Testing the downshift solenoid (Mazda Capella GC)

A faulty downshift solenoid is indicated by the transmission not shifting down when the accelerator pedal is fully depressed, or by erratic or rough gear shifting.

Raise the front of the vehicle and support it securely on stands. Drain approximately 1 liter of transmission fluid from the gearbox.

Follow the wire route to the connector located near the battery and disconnect it.

Using large pliers, unscrew the switch and cover the hole with a rag.

Keep your finger on the solenoid plunger, secure the solenoid body to the negative battery terminal, and apply voltage to the switch contact from the positive battery terminal to ensure the solenoid plunger retracts.

Replace the solenoid if there is any doubt about its condition.

Apply sealant to the solenoid threads before installation.

After installation, check the working fluid level and top it up if necessary.