The Delphi Delco Multec HSFI-2.x / HDRC engine management system for 1.6 litre (Z16SE) engines in particular, is used in various Vauxhall models. How can you tell there might be something wrong with this system? The engine failure light (MIL) might illuminate or various other messages might appear on the instrument cluster. The car goes into emergency (limp) mode or the engine can jerk and no longer run on all cylinders.
Faults in the ECU can be identified by a test drive or reading the Diagnostic Trouble Codes. The system’s operation can be verified by measuring live data and checking the wiring. Pay special attention to the supply voltages and grounds by verifying the electric’s diagram. Checking the input and output signals from the ECU is particularly important as most of the faults occur here.
This Delphi Delco Multec ECU is screwed on to the side of the cylinder head. This subjects the ECU to vibrations and heat, causing components to fail.
Common faults are lack of control of the ignition coil, the injectors and the idle speed motor. Malfunctions can also occur in the 5 volt circuit, the accelerator
pedal, throttle valve or fuel pump relay.
A malfunctioning ECU will have a major impact on other control units in the vehicle. It can result in error messages in, for example, the ABS system, the TCU and / or the instrument cluster.
A defective ECU can - depending on the severity and influence of the internal fault - cause other faults like a non-starting engine, the engine running irregularly, insufficient power, an illuminated engine failure light (MIL), etc. Failure to repair can cause a failure of the MOT test or engine damage.
Always remove the ECU according to the manufacturer’s instructions. Always remove the ground [-] terminal from the battery before removing the ECU. This prevents any damage due to polarity reversal. And always follow the manufacturer's instructions when installing the ECU. ACtronics adds a code card with instructions on how to get the ECU operating in the car after a remanufacture. Please, follow the instructions on this code card. Clear any error codes that are might still be present.
The ECU always gets an Entry Test upon arrival. If the fault is verified the ECU will be remanufactured. After this an End Of Line (EOL) test is performed to confirm that all faults have been resolved and the ECU is functioning as intended.