Isuzu KB P190. Manual - part 1097

 

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Isuzu KB P190. Manual - part 1097

 

 

7A2-104   TRANSMISSION CONTROL SYSTEM (JR405E)

B2: Poor Acceleration at Starting 

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 

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

Checks

Action

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.

TRANSMISSION CONTROL SYSTEM (JR405E)   7A2-105

B3: Engine Races Up During Starting (Slip)

B4: Large Shock When Selector Lever is Changed from N to D Range or N to R Range

Checks

Action

Definition:
The engine speeds up but the vehicle speed does not increase when the accelerator pedal is stepped on at starting. 

Diagnosis Hints

Slipping of the clutch is suspected. Gear ratio error DTC might be set. 

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. 

• Faulty operation of transmission fluid pressure switch. Perform function check.

Refer to On-Vehicle Service section. 

• Clogged hydraulic circuit

Clutch and Brake Checks

Inspect any 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:
A large shock is felt when the selector lever is changed from N to D or N to R during idle. 

Diagnosis Hints

• Check the vehicle side such as exhaust mounting and engine mounting. 

• With the fail-safe operation, garage shock may grow worth. If there is no DTC,

faulty operation of the control valve or seized clutch might be suspected. 

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. 

Line Pressure Test

 Inspect the line pressure in D range or R range for a possible high or low pressure.
Refer to Line Pressure 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

Clutch and Brake Checks

Inspect any clutch for seizing. 

Additional Checks 

• Inspect the transmission input signals. 

• Inspect the engine for proper idle speed.

• Inspect the suspension for play. 

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. 

TRANSMISSION CONTROL SYSTEM (JR405E)   7A2-107

B9: Extended Time Lag When Selector Lever is Changed from N to R

B10: Brake is Applied in R Range 

B11: Insufficient Starting or Shaking in D Range 

Control Valve Body Checks

Inspect the valve body for the following conditions.

• Faulty operation 

• Sticking spool valve

• Clogged hydraulic circuit

Clutch and Brake Checks

Inspect the low clutch and low one-way clutch for slipping. 

Solenoid Valve Checks

• Inspect the low clutch solenoid valve for faulty operation. 

Checks

Action

Definition:
The shift time lag is longer than the standard value when the selector lever is changed from N to R. 

Transmission Fluid Checks

Inspect the transmission fluid for low quantity. 

Line Pressure Checks

 Inspect the line pressure in R range for a possible dropped pressure. Refer to Line
Pressure Test in Test Instruction section. 

Control Valve Body Checks

Inspect the valve body for the following conditions.

• Faulty operation 

• Sticking spool valve

• Clogged hydraulic circuit

Clutch and Brake Checks

Inspect the low & reverse brake for slipping. 

Solenoid Valve Checks

• Inspect the low & reverse brake solenoid valve for faulty operation. 

Checks

Action

Checks

Action

Definition:
Brake is applied suddenly 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 low quantity. 

Control Valve Body Checks

Inspect the valve body for the following conditions.

• Faulty operation 

• Sticking spool valve

• Clogged hydraulic circuit

Clutch and Brake Checks

Inspect the low clutch, high clutch or 2-4 brake for seizing. 

Additional Checks 

• Inspect the parking mechanism for faulty operation. 

Checks

Action

Definition:
Insufficient starting or shaking in D range. 

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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