Code 45

Rich Exhaust

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Run warm engine (closed Loop) to 1200 rpm
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Does Scan Tool display fixed O2 above 750 mv?
Text Box: Run warm engine (closed Loop) to 1200 rpm Does Scan Tool display fixed O2 above 750 mv?

No
Text Box: No

Yes
Text Box: Yes

No
Text Box: No

Yes
Text Box: Yes
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Faulty ECM
Text Box: Faulty ECM
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Go to diagnostic tips below
Text Box: Go to diagnostic tips below
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Code 45 is intermittent. Go to diagnostic aids below.
Text Box: Code 45 is intermittent. Go to diagnostic aids below.
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Unplug the O2 sensor and jumper the purple wire to ground
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The Scan Tool should now read below 350 mv.  Does it?
Text Box: Unplug the O2 sensor and jumper the purple wire to ground The Scan Tool should now read below 350 mv.  Does it?