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
AUTOMATIC TRANSMISSION (4L30-E) 7A1–121
DIAGNOSTIC TROUBLE CODE (DTC) 55
BRAKE SWITCH SHORT TO GROUND OR OPEN
•
Install scan tool GOTHROUGH TECH2 CONNECTION.
•
Ignition switch ON. Engine ON.
•
Select F0: DATA LIST: “BRAKE SWITCH”.
•
Apply brake.
IF: Display is “NOT ACTIVE”:
YES
NO
•
Check the short circuit
to ground or open.
•
Repair.
The problem is
intermittent.
GOTO INTERMITTENT
CONDITIONS.
7A1–122 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 56
BRAKE SWITCH SHORT TO PLUS
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 released during a deceleration
from more than 60 Km/h to less than 10 Km/h
within 6 seconds.
2 Before this deceleration the car 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 released, the TCC is applied
even when the brake is 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
AUTOMATIC TRANSMISSION (4L30-E) 7A1–123
•
Install scan tool GOTHROUGH TECH2 CONNECTION.
•
Ignition switch ON. Engine ON.
•
Select F0: DATA LIST: “BRAKE SWITCH”.
•
Do not touch brake.
IF: Display is “NOT ACTIVE”:
YES
DIAGNOSTIC TROUBLE CODE (DTC) 56
BRAKE SWITCH SHORT TO PLUS
NO
The problem is
intermittent.
GOTO INTERMITTENT
CONDITIONS.
•
Check the short circuit
to voltage.
•
Repair.
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