Mazda Training manual - part 34

Powertrain Transmissions 

 

• 

The three shaft design with one input shaft and two output shafts allows for a more 
compact construction, since each output shaft only carries three or four gears. 

• 

As a result of this construction there are two different final gear ratios available, i.e. one 
for the first to fourth gear and another one for the fifth, sixth and reverse gear. 

 

L1001.4_02003 

 

1 

Differential 

3 

Output shaft no. 2 

2 

Output shaft no. 1 

4 

Input shaft 

 
 
 

Curriculum Training 

02-7 

Transmissions Powertrain 

S15M(X)-D Transmission 

• 

The S15M(X)-D is a three-shaft (coaxial arranged) five-speed MT, which is directly 
operated by the shift lever.  

• 

The S15M-D transmission is fitted in the RWD version of the Mazda BT-50, while the 
S15MX-D transmission with bolted-on transfer case is fitted in the 4WD version.  

 

NOTE:  When replacing or refilling the transmission oil and/or the separate transfer oil only 

use the specified MTF (Manual Transmission Fluid) “Type A” (refer to the workshop 
manual for details). 

 

Overview 

 

L1001.4_02006 

 

1 

Output shaft 

4 

Counter shaft 

2 

Extension housing (S15M-D) 

5 

Input shaft 

3 

Transfer case (S15MX-D) 

 

 

 
 

02-8 Curriculum 

Training 

Powertrain Transmissions 

 

Automated Shift Manual Transmission 

• 

The automated shift manual transmission is based on the two-shaft five-speed MTX iB5. 
Compared to the cable operated version of the iB5 transmission the automated shift 
manual transmission features a bolted-on shift actuator, and a separate clutch actuator 
with integrated TCM (Transmission Control Module). Depending on the signals from the 
TCM the clutch actuator operates the clutch via the clutch slave cylinder, and the shift 
actuator performs the gearshifts accordingly. 

• 

The automated shift manual transmission is only fitted in the Mazda2 (DY) models with 
1.4 MZI engine. 

 

Overview 

 

L1001.4_02011 

 

1 

Clutch actuator with integrated TCM 

3 

Clutch slave cylinder 

2 Shift 

actuator 

  

 
 

Curriculum Training 

02-9 

Transmissions Powertrain 

Service Procedures 

Bleeding the Clutch System  

• 

The hydraulic fluid of the clutch system should be replaced every two years, together 
with the hydraulic fluid of the brake system. Since the clutch system can only be bled in 
a certain position of the clutch master cylinder, the clutch actuator first needs to be 
driven to this position with the aid of M-MDS. To perform the procedure select the option 
Toolbox

Æ PowertrainÆASM Service FunctionsÆShift Actuator Bleed and follow 

the instructions of M-MDS. 

02-10 Curriculum 

Training