Isuzu KB P190. Manual — part 1099
7A2-112 TRANSMISSION CONTROL SYSTEM (JR405E)
D3: Gearshift Point is Low or High at All Points
D4: Gearshift Point is Low or High at Limited Area
D5: No Kick-down
E1: No Gearshift
Checks
Action
Definition:
• Gearshift point is deviated from the shift speed chart.
• Gear is not shifted up properly, even though the vehicle is accelerating.
• Gear is not shifted immediately and enough acceleration cannot be obtained, even though the accelerator pedal is being
stepped on.
Diagnosis Hints
• Inspect the output shaft speed (OSS) sensor for faulty operation.
• Incorrect accelerator pedal position signal is suspected. Observe the
Accelerator Pedal Position (APP). APP parameter should change linearly
from 0 to 99 or 100% according to the accelerator pedal operation.
Checks
Action
Definition:
The engine speeds up but the vehicle speed does not increase when the accelerator pedal is being stepped on at starting.
Diagnosis
Hints
Incorrect accelerator pedal position signal is suspected. Observe the
Accelerator Pedal Position (APP). APP parameter should change linearly from
0 to 99 or 100% according to the accelerator pedal operation.
Checks
Action
Definition:
• Gear is fixed, such as no gearshift from 1st to 2nd, 2nd to 3rd, and 3rd to 4th.
• Sometimes the gear is shifted, and sometimes it is not possible.
Diagnosis Hints
• Fixing at same gear speed, a signal error from the accelerator pedal
position (APP) sensor or trouble in the transmission main unit are
suspected.
• Slipping of the clutch is suspected. Gear ratio error DTC might be set.
Transmission Range Switch & Selector Lever
Cable Checks
Inspect the transmission range switch and selector lever cable for misadjusting
or disordering. Refer to On-Vehicle Service section.
Transmission Fluid Checks
Inspect the transmission fluid for the following conditions. If the transmission
fluid is extremely blacked, contaminated or smells burnt, slipping of clutch is
suspected.
• Low quantity
• Contamination
• Smell
Line Pressure Checks
Inspect the line pressure in forward ranges for a possible dropped pressure.
Refer to Line Pressure Test in Test Instruction section.
Stall Speed Checks
Inspect the stall speed in forward ranges. Refer to Stall Test in Test Instruction
section.
Control Valve Body Checks
Inspect the valve body for the following conditions.
• Faulty operation
• Sticking spool valve
• Sticking shift solenoid valve. Perform function check. Refer to On-Vehicle
Service section.
• Clogged hydraulic circuit
Clutch and Brake Checks
Inspect the low clutch, high clutch or low & reverse brake for slipping.
TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-113
E2: Only 4th Gear is Not Selectable
E3: Gear is Changed from 2nd to 3rd in 2 Range
E4: Gear is Changed from 1st to 2nd in L Range
E5: Gear is Changed from 3rd to 4th in 3 Range
Sensor Checks
Inspect the input shaft speed (ISS) sensor and output shaft speed (OSS)
sensor for faulty operation.
Additional Checks
• Inspect the TCM grounds for being clean, tight, and in their proper
locations.
• Observe the Accelerator Pedal Position (APP). APP parameter should
change linearly from 0 to 99 or 100% according to the accelerator pedal
operation.
Checks
Action
Checks
Action
Definition:
Gearshift is not possible from 3rd to 4th even though the vehicle is accelerating.
Diagnosis Hints
When the transmission fluid temperature is lower than 10
°C (50°F), gearshift
from the 3rd to the 4th is inhibited.
Transmission Range Switch & Selector Lever
Cable Checks
Inspect the transmission range switch and selector lever cable for misadjusting
or disordering. Refer to On-Vehicle Service section.
Transmission Fluid Checks
Inspect the transmission fluid for the following conditions. If the transmission
fluid is extremely blacked, contaminated or smells burnt, slipping of clutch is
suspected.
• Low quantity
• Contamination
• Smell
Line Pressure Checks
Inspect the line pressure in forward ranges for a possible dropped pressure.
Refer to Line Pressure Test in Test Instruction section.
Stall Speed Checks
Inspect the stall speed in forward ranges. Refer to Stall Test in Test Instruction
section.
Control Valve Body Checks
Inspect the valve body for the following conditions.
• Faulty operation
• Sticking spool valve
• Sticking shift solenoid valve. Perform function check. Refer to On-Vehicle
Service section.
• Clogged hydraulic circuit
Clutch and Brake Checks
Inspect the low clutch for seizing.
Sensor Checks
Inspect the transmission fluid temperature (TFT) sensor. Use the Temperature
vs. Resistance table to test the TFT sensor at various temperature levels to
evaluate the possibility of a skewed sensor.
Checks
Action
Definition:
• Gear is shifted from 2nd to 3rd in 2 range.
• Gear is shifted from 1st to 2nd in L range.
• Gear is shifted from 3rd to 4th in 3 range.
Transmission Range Switch & Selector Lever
Cable Checks
Inspect the transmission range switch and selector lever cable for misadjusting
or disordering. Refer to On-Vehicle Service section.
7A2-114 TRANSMISSION CONTROL SYSTEM (JR405E)
F1: Low Maximum Speed or Poor Acceleration
F2: Engine Race Up (Slipping) During Acceleration
Control Valve Body Checks
Inspect the valve body for the following conditions.
• Faulty operation
• Sticking spool valve
• Sticking shift solenoid valve. Perform function check. Refer to On-Vehicle
Service section.
• Clogged hydraulic circuit
Checks
Action
Checks
Action
Definition:
• Starting acceleration is poor.
• Acceleration is slow, even though the accelerator pedal is stepped on during the running.
Diagnosis Hints
In addition to the low engine output, faulty gearshift of the transmission or
fixing at the 3rd gear in the fail-safe operation may also be possible.
Therefore, if “maximum speed is low, and acceleration is poor”, it should be
cleared up whether the trouble originates from the engine system or
transmission control system by a running test, inspection of stall speed, etc.
Transmission Range Switch & Selector Lever
Cable Checks
Inspect the transmission range switch and selector lever cable for
misadjusting or disordering. Refer to On-Vehicle Service section.
Transmission Fluid Checks
Inspect the transmission fluid for the following conditions. If the transmission
fluid is extremely blacked, contaminated or smells burnt, slipping of clutch is
suspected.
• Low quantity
• Contamination
• Smell
Line Pressure Checks
Inspect the line pressure in forward ranges for a possible dropped pressure.
Refer to Line Pressure Test in Test Instruction section.
Stall Speed Checks
Inspect the stall speed in forward ranges. Refer to Stall Test in Test Instruction
section.
Control Valve Body Checks
Inspect the valve body for the following conditions.
• Faulty operation
• Sticking spool valve
• Sticking shift solenoid valve. Perform function check. Refer to On-Vehicle
Service section.
• Clogged hydraulic circuit
Torque Converter Checks
Inspect the torque converter for faulty operation.
Clutch and Brake Checks
Inspect the low clutch and high clutch for slipping.
Additional Checks
• Inspect the engine for proper outputs. Refer to appropriate inspection
chart in engine section.
• Inspect the TCM grounds for being clean, tight, and in their proper
locations.
• Observe the Accelerator Pedal Position (APP). APP parameter should
change linearly from 0 to 99 or 100% according to the accelerator pedal
operation.
Checks
Action
Definition:
• Engine speed increases but the vehicle speed does not increase when the accelerator pedal is being stepped on.
TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-115
F3: Noise or Vibration Occurs During in R, D, 3, 2 or L Range
F4: Engine Brake Does Not Apply in L Range
F5: Engine Stalls Before Vehicle Stops from Running
G1: Vehicle Moves in P Range or Parking is Not Disengaged in Other Than P Range
Diagnosis Hints
The same causes as in category No. “C1 - C8: Engine Race Up (Slipping)”
are suspected. When the condition of No. C1 - C8 grows worse, No. F2
results.
Checks
Action
Definition:
Noise or vibration occurs in the vicinity of the transmission during running.
Diagnosis
Hints
Cause other than transmission is suspected. Reproduce the running
condition using a lift up, chassis dynamo, etc. to investigate the origin of the
noise and vibration.
Additional Checks
• Inspect the differential gear noise.
• Inspect the propeller shaft noise.
• Inspect the tires for unbalanced or poor uniformity.
Checks
Action
Checks
Action
Definition:
The engine brake does not apply, allowing the vehicle to run freely when the accelerator pedal is released at low speed in L
range.
Diagnosis Hints
• Slipping of the clutch is suspected. Gear ratio error DTC might be set.
Line Pressure Checks
Inspect the line pressure in forward ranges for a possible dropped pressure.
Refer to Line Pressure Test in Test Instruction section.
Control Valve Body Checks
Inspect the valve body for the following conditions.
• Faulty operation
• Sticking spool valve
• Sticking shift solenoid valve. Perform function check. Refer to On-
Vehicle Service section.
• Clogged hydraulic circuit
Clutch and Brake Checks
Inspect the low & reverse brake for slipping.
Sensor Checks
Inspect the input shaft speed (ISS) sensor and output shaft speed (OSS)
sensor for faulty operation.
Checks
Action
Definition:
The engine stalls simultaneously with the vehicle when the brake pedal is stepped on to stop the vehicle during running.
Diagnosis Hints
The same causes as in category No. “B5: Engine Stalls When Selector Lever
is Changed from N to R, D, 3, 2 or L Range” is suspected.
Checks
Action
Definition:
Vehicle moves even though it stops on a slope and P range is selected.
Vehicle does not move even though a position other than P range is selected, and the accelerator pedal is being stepped on.
Diagnosis Hints
If the vehicle moves in N range, refer to category No. “B1: Vehicle Runs in
N Range”.
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