Troubleshooting DTC 452.

[GT3000]

Hey all, I recently came across DTC 452 on a read of my EEC IV, I know the sensor itself is good but unsure how to troubleshoot it to find the root of the problem and fix it. It's causing my O/D light to flash and this won't do.

 

[GT3000]

Anyone have a solution?

 

[jremington59]

DTC 452 indicates the PCM detected an error in the Programmable Speedometer/Odometer Module (PSOM) output signal during the last 40 warm-up cycles.

Possible Causes:

-- Damaged Rear Anti-Lock Brake System (RABS).

-- Damaged PSOM.

-- Damaged harness circuits.

-- Damaged PCM.

 

[GT3000]

I see. Which would be the easiest to start with ramping up to the most difficult and are these tasks a DIYer can even tackle?

 

[jremington59]

You need a meter and the test procedure for testing voltages. Probably not something a novice would have an easy time with. There are directions online for testing the PSOM. I have no idea the cost of another PSOM.

 

[GT3000]

So differing to a specialist is probably best?

 

[jremington59]

Either that or you can try throwing another PSOM in it. I'd probably opt for getting a professional opinion.

 

[GT3000]

I see. What's the cost on getting a problem like this fixed?