HOW TO TEST: WOT (wide open throttle) Switch

**Big-n-Broke-YJ** · 01-29-2007, 10:29 PM

testing procedute for 89 2.5 Liter

1. The ignition switch should be in the OFF position. Disconnect the electrical connector from the wiring harness, and test the on-off operation of the switch with a high impedance digital volt-ohm meter (DVOM). Test the switch several times by manually operating the throttle lever. When the throttle lever is rotated to full throttle position, a low resistance should be indicated on the DVOM. When the throttle lever is returned to idle, the DVOM should indicate an infinite resistance value. Replace the WOT if resistances are not correct.

2. Connect the WOT electrical connector to the wiring harness connector. Turn the ignition switch ON (engine not running), and connect a voltmeter across diagnostic connector 2 (D2) pins 6 and 7 (ground). There should be 0 volts when the throttle lever is in the WOT position. There should be 2 or more volts when the throttle lever is at any position except WOT.

3. If there are no voltage readings in any throttle lever positions, check for a short to ground in the wire harness or switch. Repair wiring harness as needed.

4. If there are no voltage readings and no shorts to ground, check for an open circuit in the wiring harness by connecting an ohmmeter across ECU electrical connector terminal 8 and the WOT switch connector. If the ohmmeter indicates continuity, then the harness is OK. If the ohmmeter indicates infinity, then there is an open in the wiring harness that needs to be repaired.

5. If the voltage reading from step 2 is always greater than 2 volts, no matter what the throttle lever position, then there is an open circuit between the WOT switch and ground. Repair wiring harness as necessary.

95YJDAVE · 01-29-2007, 11:06 PM

what does the wot switch do

**Big-n-Broke-YJ** · 01-29-2007, 11:15 PM

Quote:

This switch is located on the front side of the throttle body and is mounted to the throttle bracket with the Idle Speed Actuator (ISA) Motor. The purpose of this switch is to indicate a wide open throttle condition to the ECU via a voltage signal. This switch is a mechanically operated electrical switch. The switch contacts are normally open, and are activated closed by a wide open throttle condition. A wide open throttle condition exists when the throttle lever is rotated far enough to close the contacts of the wide open throttle switch. The ECU compensates for the wide open throttle condition by increasing the fuel injector pulse width which richens the air/fuel mixture.

i sent this ina pm to a fellow member in an attempt to help his rich a/f issue.... figured it would be a good thing to post up for everyone to see and make it easy for future people who actually take the time to search

95YJDAVE · 01-29-2007, 11:22 PM

ok thank you i was just curious

**Big-n-Broke-YJ** · 01-29-2007, 11:22 PM

i was too for the first 2 years i owned my jeep, hehe

01-29-2007, 11:06 PM	#2
95YJDAVE Registered User Join Date: Nov 2006 Location: New York Posts: 61 Profile Gallery Classifieds My Jeeps	what does the wot switch do __________________ just bought a 95 red yj soft top no mods yet [SIZE="3"][COLOR="Red"]/l , [____], l---L-- [COLOR="white"][][/COLOR]lllllll[COLOR="White"][][/COLOR]-[/COLOR] ()_) ()_)---o-)_)[/SIZE]

01-29-2007, 11:22 PM	#4
95YJDAVE Registered User Join Date: Nov 2006 Location: New York Posts: 61 Profile Gallery Classifieds My Jeeps	ok thank you i was just curious __________________ just bought a 95 red yj soft top no mods yet [SIZE="3"][COLOR="Red"]/l , [____], l---L-- [COLOR="white"][][/COLOR]lllllll[COLOR="White"][][/COLOR]-[/COLOR] ()_) ()_)---o-)_)[/SIZE]