2007 ISUZU KB P190 low oil pressure

7A2-68 TRANSMISSION CONTROL SYSTEM (AW30–40LE)

(2) Oil temperature is more than 20 °C (68 °F), and
water temperature signal is more than 70 °C
(158 °F).
(3) 20 seconds or more passed after D position is detected.
(4) Oil temperature sensor is not deciding failure.
(5) Engine coolant temperature sensor is not detecting failure or not deciding failure.
(6) The engine revolution is more than 600 rpm.
(7) Engine revolution sensor is not detecting failure o
r
not deciding failure.
(8) T/F condition is high.
(9) T/F Hi-Low SW is not detecting failure or not deciding failure.
(10) Output revolution sensor is not detecting failure o
r
not deciding failure.
(11) S1 solenoid is not detecting failure or not deciding
failure. (Electronic failure)
(12) S2 solenoid is not detecting failure or not deciding
failure. (Electronic failure)
(13) L-up solenoid is not detecting failure or not
deciding failure. (Electronic failure)
(14) Selector position switch is not detecting failure o
r
not deciding failure.
(15) DTC U2104 is not detecting failure or not deciding
failure.
(16) DTC U2105 is not detecting failure or not deciding
failure.
(17) Input revolution sensor is not deciding failure.
(18) Throttle signal is not detecting failure or not
deciding failure.
(19) Not emergency mode.
(20) Engine torque signal is not detecting failure or not
deciding failure.
(21) Pressure control solenoid is not detecting failure
not deciding failure.
(22) All of the following conditions are met.
• Device Control is not operating.
• Disable Normal Communication Service is receiving enable.
• DTC Clear is not operating.
Condition For Setting The DTC
The following conditions are detected two times or more
between ignition “ON” and ignition “OFF”.
The TCM detects following conditions are met for 1
second continuously.
• 2 second passed after gear change output and L-up “ON”/”OFF” output.
• T/C revolution difference more than 100 rpm for 1 second continuously.
• 3rd gear lock-up “OFF”.
Action Taken When The DTC Sets
• No squat control. (For preventing engine stall)
• Fix 1st gear to prevent engine stall when vehicle speed is and below 10 km/h (6 mph). (Cancel at 15
km/h {9 mph})
• Check Trans “ON”.
• DTC stored.
• MIL request “ON”. (EURO 4 only)
Conditions For Clearing The DTC
• The DTC can be cleared from the TCM history by
using a scan tool.
• The DTC will be cleared from history when the vehicle has achieved 40 warm-up cycles without a
failure reported.
•
After more than 1 second has elapsed after the
ignition key has been turned “ON”, short between
No.11 and No.4 (ground) of DLC (Data Link
Connector). Then, after 1 second, but within 6
seconds, discontinue shorting.
Diagnostic Aids
• Inspect the wiring for poor electrical connection at the TCM. Look for possible bent, backed out, deformed
or damaged terminals. Check for weak terminal
tension as well. Also check for a chafed wire that
could short to bare metal or other wiring.
Inspect for a broken wire inside the insulation.
• W hen diagnosing for a possible intermittent short o
r
open condition, move the wiring harness while
observing test equipment for a change.

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-113

(2) All of the following conditions are met.
• Device Control is not operating.
• Disable Normal Communication is receiving
enable.
• DTC Clear is not operating.

The following condition at ignition “OFF” form “ON” is
detected seven times in total in 1 cycle.
• Receiving BUS “OFF” information from CAN
controller.
Action Taken When The DTC Set
• Throttle judgment on torque reduction control, line
pressure control at stationary status, line pressure
reduction control at gear change and line pressure
reduction control at garage. (Throttle opening 100%)
• Line pressure FULL output.
• Throttle judgment on gear change control. (Throttle
opening 0%)
• No line pressure reduction control at gear change.
• No torque reduction control.
• No squat control.
• No slope control.
• No L-up control.
• Control Engine rpm at 7000rpm. (No inertia
calculation)
• Control actual torque at MAX.
• Control driver torque at MAX.
• Control engine coolant temperature at 80 °C (176 °F).
• No coast control.
• No 3rd Start mode control.
• No line pressure reduction control at garage.
• No output revolution sensor failure detection.
• No input revolution sensor failure detection.
• No selector position switch failure detection.
• No oil temperature sensor failure detection.
• No T/F Hi-Low SW failure detection.
• No speed mater signal failure detection.
• No throttle signal failure detection.
• No Engine torque signal failure detection.
• No engine coolant temperature signal failure
detection.
• No Engine revolution signal failure detection.
• No shift solenoid functional failure detection.
• No L-up solenoid functional failure detection.
• No DTC U2105 failure detection.
• Cancel engine rpm condition of prerequisite of suppl
y
voltage failure detection.
• Control vehicle speed of speed meter at 0km/h.
• No torque reduction at stall.
• No cruise control.
• No warm up control.
• DTC stored.
• Check Trans “ON”.
• MIL request “ON”. (EURO 4 only)
Conditions For Clearing The DTC
• The DTC can be cleared from the TCM history by
using a scan tool.
• The DTC will be cleared from history when the vehicle has achieved 40 warm-up cycles without a
failure reported.
•
After more than 1 second has elapsed after the
ignition key has been turned “ON”, short between
No.11 and No.4 (ground) of DLC (Data Link
Connector). Then, after 1 second, but within 6
seconds, discontinue shorting.
Diagnostic Aids
• Inspect the wiring for poor electrical connection at the
TCM. Look for possible bent, backed out, deformed
or damaged terminals. Check for weak terminal
tension as well. Also check for a chafed wire that
could short to bare metal or other wiring. Inspect for a
broken wire inside the insulation.
• W hen diagnosing for a possible intermittent short o
r
open condition, move the wiring harness while
observing test equipment for a change.
• Inspect the wiring for EMI (Electro-Magnetic
Interference). Check that all wires are properly routed
away from coil, and generator. Also check fo
r
improperly installed electrical options. W hen this test
is performed, turn “OFF” on electronic auto parts
switches to improperly for a noise preventing.


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (AW30–40LE) 7A2-117

(3) All of the following conditions are met.
• Device Control is not operating.
• Disable Normal Communication is receiving
enable.
• DTC Clear is not operating.
(4) DTC U2104 is not detecting failure or not deciding failure.
Condition For Setting The DTC
Detection standard is met for 2.5 second continuously.
Detection standard:
If one or more ID sent from Engine Control Module
(ECM) is not completed receiving for 2 basic cycles
since last receiving completion.
Action Taken When The DTC Sets
• Throttle judgment on torque reduction control, line
pressure control at stationary status, line pressure
reduction control at gear change and line pressure
reduction control at garage. (Throttle opening 100%)
• Line pressure FULL output.
• Throttle judgment on gear change control (Throttle
opening 0%).
• No line pressure reduction control at gear change.
• No torque reduction control.
• No squat control.
• No slope control (keep mode).
• No L-up control.
• Control Engine rpm at 7000rpm (No inertia
calculation).
• Control actual torque at MAX.
• Control driver torque at MAX.
• Control engine coolant temperature at 80 °C (176 °F).
• No coast control.
• No 3rd Start mode control.
• No line pressure reduction control at garage.
• No output revolution sensor failure detection.
• No C-0 rev sensor failure detection.
• No selector position switch failure detection.
• No oil temperature sensor failure detection.
• No T/F Hi-Low SW failure detection (Execute T/F
judgment using only T/F-SW ).
• No speed mater signal failure detection.
• No throttle signal failure detection.
• No Engine torque signal failure detection.
• No engine coolant temperature signal failure
detection.
• No Engine revolution signal failure detection.
• No shift solenoid functional failure detection.
• No L-up solenoid functional failure detection.
• Cancel engine rpm condition of prerequisite of suppl
y
voltage failure detection.
• Control vehicle speed of speed meter at 0km/h.
• No torque reduction at stall.
• No cruise control.
• No warm up control.
• Check Trans “ON”.
• DTC stored.
• MIL request “ON”. (EURO 4 only)
Conditions For Clearing The DTC
• The DTC can be cleared from the TCM history by
using a scan tool.
• The DTC will be cleared from history when the vehicle has achieved 40 warm-up cycles without a
failure reported.
• After more than 1 second has elapsed after the ignition key has been turned “ON”, short between
No.11 and No.4 (ground) of DLC (Data Link
Connector). Then, after 1 second, but within 6
seconds, discontinue shorting.
Diagnostic Aids
• Inspect the wiring for poor electrical connection at the
TCM. Look for possible bent, backed out, deformed
or damaged terminals. Check for weak terminal
tension as well. Also check for a chafed wire that
could short to bare metal or other wiring. Inspect for a
broken wire inside the insulation.
• W hen diagnosing for a possible intermittent short o
r
open condition, move the wiring harness while
observing test equipment for a change.
• Inspect the wiring for EMI (Electro-Magnetic
Interference). Check that all wires are properly routed
away from coil, and generator. Also check fo
r
improperly installed electrical options. W hen this test
is performed, turn “OFF” on electronic auto parts
switches to improperly for a noise preventing.


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

ON-VEHICLE SERVICE (AW30–40LE) 7A3-11
Measure Time Lag
1. Fully apply the parking brake.
2. Start the engine. Check idling speed (A/C OFF).
3. Operate the select lever from “N" to “D" position.
Using a stopwatch, measure the time it takes from
shifting the lever until the shock is felt.
Time lag: Less than 0.7 seconds
4. In same manner, measure the time lag for “N" →
“R".
Time lag: Less than 1.2 seconds
Evaluation
1. If “N" → “D" time lag is longer than specified:
• Line pressure too low
• Forward clutch malfunction
• No.2 one-way clutch not operating properly
2. If “N" → “R" time lag is longer than specified:
• Line pressure too low
• Direct clutch malfunction
• First and Reverse brake malfunction
3. If both time lag is longer than specified:
• Line pressure too low

Hydraulic Test






RTW 67ALH000201
Preparation
1. W arm up the transmission fluid.
2. Remove the transmission case test plug and mount the hydraulic pressure gauge.
Oil pressure gauge: 5-8840-0093-0
NOTE: Perform the test at normal operating fluid
temperature (50 – 80 °C or 122 – 176 °F).




BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

7A3-12 ON-VEHICLE SERVICE (AW30–40LE)
Measure Line Pressure
1. Fully apply the parking brake and chock the four
wheels.
2. Start the engine and check idling rpm.
3. Select into “D" position, step down strongly on the brake pedal with your left foot and while
manipulating the accelerator pedal with the right
foot, measure the line pressures at the engine
speeds specified in the table.
4. In the same manner, perform the test in “R" position.


Line pressure kPa (kg/cm
2/psi) Engine
speed “D" position “R" position
Idling 349 – 408
(3.6 – 4.2 /51 – 59) 577 – 675
(5.9 – 6.9/84 – 98)
Stall 1,206 – 1,353
(12.3–13.8/175–196) 1,646 – 1,979
(16.8–20.2/239–287)

Evaluation
1. If the measured values at all positions are higher
than specified:
• Pressure control solenoid defective
• Primary regulator valve defective
2. If the measured values at all positions are lowe
r
than specified:
• Primary regulator valve defective
• Oil pump defective
• Pressure control solenoid defective
3. If pressure is low in “D" position only:
• “D" position circuit fluid leakage
4. If pressure is low in “R" position only:
• “R" position circuit fluid leakage
Road Test
NOTE: Perform the test at normal operating fluid
temperature (50 – 80 °C or 122 – 176 °F).
“D" Position Test in “NORMAL", and
“POWER" Pattern
Select into the “D" position and hold the accelerator
pedal constant at the 50% and 100% throttle valve
opening positions.
Push in one of the pattern selector buttons and check
the following:

1. 1–2, 2–3, 3–OD and lock-up, upshifts should take
place, and shift points should conform to those
shown in the automatic shift diagram.


RTW 77ASH003001



RUA37ASH000101



BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

ON-VEHICLE SERVICE (AW30–40LE) 7A3-23
Solenoid
Inspection
1. Resistance check
• Using an ohmmeter, check the resistance
between each terminal (S1/S2/SL) and body.
Solenoid S1, S2 and lock-up solenoid SL
resistance:
11 – 15
Ω
ΩΩ
Ω (at 20°
°°
°C or 68
°
°°
°
F)
(Reference) 12 – 16
Ω
ΩΩ
Ω (at 40°
°°
°C or 104
°
°°
°
F)
• Using an ohmmeter, check the resistance
between each terminal (STH) and (STHG).
Pressure control solenoid resistance:
5 – 5.6
Ω
ΩΩ
Ω (at 20°
°°
°C or 68
°
°°
°
F)
(Reference) 5.4– 6.1
Ω
ΩΩ
Ω (at 40°
°°
°C or 104
°
°°
°
F)




220L100001
NOTE: If the pressure control solenoid resistance is not
within specification, replace the valve body assembly.



2. Operation check
Check the solenoid operation by blowing into an oil
hole as shown in the figure.
Solenoid S1 and S2 (Normal close type)


W hen battery terminal is disconnected No air leaks
W hen battery terminal is
connected Air passes through

Lock-up solenoid SL (Normal open type)


W hen battery terminal is disconnected Air passes through
W hen battery terminal is
connected No air leaks






244RX00001




244RY00005

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

UNIT REPAIR (AW30–40LE) 7A4–65
5. Place special tool on the spring retainer andcompress the return spring.
Using snap ring pliers, remove the snap ring.
Spring compressor : 5-8840-0254-0
248RY00003
6. Remove the piston return spring.
7. Place the forward clutch drum onto the OD suppor t. Holding the forward clutch piston by hand, apply
compressed air to the OD support to remove the
forward clutch piston.
248RY00042
8. Remove the O-rings from piston.
9. Remove the O-ring from forward clutch drum.
10. Remove the oil seal rings and thrust bearing from forward clutch drum.
Inspection and Repair
1. Check forward clutch pistonCheck that check ball is free by shaking the piston.
Check that the valve does not leak by applying
low-pressure compressed air.
248RY00031
2. Check forward clutch drum bushing. Using a dial indicator, measure the inside diameter
of the forward clutch drum bushing.
Maximum inside diameter: 24.08 mm (0.948 in) If the inside diameter is greater then the maximum,
replace the forward clutch drum.
248RY00043
3. Check disc, plate and flange. Check to see if the sliding surface of the disc, plate
and flange are worn or burnt. If necessary, replace
them.
 If the lining of the disc is peeling off or discolored,
or even if parts of the printed numbers are
defaced, replace all discs.

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

CONSTRUCTION AND FUNCTION 7A1-3

DESCRIPTION
CONSTRUCTION



































1 Converter Housing 6 Low Clutch 11 Oil Pump
2 Torque Converter 7 Low & Reverse Brake 12 Control Valve
3 High Clutch 8 Output Shaft 13 Low One-way Clutch
4 Reverse Clutch 9 Extension Housing 14 Parking Gear
5 2-4 Brake 10 Input Shaft

Figure 1. Construction of Automatic Transmission

The JR405E automatic transmission is electrically controlled by a microcomputer transmission control module
(TCM). There are four forward speeds and one reverse speed.
This JR405E automatic transmission employs a clutch pressure direct control system (Direct Electronic Shift
Control: DESC) using duty cycle type solenoids, which ensure high shift quality.
This transmission also has a learning function and constantly checks the time of each clutch and brake
required for the shift in order to match this time with the target value for the optimum shift.

The TCM will automatically select the most appropriate shift points and lock-up points depending on the
Accelerator pedal opening, the vehicle speed and the vehicle load.
If any trouble arises in the speed sensor, APP sensor, solenoid, etc., the fail-safe control function is activated
to keep the running performance.
Problems with the sensors or the solenoids can quickly be detected with the self diagnosis procedure
described in this manual.

The JR405E automatic transmission consists of the torque converter, oil pump, input shaft, out put shaft,
planetary gears and control valves.
The gear train consists of two planetary gear sets and three multiple plate clutches in combination with two
multiple plate brakes and a one-way clutch.
2WD
4WD

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007