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Technical Seicento ECU and Star Trek punto

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Technical Seicento ECU and Star Trek punto

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Bubble1100

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Hi. I am hoping Neil Barnacle or a similar tech wizard can help.
My 1999 seicento is giving Air temp sensor error and Injector driver error when I use the star trek punto as advised and a VAGcom cable with the mod for fiats. I have it connected to a laptop with serial port and the latency set to the lowest possible.
The car will rev when stationary but when I drive it it holds back suddenly when the accelerator is pressed. The management light is on so it may be in get you home mode. I have changed the throttle body for another with temp sensor and injector driver included and star trek punto gave the same errors. Could it be associated wiring or is it possible that I am getting a bad reading for some reason?
 
Bubble1100 said:
Hi. I am hoping Neil Barnacle or a similar tech wizard can help.
My 1999 seicento is giving Air temp sensor error and Injector driver error when I use the star trek punto as advised and a VAGcom cable with the mod for fiats. I have it connected to a laptop with serial port and the latency set to the lowest possible.
The car will rev when stationary but when I drive it it holds back suddenly when the accelerator is pressed. The management light is on so it may be in get you home mode. I have changed the throttle body for another with temp sensor and injector driver included and star trek punto gave the same errors. Could it be associated wiring or is it possible that I am getting a bad reading for some reason?
Click to expand...

I do not know or remember start trek punto that well, but:

1. Does the car run better now?

2. Did you clear the errors?
 
hi there,

forgotten to reply to my visitor message. But the star trek doesn't clear the message once the sensor gets the "right" reading the management light will goes off by itself.

This sounds to me there is some other sensor at fault which causes the 2 sensors to have wrong reading?

Ming
 
Bubble1100 said:
Is that what star trek punto means when it highlights injector driver? The ECU end and not the injector itself?
Click to expand...

I've not used star trek, but know that an injector driver and injector are different things. It could suggest a wiring fault between the ECU and the injector / throttle body.

Ensure that all the earths are clean, check that the ECU is connected firmly.
 
Ta. Have checked for continuity between injector/air temp and ECU and all ECU grounds and they are good. Will check main earth (think its from the gearbox to body). Could a re-flash of EPROM in ECU sort it if the injector driver is doing something wrong when manifold pressure changes?
 
An injector driver isn't like a device driver on a computer, it's a bit of hardware in the ECU. It's very rare that they fail/become faulty on these ECUs and it's even odder that it's showing an AIT sensor fault as well.

Did this just happen out of the blue, or did something prompt it? Jump starting / flat battery etc?
 
The car had this problem when I got it unfortunately so I don't know how the problem occured but the car has only done 30K. It's annoying that I can't get FiatECUscan to work as it's OBD1. I connected pin 1 to 7 in the VAGcom cable in order to connect to ABS ECUs as it says previous threads on here but I'm not sure if that is all I need to do to get correct readings from star trek.
 
Here are the screen caps for NB.
Ta
 

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Yeah. Had to install winzip as it wouldn't let me post a rar. Thanks for your help.
 

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Best guess on this, Bubble? The wiring going into the throttle body - which carries the injector and the air temp sensor - has been snagged or maybe trapped somewhere... has the inlet been in bits? The injector driver refers - as far as I know; the documents aren't clear - to the circuit, rather than parts within the ECU. That's why I'm suspicious of the loom in that area. NEil
 
Also - the fact that the air temp tracks the water temp exactly as it warms up and then sets solid is indicative of the fact that the air temp sensor isn't doing anything useful.

The injector can't be short circuit all the time or it wouldn't run at all, but if it's intermittent it would account for hunting revs.

Doubly suspicious of that wiring loom.

Neil
 
I suspected this could be the case so I checked for continuity between the air sensor and injector and ECU and the signal ground and earth on the loom and they were ok. The throttle body has been off and the gasket between it and the manifold was split but not in terrible condition. I connected pins 1-7 on my VAGcom cable as I think my car has ABS but no PAS or airbags and I haven't done any other mods like cutting the K-line as I am not sure of that part. Is it that I've done something wrong and hence am getting incorrect sensor readings from STpunto?
 
Nah, you're getting proper readings. The temp readings are doing just what they should in the absence of sane data from the air temp - track water and then sit at 38.

I don't have a 1200 to play with but from memory the wires poke through the gasket at the throttle body - I'm pretty sure there's damage somewhere around there. I don't know if there's an earth wire in there but if there is a crushed wire could be causing an invisible earth.

Neil
 
there is a little grommet holding the injector wire as it goes back into the tb, it can be placed the wrong way around and in some case bare wire and earth it upon vibration. im unsure if this even realates but its worth a check.
 
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