CTS does affect the ISC, in normal use you will see the target idle value reduce as the engine warms up. The idle tables will only be activated when the throttle is closed and VSS is zero, you can usually raise RPM to around 1200rpm using the idle control feature, if you do that what is the ISC duty cycle? you may find that the idle control is not possible with any electrical loads active.
You should see ISC go to 100% during normal driving and then reduce gradually as you slow down, this is known as the 'dashpot effect' and is used when slowing down to prevent stalling.
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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine 2000 Suzuki Vitara 1.6 8V, many mods 2004 Suzuki Ignis 1.5VVT 4Grip 2006 Suzuki Jimny 1.3VVT JLX+ and many more.
Thanks for your reply. I just did a duty cycle check thru ISC connector by a meter today without using the a calibration feature.
With AC and all electric off, target idle is 799 rpm and I can get the duty cycle at 36% only (note that the bleed screw was fully CW or closed).
With AC ON, target idle is 1003 rpm and duty cycle rose to 50% so I didn't adjust anything.
Does this sound right? Or should I try the calibration feature?
I'm sure my ISC is working well and able to deliver the RPM according to the target idle. The only reason I was trying to tune up the idle because I had a problem while AC is ON and I am shifting the gear to D or R. The RPM was down to 400 and fluctuated between 500 and 800. This is getting worse if the CTS is hotter let's say over 88 C. Sometimes, the engine stalls and shut down.
Two quick questions please.
1. With RV software monitoring, I can see clearly that the target speed at 1003 rpm was down to 799 rpm when I shift the gear. If the target idle had remained 1003 rpm, the engine stall wouldn't have happened. No idea why Suzuki has not remained the target idle at 1003 RPM while AC is ON and the gear is being shifted.
2. Would CTS be part of the ECU algorithm in controlling the ISC? As mentioned, the hotter the CTS is, the worse the idle control is.
1. RPM control is used to test the IAC or ISC, it only operates at idle, you cannot change target idle on the 16V Vitara ECU.
2. Yes, again the controls only operate at idle
3. IAC calibration is not documented, my understanding is that it sets the IAC or ISC to 50% duty cycle and you then set the adjustment screw to achieve the correct idle speed. If your ISC is factory set then this function will probably not work.
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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine 2000 Suzuki Vitara 1.6 8V, many mods 2004 Suzuki Ignis 1.5VVT 4Grip 2006 Suzuki Jimny 1.3VVT JLX+ and many more.
Mine is Vitara 16V MPI, G16B engine. A few questions with regards to the controls feature on Rhinoview.
1. RPM control - If I set the target idle through here, will it change only temporarily? Currently, my target idle is 799 RPM without AC and 1003 with AC. Is there anyway I can lift up the target idle with AC on to 1100 RPM and program this into ECU?
2. I just recently noticed that - on the controls window, there are a few more functions i.e. EGR ON and OFF, Canister ON and OFF? Does that mean we can force it ON OFF for testing purpose?
3. What about the IAC calibration? how does it work? I presume when you mention IAC it means the ISC which is step motor controlled by ECU - is that correct?
