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My maruthi omni valve.ISC (omni MPFI modified) is burnt frequently

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6ya6ya
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Posted on Jan 02, 2017

caroldon
  • 17129 Answers

SOURCE: hello, I am having Maruthi

Th engine must be prroperly tuned for the LPG if this was fitted externally . If this was factory fitted please get a proper fuel setting done on the gas , check the spark plugs , the intensity , and also the timing.

Posted on May 12, 2011

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1 Answer

Throtel body isc sensor problem


code p 0505 refers to idle speed contril(ISC) system malfunction===causes wiring--isc/iac valve---throttle motor--throttle valve tight /sticking--ecm
poses the question did you replace too much and still missed the fault ( wiring connections )

Jun 29, 2015 | Cars & Trucks

2 Answers

I have a the check code p0507 on my car Nissan altima coupe. Can someone help me with this


code p0507 refers to idle sped control (ISC) system--rpm higher than expected==causes --wiring--isc actuator--iac valve--throttle motor--throtle valve tight/sticking--ECM
it also refers to idle air control (IAC) system --circuit low==causes--wiring short to ground--IAC valve--ECM

Nov 12, 2014 | Cars & Trucks

1 Answer

Loud idle running hot in park but not in drive


double posted
post RPM in both modes,
it must be the same
the ISC idle controls system controls idle at all times.
post RPM. 800 is normal. the exact valve is in the FSM
and posted under the hood in USA.
no country stated in 4000s posts so.... well, gee....
here, open the hood, look up, see EPA vacuum map
that is also the the engine size and type , and most state the normal
hot RPM clearly there, and is in the FSM.

here is the acid test. hot.
in park hot, rpm 800 if not the ISC fuction is dead
"idle speed controls"
good? yes.
then select drive. if RPM drops ISC is malfing.
now back to park. (all this is in the FSM to read)
now 800 hot. you turn on all heavy electrical loads
the rpm does not drop. Head lights + heater fan, and defrost.
all these test he ISC, if it fails its bad.
what does bad mean, that means its out of control
and you do further testing to find the reasons.

vast reasons.
Ill name 3:
intake air leaks. aka vacuum leaks.
ISC valve dirty , clean it.
throttle cables , misadjusted.
cold start air valve stuck open hot.





Nov 25, 2013 | 2006 Jeep Grand Cherokee

1 Answer

2002 honda civic code p0505


Error Code: P0505
Fault Location:
Idle Speed Control (ISC) System - Malfunction
Possible Cause:
-Wiring harness.
-Idle speed control (ISC) actuator/Idle air control valve (IAC) valve.
-Throttle valve tight/sticking.
-Engine control module (ECM).

May 13, 2013 | Honda Civic Cars & Trucks

2 Answers

Fault code 33 on 5afe corolla


Error code 3 3 - Idle Speed control ValveOpen or short in Idle Speed Control Valve (ISC). Replace ISC Valve

Oct 19, 2012 | 1999 Toyota Corolla

1 Answer

Hello, I am having Maruthi Omni LPG, for the past 3 months I am facing vehicle jerking problem due to misfire. I changed the Ignition coil ,but now also the problem arises


Th engine must be prroperly tuned for the LPG if this was fitted externally . If this was factory fitted please get a proper fuel setting done on the gas , check the spark plugs , the intensity , and also the timing.

May 12, 2011 | 1998 Suzuki Esteem

1 Answer

I keep hearing that I need to find and pull fuse 14 on my 96 subaru legacy 2.2L to try and reset the AT Oil Temp light that is flashing at start-up. The lid is missing, so I have no idea where this fuse...


Yes that is right:

Current trouble codes shown on the display are cleared by turning the ignition switch OFF after conducting self-diagnosis operation. Previous trouble codes, however, cannot be cleared since they are stored in the ECU memory which is operating on the back-up power supply. These trouble codes can be cleared by removing fuse 14 (located under the right lower portion of the instrument panel).

  • The No. 14 fuse is located in the line to the memory back-up power supply of the TCU and ECU (MPFI). Removal of this fuse clears the previous trouble codes stored in the TCU and ECU (MPFI) memory.
  • Be sure to remove the No. 14 fuse for at least the specified length of time. Otherwise, trouble codes may not be cleared.
When the Engine Control Module (ECM) , battery terminals, etc. are disconnected after memory is cleared, idling speed may increase. This is not considered a problem because the ISC Valve duty controlled learning value has been cleared. To return the engine to idling speed, idle for approximately 2 minutes with air conditioner "OFF".

Here is fuse #14 loc in panel Now its hard to see, but they go from the top left from 1 - 7 then it repeats for the next row 8 - 14. SO 14 is 2nd row from the top last one on right side.
118890618 118890619

Mar 09, 2011 | Subaru Legacy Cars & Trucks

1 Answer

What does code P0505 mean


This code seems to be "Idle speed control (ISC) system malfunction". Possible causes are wiring,ISC actuator/IAC valve,throttle motor,throttle valve tight or sticking, ECM. Hope this info is useful.

Nov 08, 2010 | 1998 Mitsubishi Galant

2 Answers

My idle drops everytime i come to a complete stop and even when i put it into reverse and also sometimes the car shuts down...


Idle Air Control (IAC) Valve OPERATION The ECM is programmed with specific engine speed values to respond to different engine conditions (coolant temperature, air conditioner on/off, etc.). Sensors transmit signals to the ECM which controls the flow of air through the bypass of the throttle valve and adjusts the idle speed to the specified value. Some vehicles use an Idle Speed Control (ISC) valve while others use an Air Valve (AV) or Idle Air Control (IAC) valve to control throttle body by-pass air flow. TESTING 2S-ELC Engine
  1. With the engine running and the coolant temperature below 140°F (60°C), pinch off the Air Valve hose and verify that the idle is reduced by no more than a 100 rpm.
  2. Unplug the valve wire connector and measure the coil resistance with an ohmmeter. It should be 40-60 ohms with the coolant temperature at 176°F (80°C) and the air valve closed.
  3. If not as specified, replace the valve. 3S-FE and 5S-FE Engines NOTE: The idle speed must be set correctly before testing the ISC valve.
  4. Bring the engine to normal operating temperature with transmission in N.
  5. Using a jumper wire, connect the terminals TE1 and El of the check connector (DLC 1). Fig. 1: Attach a jumper wire to the terminals TE1 and E1 in the DLC 1 89554g46.gif

  6. The engine rpm should rise to 900-1300 rpms for 5 seconds. Check that it returns to idle speed. If rpm is as specified, the valve is functioning properly.
  7. If rpm did not function as specified, stop the engine and disconnect the jumper wire.
  8. Disengauge the ISC valve connector.
  9. Using an ohmmeter, measure the resistance between the +B terminal (middle terminal) and the ISC1 - ISC2 (3S-FE) and the ISCC - ISCO (5S-FE) outer terminals. Fig. 2: Attach an ohmmeter and measure the resistance between the three terminals - 3S-FE engine 89554g49.gif
    Fig. 3: Attach an ohmmeter and measure the resistance between the three terminals - 5S-FE engine 89554g47.gif

  10. The resistance should be 16-17 ohms on the 3S-FE engine and 19.3-22.3 ohms on the 5S-FE engine.
  11. If not as specified, replace the ISC valve.
1MZ-FE Engine NOTE: The idle speed must be set correctly before testing the valve. Make sure the A/C is off during testing. Fig. 4: The IAC valve is attached to the lower portion of the throttle body 89554p46.jpg
  1. Bring the engine to normal operating temperature with transmission in N.
  2. Using a jumper wire, connect the terminals TE1 and El of the check connector (DLC 1).
  3. The engine rpm should rise to 1000 rpms for 5 seconds. Check that it returns to idle speed. If rpm is as specified, the valve is functioning properly.
  4. If rpm did not function as specified, stop the engine and disconnect the jumper wire.
  5. Disengage the ISC valve connector.
  6. Using an ohmmeter, measure the resistance between the +B terminal (middle terminal) and the RSC and RSO outer terminals. Fig. 5: Attach an ohmmeter and measure the resistance between the three terminals - 1MZ-FE engine 89554g48.gif

  7. The resistance should be 21-28.5 ohms on a hot engine.
  8. If not as specified, replace the ISC valve.
2VZ-FE and 3VZ-FE Engines
  1. Disengage the ISC valve connector.
  2. Using an ohmmeter, measure the resistance between the B1 terminal (lower middle terminal) and the S1 or S3 (lower outer terminals), and between B2 terminal (upper middle terminal) and the S2 or S4 (upper outer terminals). Fig. 6: ISC terminal identification - 2VZ-FE and 3VZ-FE engines 89554g50.gif

  3. If the resistance is not 10-30 ohms, replace the ISC valve.
  4. Apply battery voltage to terminals B1 and B2 while repeatedly grounding S1, S2, S3, S4, S1 in sequence. Check that valve moves toward the closed position. Fig. 7: Testing the IAC using battery voltage to see if the valve will close-2VZ-FE and 3VZ-FE engines 89554g51.gif

  5. Apply battery voltage to terminals B1 and B2 while repeatedly Grounding S4, S3, S2, S1, S4 in sequence. Check that valve moves toward the opened position. Fig. 8: Testing the IAC using battery voltage to open the valve - 2VZ-FE and 3VZ-FE engines 89554g52.gif

  6. If valve does not function as specified, replace the ISC valve.
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Oct 12, 2010 | 1995 Toyota Camry

2 Answers

Will a GM 60 degree V6 work in my '97 Rodeo LS V6 4wd


NO! Call a salvage yard, they have info. on what will fit it.

Jun 04, 2009 | 1995 Isuzu Rodeo

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