01 bonneville se ses light wont leave - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-17-2010, 10:41 PM   #1
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Default 01 bonneville se ses light wont leave

hi all i have a 2001 bonne se im getting dtc code p1404 egr closed position performance checked the egr valve out and the pintle moves freely by hand and the pipes were clear so i figured the motor that moves the pintle might have just went bad so i got a new egr valve and still the same light is there something else that could cause this thanks so much for you help
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Old 02-18-2010, 08:22 AM   #2
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You prob need to be looking at a short to voltage, short to ground, or high resistance on one of the wires. The black is a low refrence ground, the gray is a 5 volt refrence i would start there!
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Old 03-03-2010, 07:53 PM   #3
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sorry took so long to get back i took the egr valve off and made sure the lines were clear and the pintle moved it did, so i put sealer and a gasket on to make sure it will not leak, then my buddy used his scanner to check out the computer and he can open and close the egr valve with it so im guessing that it has good power going to it.........i just want this light gone lol
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Old 03-03-2010, 07:58 PM   #4
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Start checking the wires for a short or open circuit.

EGR
Black Signal ground
Brown EGR pintle position signal
Gray EGR valve control
Pink EVAP system
Gray 5 volt reference
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Old 03-05-2010, 01:38 PM   #5
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Measure the voltage from the 5 volt reference circuit of the EGR position sensor to the ground circuit of the EGR position sensor.

Does the DMM display voltage near the specified value?

is it 5 volts
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Old 03-05-2010, 01:43 PM   #6
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Old 03-05-2010, 01:43 PM   #7
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do this before previous post

Turn OFF the ignition.
Disconnect the EGR valve.
Turn ON the ignition, with the engine OFF.
Use a scan tool in order to observe the EGR position sensor parameter.
Does the scan tool indicate that the EGR Position Sensor is at the specified value? 0%

perform test from previous post only if 0%

let me know results
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Old 03-05-2010, 04:53 PM   #8
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just ignore my previous posts Bill'* got it covered for ya.
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Old 03-22-2010, 08:19 PM   #9
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how do i check the plug for a short or the five volt reference what colors do i connect the ohm meter too and what values should i get thanks alot
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Old 03-22-2010, 08:29 PM   #10
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Quote:
Originally Posted by jfrompa2000 View Post
how do i check the plug for a short or the five volt reference what colors do i connect the ohm meter too and what values should i get thanks alot




The gray wire is the reference voltage. Connect the Red probe from your DDM to the reference voltage wire and the black to ground.
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