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question on IPS!!

LTUDSM

Proven Member
1,802
5
Jun 27, 2005
Morrisville, Pennsylvania
Heyy guys,how do i test IPS??? Because i think its bad (not working).I tried unplug the ISC and idle changed,was kinda surging.I plug it back and it was ok.Then i unplugged IPS ,the idle didn't changed.I thought my throttle cable was to tight,I loosen it up,but still the same thing.
Where does the IPS wire comes from to the sensor??? Straight from ECU???
 

steve

DSM Wiseman
14,869
1,722
Feb 3, 2002
Boulder, Colorado
The green IPS wire goes to the ECU.
Unplugged from the switch there should be 5v to 12v on the wire with the ECU turned on.

The IPS should have continuity to ground with the throttle closed and open when the throttle opens slightly. Many people are missing the ground strap for the throttle body so that while the IPS works it doesn't actually ground the signal from the ECU.

On a 90 TB
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On a 91 TB
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The final test, with the wire connected to the IPS and the ECU powered up you should see the voltage at the connector (and ECU pin) go from 0v when the throttle is closed to 5v - 12v when the throttle is open.

This ground strap connects the TB to the intake manifold which is then connected to chassis ground by a braided wire strap between one of the bolts holding the throttle cable to the intake manifold and the firewall behind it.

On a 2G the IPS is inside the TPS and uses the TPS ground on the connector.
 
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