2007 ISUZU KB P190 engine

7A2-96 TRANSMISSION CONTROL SYSTEM (JR405E)
Faulty GearshiftEngine race up (slipping) when gearshift is up from 1st to 2nd C1
Engine race up (slipping) when gearshift is up from 2nd to 3rd C2
Engine race up (slipping) when gearshift is up from 3rd to 4th C3
Engine race up (slipping) when gearshift is down from 4th to 3rd C4
Engine race up (slipping) when gearshift is down (or kick-down) from
4th to 2nd C5
Engine race up (slipping) when gearshift is down (or kick-down) from
3rd to 2nd C6
Engine race up (slipping) when gearshift is down (or kick-down) from
4th or 3rd to 2nd C7
Engine race up (slipping) others C8
Braking feel when gearshift is up from 1st to 2nd C9
Braking feel when gearshift is up from 2nd to 3rd C10
Braking feel when gearshift is up from 3rd to 4th C11
Large shock when gearshift from 1st to 2nd or 2nd to 1st C12
Large shock when gearshift from 2nd to 3rd or 3rd to 2nd C13
Large shock when gearshift from 3rd to 4th or 4th to 3rd C14
Large shock when kick-down C15
Large shock when accelerator pedal is stepped ON or OFF without
gearshift C16
Large shock when gearshift from 2nd to 1st in L range C17
Large shock others C18
Large shock when vehicle speed is reduced by no accelerator pedal or
vehicle is stopped C19
Large shock at lock up C20
Shift down or engine overrun when accelerator pedal is stepped ON in
4th gear C21
Faulty Shift Pattern Faulty gearshift schedule (different from shift speed chart) D1
Gearshift frequently D2
Gearshift point is low or high at all points D3
Gearshift point is low or high at limited area D4
No kick-down D5
No or Error Gearshift No gearshift E1
Only 4th gear is not selectable E2
Gear is changed from 2nd to 3rd in 2 range E3
Gear is changed from 1st to 2nd in L range E4
Gear is changed from 3rd to 4th in 3 range E5
Faulty Operation During Running Low maximum speed or poor acceleration F1
Only 4th gear is not selectable F2
Noise or vibration occurs during in R, D, 3, 2 or L range F3
Engine brake does not apply in L range F4
Engine stalls before vehicle stops from running F5
Diagnostic Category
Category No.

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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-97
Faulty Operation in Stopping Vehicle moves in P range or parking is not disengaged in other than Prange G1
Large creeping force G2
Small creeping force G3
Large noise during idle with vehicle stop G4
Faulty Lock Up Judder Occurs at Lock Up H1
Large Shock at Lock Up H2
Lock Up Point is High or Low H3
No Lock Up No Lock Up I1
Transmission Fluid Leak Transmission fluid leaks from breather J1
Transmission fluid leaks between engine and converter housing J2
Transmission fluid leaks between converter housing and transmission
case J3
Transmission fluid leaks between transmission case and extension
housing J4
Transmission fluid leaks from oil pan J5
Transmission fluid leaks from manual shaft oil seal J6
Transmission fluid leaks from oil cooler pipe joint J7
Others Transmission overheat Z1
Mode lamp (power drive or 3rd start) does not turn On Z2
Mode lamp (power drive or 3rd start) does not turn Off Z3
A/T oil temperature lamp turns On Z4
Selector lever feeling is faulty Z5
Poor fuel consumption Z6
Shift indicator is faulty Z7
Abnormal smell Z8
Transmission fluid quantity is low or high Z9
Transmission fluid quantity is low or high Z10
Abnormal transmission fluid pressure Z11
Diagnostic Category
Category No.

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ISUZU KB P190 2007

7A2-98 TRANSMISSION CONTROL SYSTEM (JR405E)
A1Vehicle does not run in D, 3, 2, L & L rangeA2Vehicle does not run in R rangeA3Vehicle does not run in D, 3, 2 and L rangeB1Vehicle runs in N rangeB2Poor acceleration at startingB3Engine races up during starting (slip)B4
Large shock when selector lever is changed
from N to D range or N to R range
B5
Engine stalls when selector lever is changed
from N to R, D, 3, 2 or L range
B6 Engine does not crank in P or N rangeB7Engine cranks in other than P or N rangeB8
Extended time lag when selector lever is
changed from N to D
B9
Extended time lag when selector lever is
changed from N to R
B10 Brake is applied in R rangeB11Insufficient starting or shaking in D rangeB12Noise or vibration occurs at starting
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
Power drive or 3rd start switch
Transmission range switch
TCM power 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 switch
2-4 brake fluid pressure switch
High clutch fluid pressure switch
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
Diagnostic category


Possible causes
Electrical
Disordered selector lever cable
Disordered transmission range switch
Faulty line pressure
Faulty engine idle speed
Clutch (brake)
Torque converter clutch piston
Hydraulic control
Powertrain

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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-99
C1
Engine race up (slipping) when gearshift is
up from 1st to 2nd
C2
Engine race up (slipping) when gearshift is
up from 2nd to 3rd
C3
Engine race up (slipping) when gearshift is
up from 3rd to 4th
C4
Engine race up (slipping) when gearshift is
down from 4th to 3rd
C5
Engine race up (slipping) when gearshift is
down (or kick-down) from 4th to 2nd
C6
Engine race up (slipping) when gearshift is
down (or kick-down) from 3rd to 2nd
C7
Engine race up (slipping) when gearshift is
down (or kick-down) from 4th or 3rd to 2nd
C8 Engine race up (slipping) othersC9
Braking feel when gearshift is up from 1st to
2nd
C10
Braking feel when gearshift is up from 2nd to
3rd
C11
Braking feel when gearshift is up from 3rd to
4th
C12
Large shock when gearshift from 1st to 2nd
or 2nd to 1st
C13
Large shock when gearshift from 2nd to 3rd
or 3rd to 2nd
C14
Large shock when gearshift from 3rd to 4th
or 4th to 3rd
C15 Large shock when kick-downC16
Large shock when accelerator pedal is
stepped ON or OFF without gearshift
C17
Large shock when gearshift from 2nd to 1st
in L range
C18 Large shock othersC19
Large shock when vehicle speed is reduced
by no accelerator pedal or vehicle is stopped
C20 Large shock at lock upC21
Shift down or engine overrun when
accelerator pedal is stepped ON in 4th gear
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
Power drive or 3rd start switch
Transmission range switch
TCM power 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 switch
2-4 brake fluid pressure switch
High clutch fluid pressure switch
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
Hydraulic control
Powertrain
Diagnostic category


Possible causes
Electrical
Disordered selector lever cable
Disordered transmission range switch
Faulty line pressure
Faulty engine idle speed

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ISUZU KB P190 2007

7A2-100 TRANSMISSION CONTROL SYSTEM (JR405E)
D1
Faulty gearshift schedule (different from shift
speed chart)
D2 Gearshift frequentlyD3Gearshift point is low or high at all pointsD4Gearshift point is low or high at limited areaD5No kick-downE1No gearshiftE2Only 4th gear is not selectableE3Gear is changed from 2nd to 3rd in 2 rangeE4Gear is changed from 1st to 2nd in L rangeE5Gear is changed from 3rd to 4th in 3 rangeF1Low maximum speed or poor accelerationF2Only 4th gear is not selectableF3
Noise or vibration occurs during in R, D, 3, 2
or L range
F4 Engine brake does not apply in L rangeF5
Engine stalls before vehicle stops from
running
G1
Vehicle moves in P range or parking is not
disengaged in other than P range
G2 Large creeping forceG3Small creeping forceG4Large noise during idle with vehicle stopH1Judder Occurs at Lock UpH2Large Shock at Lock UpH3Lock Up Point is High or LowI1No Lock 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
Power drive or 3rd start switch
Transmission range switch
TCM power 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 switch
2-4 brake fluid pressure switch
High clutch fluid pressure switch
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
Diagnostic category


Possible causes
Electrical
Disordered selector lever cable
Disordered transmission range switch
Faulty line pressure
Faulty engine idle speed
Clutch (brake)
Torque converter clutch piston
Hydraulic control
Powertrain

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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-101
J1Transmission fluid leaks from breatherJ2
Transmission fluid leaks between engine
and converter housing
J3
Transmission fluid leaks between converter
housing and transmission case
J4
Transmission fluid leaks between
transmission case and extension housing
J5 Transmission fluid leaks from oil panJ6
Transmission fluid leaks from manual shaft
oil seal
J7
Transmission fluid leaks from oil cooler pipe
joint
Z1 Transmission overheatZ2
Mode lamp (power drive or 3rd start) does
not turn On
Z3
Mode lamp (power drive or 3rd start) does
not turn Off
Z4 A/T oil temperature lamp turns OnZ5Selector lever feeling is faultyZ6Poor fuel consumptionZ7Shift indicator is faultyZ8Abnormal smellZ9Transmission fluid quantity is low or highZ10 Transmission fluid quantity is low or highZ11Abnormal 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
Power drive or 3rd start switch
Transmission range switch
TCM power 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 switch
2-4 brake fluid pressure switch
High clutch fluid pressure switch
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
Hydraulic control
Powertrain
Diagnostic category


Possible causes
Electrical
Disordered selector lever cable
Disordered transmission range switch
Faulty line pressure
Faulty engine idle speed

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ISUZU KB P190 2007

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
ChecksAction
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.

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ISUZU KB P190 2007

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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ISUZU KB P190 2007