Tech Forum

Subject: PDM35 V2 – floating inputs, LED glow and signal leakage after upgrade from PDM25

Hello Hardwire team,

I recently upgraded from a PDM25-V3 to a PDM35 V2 (firmware 1.4.0, configurator 1.4.0) on a FuelTech FT600 race car. Overall the PDM35 is a big step up (fast update rate, CAN start works instantly, much better logging), but I ran into several issues that I never had with the PDM25 and had to fix with extra wiring.

Setup:

- PDM35 V2, FW 1.4.0

- FuelTech FT600 + FT Input Expander on CAN

I have a problem i changed upgraded my pdm to 25 old version to 35 new version and i created a problem with the lights all car and shift light ect i have inputs and outputs leaking and leds a glowing a little, on the inputs setting theres a pull resistor but i cant switch it on any help pls

Jocelyn

I'm troubleshooting an electrical issue on my S13 KA24DET using a Wiring Specialties Pro chassis and engine harness, Link ECU, and PDM15 with an 8-button CANbus keypad and digital dash.

The original PDM experienced issues after I discovered a connector filled with water, with corroded pins and a slight burnt smell. I subsequently found that the PDM was not supplying proper 12V to the C6 output on the green connector.

I replaced the PDM and reloaded the configuration file. The replacement worked for approximately five laps on track before the keypad and digital dash shut off again.

Current symptoms and findings:

• C6 is commanded ON in the PDM software but measures 0V.

• I've confirmed 0V directly at the PDM's C6 output pin and at the keypad/dash end of the harness.

Im working on a PWM fan control strategy and im running into an issue with the way that the PWM mapping is done in the outputs. The fan i have is a spal 18 inch 850w fan from a 2019 camaro SS. This fan requires 10% to stay on and 90% for full speed, below 10% or above 90% sets an error code.

This is my current mapping that i have and i have no way of setting 10% or 90% as the baseline in comparison to the coolant temperature. I will probably need to make another 2d table to create an artificial 10-90% bottom and top threshold. One suggestion i could make to solve this issue is to allow adjustability of the scalars (the 0-100% numbers on the left of the value inputs) This would allow for much easier interpolation and setting top and bottom thresholds. (Have a project…