Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 655
7A1–120 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 55
BRAKE SWITCH SHORT TO GROUND OR OPEN
This DTC does NOT flash the CHECK TRANS
indicator and does NOT set the BACKUP MODE.
Circuit Description:
•
The brake switch is a switch on the brake pedal
that is used to provide the information: brakes
are applied. This is used by different features:
cruise control, stop light and Transmission
Control Module (TCM).
•
The TCM uses the information (brakes applied)
mainly to release the Torque Converter Clutch
(TCC).
•
The brake switch input is constantly connected to
battery when the pedal is pressed. TCM terminal
D9 is connected to Voltage.
•
The brake switch input is opened when the pedal
is released. TCM terminal D9 is grounded.
Diagnostic Aids:
•
This Diagnostic is not an electrical test done by
the TCM but a test between different information
(“logic test”).
•
Detection conditions:
1 Brake seen as applied during an acceleration
from less than 10 Km/h to more than 60 Km/h
within 6 seconds.
2 After this acceleration the vehicle speed was
higher than 60 Km/h during at least 6
seconds.
3 No Malfunction: Output Speed (DTC11).
Downshift Protection (DTC62).
4 The conditions need to be present for at least
5 times during an ignition cycle.
•
Action after the detection time: No action but, as
the brake is seen as applied, the TCC is never
applied.
•
Recovery conditions: To recover, brake has to be
released.
BRAKE SW
INPUT
TRANSMISSION
CONTROL
MODULE (TCM)
C-95
H-25
BLK
BLK
BLK
7
C1(1)
D1(17)
GROUND
D9(25)
RED
RED
GRN
C-44
2
C-44
1
FUSE EB-10(10A)
STOP LAMP SW
D07LW022