hali410-Brunei

I'm looking for 2nd opinion since I suspect its the car battery.
Wife's A4 won't crank, blinking at the transmission lights at the instrument cluster.
After some time leaving the ignition on, the blinks disappear and engine able to crank and start. This happens intermittently.

I did diagnosing and got this faults;-

Address 01: Engine
17925 - Power Supply Relay for ECU (J271 or J363): Electrical Malfunction
P1517 - 008 - Implausible Signal - Intermittent

Address 02: Auto Trans
005975 - Supply Voltage: Open Circuit
P1757 - 000 - - - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 0
Fault Frequency: 37
Time Indication: 0

Freeze Frame:
RPM: 96 /min
RPM: 0 /min
(no units): 1.0
Torque: 0.0 Nm
Temperature: 79.0°C
T.B. Angle: 0.0°
Bin. Bits: 0101 0 0

049408 - No Communication with Engine Control Module (SAE:ECM/PCM)
U0100 - 000 - - - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 0
Fault Frequency: 138
Time Indication: 0

Freeze Frame:
RPM: 96 /min
RPM: 0 /min
(no units): 1.0
Torque: 0.0 Nm
Temperature: 79.0°C
T.B. Angle: 0.0°
Bin. Bits: 0101 0 0


Anyone can help?

Gavin-AudiUSAParts

If your in the US the B7 A4 was not equipped with the 1.8T motor. Canada maybe?

As for your issue, sounds like possible water intrusion in the ECM box.

600whpA4

It was not sold in NA. He is most likely in some European country. I have a friend that lives in Greece that owns a B7 A4 1.8t.


Have you tried starting the car in Neutral?

hali410-Brunei

Yup. tried that. does not want to start when the transmission indications at the instrument cluster is blinking.

hali410-Brunei

Any idea how the water may penetrate to the ECU box? The cars about 62000 Km. It never happened before. Just recently.
The ECU box should be tighten enough and closed so no dirt or even water to enter right?

hali410-Brunei

I am guessing its the battery is weak. I tried to jump start the battery, It suddenly worked. Could it be possible that when the battery is weak, the relay picks up low current and disallow the car to be started?

hali410-Brunei

on 2nd thought, it may be condensation at the ECU box. looking back I was using the air condition and using the "Arrow-Up" button instead of the cabin button (dunno what it called).