brake light ISUZU TF SERIES 2004 Owner's Guide
Page 4085 of 4264
DIAGNOSIS (JR405E) 7A2-93
No. A1: Vehicle Does Not Run in D, 3, 2, L and R Range
Description:
Vehicle does not run though the accelerator pedal is stepped on.
Diagnosis Hints:
Some trouble in the AT main unit is supposed (since the vehicle can run even if the TCM is defective). However,
since the trouble of the main unit may be originated from the sensor system or output system, these systems
should be also checked to prevent reproduce of the trouble.
Possible Cause:
Slip of clutch (low clutch, low one-way clutch, reverse clutch, low & reverse brake).
If slip of clutch is caused, a DTC (gear ratio error) is stored.
Shortage or faulty quality of ATF.
Dropped line pressure.
Trouble in control valve body (faulty operation, sticking, clogged oil passage).
Disordered select cable (select indicator light indicates D, 3, 2, L or R but the hydraulic system is not in the D, 3,
2, L, or R range).
Faulty torque generated.
Trouble in the torque converter (faulty operation, sticking), insufficient engine output.
Malfunction of parking mechanism.
Step Action Yes No
1 Dislocation or disordered of select lever.
Does the vehicle move when the brake is released in a
position other than the P range and the vehicle is pushed?
Go to Step 2
Adjust the select cable.
2 Are any DTCs stored?
Go to DTC Chart Go to Step 3
3 Are the quantity, contamination and smell normal?
If the ATF level is low,
replenish up to the
specified level.
Go to Step 4
If ATF is extremely
black and
contaminated and
smells burnt, slip of the
clutch is supposed.
Overhaul the AT unit.
4 Is the stall revolution correct in all range? Refer the STALL
TEST section in this manual.
Go to Step 5
Repair the defect or
replace.
5 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.
Page 4086 of 4264
7A2-94 DIAGNOSIS (JR405E)
No. A2: Vehicle Does Not Run in R Range
Description:
Vehicle does not run in R range only.
It runs correctly in D, 3, 2, and L ranges.
Diagnosis Hints:
Some trouble in the AT main unit is supposed (since the vehicle can run even if the TCM is defective). However,
since the trouble of the main unit may be originated from the sensor system or output system, these systems
should be also checked to prevent reproduce of the trouble.
Possible Cause:
Slip of clutch (reverse clutch, low & reverse brake).
If slip of clutch is caused, a DTC (gear ratio error) is stored.
Shortage or faulty quality of ATF.
Dropped line pressure.
Trouble in control valve body (faulty operation, sticking, clogged oil passage).
Disordered select cable (select indicator light indicates R but the hydraulic system is not in the R range).
Faulty torque generated.
Trouble in the torque converter (faulty operation, sticking), insufficient engine output.
Malfunction of parking mechanism.
Step Action Yes No
1 Dislocation or disordered of select lever.
Does the vehicle move when the brake is released in a
position other than the P range and the vehicle is pushed?
Go to Step 2
Adjust the select cable.
2 Are any DTCs stored?
Go to DTC Chart Go to Step 3
3 Are the quantity, contamination and smell normal?
If the ATF level is low,
replenish up to the
specified level.
Go to Step 4
If ATF is extremely
black and
contaminated and
smells burnt, slip of the
clutch is supposed.
Overhaul the AT unit.
4 Is the stall revolution correct in R range? Refer the STALL
TEST section in this manual.
Go to Step 5
Repair the defect or
replace.
5 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.
Page 4087 of 4264
DIAGNOSIS (JR405E) 7A2-95
No. A3: Vehicle Does Not Run in D, 3, 2 and L Range
Description:
Vehicle does not run in D, 3, 2 and L range only.
It runs correctly in R ranges.
Diagnosis Hints:
Some trouble in the AT main unit is supposed (since the vehicle can run even if the TCM is defective). However,
since the trouble of the main unit may be originated from the sensor system or output system, these systems
should be also checked to prevent reproduce of the trouble.
Possible Cause:
Slip of clutch (low clutch and low one-way clutch).
If slip of clutch is caused, a DTC (gear ratio error) is stored.
Shortage or faulty quality of ATF.
Dropped line pressure.
Trouble in control valve body (faulty operation, sticking, clogged oil passage).
Disordered select cable (select indicator light indicates D, 3, 2 and L but the hydraulic system is not in the D, 3, 2
and L range).
Faulty torque generated.
Trouble in the torque converter (faulty operation, sticking), insufficient engine output.
Malfunction of parking mechanism.
Step Action Yes No
1 Dislocation or disordered of select lever.
Does the vehicle move when the brake is released in a
position other than the P range and the vehicle is pushed?
Go to Step 2
Adjust the select cable.
2 Are any DTCs stored?
Go to DTC Chart Go to Step 3
3 Are the quantity, contamination and smell normal?
If the ATF level is low,
replenish up to the
specified level.
Go to Step 4
If ATF is extremely
black and
contaminated and
smells burnt, slip of the
clutch is supposed.
Overhaul the AT unit.
4 Is the stall revolution correct in D, 3, 2 and L range? Refer
the STALL TEST section in this manual.
Go to Step 5
Repair the defect or
replace.
5 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.
Page 4088 of 4264
7A2-96 DIAGNOSIS (JR405E)
No. B1: Vehicle Runs in N Range
Description:
Creep appears in N range.
Vehicle moves unless the brake pedal is stepped on in N range.
Diagnosis Hints:
Basically a trouble in the AT main unit. However, some trouble in the sensor system or output system may have
some influence on the trouble in the main unit and therefore these systems should be also checked to prevent
reproduce of the trouble.
Possible Cause:
Seized clutch (low clutch, low one-way clutch, reverse clutch, low & reverse brake).
Trouble in the control valve (faulty operation, sticking, clogged oil passage).
Dislocated select lever (the select indicator light indicates the N range but the hydraulic system is in the D, 3, 2
or L range).
Step Action Yes No
1 Dislocation or disordered of select lever.
Does the vehicle move when the brake is released in a
position other than the P range and the vehicle is pushed?
Go to Step 2
Adjust the select cable.
2 Are any DTCs stored?
Go to DTC Chart Go to Step 3
3 Are the quantity, contamination and smell normal?
If the ATF level is low,
replenish up to the
specified level.
Trouble in the AT
assembly or control
valve.
If ATF is extremely
black and
contaminated and
smells burnt, slip of the
clutch is supposed.
Overhaul the AT unit.
Page 4099 of 4264
DIAGNOSIS (JR405E) 7A2-107
No. B10: Brake is Applied in R Range
Description:
Brake is applied suddenly in R range.
Diagnosis Hints:
Basically a trouble in the AT main unit. However, some trouble in the sensor system or output system may have
some influence on the trouble in the main unit and therefore these systems should be also checked to prevent
reproduce of the trouble.
Possible Cause:
Seized clutch (low clutch, high clutch, 2-4 brake).
Shortage or faulty quality of ATF.
Trouble in control valve body (faulty operation, sticking, clogged oil passage).
Disordered select cable (select indicator light indicates R but the hydraulic system is not in the R range).
Malfunction of parking mechanism.
No. B11: Insufficient Starting or Shaking in D Range
Description:
Insufficient starting or shaking in D range.
Possible Cause:
Slip of clutch (low clutch, low one-way clutch, reverse clutch, low & reverse brake).
If slip of clutch is caused, a DTC (gear ratio error) is stored.
Shortage or faulty quality of ATF.
Dropped line pressure.
Trouble in control valve body (faulty operation, sticking, clogged oil passage).
No. B12: Noise or Vibration is Generated at Starting
Description:
Noise or vibration is generated in the vicinity of AT at starting.
Diagnosis Hints:
Cause other than AT can be also considered. It is effective means to reproduce a running condition using a lift
up, chassis dynamo, etc. to investigate the origin (generating condition) of noise and vibration.
Caution:
Lifting up some unit to test it accompanies danger. Provide safety measures as far as possible and
carry out the test with sufficient care.
Possible Cause:
Following sources of noise or vibration other than the AT can be considered.
Noise from differential gears.
Noise from propeller shaft.
The bearing support in the middle of the propeller shaft has fatigued, and the bend angle of the propeller shaft
has changed, causing vibration at the time of start.
Unbalanced and poor uniformity of tires cause vibration.