Recent reports are highlighting a serious issue with newly purchased Konnwei Kw902 Obdii Adapters that could potentially harm your vehicle. Users have reported experiencing unusual errors, specifically I-Key malfunctions in Nissan Leaf models, immediately after plugging in these new adapters.
Upon investigating a recently acquired KONNWEI KW902, a significant change in the internal circuit board design was discovered compared to older, previously reliable models. The critical flaw lies in the incorrect resistor being used across the CAN bus. While the required specification is 120 ohms between pins 6 and 14, these faulty units are equipped with a 20-ohm resistor. This drastically lower resistance creates a near short circuit on the CAN bus, the communication network vital to your car’s operation.
It’s suspected that automated manufacturing processes may be to blame, with incorrect reels of resistors possibly loaded into the assembly line. This suggests a potentially widespread issue affecting a large number of newly manufactured Konnwei KW902 OBDII adapters currently available on the market.
Therefore, before connecting a new Konnwei KW902 OBDII adapter to your Nissan Leaf or any other vehicle, it is crucial to verify the resistance between pins 6 and 14. If the measurement deviates from the required 120 ohms, immediately return the adapter to the seller and request a replacement that meets the correct specifications.
Locating pins 6 and 14 on the Konnwei KW902 OBDII adapter for resistance testing.
Short-circuiting the CAN bus is a severe problem. If you observe any abnormal behavior from your vehicle while using any OBDII adapter, cease using it immediately and check the resistance. Never operate your vehicle under these conditions.
The CAN bus is not merely a diagnostic port; it’s the central nervous system of your car, controlling essential functions. Communication disruptions or shorts on the CAN bus can have unpredictable and potentially damaging consequences for your vehicle’s systems.
Confirmation of this 20-ohm resistor defect has been received from multiple users, including reports from AliExpress purchases. If you also find a 20-ohm resistor in your new Konnwei KW902 OBDII adapter, please report it to help raise awareness of this critical issue.
Here’s a look inside the adapter, courtesy of Mark Stevens, highlighting the incorrectly installed 20-ohm resistor in red. For technically skilled users, removing this faulty resistor can resolve the problem. However, for most users, returning the product for a correct replacement is the recommended course of action.
