Isuzu KB P190. Manual — part 1096
7A2-100 TRANSMISSION CONTROL SYSTEM (JR405E)
D1
Faulty
gearshift schedule (different from shift
speed chart)
D2
G
earshift frequently
D3
G
earshift point is low
or high at all points
D4
G
earshift point is low
or high at limited area
D5
N
o
kick-
dow
n
E1
N
o
gearshift
E2
O
nly
4th gear is not selectable
E3
G
ear is changed from 2nd to 3rd in 2 range
E4
G
ear is changed from 1st to 2nd in L range
E5
G
ear is changed from 3rd to 4th in 3 range
F1
Low
max
imum speed or poor acceleration
F2
O
nly
4th gear is not selectable
F3
N
o
ise or v
ibration occurs during in R
, D
, 3, 2
or L range
F4
Engine brake does not apply
in L range
F5
Engine stalls before v
ehicle stops from
running
G1
Vehicle mov
es in P range or parking is not
disengaged in other than P range
G2
Large creeping force
G3
Small creeping force
G4
Large noise during idle w
ith v
ehicle stop
H1
Judder O
ccurs at Lock U
p
H2
Large Shock at Lock U
p
H3
Lock U
p Point is H
igh or Low
I1
No
L
o
c
k
Up
Error, open or short circuit
Error, open or short circuit
Error, open or short circuit
Error, open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Error, open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Out of standard value
Faulty operation
Faulty operation
Faulty operation
Faulty operation
Faulty operation
Faulty operation
Faulty operation
Clogged passage
Clogged passage
Clogged passage
Clogged passage
Clogged passage
Clogged passage
Clogged passage
Slip
Seizure
Faulty operation
Separation
Faulty operation
Engine speed signal
Accelerator pedal position signal
Input shaft speed sensor
Output shaft speed sensor
Powe
r drive or 3rd start switch
Transmission range switch
TCM pow
er or ground
Transmission fluid temperature sensor
Pressure control solenoid
Torque converter clutch solenoid
Low & reverse brake solenoid
2-4 brake solenoid
High clutch solenoid
Low clutch solenoid
Ground return circuit
Low & reverse brake fluid pressure sw
itch
2-4 brake fluid pressure switch
High clutch fluid pressure sw
itch
Transmission fluid quantity
Control spool valve
High clutch solenoid accumulator
Low clutch solenoid accumulator
Low & reverse brake solenoid accumulator
2-4 brake solenoid accumulator
High clutch accumulator
2-4 brake accumulator
Pressure control solenoid hydraulic circuit
Torque converter clutch hydraulic circuit
High clutch solenoid hydraulic circuit
Low clutch solenoid hydraulic circuit
Low & reverse brake solenoid hydraulic circuit
2-4 brake solenoid hydraulic circuit
Oil cooler
Torque converter
D
iagnostic category
Pos
s
ible c
aus
es
Electrical
Disordered selector lever cable
Disordered transmission range sw
itch
Faulty line pressure
Faulty engine idle speed
Clutch
(brake
)
Torque converter clutch piston
H
y
draulic control
Pow
e
rtrain
TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-101
J1
T
ransmission fluid leaks from breather
J2
T
ransmission fluid leaks betw
een engine
and conv
erter housing
J3
T
ransmission fluid leaks betw
een conv
erter
housing and transmission case
J4
T
ransmission fluid leaks betw
een
transmission case and ex
tension housing
J5
T
ransmission fluid leaks from oil pan
J6
T
ransmission fluid leaks from manual shaft
oil seal
J7
T
ransmission fluid leaks from oil cooler pipe
joint
Z1
T
ransmission ov
erheat
Z2
M
ode lamp (pow
er driv
e or 3rd start) does
not turn O
n
Z3
M
ode lamp (pow
er driv
e or 3rd start) does
not turn O
ff
Z4
A/T
oil temperature lamp turns O
n
Z5
Selector lev
e
r feeling is faulty
Z6
Poor fuel consumption
Z7
Shift indic
a
tor is
faulty
Z8
Abnormal smell
Z9
T
ransmission fluid quantity
is low
or high
Z10
T
ransmission fluid quantity
is low
or high
Z11
Abnormal transmission fluid pressure
Error, open or short circuit
Error, open or short circuit
Error, open or short circuit
Error, open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Error, open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Open or short circuit
Out of standard value
Faulty operation
Faulty operation
Faulty operation
Faulty operation
Faulty operation
Faulty operation
Faulty operation
Clogged passage
Clogged passage
Clogged passage
Clogged passage
Clogged passage
Clogged passage
Clogged passage
Slip
Seizure
Faulty operation
Separation
Faulty operation
Engine speed signal
Accelerator pedal position signal
Input shaft speed sensor
Output shaft speed sensor
Powe
r drive or 3rd start switch
Transmission range switch
TCM pow
er or ground
Transmission fluid temperature sensor
Pressure control solenoid
Torque converter clutch solenoid
Low & reverse brake solenoid
2-4 brake solenoid
High clutch solenoid
Low clutch solenoid
Ground return circuit
Low & reverse brake fluid pressure sw
itch
2-4 brake fluid pressure switch
High clutch fluid pressure sw
itch
Transmission fluid quantity
Control spool valve
High clutch solenoid accumulator
Low clutch solenoid accumulator
Low & reverse brake solenoid accumulator
2-4 brake solenoid accumulator
High clutch accumulator
2-4 brake accumulator
Pressure control solenoid hydraulic circuit
Torque converter clutch hydraulic circuit
High clutch solenoid hydraulic circuit
Low clutch solenoid hydraulic circuit
Low & reverse brake solenoid hydraulic circuit
2-4 brake solenoid hydraulic circuit
Oil cooler
Torque converter
Clutch
(brake
)
Torque converter clutch piston
H
y
draulic control
Pow
e
rtrain
D
iagnostic category
Pos
s
ible c
aus
es
Electrical
Disordered selector lever cable
Disordered transmission range sw
itch
Faulty line pressure
Faulty engine idle speed
7A2-102 TRANSMISSION CONTROL SYSTEM (JR405E)
A1: Vehicle Does Not Run in D, 3, 2 L and R Range
A2: Vehicle Does Not Run in R Range
Checks
Action
Definition:
Vehicle does not run even though the accelerator pedal is being stepped on.
Diagnosis Hints
Trouble in transmission main unit is suspected. The trouble in the transmission main
unit may originate from the input circuits or output circuits; these circuits should also be
checked to prevent a reoccurrence of the trouble.
Transmission Range Switch &
Selector Lever Cable Checks
Inspect the transmission range switch and selector lever cable for misadjusting or
disordering. Refer to On-Vehicle Service section.
Transmission Fluid Checks
Inspect the transmission fluid for the following conditions. If the transmission fluid is
extremely blacked, contaminated or smells burnt, slipping of clutch is suspected.
• Low quantity
• Contamination
• Smell
Line Pressure Checks
Inspect the line pressure in all ranges for a possible dropped pressure. Refer to Line
Pressure Test in Test Instruction section.
Stall Speed Checks
Inspect the stall speed in all ranges. Refer to Stall Test in Test Instruction section.
Control Valve Body Checks
Inspect the valve body for the following conditions.
• Faulty operation
• Sticking spool valve
• Sticking shift solenoid valve. Perform function check. Refer to On-Vehicle Service
section.
• Clogged hydraulic circuit
Torque Converter Checks
Inspect the torque converter for faulty operation or sticking.
Clutch and Brake Checks
Inspect the low clutch, reverse clutch, low one-way clutch and low & reverse brake for
slipping.
Additional Checks
• Inspect the parking mechanism for faulty operation.
• Inspect the engine for proper outputs.
Checks
Action
Definition:
Vehicle does not run in R range only. It runs correctly in forward range.
Diagnosis Hints
Trouble in transmission main unit is suspected. The trouble in the transmission main
unit may originate from the input circuits or output circuits; these circuits should also
be checked to prevent a reoccurrence of the trouble.
Transmission Range Switch &
Selector Lever Cable Checks
Inspect the transmission range switch and selector lever cable for misadjusting or
disordering. Refer to On-Vehicle Service section.
Transmission Fluid Checks
Inspect the transmission fluid for the following conditions. If the transmission fluid is
extremely blacked, contaminated or smells burnt, slipping of clutch is suspected.
• Low quantity
• Contamination
• Smell
Line Pressure Checks
Inspect the line pressure in R range for a possible dropped pressure. Refer to Line
Pressure Test in Test Instruction section.
Stall Speed Checks
Inspect the stall speed in R range. Refer to Stall Test in Test Instruction section.
TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-103
A3: Vehicle Does Not Run in D, 3, 2 and L Range
B1: Vehicle Runs in N Range
Control Valve Body Checks
Inspect the valve body for the following conditions.
• Faulty operation
• Sticking spool valve
• Sticking shift solenoid valve. Perform function check. Refer to On-Vehicle Service
section.
• Clogged hydraulic circuit
Torque Converter Checks
Inspect the torque converter for faulty operation or sticking.
Clutch and Brake Checks
Inspect the reverse clutch and low & reverse brake for slipping.
Additional Checks
• Inspect the parking mechanism for faulty operation.
• Inspect the engine for proper outputs.
Checks
Action
Checks
Action
Definition:
Vehicle does not run in D, 3, 2 and L range only. It runs correctly in R range.
Diagnosis Hints
Trouble in transmission main unit is suspected. The trouble in the transmission main
unit may originate from the input circuits or output circuits; these circuits should also be
checked to prevent a reoccurrence of the trouble.
Transmission Range Switch &
Selector Lever Cable Checks
Inspect the transmission range switch and selector lever cable for misadjusting or
disordering. Refer to On-Vehicle Service section.
Transmission Fluid Checks
Inspect the transmission fluid for the following conditions. If the transmission fluid is
extremely blacked, contaminated or smells burnt, slipping of clutch is suspected.
• Low quantity
• Contamination
• Smell
Line Pressure Checks
Inspect the line pressure in forward ranges for a possible dropped pressure. Refer to
Line Pressure Test in Test Instruction section.
Stall Speed Checks
Inspect the stall speed in forward ranges. Refer to Stall Test in Test Instruction section.
Control Valve Body Checks
Inspect the valve body for the following conditions.
• Faulty operation
• Sticking spool valve
• Sticking shift solenoid valve. Perform function check. Refer to On-Vehicle Service
section.
• Clogged hydraulic circuit
Torque Converter Checks
Inspect the torque converter for faulty operation or sticking.
Clutch and Brake Checks
Inspect the low clutch and low one-way clutch for slipping.
Additional Checks
• Inspect the parking mechanism for faulty operation.
• Inspect the engine for proper outputs.
Checks
Action
Definition:
Creeping force appears in N range. Vehicle moves unless the brake pedal is stepped on in N range.
Diagnosis Hints
Trouble in transmission main unit is suspected. The trouble in the transmission main
unit may originate from the input circuits or output circuits; these circuits should also be
checked to prevent a reoccurrence of the trouble.
Transmission Range Switch &
Selector Lever Cable Checks
Inspect the transmission range switch and selector lever cable for misadjusting or
disordering. Refer to On-Vehicle Service section.
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