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1996 Toyota Pickup Code P0402

Tiny
DAVEFRMCA
  • MEMBER
  • 1996 TOYOTA PICKUP
  • 4 CYL
  • 2WD
  • MANUAL
  • 116,000 MILES
I have the P0402 code. I understand it's an EGR system problem. I tested the EGR valve, using vacuum to the valve and the engine dies. It works OK. I tested the VSV switch and it's operating. I assumed it would then be the vacuum modulator so I replaced it. The ligh came back on in about 25 miles.
Do you have any idea what the problem might be?
Thanks
Dave Van Buren
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Thursday, April 3rd, 2008 AT 1:56 PM

5 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Causes. EGR stuck open, EGR VSV, EGR VSV open circuit, EGR temerature sensor short circuit, or ECM, Or ECM power and ground circut propblems...
To check the temp sensor cicuit, you need a scan toll that can read the EGR gas temps, if the temp reads 318.7 Degrees F there is a short in the temp sensor cicuit.
This is on a warm engine of course... disconnect EGR temp sensor connector, If reading is 37.6 Degrees F replace the sensor... If it is not you need to test the wires between the sensor and the PCM, if they test OK replace the PCM!


https://www.2carpros.com/forum/automotive_pictures/62217_TestEGR_1.jpg


https://www.2carpros.com/forum/automotive_pictures/62217_TestEGRa_1.jpg



https://www.2carpros.com/forum/automotive_pictures/62217_TestEGRb_1.jpg



https://www.2carpros.com/forum/automotive_pictures/62217_VSV_1.jpg

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Thursday, April 3rd, 2008 AT 2:12 PM
Tiny
DAVEFRMCA
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Thanks for the info. I checked the ohms at the temp. Sensor. It's 136 cold and 94 hot. There is 5 volts at the terminal when engine off.
Does this sound like temp. Sensor?
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Thursday, April 3rd, 2008 AT 8:33 PM
Tiny
MERLIN2021
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  • 17,250 POSTS
You want to check the degrees if you can. With a scanner that reads sensor values. Reading Ohms I think the value should be 2500! So yes I would say the sensor is No good!
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Friday, April 4th, 2008 AT 12:29 PM
Tiny
DAVEFRMCA
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  • 3 POSTS
Thanks for the info so far. I found that I have a cracked exhaust manifold. Would that give me the P0420 code?
Thanks again
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Saturday, April 5th, 2008 AT 5:06 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Well I would fix that and reset the light first, but the resistance is still way off on the semsor. But who knows, you might luck out.
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Saturday, April 5th, 2008 AT 8:10 PM

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