Specifications

AUTOMATIC TRANSMISSION -
Troubleshooting
23-31
INSPECTION PROCEDURE 8
Shocks when changing from N to R and large time lag
Probable cause
If abnormal shocks or a time lag of 2 seconds or more occurs when the selector
lever is shifted from N to R range while the engine is idling, the cause is probably
abnormal reverse clutch pressure or low and reverse brake pressure, or a malfunction
of the reverse clutch, low and reverse brake, valve body or idle position switch.
D Abnormal reverse clutch pressure
D Abnormal low and reverse brake pressure
D Malfunction of the low and reverse solenoid valve
D Malfunction of the reverse clutch
D Malfunction of the low and reverse brake
D Malfunction of the valve body
D Malfunction of the idle position switch
L
: Refer to the Transmission Workshop Manual.
MUT-
II
Actuator test
D No. 1 Low and reverse solenoid valve
OK:
Sound of operation can be heard.
NG
Replace the low and reverse solenoid valve. L
OK
When does the shock occur?
When starting
Shocks sometimes occur
No Yes
MUT-
II
Data list
D No. 64 Idle position switch
OK:
Turns from on to off when the accelerator pedal is slightly
depressed from the fully closed position.
OK NG
Idle position switch check
D INSPECTION PROCEDURE 18 - Idle position switch system
check (Refer to P.23-37.)
Valve body disassembly, cleaning and reassembly L
D Pay particular attention to loosening of bolts, and to damage
and slippage of O-rings, valves and valve bodies.
D If the damage cannot be repaired, replace the valve body
assembly.
When shifting
Hydraulic pressure test (Refer to P.23-56.)
D Measure the reverse clutch pressure in R range.
Standard value:
Refer to P.23-57.
NG
OK
Hydraulic pressure test (Refer to P.23-56.)
D Measure the low a nd reverse brake pressure in R range.
Standard value:
Refer to P.23-57.
NG
OK
Reverse clutch system and low reverse brake system check L
D Remove the transmission assembly, valve body cover and valve
body.
D Pistons should operate and pressure should be maintained
when air is blown through the reverse clutch oil hole and low
and reverse brake oil hole in the transmission case.
OK
NG
Reverse clutch and low reverse brake check L
D Check for burning of the facing, defective piston seal rings
and interference at the retainer.