2007 ISUZU KB P190 parking brake

7A2-124 TRANSMISSION CONTROL SYSTEM (JR405E)
Time Lag Test
Time Lag Test Procedure1. Fully apply the parking brake and chock all wheels.
2. Check the level of the engine oil, coolant and transmission fluid. Replenish as necessary.
3. Start the engine and warm up (allow engine coolant temperature to reach at least 70 °C
[158 °F]).
Important: Keep the brakes applied at all times in
order to prevent unexpected vehicle motion. Personal
injury may result if the vehicle moves unexpectedly.
4. Let idle and record the time lag from when the selector lever is moved from N to D or N to R range
until the shock has felt.
Standard Value
Diagnosis 1. If the time lag is out of the standard value when the selector lever is moved from N to D range.
• Forward range line pressure is low.
• Slipping of low clutch.
• Slipping of low one-way clutch. • Problem in valve body (faulty operation, sticking or
clogged hydraulic circuit).
• Faulty operation of low clutch solenoid valve.
• Shorter or faulty amount of transmission fluid.
2. If the time lag is out of the standard value when the selector lever is moved from N to R range.
• Reverse range line pressure is low
• Slipping of low & reverse brake
• Slipping of reverse clutch
• Problem in valve body (faulty operation, sticking or clogged hydraulic circuit).
• Faulty operation of low & reverse brake solenoid valve.
• Shorter or faulty amount of transmission fluid.
Selector lever position Time lag
N to D range Less than 0.7 seconds
N to R range Less than 1.2 seconds

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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-125
Road Test
Road Test Procedure
*1: Shifting at high vehicle speed, the transmission may
hold the gear position until vehicle speed gets down to
prevent engine overruning.
Notice: Perform this test at the normal transmission
fluid temperature between 50 to 80 °C (122 to 176 °F).
Drive the vehicle on level ground so as not to change to
up slope mode and down slope mode.
1. D range road test in normal and power drive mode. • Select into the D range and hold the accelerator pedal constant at the 50% and 100% accelerator
pedal position.
• 1 to 2, 2 to 3, 3 to 4 upshift and lock up should take place, and shift points should match those shown
in the shift speed chart.
• Also check to see that downshift is made from 4 to 3, 3 to 2 and 2 to 1 point is within the limits shown
in the shift speed chart.
2. 3 range road test in normal and power drive mode. • Select into the 3 range and hold the accelerator pedal constant at the 50% and 100% accelerator
pedal position.
• 1 to 2, 2 to 3 upshift and lock up should take place, and shift points should match those shown in the
shift speed chart.
• While running in the 3 range, does not upshift from 3 to 4.
3. 2 range road test in normal mode. • Select into the 2 range and hold the accelerator
pedal constant at the 50% and 100% accelerator
pedal position.
• 1 to 2 upshift should take place, and shift points should match those shown in the shift speed chart.
• While running in the 2 range, does not upshift from 2 to 3 or 3 to 4, and lock-up does not operate.
4. L range road test in normal mode.
• While running in the L range, does not upshift from 1 to 2, 2 to 3 or 3 to 4, and lock-up does not
operate.
5. R range road test. • Select into the R range and check for slipping.
6. P range road test. • Stop the vehicle on a grade and release the park brake after selecting into the P range. Then check
to see that the parking lock pawl holds the vehicle
in place.
Diagnosis 1. If there is no 1 to 2 upshift.• Faulty operation of 2-4 brake
• Faulty operation of 2-4 brake hydraulic circuits
• Sticking of 2-4 brake solenoid valve
• Refer to symptom diagnosis No. D1: Faulty Gear Shifting or DTC P0731 - P0734 Incorrect Gear
Ratio diagnosis.
2. If there is no 2 to 3 upshift.
• Faulty operation of high clutch
• Faulty operation of high clutch hydraulic circuits
• Sticking of high clutch solenoid valve
• Refer to symptom diagnosis No. D1: Faulty Gear Shifting or DTC P0731 - P0734 Incorrect Gear
Ratio diagnosis.
3. If there is no 3 to 4 upshift.
• Faulty operation of 2-4 brake
• Faulty operation of 2-4 brake hydraulic circuits
• Sticking of 2-4 brake solenoid valve
• Refer to symptom diagnosis No. D1: Faulty Gear Shifting or DTC P0731 - P0734 Incorrect Gear
Ratio diagnosis.
4. If there is no lock up in 2nd, 3rd and 4th. • Faulty operation of torque converter clutch (TCC) piston
• Faulty operation of lock up hydraulic circuit
• Sticking of TCC solenoid valve
• Refer to symptom diagnosis No. I1: No Lock-up
5. If there is no reverse. • Faulty operation of reverse clutch
• Faulty operation of reverse clutch hydraulic circuits
• Faulty operation of low & reverse brake hydraulic circuits
Selector lever
position GearshiftSelected gear
position
P
R
N
D
3
2
L 1st
2nd 3rd4th1st
2nd 3rd
4th(*1) 1st
2nd
3rd(*1) 4th(*1) 1st
2nd(*1) 3rd(*1)4th(*1)
Reverse

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ISUZU KB P190 2007

7A2-126 TRANSMISSION CONTROL SYSTEM (JR405E)
• Sticking of low & reverse brake solenoid valve
• Refer to symptom diagnosis No. A2: Vehicle Dose Not Run in R Range
6. If there is no parking. • Faulty parking pawl
• Refer to symptom diagnosis No. G1: Vehicle Moves in P Range or Parking Gear in Not
Disengaged other than P Range.
Notice: The check for the cause of abnormal noise and
vibration must be made with extreme care as it could
also be due to loss of balance in the propeller shaft,
differential, the torque converter, etc. Or insufficient
bending, rigidity, etc. in the powertrain.
Shift Speed Chart 1. All upshifts have a solid green line with:• 1-2 has black filled diamond plot points
• 2-3 has black filled squre plot points
• 2-4 has back filled circular plot posints
2. All donwshift have a sloid blue line with:
• 2-1 has white filled diamonf plot points
• 3-2 has white filled squre plot points
• 4-3 has white filled circular plot points
3. Torque converter clutch apply points have a dashed orange line with:
• 2nd apply has black filled diamond plot points
• 3rd apply has black filled squre plot points
• 4th apply has black filled circulat plot points
4. Torque converter clutch release points have a dashed pink line with:
• 2nd release has white filled diamond plot points
• 3rd release has white filled squre plot points
• 4th release has white filled circulat plot points

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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-143
Description and Operation
Transmission Identification Information
Legend1. Drive train type (UK020= 2WD/ UK021= 4WD)
2. Production calendar year (6=2006/ 7= 2007/ 8= 2008) 3. Production month (1 - 9= January - September/ X=
October/ Y= November/ Z= December)
4. Sequential number
Transmission General Description
Legend
1. Torque converter housing
2. Torque converter
3. High clutch
4. Reverse clutch
5. 2-4 brake
6. Low clutch
7. Low & reverse brake 8. Output shaft
9. Extension housing
10. Input shaft 11 . O i l p u m p
12. Valve body
13. Low one-way clutch
14. Parking gear
JATCO CORP
UK02
No. 6X80652 1
2 3 4
4WD
2WD

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7A2-152 TRANSMISSION CONTROL SYSTEM (JR405E)
Output Shaft Speed (OSS) Sensor
Legend1. OSS sensor
2. Parking gear
The output shaft speed (OSS) sensor is located on
right-hand of the transmission case near the
transmission range switch. The OSS sensor is a hall
effect element type sensor, which generates a square
wave signal pulse based on the parking gear rotational
speed that is connected to output shaft (16 pulses per a
rotation of the parking gear that is fitted with the output
shaft by spline). The TCM calculates the vehicle speed
by the OSS sensor signal, and uses it to determine
appropriate shift points and calculate gear ratio. The
2WD vehicle outputs the vehicle speed signal from the
TCM to the engine control module (ECM) and the
vehicle speed meter via output signal line.
Transmission Control System Description
Transmission Control Module (TCM) Service
Precautions
Important:
To avoid shock and possible serious injury, DO NOT
touch the terminals. When disconnecting the harness
connectors, always turn OFF the ignition switch or
disconnect the battery cable.
The transmission control module (TCM) is designed to
withstand normal current draws associated with vehicle
operation. Avoid overloading any circuit. When testing
for opens and shorts, do not ground or apply voltage to
any of the TCM circuits unless instructed to do so. In
some cases, these circuits should only be tested using
a DMM. The TCM should remain connected to the TCM
harness. The TCM is located next to brake pedal via
mounting bracket. The TCM mainly controls the
gearshift system control and on-board diagnostic for
transmission control. The TCM constantly observes the
information from various sensors. The TCM controls
the systems that affect vehicle performance. The TCM
performs the diagnostic function of the system. The
TCM can recognize operational problems, alert the
driver through the check trans lamp, and store
diagnostic trouble codes (DTCs). DTCs identify the
system faults to aid the technician in making repairs.
1
2

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TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-161
Transmission Power Flow Description
Legend1. Input shaft
2. Front planetary carrier
3. Front pinion gear
4. Front sun gear
5. Rear sun gear
6. Rear pinion gear
7. Rear internal gear
8. Output shaft
9. Reverse clutch 10. 2-4 brake
11. High clutch
12. Front internal gear
13. Rear planetary carrier
14. Low clutch
15. Low & reverse brake
16. Low one-way clutch
17. Parking pawl
Construction Parts
The JR405E consists of two sets of planetary gears,
three multiple plate clutches, two multiple plate brakes
and one one-way clutch.
High Clutch
High clutch (11) connects the input shaft (1) to the front
planetary carrier (2). It is engaged at 3rd and 4th gear.
Low Clutch
Low clutch (14) connects the front planetary carrier (2)
to the rear internal gear (7). It is engaged at 1st, 2nd
and 3rd gear.
Reverse Clutch
Reverse clutch (9) connects the input shaft (1) to the
front sun gear (4). It is engaged at reverse gear.
Low One-way Clutch
Low one-way clutch (16) allows the front planetary
carrier (2) to turn forward (clockwise) but locks to
opposite direction (counterclockwise). It is operative
when accelerating.
Low & Reverse Brake
Low & reverse brake (15) locks the front planetary
carrier (2). It is engaged in L range and reverse gear. 2-4 Brake
2-4 brake (10) locks the front sun gear (4). It is
engaged at 2nd and 4th (O/D) gear.

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7A2-162 TRANSMISSION CONTROL SYSTEM (JR405E)
Parking
Legend1. Input shaft
2. Front planetary carrier
3. Front pinion gear
4. Front sun gear
5. Rear sun gear
6. Rear pinion gear
7. Rear internal gear
8. Output shaft
9. Reverse clutch 10. 2-4 brake
11 . H i g h c l u t c h
12. Front internal gear
13. Rear planetary carrier
14. Low clutch
15. Low & reverse brake
16. Low one-way clutch
17. Parking pawl
Although the driving force of the input shaft (1) is
transmitted to the rear sun gear (5) and reverse & high
clutch drum, the driving force is not transmitted to the
output shaft (8) since all of the clutches and brakes are
not engaged. Therefore, the vehicle can move in this
condition. However, since the output shaft (8) is
mechanically locked with the parking pawl (17), the rear
planetary carrier (13) and front internal gear (12) are
locked. For this reason, the vehicle does not move.

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TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-163
Neutral
Legend1. Input shaft
2. Front planetary carrier
3. Front pinion gear
4. Front sun gear
5. Rear sun gear
6. Rear pinion gear
7. Rear internal gear
8. Output shaft
9. Reverse clutch 10. 2-4 brake
11. High clutch
12. Front internal gear
13. Rear planetary carrier
14. Low clutch
15. Low & reverse brake
16. Low one-way clutch
17. Parking pawl
Although the driving force of the input shaft (1) is
transmitted to the rear sun gear (5) and reverse & high
clutch drum, the driving force is not transmitted to the
output shaft (8) since all of the clutches and brakes are
not engaged. Therefore, the vehicle can move in this
condition.

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ISUZU KB P190 2007