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I'm using an OBD reader with Elm327 v1.5 chip. I have made a software that reads vehicle speed (pid 010d). This software works ok on VW Transporter and some other cars but not on Isuzu D-max MY 2013->

The software tries the different protocols by selecting one protocol and then requesting pid 010d. If getting a valid response the selected protocol is kept and used when requesting next pid.

The problem with Isuzu D-Max 2013-> is that I do not get any valid response on any protocol. I have also tested with a software called OBD Auto Doctor and I got the same result.

The tested protocols and response messages are:

SAE J1850 PWM (41.6 kbit/s) Resp: NO DATA

SAE J1850 VPW (10.4 kbit/s) Resp:FB ERROR

ISO 9141-2 (5 baud init, 10.4 kbit/s) Resp:INIT: BUS ERROR

ISO 14230-4 KWP (5 baud init, 10.4 kbit/s) Resp: INIT: BUS ERROR

ISO 14230-4 KWP (fast init, 10.4 kbit/s) Resp: INIT: BUS ERROR

ISO 15765-4 CAN (11 bit ID, 500 kbit/s) Resp: CAN ERROR

ISO 15765-4 CAN (29 bit ID, 500 kbit/s) Resp: CAN ERROR

ISO 15765-4 CAN (11 bit ID, 250 kbit/s) Resp: CAN ERROR

ISO 15765-4 CAN (29 bit ID, 250 kbit/s) Resp: CAN ERROR

Is there anyone that has experience of ELM327 an Isuzu Dmax 2013 or newer. What protocol is this vehicle using? And does the vehicle follow the OBD standard?

  • Have you the opportunity to try on another Isuzu? Just to check whether you just have a car with a faulty obd. – Rory Alsop Mar 20 '17 at 14:41
  • Unfortenatly I do not have another Isuzu to test on. I have checked that the OBD connector is properly inserted. – Martin Mar 20 '17 at 14:48
  • I added longer delay when waiting for responce from the vehicle and that solved the problem. ATST64 (64*4 = 256ms) – Martin Aug 14 '17 at 14:03

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