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Hammer Time
Hammer Time, L1 Master Technician
Category: Car
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Experience:  ASE Mastertech with Adv level Engine performance cert.
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2000 mazda protege lx 1.6 cel came on read code egr ...

Resolved Question:

2000 mazda protege lx 1.6 cel came on read code egr valve replaced egr light off week later cel light on again took it back read same code this time said it was the egr hose light off. again 1 week later cel on again took it back same code poped up this time they were all out of answers told maybe cars computer need to be rebooted or replaced. before i spend and arm and a leg on doing that is there anything else i should be looking at any help on this would be great thanks
Submitted: 8 years ago.
Category: Car
Expert:  Hammer Time replied 8 years ago.

You need a different mechanic. Engine computers do not "reboot". The codes don't tell you what to change. They tell you about a situation and you have to diagnose what caused it. It appears they just don't know what they are doing.


Expert:  Dan replied 8 years ago.
info only is it a p0402 code?
Customer: replied 8 years ago.
Reply to Dan's Post: yes p0402 is what it keeps reading
Customer: replied 8 years ago.
Reply to Hammer Time's Post: i think i got that much but do you have any ideas of what could be causeing this problem if the egr valve and hoses were replaced
Expert:  Hammer Time replied 8 years ago.

Here's a TSB on that code.


Bulletin No: 01-007/02


Last Issued: 2/25/2002


Subject:
MIL ILLUMINATES WITH DTC P0402 STORED IN MEMORY



BULLETIN NOTE This bulletin supersedes 01-012/01 issued 6/28/2001. The SRT (Suggested Repair Times) have been revised.



APPLICABLE MODEL(S)/VINs
All 1999-2001 Protege (1.6L)
All 1999-2000 Miata



DESCRIPTION


The Malfunction Indicator Lamp (MIL) may illuminate with Diagnostic Trouble Code (DTC) P0402 stored in memory. This may be caused by carbon deposits accumulating at the Exhaust Gas Recirculation (EGR) exhaust outlet port, inside the intake manifold. This may cause pressure to increase inside the exhaust gas flow circuit, resulting in stored DTC P0402.


Customers having this concern should have their vehicle repaired using the following procedure.


REPAIR PROCEDURE


Verify customer concern.

Confirm Freeze Frame Data was set for DTC P0402.

Remove Throttle Body according to Workshop Manual section 01-13.

Remove EGR valve (for Protege), or Surge tank (for Miata) according to the applicable Workshop Manual.

5. <>Using appropriate tool, remove carbon from EGR outlet port.

Caution: On Protege, DO NOT allow scraped-off carbon to fall into surge tank. Only allow carbon to exit through EGR port.




With compressed air, blow loosened carbon through EGR inlet port.

Warning: Wear eye protection (safety goggles) when removing carbon with compressed air.



Reassemble components in reverse order.


Verify repair.






WARRANTY INFORMATION


Note: This information applies to verified customer complaints on vehicles covered under normal warranty. Refer to the SRT microfiche for warranty term information.




Hammer Time, L1 Master Technician
Category: Car
Satisfied Customers: 4942
Experience: ASE Mastertech with Adv level Engine performance cert.
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