TOYOBD1 This is the current application, it allows you to see and record the information listed below with an interval of about 1.3s between frames. this delay is inheritent of the Toyota OBD1 protocol and sadly we cannot make it any faster.
OBD1READ The tool needed to connect to you car,(No an OBD2 elm327 wont work instead ). Visit www.zf-scantools.com to order yours.
Here is how to hook OBD1READ to your car, please note that VF can be labeled VF1. Check the diagram present in the diag blox cover for exact connections.
On some cars, TE2 and E1 must be tied together into the DLC2 connector.(namely JZA80 and Lexus SC400)
INJ Injector opening duration in Millisecond for one engine Revolution
IGN Ignition advance angle in degrees before TDC, positive values indicate angles after TDC
IAC Percentage of opening of Idle air control valve
RPM Engine speed,please note that the OBD1 protocol cannot show speed above 6375 rpm :S
VAF/MAP/MAF This is the value measured by the metering system in volts, kpa or gr/sec depending on configuration
ECT Engine coolant temperature reading
TPS Throttle position sensor,range should be 0-90 degrees
SPD Vehicle speed sensor
STFT S.hort T.erm F.uel T.rim, it represents how much the ECU needs to compensate VS what he expected
MPG Fuel consumption calculation
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| Means that the A/C system is engaged |
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| Means that the acceleration enrichment mode is on |
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| Means that the after start enrichment mode is on |
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| Means that unknown function word 11 bit 2 is on |
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| Means that unknown function word 11 bit 3 is on |
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| Means that unknown function word 11 bit 7 is on |
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| Means that unknown function word 12 bit 6 is on |
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| Means that Idle mode is ON, generally different ignition advance and extensive usage of IACV, TPS closed or closing |
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| Means that knock sensor detects heavy knocking now |
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| Means that the neutral start switch is on |
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| Means that the ECU is now in open loop mode |
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| Means that an oxygen sensor is reading a lean air fuel ratio mixture |
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| Means that an oxygen sensor is reading a rich air fuel ratio mixture |
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| Means the ECU detects the starter is engaged |
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| Means that the ECU is in self diagnosis mode. it happens when the engine start and goes away when driving if the ECU suspects nothing wrong. |
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| Means the engine is in warm up mode |
Thermal Audio Alarm
When the engine water temp exceeds 100C or 212F and audio alarm will be heard telling you there is something wrong that you should take care of, RIGHT NOW.
Known Limits of Toyota OBD1
Protocol speed is 1.3s between frames( please remember this protocol dates back to the early 90s when that speed probably seemed sufficient). Another important limitation is that no engine speed above 6375 rpm will be displayed.
Communication Heartbeat
Useful for troubleshooting, this shows when a frame is sent from the ecu to toyobd1, if the ECU sends nothing there wont be an heartbeat at all.
About author
Toyobd1/OBD1READ was carried out in the winter of 20134-2014 by JF Breton with the 3VZ-FE in mind. Canadian programmer and toyophile mainly interested in all ECU stuff,3S-GTE celicas and strange projects.
