Isuzu KB P190. Manual - part 1095

7A2-96   TRANSMISSION CONTROL SYSTEM (JR405E)

Faulty Gearshift

Engine 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.

TRANSMISSION CONTROL SYSTEM (JR405E)   7A2-97

Faulty Operation in Stopping

Vehicle moves in P range or parking is not disengaged in other than P
range

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.

7A2-98   TRANSMISSION CONTROL SYSTEM (JR405E)

A1

Vehicle does not run in D

, 3, 2, L & L range

A2

Vehicle does not run in R

 range

A3

Vehicle does not run in D

, 3, 2 and L range

B1

Vehicle runs in N

 range

B2

Poor acceleration at starting

B3

Engine races up during starting (slip)

B4

Large shock w

hen selector lev

er is changed

from N

 to D

 range or N

 to R

 range

B5

Engine stalls w

hen selector lev

er 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

Ex

tended time lag w

hen selector lev

e

r is

changed from N

 to D

B9

Ex

tended time lag w

hen selector lev

e

r is

changed from N

 to R

B10

Brake is applied in R

 range

B11

Insufficient starting or shaking in D

 range

B12

N

oise or v

ibration 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

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)   7A2-99

C1

Engine race up (slipping) w

hen gearshift is

up from 1st to 2nd

C2

Engine race up (slipping) w

hen gearshift is

up from 2nd to 3rd

C3

Engine race up (slipping) w

hen gearshift is

up from 3rd to 4th

C4

Engine race up (slipping) w

hen gearshift is

dow

n from 4th to 3rd

C5

Engine race up (slipping) w

hen gearshift is

dow

n (or kick-dow

n) from 4th to 2nd

C6

Engine race up (slipping) w

hen gearshift is

dow

n (or kick-dow

n) from 3rd to 2nd

C7

Engine race up (slipping) w

hen gearshift is

dow

n (or kick-dow

n) from 4th or 3rd to 2nd

C8

Engine race up (slipping) others

C9

Braking feel w

hen gearshift is up from 1st to

2nd

C1

0

Braking feel w

hen gearshift is up from 2nd to

3rd

C1

1

Braking feel w

hen gearshift is up from 3rd to

4th

C1

2

Large shock w

hen gearshift from 1st to 2nd

or 2nd to 1st

C1

3

Large shock w

hen gearshift from 2nd to 3rd

or 3rd to 2nd

C1

4

Large shock w

hen gearshift from 3rd to 4th

or 4th to 3rd

C1

5

Large shock w

hen kick-dow

n

C1

6

Large shock w

hen accelerator pedal is

stepped O

N

 or O

FF w

ithout gearshift

C1

7

Large shock w

hen gearshift from 2nd to 1st

in L range

C1

8

Large shock others

C1

9

Large shock w

hen v

ehicle speed is reduced

by

 no accelerator pedal or v

ehicle is stopped

C2

0

Large shock at lock up

C2

1

Shift dow

n or engine ov

errun w

hen

accelerator pedal is stepped O

N

 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

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