be solved.
When I use hand to turn fan, I feel not too much
resistance, but find the fan blade quantity is not enough, then check the large
capacity fuse SA6（40 A）at the top of the battery and find it is
melt, connect the 12V light the two ends of the broken fuse, the light is on,
it means the circuit has ground point, take down the NO.4 connector of the
cooling fan, the light not on, it means the short circuit point not in the
circuit, but inside the fan control unit J293 shown as following picture.
Trouble Solved: Replace the cooling fan control unit and SA6 fuse, delete trouble code, check engine light off.
Trouble Solved: Replace the cooling fan control unit and SA6 fuse, delete trouble code, check engine light off.
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