Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Service manual — part 1769
DIAGNOSIS 7A2-127
Step
Action
Yes
No
8
Is the line pressure correct? Refer the LINE PRESSURE TEST
section in this manual.
Trouble in the AT
assembly or control
valve.
Repair the defect or
replace.
7A2-128 DIAGNOSIS
No. E3: Gear is Shifted 2nd to 3rd in 2 Range
No. E4: Gear is Shifted 1st to 2nd in L Range
No. E5: Gear is Shifted 3rd to 4th in 3 Range
Description:
•
Gear is shifted 2nd to 3rd in 2 range
•
Gear is shifted 1st to 2nd in L range
•
Gear is shifted 3rd to 4th in 3 range
Possible Cause:
•
Disordered select cable.
•
Disordered inhibitor switch.
•
Trouble in control valve body (faulty operation, sticking, clogged oil passage).
DIAGNOSIS 7A2-129
No. F1: Low Maximum Speed or Poor Acceleration
Description:
•
Starting acceleration is poor.
•
Acceleration is slow though the accelerator pedal is stepped on during the running.
Diagnosis Hints:
•
In addition to the low engine output, faulty gear shifting of AT or fixing at the 3rd position may be possible.
Therefore, in case of such a trouble that "maximum speed is low, and acceleration is poor", it should be cleared
up whether the trouble is originated from the engine system of AT system by a running test, inspection of stall
revolution, etc.
Possible Cause:
•
Clogged air cleaner, out of injection timing, dropped compression pressure, etc.
•
Fixing at 3rd position (fail-safe activated).
Since the gear is fixed at the 3rd position because of the fail-safe function, a trouble that "Maximum
speed is low, and acceleration is poor" is resulted. In this case, the DTC is memorized.
When TCM stops operation because of faulty TCM ground, the gear is fixed at the 3rd position because
of a mechanical reason. In this case, no DTC is memorized.
•
Disordered inhibitor switch .
•
Incorrect properties of throttle opening signal (serial communication) of throttle position sensor.
Throttle opening signal (serial communication) of the throttle position sensor does not change in
proportion to the throttle opening. In this case, fixing at the high or low gear results in such a trouble
that "Maximum Speed is Low and Acceleration is Poor".
•
Slip of clutch (low clutch, high clutch).
•
If slip of clutch is caused, a DTC (gear ratio error) is stored.
•
Dropped line pressure.
•
Trouble in the torque converter system (faulty operation).
Step
Action
Yes
No
1
Test Drive.
Is the gear smoothly shifted in the order of 1st to 2nd, 2nd to 3rd,
3rd to 4th gear and lock up?
Clogged air
cleaner, out of
injection timing,
dropped
compression
pressure, etc.
Go to Step 2
2
Gear ratio trouble diagnosis.
Travel in the following sequence for about 7 seconds or more in
each range: Start in the L range (1st) to 2 range (2nd) to 3 range
(3rd) to D range (4th) (to detect the gear ratio trouble exactly, this
process should be carried out)
Go to Step 3
Go to Step 3
3
Are any DTCs stored?
Go to DTC Chart
Go to Step 4
7A2-130 DIAGNOSIS
Step
Action
Yes
No
4
Are the quantity, contamination and smell normal?
If the ATF level is
low, replenish up to
the specified level.
Go to Step 5
If ATF is extremely
black and
contaminated and
smells burnt, slip of
the clutch is
supposed.
Overhaul the AT
unit.
5
Inspection of inhibitor switch using a Tech 2 or circuit tester.
When the select lever is operated, is the data display in the Tech
2 correct or voltage at each range correct?
Inhibitor SW
TCM
A2 (P)
A17 (3)
B2 (2)
B10 (N)
B11 (D)
B19 (R)
B21 (L)
C95
(2)
(10)
(11)
(19)
(21)
YEL/VIO
RED/BLK
BLU
BLK/GRN
Starter Relay
C94
(2)
(3)
B
H22
(1)
(6)
(4)
(7)
(5)
(2)
P
2
R
N
D
3
L
Start SW
PNK/BLU
E51
(2)
(4)
(8)
(5)
(1)
(9)
(6)
(3)
(10)
(7)
(38)
(15)
(3)
(37)
H4
PNK/BLK
RED/YEL
YEL/VIO
BLK/GRN
PNK/BLK
RED/BLK
BLU
RED/Y EL
PNK/BLU
BLK/WHT
BLK
BLK
BLK/WHT
Key Switch
WHT
WHT
Immobiliser Control Unit
TCM terminal
Range
A2
B19
B10
B11
B17
B2
B21
P
Battery
voltage
-
-
-
-
-
-
R
-
Battery
voltage
-
-
-
-
-
N
-
-
Battery
voltage
-
-
-
-
D
-
-
-
Battery
voltage
-
-
-
3
-
-
-
-
Battery
voltage
-
-
2
-
-
-
-
-
Battery
voltage
-
L
-
-
-
-
-
-
Battery
voltage
Go to Step 6
Adjust the inhibitor
switch.
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