Do you have a scan tool to be able to read what the ECM sees from the speed sensor?
That would be the way to tell if you have a vehicle speed sensor issue or a dash cluster issue.
The sensor sends a signal to the ECM and then the ECM sends that signal to the dash cluster.
The Programmable Speedometer/Odometer Module (PSOM) provides a vehicle speed signal input to:
- Powertrain Control Module (PCM)
- Speed Control Servo Amplifier
- Instrument Cluster
The speed signal is used by the PCM to determine transmission shift points and torque converter clutch operation.
The PSOM receives a vehicle speed signal from the Differential Speed Sensor (DSS) on pin 4 DSS input, and pin 5 DSS return. It converts this signal to a standard 8000 pulses-per-mile speed signal output. This output signal is sent to the PCM on pin 3 PSOM (+) and pin 6 PSOM (-).
The PSOM receives two power supply inputs. Pin 1 receives a continuous 12.0 volt input while pin 2 receives a 12.0 volt input only when the ignition switch is in run.
RELATED DIAGNOSTIC TROUBLE CODES
DTC 29/452 PCM detected an error in the PSOM output signal.
The Vehicle Speed Sensor (VSS) is located on the rear axle housing.
Tuesday, April 6th, 2021 AT 6:12 PM