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Old 09-11-2003, 12:44 PM   #1
RafalW
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Default ODBII output question

Does anybody know if there is a power and a tach signal on ODBII in a STi? I am looking into DL90 and there is an option for ODBII module for Porsche to pick these signals from there.
I am wondering if it will work on STi.

Here is a page:
http://www.cb-racing.com/logger-ordering.htm

And this is a quote from my email:
Quote:
The RPM & Power adapter is only available on Porsche's. The OBDII plug on a Porsche has power and a tach signal coming to it. This is then converted into a signal for the DL90 to work.
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Old 09-11-2003, 01:34 PM   #2
ANZAC_1915
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Default

Most standard OBDII outputs are able to output a continous tach value, but it isn't a "signal pin" per se, you need to request it and decode the data.

However, you can find the tach signal on the ECU itself.

As to power, the closest thing is "load" which isn't exactly the same, nor is it an absolute measure.

To learn more about OBD-II and how it works, there is a pretty grognardy book from the SAE called HS-3000 which contains all the relevant specs.

Glenn
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Old 09-11-2003, 03:01 PM   #3
RafalW
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Here is an additional response I got:

Quote:
Yes 96+ have OBDII, but there are 16 pins on an OBDII connector and only 4 of them are used for OBDII. Manufacturers are allowed to put whatever they want on the other pins, hence porsche has put a tach signal on one of them. If you could provide me with the pinout information for a Subaru then something might be possible, but it definitely won't be the same as Porsche.
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Old 09-11-2003, 03:03 PM   #4
Eric SS
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swap and N20. gone. : (

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I'm pretty sure every manufacturer puts a tach output in the standard OBDII plug. It is important for their techs when they are working on the vehicles. Whether it is a direct tach lead or a different signal that gets converted to a tach signal once in the Scan Tool though I don't know.
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Old 09-11-2003, 04:03 PM   #5
ANZAC_1915
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I don't think the standard provides any "spare pins", I'd say it is all software.
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Old 09-11-2003, 10:52 PM   #6
z
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in ur Floriduh

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EDIT: engine revolution (RPMs), no HP or torque-


Here's what the service manual has to say about OBD-II output:


EN(STi)-25
ENGINE (DIAGNOSTICS)
OBD-II GENERAL SCAN TOOL
8. OBD-II General Scan Tool
A: OPERATION
1. HOW TO USE OBD-II GENERAL SCAN
TOOL
1) Prepare a general scan tool (OBD-II general
scan tool) required by SAE J1978.
2) Open the cover and connect the OBD-II general scan tool to data link connector located in the lower portion of instrument panel (on the driver’s side).
3) Using the OBD-II general scan tool, call up DTC and freeze frame data.


OBD-II general scan tool functions consist of:
(1) MODE $01: Current powertrain diagnostic data
(2) MODE $02: Powertrain freeze frame data
(3) MODE $03: Emission-related powertrain DTC
(4) MODE $04: Clear/Reset emission-related diagnostic information
(5) MODE $06: Request on-board monitoring test results for non-continuously monitored sys-tems
(6) MODE $07: Request on-board monitoring test results for continuously monitored systems
(7) MODE $09: Request vehicle information


Read out the data according to repair procedures.
(For detailed operation procedures, refer to the OBD-II General Scan Tool Operation Manual.)

NOTE:
For details concerning DTC, refer to the List of Di-agnostic
Trouble Code (DTC). <Ref. to EN(STi)-66, List of Diagnostic Trouble Code (DTC).>
2. MODE $01 (CURRENT POWERTRAIN DIAGNOSTIC DATA)
Refers to data denoting the current operating condition of analog input/output, digital input/output and/or the powertrain system.
A list of the support data and PID (Parameter Identification) codes are shown in the following table.
NOTE:
Refer to OBD-II general scan tool manufacturer’s instruction manual to access generic OBD-II PIDs (MODE $01).
EN-01163
PID Data Unit of measure
01 Number of emission-related powertrain DTC and malfunction indicator light status and diag-nosis support information —
03 Fuel system control status —
04 Calculated engine load value %
05 Engine coolant temperature °C
06 Short term fuel trim %
07 Long term fuel trim %
0B Intake manifold absolute pressure kPa
0C Engine revolution rpm
0D Vehicle speed km/h
0E Ignition timing advance °
0F Intake air temperature °C
10 Air flow rate from mass air flow sensor g/sec
11 Throttle valve absolute opening angle %
13 Check whether oxygen sensor is installed. —
15 Oxygen sensor output voltage and short term fuel trim associated with oxygen sensor V and %
1C Supporting OBD system —
24 A/F value and A/F sensor output voltage — and V
34 A/F value and A/F sensor current — and mA

Hope this helps

z

Last edited by z; 09-11-2003 at 11:41 PM.
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Old 09-11-2003, 11:36 PM   #7
rbahr
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Hi RafalW,

Let me know what you find out - I have a DL90 and would like to get this data as well.

Thanks

Ray
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Old 09-11-2003, 11:50 PM   #8
rbahr
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Hi,

I just went through the schematics. There is no easy way to get thengine speed out of the computer. The Tach and Speedometer information is derrived locally (in the instrument cluster) from some data - probably digital in nature sent to the instrument cluster from the ECU. I am unable to tell what kind of signal currently drives this. Also, best I can tell, none of the spare OBD II pins carry any useful information.

Ray
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Old 09-12-2003, 12:14 AM   #9
ANZAC_1915
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Typically there are tach and VSS (speed) signals going to the cluster from the ECU. The ECU is the most convenient place to get at them.
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Old 09-12-2003, 12:38 AM   #10
z
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in ur Floriduh

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OBD II reads the engine revolution (aka Tach, aka RPMs)
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