Quote:
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Originally Posted by Mark M
Just tested again to make sure. With engine running and wire inserted into plug, I get a reference voltage of .49 dc. When I ran operational driving tests months ago, the results fell in the range of .25 vdc and .98 vdc.
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This is normal operation......
Quote:
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Originally Posted by Mark M
Per the MB Service manual, I remember that I simulated a "lean" condition by grounding the signal wire leading to the ECU. The O2 sensor then performed like it should by reading the max .98 vdc. Based on the above, I concluded that the O2 sensor is performing as designed.
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Normal operation again.......
Quote:
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Originally Posted by Mark M
OVP relay is probably original (I purchased the car at 37k mi and I am now at 120k). Can I test if voltage to pin 1 is functioning with the ECU unplugged?
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You can back probe pin #1 in the ecu plug by first dismantling the black plastic cap and refit female register back in ecu, or you can cut back the loom sleeve and find the correct wire...
Quote:
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Originally Posted by Mark M
Why do you mention the coolant temp sensor? Would this factor into the fault code?
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If coolant temperature is reported as
below 15c, ecu will not allow the O2 to start operating....this is warm up cycle when engine exhaust will not be warm enough to operate the O2.
To test OVPR, pull plug from CIS-e ecu and measure voltage on pin #1 with
ignition on.
Yes? Fuse okay.
No ? Fuse bad...check 10amp fuse.
Pull off OVPR from it's plug...Bridge socket #1 to socket #2...12volts ?
( Pin #2 of OVPR socket is Batt+ supply voltage to ecu pin#1 )
Test pin#1 ecu for 12 vdc..... confirms continuity of Batt+ to ecu from OVPR.
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