7A–5
AUTOMATIC TRANSMISSION (4L30–E)
Normal Operation Of 2002 4L30–E
Transmission
Torque Converter Clutch (Electronically
Controlled Capacity Clutch : ECCC)
Application Conditions:
The clutch apply is controlled by moving the converter
clutch control valve by commanding Torque Converter
Clutch (TCC) solenoid using the PWM signal.
The TCC is normally applied in 2nd, 3rd and 4th gears
only when all of the following conditions exist:
— The engine coolant temperature is above 70
°
C
(158
°
F) and ATF temperature is above 18
°
C
(64.5
°
F).
— The shift pattern requests TCC apply.
Moreover, TCC is always applied in 2nd, 3rd and 4th
gears when the transmission oil temperature is above
135
°
C (275
°
F).
This mode should be canceled at 125
°
C (257
°
F).
ATF Warning Lamp
The ATF warning lamp will be constantly on (not flashing)
if the transmission oil temperature is above 145
°
C
(293
°
F).
The ATF warning lamp goes off again when the
transmission oil temperature is below 125
°
C (257
°
F).
Reverse Lock Out
With the selector lever in reverse position, the PCM will
not close the PWM solenoid until the vehicle is below 11
km/h (6.8 mph), thus preventing reverse engagement
above this speed.
Diagnosis
Introduction
The systematic troubleshooting information covered by
this Section offers a practical and systematic approach to
diagnosing 4L30–E transmission, using information that
can be obtained from road tests, electrical diagnosis, oil
pressure checks or noise evaluation.
The key to correcting a complaint is to make use of all of
the available symptoms and logically letting them direct
you to the cause.
When dealing with automatic transmission complaints, it
is best to gather as many symptoms as possible before
making the decision to remove the transmission from the
vehicle.
Frequently, the correction of the complaint does not
require removal of the transmission from the vehicle.
Driver Information
To analyze the problem fill out a complete description of
the owner’s complaint.
Please draw a circle around the right information and
complete the following form. (The next page is an
example of a completed form). You can draw a circle
around many numbers if you are not sure.