"Service Engine Soon" Light on!!
07-05-2011, 06:55 PM
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"Service Engine Soon" Light on!! Just wondering if anyone has any experience with this problem?
I have a "service engine soon" light on on my dash. The light will only come on after the engine is warm. The trouble code is #26 which is quad driver #1 of the ECM. Quad driver #1 controles the air pump relay, EGR solinoid, and the Evap. solinoid.
The light is off when I first start up in the morning and doesn't come on until I am almost to work, about 12-14 miles from home.
I have kind of gone through the basics, but Is there any known common problems with a 93 Z28 that I should look at?
Thanks
Dennis
I have a "service engine soon" light on on my dash. The light will only come on after the engine is warm. The trouble code is #26 which is quad driver #1 of the ECM. Quad driver #1 controles the air pump relay, EGR solinoid, and the Evap. solinoid.
The light is off when I first start up in the morning and doesn't come on until I am almost to work, about 12-14 miles from home.
I have kind of gone through the basics, but Is there any known common problems with a 93 Z28 that I should look at?
Thanks
Dennis
07-06-2011, 11:46 AM
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07-06-2011, 01:50 PM
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You can:
1) pull the fuse for the AIR system. If the SES light comes on immediately from a cold start you can likely rule out the AIR system. It only comes on and runs for the first few minutes to get the cat(s) up to operating temperature.
2) EVAP solenoid: you'd probably have a "purge solenoid circuit" code accompanying the quad driver code. Not likely, but possible.
3) EGR solenoid. My vote is a problem somewhere in EGR. A good overview of EGR operation can be found here: http://shbox.com/1/4th_gen_EGR.html. Since, as the article states, EGR mostly operates while cruising, it's probably the most likely of the three possibilities.
1) pull the fuse for the AIR system. If the SES light comes on immediately from a cold start you can likely rule out the AIR system. It only comes on and runs for the first few minutes to get the cat(s) up to operating temperature.
2) EVAP solenoid: you'd probably have a "purge solenoid circuit" code accompanying the quad driver code. Not likely, but possible.
3) EGR solenoid. My vote is a problem somewhere in EGR. A good overview of EGR operation can be found here: http://shbox.com/1/4th_gen_EGR.html. Since, as the article states, EGR mostly operates while cruising, it's probably the most likely of the three possibilities.
07-06-2011, 11:59 PM
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You can:
1) pull the fuse for the AIR system. If the SES light comes on immediately from a cold start you can likely rule out the AIR system. It only comes on and runs for the first few minutes to get the cat(s) up to operating temperature.
2) EVAP solenoid: you'd probably have a "purge solenoid circuit" code accompanying the quad driver code. Not likely, but possible.
3) EGR solenoid. My vote is a problem somewhere in EGR. A good overview of EGR operation can be found here: http://shbox.com/1/4th_gen_EGR.html. Since, as the article states, EGR mostly operates while cruising, it's probably the most likely of the three possibilities.
1) pull the fuse for the AIR system. If the SES light comes on immediately from a cold start you can likely rule out the AIR system. It only comes on and runs for the first few minutes to get the cat(s) up to operating temperature.
2) EVAP solenoid: you'd probably have a "purge solenoid circuit" code accompanying the quad driver code. Not likely, but possible.
3) EGR solenoid. My vote is a problem somewhere in EGR. A good overview of EGR operation can be found here: http://shbox.com/1/4th_gen_EGR.html. Since, as the article states, EGR mostly operates while cruising, it's probably the most likely of the three possibilities.
Thanks again Gojira!
Dennis
