2004 Kia Rio sudden engine rev up

Tiny
ZULANDERS
  • MEMBER
  • 2004 KIA RIO
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 134,572 MILES
The car has 1.6L engine. When test with engine diagnose device this is what came up in its error code:-

P1507 = MPS (motor position sensor) - abnormal
P1505 = kick down servo switch

the check engine always light up even after the error code has been erase.
during in idle, the engine timing suddenly increase from normal but after few second it drop down back to normal. This condition will occur a few times but not always. What should I do to resolve this problem? What should I check/investigate/test?
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Sunday, August 1st, 2010 AT 8:46 AM

3 Replies

Tiny
KHLOW2008
  • EXPERT
Hi zulanders,

When there is a fault in the control system, erasing the codes do not serve any purpose. You need to replace the faulty item or repair the wiring.

P1505 = Idle Air control valve opening coil signal low input.
P1507 = Idle Air control valve closing coil signal low input.

Possible causes:
Open or short to chassis ground between IACV and ECM
Faulty IACV


http://www.2carpros.com/forum/automotive_pictures/192750_P1505Rio04Fig224_1.jpg



http://www.2carpros.com/forum/automotive_pictures/192750_P1507Rio04Fig228_1.jpg

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Monday, August 2nd, 2010 AT 8:57 AM
Tiny
ZULANDERS
  • MEMBER
Would mind tell me the location of the IACV place in the car?
What is the IACV look like? If you can, direct me or post me the picture so that I could find it. Thank you.
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Tuesday, August 3rd, 2010 AT 1:23 AM
Tiny
KHLOW2008
  • EXPERT
The IACV, in the diagram it is called the ISC( Idle Solenoid Control), is located on the throttle body.


http://www.2carpros.com/forum/automotive_pictures/192750_EngComp04RioFig06_1.jpg



I am not able to find any diagrams to show you how the connector has 3 wires with the following colors:
1. White.
2. Red/Green.
3. Green.

It is an attachment that is mounted onto the throttle body with screws and can be disconnected.
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Tuesday, August 3rd, 2010 AT 6:28 AM

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