7A2-104 DIAGNOSIS (JR405E)
No. B5: Engine Stalls When Selecting From N Range to
R, D, 3, 2 or L Range
Description:
The engine stalls when selecting from N or P range to a run range during the engine idling.
Diagnosis Hints:
As causes attributable to the engine, faulty idle up, insufficient engine output, etc. are considered.
As a cause of the AT system, faulty lockup piston system (lockup engine stall) is considered.
If the oil through resistance increases remarkably due to clogged oil cooler or some other reason, or if the ATF
level decreases, the lock-up piston works causing the engine stall.
Possible Cause:
Disordered idling speed, faulty idle up, faulty engine output, shortage output.
Insufficient ATF quantity (dropped level).
Clogged oil cooler (foreign substance mixed in).
Faulty lock-up piston (clogged oil passage of solenoid drive circuit, faulty operation).
Step Action Yes No
1 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 2 Go to Step 2
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 Check of engine idle up speed
Does the idle speed increase when the air conditioning or other
electric load is turned on?
Go to Step 5
Repair the defect or
replace.
