Technical 50 www.aftermarketonline.net JUNE 2024 available from the steering module. However, code 01309 (19) was present in the data bus, and code u111100 in the instrument cluster (17). (see Fig.3 network scan) My next choice was to check the system fuses, do not rely on voltage or resistance conduct relevant load tests. The system pump can have up to a 60A inrush, with 30-35A continuous consumption. No faults here so down to the pump module. The FR has front fog lights so no access through the front bumper panel. I had to drop the pump via the three 8x1.5 mm bolts. Whenever I am faced with a comms failure, I always scope the CAN network before any disturbance. Using my PicoScope, I noted distortion across both CAN high and low. (see Fig.4 CAN distortion) My next action was to disconnect the module and re-check the network. Ensure you set a high sample rate; the scope bandwidth should have a least x10 the signal frequency to be examined. To be honest, my sample rate could have been a little higher! So high speed CAN 500k/bit scope min 5m/bit. We had a faulty module that was duly replaced with a genuine TWR pump module. Once fitted communication was restored however a DTC 00816 was present and could not be cleared, the steering assist was in default mode offering some assistance with dash warning still showing a system fault. An 00816 identifies power steering sensor open or short to B+, which is where the fun starts. The problem is a coding issue not a circuit problem. Looking on the internet most responses to this code either deliberately avoid the correct response or are uninformed guesses. Access module coding expect a current code 10110 update with 11250, upload to module, clear the DTC and steering should perform normally. A final little bit of advice… fill the power steering reservoir on the bench, seal the return circuit until you are ready to reconnect the hydraulic lines. Figure 3 Figure 3
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