torque ISUZU KB P190 2007 Workshop Repair Manual

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

7A2-104 TRANSMISSION CONTROL SYSTEM (JR405E)
B2: Poor Acceleration at Starting
Transmission Fluid ChecksInspect 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
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
Clutch and Brake Checks Inspect the low clutch, reverse clutch, low one-way clutch and low & reverse brake for
seizing.
Checks
Action
ChecksAction
Definition:
Starting acceleration is poor.
Diagnosis Hints In addition to the low engine output, faulty gearshift of the transmission or fixing at the
3rd gear in the fail-safe operation may also be possible. Therefore, if “maximum speed
is low, and acceleration is poor”, it should be cleared up whether the trouble originates
from the engine system or transmission control system by a running test, inspection of
stall speed, etc.
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.
Clutch and Brake Checks Inspect the low clutch and high clutch for slipping.
Additional Checks • Inspect the engine for proper outputs. Refer to appropriate inspection chart in
engine section.
• Inspect the TCM grounds for being clean, tight, and in their proper locations.
• Observe the Accelerator Pedal Position (APP). APP parameter should change linearly from 0 to 99 or 100% according to the accelerator pedal operation.

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ISUZU KB P190 2007

7A2-106 TRANSMISSION CONTROL SYSTEM (JR405E)
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 Range
B7: Engine Cranks in other than P or N Range
B8: Extended Time Lag When Selector Lever is Changed from N to D
Checks Action
Definition:
The engine stalls when selector lever is changed from N or P position to a run position during engine idling.
Diagnosis Hints • As the correct cause is attributable to the engine, faulty idle up, insufficient
engine output, etc. are suspected.
• As this is a cause of the transmission, faulty torque converter clutch (TCC) piston is suspected.
• If the transmission fluid through resistance increases due to clogged oil cooler or some other reason, or if the transmission fluid level decreases, the TCC piston
works causing the engine stall.
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 lock up spool valve
• Sticking TCC solenoid valve. Perform function check. Refer to On-Vehicle Service section.
• Clogged hydraulic circuit
Additional Checks • Inspect the engine for proper outputs. Refer to appropriate inspection chart in
engine section.
• Inspect the engine for proper idle speed.
Checks Action
Definition: • The engine starter does not run even though the P or N range.
• The engine starter runs even though the R, D, 3, 2 or L range.
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.
Checks Action
Definition:
The shift time lag is longer than the standard value when the selector lever is changed from N to D.
Transmission Fluid Checks Inspect the transmission fluid for low quantity.
Line Pressure Checks Inspect the line pressure in D range for a possible dropped pressure. Refer to Line
Pressure Test in Test Instruction section.

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ISUZU KB P190 2007

7A2-110 TRANSMISSION CONTROL SYSTEM (JR405E)
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-down
C16: 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 Others
C19: Large Shock When Vehicle Speed is Reduced by No Accelerator Pedal or Vehicle is Stopped
C20: Large Shock at Lock Up
C21: Shift Down or Engine Overrun When Accelerator Pedal is Stepped ON in 4th Gear
D1: Faulty Gearshift Schedule (Different from Shift Speed Chart)
Checks Action
Definition: • A large shock is felt when the accelerator pedal is stepped on for acceleration and the gear is shifted up or down.
• A large shock is felt when the accelerator pedal is stepped on for kick-down.
• A large shock is felt when the accelerator pedal is not stepped on.
• A large shock is felt when the selector lever is selected in L range.
Diagnosis Hints The same causes as in category No. “C1 - C8: Engine Race Up (Slipping)” are
suspected.
Checks Action
Definition:
A large shock is felt at lock up.
Diagnosis Hints Incorrect input signals or faulty operation of torque converter clutch is suspected.
Refer to category No. “I1: No Lock Up.”
Checks Action
Definition:
Shift down or engine overrun occurs above than kick-down area.
Diagnosis Hints The same causes as in category No. “C1 - C8: Engine Race Up (Slipping)” are
suspected.
Checks Action
Definition:
Faulty gearshift schedule, it is differ from the shift speed chart.

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ISUZU KB P190 2007

7A2-114 TRANSMISSION CONTROL SYSTEM (JR405E)
F1: Low Maximum Speed or Poor Acceleration
F2: Engine Race Up (Slipping) During Acceleration
Control Valve Body ChecksInspect 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
Checks
Action
ChecksAction
Definition: • Starting acceleration is poor.
• Acceleration is slow, even though the accelerator pedal is stepped on during the running.
Diagnosis Hints In addition to the low engine output, faulty gearshift of the transmission or
fixing at the 3rd gear in the fail-safe operation may also be possible.
Therefore, if “maximum speed is low, and acceleration is poor”, it should be
cleared up whether the trouble originates from the engine system or
transmission control system by a running test, inspection of stall speed, etc.
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.
Clutch and Brake Checks Inspect the low clutch and high clutch for slipping.
Additional Checks • Inspect the engine for proper outputs. Refer to appropriate inspection
chart in engine section.
• Inspect the TCM grounds for being clean, tight, and in their proper locations.
• Observe the Accelerator Pedal Position (APP). APP parameter should change linearly from 0 to 99 or 100% according to the accelerator pedal
operation.
Checks Action
Definition: • Engine speed increases but the vehicle speed does not increase when the accelerator pedal is being stepped on.

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7A2-116 TRANSMISSION CONTROL SYSTEM (JR405E)
G2: Large Creeping Force
G3: Small Creeping Force
G4: Large Noise During Idle with Vehicle Stop
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.
Additional Checks Inspect the parking mechanism for faulty operation. Checks Action
Checks
Action
Definition:
Vehicle accelerates in R, D, 3, 2 or L range, even though the accelerator pedal is not being stepped on.
Diagnosis Hints Too high idle speed is suspected. Inspect the engine for proper idle speed.
Checks Action
Definition:
Vehicle does not move, even though a run position is selected on a flat road during idling.
Diagnosis Hints When the creep force is small in all positions, low engine output is suspected.
If the creep is normal only in the R position, operation of the fail-safe function
due to trouble in the electrical system is suspected.
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.
Clutch and Brake Checks Inspect the low clutch for slipping.
Additional Checks • Inspect the engine for proper outputs. Refer to appropriate inspection
chart in engine section.
• Inspect the TCM grounds for being clean, tight, and in their proper locations.
• Inspect the ground return circuit for being clean, tight, and in their proper locations.
Checks Action
Definition:
Transmission is noisy during idle in all range.

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TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-117
H1: Judder Occurs at Lock Up
H2: Large Shock at Lock Up
H3: Lock Up Point is High or Low
I1: No Lock Up
Diagnosis Hints • Causes such as the solenoid operating sound or a faulty oil pump are
suspected.
• Distinguishing is possible by stopping the solenoid operation temporarily, checking the correlation for the former case and, changing
the line pressure and confirming the correlation with noise.
• As a matter of course, noise other than the transmission may be generated around the engine, and should be checked carefully.
Notice: When the noise is generated only at the time of a gear shift, it may
be the sound of transmission fluid flowing or gear noise. If the sound varies
depending on the gear speed to be shifted, it may be the gear noise
generated from the planetary gear and its components. If the sound varies
depending on the vehicle speed, it may be the gear noise of the output
system, or the gear noise of the input system or a faulty torque converter.
Checks
Action
Checks Action
Definition:
Judder occurs when lock up area.
Diagnosis Hints Slip due to burning of the torque converter clutch (TCC) facing or insufficient
engagement due to dropped working pressure are suspected. Refer to
category No. “l1: No Lock Up “.
Notice: When the TCC facing has burnt, foreign material mixed in the oil
cooler is suspected. In such a case, inspect the oil cooler circuit for clogging
of the oil cooler.
Checks Action
Definition: • A large shock is felt at lock up.
• Lock up point is excessively high or low.
Diagnosis Hints Incorrect input signals or faulty operation of torque converter clutch (TCC) is
suspected. Refer to category No. “I1: No Lock Up”.
Checks Action
Definition:
Lock up is not performed even though lock up control conditions being satisfied.
Diagnosis Hints • Monitor the signal to the torque converter clutch (TCC) solenoid valve
while carrying out a running test.
• When the transmission fluid temperature is lower than 20 °C (68 °F),
lock up control is inhibited.
• When the output signal to the TCC solenoid valve is sent correctly, causing no lock up, clogged hydraulic circuits or malfunction of the TCC
piston may be suspected.
• Even with the lock up area, the output signal to the TCC solenoid valve is not sent, a fault of the transmission fluid temperature (TFT) sensor
controlling the lock up may be suspected.
Notice: When the TCC facing has burnt, foreign material mixed in the oil
cooler is suspected. In such a case, inspect the oil cooler circuit for clogging
of the oil cooler.

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