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2008 Vauxhall Corsa 1.3 CDTI ECU fault

Hello Maic could you please give me a pointer to the problem I am having with the above ECU and DTC code P2146-02 Capacitor Voltage 1 Low Voltage.

I have checked the all capacitor with a capacitance meter and the values are within tolerance. The voltage from the 2 blue capacitors in the photo is 72 Volts, and the voltage across the three Orange is 12 Volts . As you can see from the photo, there is no water damage on this ECU. Thank You in advance.

1 comment

2 Comments

Maic Salazar Diagnostics

Feb 06, 2023

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Hi mark2256,

The fault code is for fuel injector supply voltage open circuit. That could be a bad injector, injector driver or a open in the circuit (wiring). What test have you perform in the vehicle?

mark2256

Feb 06, 2023

Replying to

Hi Maic, thank you for the reply. I checked the injector loom to see if is open circuit and is good, also checked injector resistances 4 Ohms on each, and just to be sure I tried 4 known good injectors but fault still persists. I have also carried out a voltage and currant draw on injector no 1 with a scope and just get a 12v straight line on both, so this point to ECU fault.