A/T, Instruments - A4CF2 A/T Speedometer Diagnostics

Model Spectra[LD]

Group Automatic Transaxle(52)

Number KT2006092101

Date Monday, September 25, 2006

Area N.America

Subject
2006 Spectra A4CF2 Automatic Transaxle Speedometer Diagnosis

- Description

The new 2006 Fed. spec. and all 2007 Spectra automatic transaxle vehicles are equipped with a new A4CF2 transaxle. This transaxle does not have a VSS. The instrument cluster receives the vehicle speed signal from the TCM. The TCM receives the primary vehicle speed signal from the Output Speed Sensor, the back-up signal is the Input Speed Sensor. Finally the ECM receives a vehicle speed signal from the RH wheel speed sensor that is used if there is no signal from the TCM. To diagnose a speedometer problem do the following:

1. Check for vehicle speed data from the ECM / TCM with the scan tool or GDS. If the signal exists there is a poor connection between the TCM and the instrument cluster.

2. Check the circuit from TCM pin 53 through JC01 pin 16 to JC03 pin 25 to connector MF02 pin 15 to M24 / M25 pins 14 and 12 to instrument cluster M08-2 pin 5. There have been some reports of poor pin tension at the engine room junction box connectors JC01 and JC03.

3. In a few cases there is a pulsed signal from the transaxle Output Speed Sensor to the TCM but no output from the TCM on pin 53. If you're sure the signal goes into the TCM and does not come out, a new TCM is required.