Transmission
Fleet Owner
Joined: Oct 2005
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From: Kentucky
If you purchase an Equus 3145 you will be able to check for codes. The codes will tell you what the computer thinks is wrong. Sometimes the codes point you to exactly what is wrong. Other times it is showing a symptom of what is wrong.
Fleet Owner
Joined: Oct 2005
Posts: 20,785
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From: Kentucky
Some code readers interpret the "separator" flash as 10, that's normal.
What test do you try running? You should start out with the Key On Engine Off (KOEO) tests and Continuous Memory (CM) display. Any faults/codes will be displayed twice for each set of tests/display.
A System Pass (KOEO) will be 111 pause 111. Then there will be a separator flash (the "10" on your reader) then any codes from CM will be displayed twice. If there are no stored codes then once again you will see 111 pause 111.
What test do you try running? You should start out with the Key On Engine Off (KOEO) tests and Continuous Memory (CM) display. Any faults/codes will be displayed twice for each set of tests/display.
A System Pass (KOEO) will be 111 pause 111. Then there will be a separator flash (the "10" on your reader) then any codes from CM will be displayed twice. If there are no stored codes then once again you will see 111 pause 111.
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Fleet Owner
Joined: Oct 2005
Posts: 20,785
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From: Kentucky
I asked in Post#22 what the "vss code" was, by number. I also stated before the code reader will point you in the area of what the PCM thinks is wrong.
Fleet Owner
Joined: Oct 2005
Posts: 20,785
Likes: 1,751
From: Kentucky
Code 452: Computer detected an error in the VSS or PSOM signal during the last 80 warm-up cycles.
Since you already tried a new VSS you need to verify the VSS signal. Some good info here from Steve83: 1983 Ford Bronco PSOM picture | SuperMotors.net
Follow the directions at the bottom of that link. Use a DVM to verify the VSS signal output. Your truck should have a test port under the hood to snag the VSS signal:
courtesy of subford
If it is low then disconnect the RABS control module located behind the passenger side glove box.
This module receives the VSS signal before it continues onto the PSOM behind the speed/odometer. It is known to drag the signal down.
If the VSS signal is good at the RABS test connecor then you need to measure it again on the PSOM itself, which is denoted in the diagram on Steve's page. If the input is good at the PSOM then you may have a faulty connection on the PSOM or a PSOM that is going bad. These PCBs also suffer from aged leaking capacitors like the PCM does.
Since you already tried a new VSS you need to verify the VSS signal. Some good info here from Steve83: 1983 Ford Bronco PSOM picture | SuperMotors.net
Follow the directions at the bottom of that link. Use a DVM to verify the VSS signal output. Your truck should have a test port under the hood to snag the VSS signal:
courtesy of subford
If it is low then disconnect the RABS control module located behind the passenger side glove box.
This module receives the VSS signal before it continues onto the PSOM behind the speed/odometer. It is known to drag the signal down.
If the VSS signal is good at the RABS test connecor then you need to measure it again on the PSOM itself, which is denoted in the diagram on Steve's page. If the input is good at the PSOM then you may have a faulty connection on the PSOM or a PSOM that is going bad. These PCBs also suffer from aged leaking capacitors like the PCM does.
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