2 wire VSS to 3 wire VSS conversion questions/help
Posted: Fri Mar 31, 2023 11:04 pm
I'm looking for some guidance in swapping my VSS from a 2 wire sensor to a 3 wire sensor.
The car is a 1998 impreza L originally equipped with a 2 wire VSS. The speedometer isn't working and I've narrowed it down to an issue likely with the motor that moves the needle in the cluster.
I couldn't find any info on fixing the cluster, I've read that the 1998 year was problematic with this. This has prompted me to swap the cluster with a newer style(MY99-01) that utilized the 3 wire VSS and a change in the style of connectors.
The cluster swap is easy and moving the wires around to there correct location is not a problem.
I'm struggling to understand the wiring for the VSS. From what I've read it's apparent that the signal is output differently between the two different VSS sensors. The car is an automatic transmission so the TCU will need to see a signal in addition to the cluster and ECU.
My question is, will the TCU interpret the signal correctly with the different sensor? What is my approach for wiring this in?
When I dig into the FSM, assuming it's accurate for the 1998 impreza L , it appears the signal leaves the sensor and goes to the TCU, then leaves the TCU and splits to the cluster and ECU.
Is at as simple as using the the original signal wire and moving into the 3 wire VSS signal pin? The other two pins on the VSS are for ground and switched power.
I could intirely be over thinking this all as I do that alot. I've seen a few other forum threads but none that specifically mention using an automatic transmission.
Sorry and thanks in advance. I know this isn't legacy specific but the knowledge base here is strong.
The car is a 1998 impreza L originally equipped with a 2 wire VSS. The speedometer isn't working and I've narrowed it down to an issue likely with the motor that moves the needle in the cluster.
I couldn't find any info on fixing the cluster, I've read that the 1998 year was problematic with this. This has prompted me to swap the cluster with a newer style(MY99-01) that utilized the 3 wire VSS and a change in the style of connectors.
The cluster swap is easy and moving the wires around to there correct location is not a problem.
I'm struggling to understand the wiring for the VSS. From what I've read it's apparent that the signal is output differently between the two different VSS sensors. The car is an automatic transmission so the TCU will need to see a signal in addition to the cluster and ECU.
My question is, will the TCU interpret the signal correctly with the different sensor? What is my approach for wiring this in?
When I dig into the FSM, assuming it's accurate for the 1998 impreza L , it appears the signal leaves the sensor and goes to the TCU, then leaves the TCU and splits to the cluster and ECU.
Is at as simple as using the the original signal wire and moving into the 3 wire VSS signal pin? The other two pins on the VSS are for ground and switched power.
I could intirely be over thinking this all as I do that alot. I've seen a few other forum threads but none that specifically mention using an automatic transmission.
Sorry and thanks in advance. I know this isn't legacy specific but the knowledge base here is strong.