Below are some possible causes for damaging an ECU.
- Spiked by careless welding, i.e. MIG welding without disconnecting the battery. True/False.
True. When welding on cars there are two basic rules to follow: Always unhook the Positive and Negative cables from the battery terminals. Set a grounding clamp as close as possible to the area around you are welding with a clean connection.
- Enclosure seal damaged and with obvious sign of water ingress
True. If the enclosure seal is cracked or damaged, water or other substances have a way of getting into the compartment and damaging the ECU
- Obvious signs of mechanical damage to the enclosure
True. Mechanical damage can destroy the ECU depending on what and how the damage was occurred in the first place.
Often the ECU will be misdiagnosed as faulty, usually because the technician is inexperienced in fault finding.
- Faults are much more likely to be with connections or sensors. True/False.
True. A chipped rotor tooth, damaged sensor or cracked or broken connection hose will send no, or false information to the ECU. Also, as the ECU has hundreds, or even thousands of processes at a time, it is much more common that a sensor or connection has become faulty rather then the ECU itself being faulty.
Discuss how these ECU issues should be incorporated into diagnostic practices to test an ABS system.
When diagnosing faults with the ABS system, make sure all sensors and in working order and no damage has occurred to the connection hose. Also checking the condition of the coil in the wheel sensor for open circuits may lead to the ECU getting false information. If able, acquire a scan tool and check for faulty circuits before replacing parts. Also make sure the wheel sensor air gap should be around 0.4mm to 1mm.
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