Closed loop lambda control
Junior Member
Joined: Jul 2024
Posts: 22
Likes: 7
From: Luton, UK
Hi.
What are the conditions that S/C AJ16 engine goes to closed loop control ?
Mine isn't going to closed loop and lambda voltage on both banks is about 1.25 volts dropping down when throttle is opened but going back to over 1v.
My engine is running rich 13-13.5 AFR, when measured with wide band lambda
Engine has reached temperature above 89 degrees celsius.
Should there be evident lambda fluctuation going between 0V-1V ?
Also there are no codes.
Thank You in advance.
What are the conditions that S/C AJ16 engine goes to closed loop control ?
Mine isn't going to closed loop and lambda voltage on both banks is about 1.25 volts dropping down when throttle is opened but going back to over 1v.
My engine is running rich 13-13.5 AFR, when measured with wide band lambda
Engine has reached temperature above 89 degrees celsius.
Should there be evident lambda fluctuation going between 0V-1V ?
Also there are no codes.
Thank You in advance.
I have exactly the same symptoms with my '96 4.0 N/A XJS.
Veteran Member
Joined: Aug 2021
Posts: 4,683
Likes: 1,325
From: Kansas City
Suggest starting a new thread , there is more experience with the AJ16 engine in this X300 section
On your XJS there should be one fuse for all O2 sensors heating elements as the sensors have to be at their temp to operate , physics
The O2 sensors when operating should read in the range of 3.5 volts as these sensors are the different titania based sensors
The Lambia target value as the ECU calculates it ( not to be derive from O2 sensor meter direct readings ) is the same 1.0
See your AJ16 engine starting on page 51
jagrepair.com/images/Training Guides/801S - 2000.pdf
On your XJS there should be one fuse for all O2 sensors heating elements as the sensors have to be at their temp to operate , physics
The O2 sensors when operating should read in the range of 3.5 volts as these sensors are the different titania based sensors
The Lambia target value as the ECU calculates it ( not to be derive from O2 sensor meter direct readings ) is the same 1.0
See your AJ16 engine starting on page 51
jagrepair.com/images/Training Guides/801S - 2000.pdf
Last edited by Parker 7; Jul 30, 2024 at 09:04 PM.
Veteran Member
Joined: May 2010
Posts: 5,352
Likes: 1,750
From: Arlington, VA
Yes, start a new thread. Make sure you bring us up to speed on what's been done in the past. For instance, those oxygen sensors are almost 30 years old. Please share when they were last replaced.
Thread
Thread Starter
Forum
Replies
Last Post
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)