Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Service manual - part 654
7A1–116 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 53
MODE SWITCH IN P OR N OR R BAD POSITION
This DTC does NOT flash the CHECK TRANS
indicator and does NOT set the BACKUP MODE.
Circuit Description:
•
The mode switch supplies the Transmission
Control Module (TCM) with information regard-
ing the selector lever position: P, R, N, D, 3, 2 or
L. The selector lever position is indicated by the
state of four ON/OFF contacts. The mode switch
is located on one side of the transmission. It is on
the transmission manual shaft and is fixed to the
main case.
•
The mode switch is also used to provide the
information P or N to the engine crank wiring.
The engine can be cranked only if connector M-25
terminal 4(H) is connected to terminal 1(E), which
is connected to ground.
•
The mode switch is also used to provide the back
up lamp power in reverse. This is the reason why
the mode switch is supplied through a 15A fuse
(CB-11). This fuse can burn due to short circuit in
the back up lamp.
•
When this fuse is open, the mode switch does
not work and DTC54 is set.
•
The mode position is defined by the shift linkage
which is a link between the shift lever and the
mode switch. A bad adjustment of the shift link-
age can create a mode switch problem (DTC53).
Diagnostic Aids:
•
This Diagnostic is not an electrical test done by
the TCM but a test between different information
(“logic test”).
•
Detection conditions of P or N bad position:
1 A/T Input Speed <3000 RPM
2 TPS > 20%
3 Mode Switch = P or N
4 No malfunction: TPS short to voltage or
ground (DTC 21, DTC22), Engine Speed
(DTC13).
5 The conditions need to be present for at least
4 seconds.
•
Action after the detection time: Default position
assumed for pressure calculation and shift
pattern = always in D.
•
Recovery Conditions: To recover, have the engine
speed higher than 3000 RPM with a TPS higher
than 20% when the mode switch is not in P or N.
•
Detection conditions of R bad position:
1 A/T Output Speed > 3200 RPM (approx. 100 KPH)
2 Mode Switch = R
3 No malfunction: Output speed (DTC11).
Downshift Protection (DTC62).
4 The conditions need to be present for at least
4 seconds.
•
Action after the detection time: Default position
assumed for pressure calculation and shift
pattern = always in D.
•
Recovery conditions: To recover, have the output
speed higher than 3200 RPM when the mode
switch is not R.
AUTOMATIC
TRANSMISSION
MODE
SWITCH
PIN C
CB-11
15A
7(B)
2(F)
6(C)
FUSE BOX
TRANSMISSION CONTROL INPUTS
M-25
5(D)
TRANSMISSION
CONTROL
MODULE (TCM)
3(G)
4
1
2
3
8(A)
M-25
C-95
1
2
D
3
N
R
P
1
2
D
3
N
R
P
1
2
D
3
N
R
P
1
2
D
3
N
R
P
PIN B
PIN A
PIN G
WHT
BLU/WHT
BLU/RED
BLU
BLU/BLK
BLU/WHT
RED/YEL
BLU/RED
BLU
BLU/BLK
H-23
D5(21)
D6(22)
D7(23)
D4(20)
PIN F
BACK UP
LAMP
PIN E
1(E)
4(H)
M-25
BRN/YEL
STARTER RELAY
BLK
D07LW021