Hi Amit, congratulations on getting your car sorted out
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Originally Posted by amit_mechengg they have TECH1 and TECH2 which does all the detail analysis. |
The list price of the Tech-2 & Suzuki-Diagnostic-Unit is around 3.65 lakhs
So not all service centers have them.
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Originally Posted by amit_mechengg connected it to the tech2 and started the engine, the MAP SENSOR ERROR popped up. |
Funny, I had a similar issue this weekend in my Alto too. However, in my case the MIL, or Malfunction Indicator Light, lit up indicating a fault.
If the MIL comes on & you don't have a Tech-2 you can still troubleshoot the issue. There's a 6-pin female coupler inside the fuse & relay box in your engine-bay - this is called the monitor coupler. One of the 6 terminals in the coupler is called the diagnostics-switch-terminal & this needs to be grounded (you can do this with any normal wire).
I don't have any pics for now, but will upload some after I get my car back from the garage.
On correctly grounding the diagnostics terminal, the MIL will flash the error code - sort of like Morse code ! For example, the MAP sensor error code is 11 - you'll see two flashes, a pause, two flashes again, pause, & so on... Each sensor has it's own code & 12 is normal. In fact this was how the MIL error was diagnosed in my car. Went back home & checked the service manual & found that this was indeed the recommended procedure to troubleshoot MIL faults if you don't have access to a Tech-2.
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Originally Posted by amit_mechengg * one think i dint get. after all this blunder why doesnt the engine check light glow? whats the use if one doesnt come to know that his ecu is having errors? its people like me who critically hear the engine for every km i drive. what about people who just drive the car as it is ? there should be some system to alert. |
The service manual mentions that not all electronic systems are capable of turning on the MIL - one such system is the EPS. In these cases, you
have to use a Tech-2 for diagnosis.
I guess your MAP sensor issue was intermittent & the sensor was sending values which were incorrect, but within the range the ECU expects it to be - hence no MIL. Another problem could be your MIL circuit itself - the service manual in fact has a procedure to detect this too !
P.S. - Will post a pic of the monitor coupler & the terminal to ground in a couple of days...