a little help - OBD specification

[r]

i am doing a project for my level 3 course and need to get my hands on some stuff .if anyone could help me out I am doing a project on using the RASPBERRY PI and OBD 1, I am after the data sheets/technical spec for OBD 1 1997 nissan micra hope u lot can help as i  have a limited amount of time left to get this imformation i am trying to use a raspberry pi to read the binary data coming out the OBD port.

[Rerouter]

Here are the trouble codes for a toyota avensis (different vehicle but may overlap)

OBD1 Codes 1 Normal Condition. 2 Air Flow Meter signal. 3 Ignition signal. 4 Engine Coolant Temperature Sensor signal. 5 Oxygen Sensor. 6 RPM signal (Crank Angle Pulse). 7 Throttle Position Sensor signal. 8 Intake Air Temperature Sensor signal. 9 Vehicle Speed Sensor signal. 10 Starter signal. 11 Switch signal. 11 ECU/ECM. 12 Knock Control Sensor signal. 12 RPM signal. 13 Knock Control CPU (ECM). 13 RPM signal. 14 Turbocharger Pressure. 14 Ignition signal. 21 Oxygen Sensor. 22 Engine Coolant Temperature Sensor signal. 23 Intake Air Temperature Sensor signal. 24 Intake Air Temperature Sensor signal. 25 Air-Fuel Ratio Lean. 26 Air-Fuel Ratio Rich. 27 Sub Oxygen Sensor signal. 28 No. 2 Oxygen Sensor signal. 31 Air Flow Meter signal (Vacuum Sensor signal). 32 Air Flow Meter signal. 34 Turbocharger Pressure signal. 35 Turbocharger Pressure Sensor signal. 35 HAC Sensor signal. 41 Throttle Position Sensor signal. 42 Vehicle Speed Sensor signal. 43 Starter signal. 51 Switch signal. 52 Knock Sensor signal. 53 Knock Sensor signal. 54 Inter-cooler ECM signal. 71 EGR System. 72 Fuel Cut Solenoid signal. 78 Fuel Pump Control signal. 81 TCM Communication. 83 TCM Communication. 84 TCM Communication. 85 TCM Communication.

As for how to decode it, i've not been able to turn up anything more than it being a (early) variant on OBD2
here is something else that may help http://www.eobd2.eu/data/3111eu_Manual.pdf (it lists the 5 types of protocols commonly used which may help you,

[Neverther]

Reading binary data might be a fun trick, but have you considered using something like ELM327 to handle the protocol (if the one used by the car is included, page 25 on datasheet)?

If you still dont know howto handle the protocol, use one of those USB ELM327 bricks and sniff the serial data when you connect it using some diagnostics software.

Protocol might be ISO 9141-2, ISO/DIS 14230-4 (KWP2000) which is supported by elm.

[r]

Reading binary data might be a fun trick, but have you considered using something like ELM327 to handle the protocol (if the one used by the car is included, page 25 on datasheet)?

If you still dont know howto handle the protocol, use one of those USB ELM327 bricks and sniff the serial data when you connect it using some diagnostics software.

Protocol might be ISO 9141-2, ISO/DIS 14230-4 (KWP2000) which is supported by elm.

have tried one off the modules and had no luck but looking at the data sheet my get my self the chip on it own to see if i can get it to work