Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1864
7A2-72 DIAGNOSIS
Step
Action
Yes
No
8
Connect the Tech 2, and with the key switch in OFF position, short
the terminals 11 and 7 on the vehicle harness side. Does the
indication of the 2-4 brake pressure switch on the Tech 2 becomes
on when the key switch is turned on?
Go to Step 9
Repair the harness
or connector.
Go to Step 12
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 teminal 7 and 2-4 brake pressure switch connector?
7
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 2-4 brake
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
DIAGNOSIS 7A2-73
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 SW
H22
(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.
7A2-74 DIAGNOSIS
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
DIAGNOSIS 7A2-75
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 teminal 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
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