switch ISUZU TF SERIES 2004 Workshop Manual

7A2-72 DIAGNOSIS (JR405E)
DTC P1863 (Flash Code 28) High Clutch Pressure Switch Failure



Control Valve

TCM
B1
B12
B20
RED/YEL
WHT/BLK
2-4 Brake Pressure SW
Terminal
Assembly
YEL
E54 (7)
(12)
(1)H23 (12)
(10)C95 (1)
(12)
(20)
RED/YEL
YEL
WHT/BLK
L&R Brake Pressure SW
High Clutch Pressure SWH22 (8)




Pre-setting Condition:

No gear shifting.

No Check Trans indicator lamp.

No system voltage failure.

No inhibitor switch failure.

2-4 brake duty solenoid 0 or 100 %.

ATF temperature more than 60 C.

ATF input voltage more than 0.1V.

Engine speed more than 500 rpm.

DIAGNOSIS (JR405E) 7A2-73

Setting Condition:

During the running, the high clutch pressure switch does not turn on though hydraulic pressure is supposed to be
generated in high clutch.
(All pre-setting conditions are met for 2.5 seconds, high clutch pressure switch off, 2-4 brake pressure switch on
and gear ratio more than 0.65 or less than 0.74 with 4th gear in D range.)
Or

During the running, the high clutch pressure switch does not turn off though no hydraulic pressure is supposed
to be generated in the high clutch.
(All pre-setting conditions are met for 2.5 seconds, high clutch pressure switch on in P, R or N range.)

Fail Safe:

No fail safe function

Possible Cause:

High clutch duty solenoid malfunction.

High clutch pressure switch open circuit or short circuit.

Open circuit, short circuit to battery or short circuit to ground of the harness between high clutch pressure switch
terminal 1 and TCM terminal B20 (C95).

High clutch hydraulic circuit malfunction in the control valve.

Poor connection of each connector.

Reference:
When the high clutch pressure switch is operated, following signal is outputted.
Measurement terminal: B20 (C95) and B22 (C95)
-At other than 3rd or 4th gear: More than 10V
-At 3rd or 4th gear: Less than 1V

7A2-74 DIAGNOSIS (JR405E)
Step Action Yes No
1 Clear the DTC from the memory once.
Was the action complete?
Go to Step 2
Refer DTC clear
method in this
manual.
2 Turn the ignition switch off once, then restart the engine and in R
range. When about 10 seconds elapsed, does the CHECK TRANS
lamp blink?
Go to Step 3 Go to Step 7
3 Is the DTC P0763 (33) High Clutch Duty Solenoid Failure stored?
Go to P0763 (33)
Section Go to Step 4
4 Connect the Tech 2 and select the item for high clutch pressure
switch. Is the indication of high clutch pressure switch turned off
when the terminal assembly connector is disconnected?
Go to Step 5
Repair the harness
or connector.
Go to Step 12
5 Turn the key switch off and disconnect the terminal assembly
connector. Are the pins correct?
Go to Step 6
Repair the
connector or pin.
Go to Step 12
6 Remove the oil pan. Is the continuity correct between terminal
assembly terminal 1 and high clutch pressure switch connector?

1

Repair the harness
or connector.
Go to Step 12
Replace pressure
switch.
Go to Step 12
7 Start the engine and shift to 4th gear in the D range. When about 10
seconds elapsed, does the CHECK TRANS lamp blink?
Go to Step 8
Go to P0763 (33)
Section
8 Connect the Tech 2, and with the key switch in OFF position, short
the terminals 11 and 1 on the vehicle harness side. Does the
indication of the high clutch pressure switch on the Tech 2 turn on
when the key switch is turned on?
Go to Step 9
Repair the harness
or connector.
Go to Step 12

DIAGNOSIS (JR405E) 7A2-75
Step Action Yes No
9 Check if the trouble is caused by a poor connection of terminal
assembly connector.
With the key switch in OFF position, is the connection condition of
the connector and harness correct?
Go to Step 10
Repair the harness
or connector. Go to
Step 12
10 Remove the oil pan. Is the continuity correct between terminal
assembly terminal 1 and high clutch pressure switch connector?

1
Go to Step 11
Repair the harness
or connector.
Go to Step 12
11 Is the result OK when the oil pan is removed and the high clutch
pressure switch is checked? Repair the control
valve.
Go to Step 12
Replace pressure
switch.
Go to Step 12
12 Clear the DTC from the memory and perform the work after repair.
Is the same DTC code outputted again in the subsequent DTC
check?
Replace the TCM Go to Step 13
13 Are the other DTCs outputted?
Go to Other DTC
Section Action is completed

7A2-76 DIAGNOSIS (JR405E)
DTC P0731 (Flash Code 41) 1st Gear Ratio Error
DTC P0732 (Flash Code 42) 2nd Gear Ratio Error
DTC P0733 (Flash Code 43) 3rd Gear Ratio Error
DTC P0734 (Flash Code 44) 4th Gear Ratio Error

Pre-setting Condition:

No other DTCs.

2 seconds elapsed after D, 3, 2, or 1 range was selected.

Vehicle is running at the vehicle speed over 10 km/h with the turbine speed over 1000 rpm.

Except at the gear shifting.

ATF temperature more than 60C.

No fail safe valve malfunction.

Setting Condition:
In the case pre-setting conditions are met, the TCM calculates the turbine speed that corresponds to the gear ratio
of the outputted solenoid pattern in about 7 seconds after each gear shift has completed, and when the output shaft
speed against the turbine speed exceeds 500 rpm.

Fail Safe:

No fail safe function

Possible Cause:

Turbine sensor or speed sensor malfunction.

Shift solenoid malfunction.

Clutch slipping.

Step Action Yes No
1 Turn the key switch on and check the DTC. Are the DTC other
than gear ratio error outputted? Go to Other DTC
Section Go to Step 2
2 Clear the DTC from the memory. Turn the key switch off once,
and then start the engine. Does the CHECK TRANS blink
when the gear shift is repeated 3 times from 1st to 4th in the D
range? Go to Other DTC
Section Go to Step 3
3 Check again the DTC. Are all codes indicating gear ratio error
outputted?

Even if one of DTC
indicating gear ratio
error is outputted
Go to step 5

Go to Step 4
DTC indicating gear
ratio error are not
outputted at all.
Go to step 9
4 Check the turbine sensor and the speed sensor for function. Is
the result OK?
Go to Step 9
Replace turbine speed
sensor.
Go to Step 9
5 Are the color and smell of ATF normal? Go to Step 6 Go to Step 9

7A2-78 DIAGNOSIS (JR405E)
DTC P1750 (Flash Code 51) Low & Reverse Brake Fail-safe Valve Failure

Low & Reverse Brake Fail Valve (B)Control Valve Upper Body
Low & Reverse Brake Fail Valve (A)Control Valve Lower Body

Setting Condition:

When the oil pressure generated and low & reverse brake pressure switch operates off/on twice, the TCM
detected an operation failure of the low & reverse brake fail-safe valve in D, 3, 2, L range.

Fail Safe:

When the vehicle is running, the gear position selected at the trouble detection is held and the lock-up is
inhibited.

After the vehicle stopped, all solenoid operations stop (OFF) and the gear is fixed to the 3rd.

Possible Cause:

Stick of low & reverse brake fail-safe valve.

Low & reverse brake pressure switch does not turn on.

Short circuit to ground of harness low & reverse brake pressure switch.

Poor connection of each connector of harness in low & reverse brake pressure switch.

DIAGNOSIS (JR405E) 7A2-79

Step Action Yes No
1 Turn the key switch on and check the DTC. Is only the DTC for
low & reverse brake fail-safe valve failure outputted?
Go to Step 2
Go to Other DTC
Section
2 Clear the DTC from the memory. Turn the key switch off once,
and then start the engine. Does the CHECK TRANS blink
when the D range is selected and about 10 seconds elapsed?
Go to Other DTC
Section Go to Step 3
3 Run the vehicle, shift the gear from 1st to 4th, stop the vehicle,
and again shift the gear from 1st to 4th. Does the CHECK
TRANS blink at this time?
Go to Step 4
The low & reverse
brake fail-safe valve
may be faulty
temporarily.
Go to step 5
4 Turn the key switch on and check the DTC. Is only the DTC for
the low & reverse brake fail-safe valve failure outputted?
Repair or replace the
control valve.
Go to Step 5
Go to Other DTC
Section
5 Clear the DTC from the memory and perform the work after
repair. Is the same DTC code outputted again in the
subsequent DTC check?
Replace the TCM Go to Step 6
6 Are the other DTCs outputted?
Go to Other DTC
Section Action is completed

7A2-80 DIAGNOSIS (JR405E)
DTC P1755 (Flash Code 52) 2-4 Brake Fail-safe Valve Failure

Control Valve Upper Body2-4 Brake Fail Valve (B)
Control Valve Lower Body2- 4 Br ake Fai l Val ve ( A)

Setting Condition:

When the oil pressure generated and 2-4 brake pressure switch operates off/on twice, the TCM detected an
operation failure of the low & reverse brake fail-safe valve in D, 3, 2, L range.

Fail Safe:

When the vehicle is running, the gear position selected at the trouble detection is held and the lock-up is
inhibited.

After the vehicle stopped, all solenoid operations stop (OFF) and the gear is fixed to the 3rd.

Possible Cause:

Stick of 2-4 brake fail-safe valve.

2-4 brake pressure switch does not turn on.

Short to ground of harness 2-4 brake pressure switch.

Faulty fitting of each connector of harness in 2-4 brake pressure switch.

DIAGNOSIS (JR405E) 7A2-81

Step Action Yes No
1 Turn the key switch on and check the DTC. Is only the DTC for
2-4 brake fail-safe valve failure outputted?
Go to Step 2
Go to Other DTC
Section
2 Clear the DTC from the memory. Turn the key switch off once,
and then start the engine. Does the CHECK TRANS blink when
the D range is selected and about 10 seconds elapsed?
Go to Other DTC
Section Go to Step 3
3 Run the vehicle, shift the gear from 1st to 4th, stop the vehicle,
and again shift the gear from 1st to 4th. Does the CHECK
TRANS blink at this time?
Go to Step 4
The 2-4 brake fail-safe
valve may be faulty
temporarily.
Go to step 5
4 Turn the key switch on and check the DTC. Is only the DTC for
the 2-4 brake fail-safe valve failure outputted?
Repair or replace the
control valve.
Go to Step 5
Go to Other DTC
Section
5 Clear the DTC from the memory and perform the work after
repair. Is the same DTC code outputted again in the
subsequent DTC check?
Replace the TCM Go to Step 6
6 Are the other DTCs outputted?
Go to Other DTC
Section Action is completed

DIAGNOSIS (JR405E) 7A2-91
SYMPTOM DIAGNOSIS

Symptom Condition Description
Oil Leak Breather Oil leaks from breather. J1
Between engine and converter housing Oil leaks between engine and converter
housing. J2
Between converter housing and main caseOil leaks between converter housing and
main case. J3
Between main case and rear housing Oil leaks between main case and rear
housing. J4
Oil pan Oil leaks from oil pan. J5
Manual shaft oil seal Oil leaks from manual shaft oil seal. J6
Oil cooler pipe Oil leaks from oil cooler pipe joint. J7
Other Transmission overheat You smell the transmission burning. Z1

The transmission smokes.
Mode lamp does not light up when the
power mode or 3rd start mode is turned on
The mode lamp on the instrument panel
does not light up though the power mode or
3rd start mode is turned on with the ignition
switch in ON position.
Z2
Mode lamp lights up when the power mode
or 3rd start mode is turned off
The mode lamp on the instrument panel
lights up though the power mode or 3rd start
mode is turned off with the ignition switch in
ON position.
Z3
Oil temperature warning lamp lights up Sometimes, the oil temperature warning
lamp lights up. Z4
Select lever feeling is faulty Select lever feeling is faulty. Z5
Poor fuel consumption Poor fuel consumption. Z6
Pattern select switch is faulty Shift pattern does not change though the
pattern select switch is turned on. Z7
Oil is splashed during the running Oil is splashed during the running. Z8
Abnormal smell Abnormal smell. Z9
Oil quantity is low or high Oil quantity is low or high. Z10
Abnormal oil pressure Oil pressure is low or high. Z11
Reverse buzzer does not ring Reverse buzzer does not ring in R range. Z12