UEGO/Lambda Error | AEM
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chris24z
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Joined: 04/23/2018 - 14:18
UEGO/Lambda Error

I'm getting an UEGO/Lambda error from the infinity tuner. I have the AEM PnP harness connectors and LSU 4.2 O2 sensors. The infinity tuner is not getting the correct AFR readings; Lambda 1&2 are always at 14.7 to 14.8. The "UEGO Installed" boxes are checked at the wizard, engine is idling fine in open loop. What would cause the infinity tuner to output the UEGO/Lambda errors (other than issues with the PnP harness pin/wiring)?

AEM_SB
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Last seen: 2 months 3 weeks ago
Joined: 06/07/2014 - 14:29
When you have a Bosch LSU4.2
When you have a Bosch LSU4.2 sensor wired directly to the ECU, it's possible to log some additional data to help see if there is a problem with the O2 sensor wiring. Please add these channels to the layout so they will be included in the log.
 
UEGO_0_Diag_error      (this will be 0 or 1,   1 means the onboard UEGO controller chip is detecting an error)
UEGO_0_Heater_Duty    (heater duty cycle for the sensor, it helps us if you include this channel in the log)
UEGO_0_Ri_calc            (this will be above 500 when the sensor is cold, should stay between 40-80 when the sensor is warmed up. A cold sensor should warm up after about 20-60 seconds, depending on ambient temperature)
UEGO_0_Diag                (this will be a large number, it's a diagnostic value that can be decoded to help narrow down which error is present. Should indicate 59647 for a warm sensor with no errors detected. False errors will be indicated when the sensor is cold, don't worry about this too much)
 
 
Please attach a log showing those values, make sure the log is at least 60 seconds long so the sensor has time to warm up.
 
Hope that helps,
SB
chris24z
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Last seen: 2 years 2 months ago
Joined: 04/23/2018 - 14:18
I have the log session you

I have the log session you requested, but it looks like the sensors aren't warming up (UEGO_0_Ri_calc doesn't go below 500).

AEM_SB
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Last seen: 2 months 3 weeks ago
Joined: 06/07/2014 - 14:29
Check that the sensor is

Check that the sensor is receiving 12V power on pin 3 when the ignition key is on. Pin diagram for reference: http://aemelectronics.com/sites/default/files/forumpictures/Bosch%204.2%...

If the sensor is receiving 12V power, double-check that the wiring harness has continuity from pin 4 on the Bosch sensor to pin C1-4 on the Infiniy-708 ECU.

 

If all that checks out, double-check the other pins on the sensor have the correct connections to the Infinity-708 ECU:

Bosch pin 1 goes to Infinity pin C1-7  (UEGO UN)

Bosch pin 2 goes to Infinity pin C1-5 (UEGO IA)

Bosch pin 3 needs to receive 12V power from the harness, this should be a wire capable of carrying at least 5A current.

Bosch pin 4 goes to Infinity pin C1-4  (UEGO Heater switched ground), this should be a wire capable of carrying at least 5A current.

Bosch pin 5 goes to Infinity pin C1-8  (UEGO VM)

Bosch Pin 6 goes to Infinity pin C1-6  (UEGO IP)

 

If all that checks out, try swapping in a new sensor. It's AEM part number 30-2001.

Hope that helps,

SB

chris24z
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Last seen: 2 years 2 months ago
Joined: 04/23/2018 - 14:18
Problem fixed! Had some

Problem fixed! Had some issues with the wiring. Thanks.

AEM_SB
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Last seen: 2 months 3 weeks ago
Joined: 06/07/2014 - 14:29
Thanks for following up.

Thanks for following up.