IDENTIFICATION
The CD4E automatic transmission is identified by identification tag located on rear of transaxle and bottom of main control cover assembly. (Scheme 24)- (Scheme 25).
Scheme 24
Scheme 25
Note. For CD4E transaxle electronic testing and repair, see the AUTO TRANS DIAGNOSIS - CD4E article.
DESCRIPTION & OPERATION
The CD4E is a 4-speed transaxle assembly. The CD4E is controlled by both electronic and mechanical systems utilizing a compound planetary gearset, chain drive, final drive planetary gearset and an open differential. One band, 5 friction clutches, and 2 one-way clutches provide 4 forward gear ratios and reverse. (Scheme 26)
Input signals from sensors are sent to the Powertrain Control Module (PCM). The PCM can determine when the time and conditions are right for a shift or converter clutch application. The PCM can also determine line pressure needed to optimize shift feel.
Five electronic solenoids accomplish the following functions
- 2 On/Off solenoids for shifting.
- One Pulse-Width Modulator (PWM) solenoid for Torque Converter Clutch (TCC) control.
- One Electronic Pressure Control (EPC) solenoid for line pressure control.
- One 3-2 timing/coast clutch solenoid to control release of coast clutch, coordinated release of the direct clutch, and apply of the low and intermediate band.
PCM has built-in self-diagnosis, fail-safe code and warning code display for the main input sensors and solenoid valves.
Scheme 26
Stiff Shift Lever Operation
Check shift interlock system, shift linkage and manual valve (valve body).