Page 465 of 2389
5. P RANGE TEST
Stop the vehicle on a gradient (more than 51 and after
shifting into the P range, release the parking brake.
Then check to see that the parking lock pawl holds the
vehicle in place.(b) While running in the L range, release the acceler-
ator pedal and check the engine braking effect.
EVALUATION
If there is no engine braking effect:
wFirst and reverse brake is defective 3. L RANGE. TEST
(a) While running in the L range, check to see that there
is no up±shift to 2nd gear.
4. R RANGE TEST
Shift into the R range and, while starting at full throttle,
check for slipping.(c) Check for abnormal noise during acceleration and
deceleration.
± AUTOMATIC TRANSAXLETroubleshooting (Mechanical System Tests) (A540E and
A540H)AT±229
Page 466 of 2389
*: O/D switch OFF
HINT:
(1) Lock±up will not occur in 2nd gear unless the throttle valve opening is greater than 50%.
(2) There is no lock±up in the 2 and L ranges.
(3) In the following cases, the lock±up will be released regardless of the lock±up pattern.
wWhen the throttle is completely closed.
wWhen the brake light switch is ON.
(4) When the coolant. temp. is below 140
°F (60°C) (A540E) or 122°F (50°C) (A540H), the shift point is lower
than specified vehicle speed.
Automatic Shift Schedule
(A540E)
Throttle valve opening 5%
Throttle valve opening 5%Throttle valve fully open
Throttle valve fully open
*: O/D switch
OFF
(A540H)
Lock±up ON[fully closed]
Lock±up OFFkm/h (mph) Lock±up OFFkm/h (mph)
[fully closed]
km/h (mph)
Lock±up ONkm/h (mph) NORM
PWR NORM
PWR
NORM
PWRNORM
PWR
D range D range
D range
2 range
D range
2 range
L range
L rangeNORM
NORM NORM
NORM
PWR PWR PWR
PWR
± AUTOMATIC TRANSAXLETroubleshooting (Automatic Shift Schedule) (A540E and
A540H)AT±230
Page 467 of 2389
Electronic Control System
ELECTRONIC CONTROL CIRCUIT (A540E)
± AUTOMATIC TRANSAXLETroubleshooting (Electronic Control System) (A540E and
A540H)AT±203
Page 468 of 2389
ELECTRONIC CONTROL CIRCUIT (A540H)
± AUTOMATIC TRANSAXLETroubleshooting (Electronic Control System) (A540E and
A540H)AT±204
Page 469 of 2389
ELECTRONIC CONTROL COMPONENTS (A540E)
± AUTOMATIC TRANSAXLETroubleshooting (Electronic Control System) (A540E and
A540H)AT±205
Page 470 of 2389
ELECTRONIC CONTROL COMPONENTS (A540H)
± AUTOMATIC TRANSAXLETroubleshooting (Electronic Control System) (A540E and
A540H)AT±206
Page 471 of 2389

Disconnect solenoid wire connector and road test.
Does the transaxle operate in the respective gear
when in the following ranges while driving?
D range .... Overdrive
2 range .... Overdrive
L range .... 1 st gear
TROUBLESHOOTING FLOW±CHART (A540E)
Trouble No. 1 No Shifting
Is voltage between Engine and ECT ECU
terminals BK and E1 as follows?
0V: Brake pedal released
10 ± 14V: Brake pedal depressed
Connect solenoid wire connector and road test.
Does Tt terminal voltage rise from 0V to
7V in sequence?Warm up engine
Coolant temp.: 176°F (80°C)
ATF temp.: 122 ± 176°F (50 ± 80°C)
Connect a voltmeter to terminals Tt and E1.
Does Tt terminal voltage vary with changes in
throttle opening? (See page AT±215)
wECU power source and ground faulty
wThrottle position signal faulty
wTt terminal wire open or short
Are there 10 ± 14V between
Engine and ECT ECU terminals 2 ± E
when in the D range?
Are there 10 ± 14V between Engine and ECT
ECU terminals L ± Ex when in the D range?
wNeutral start switch circuit faulty
wNeutral start switch faultyProceed to trouble No. 3
(See page AT±209)
Try another Engine and ECT ECUw Transaxle faulty
wSolenoid faultyBrake signal faulty
Transaxle faulty
Ye s
Ye s
Ye s
Ye s Ye s
± AUTOMATIC TRANSAXLETroubleshooting (Electronic Control System) (A540E and
A540H)AT±207
Page 472 of 2389
Check voltage between Engine and ECT ECU
terminals PWR and E1.
Power pattern: 10 ± 14V
Normal pattern: 1VIs voltage between Engine and ECT ECU
terminals BK and E1 as follows?
0V: Brake pedal released
1V: Brake pedal depressed Warm up engine
Coolant temp.: 176°F (80°C)
ATF temp.: 122 ± 176°F (50 ± 80°C)
Connect a voltmeter to terminals Tt and El.
Does Tt terminal voltage vary with changes in
throttle opening? (See page AT±215)
ECU power source and ground faulty
Throttle position signal faulty
Tt terminal wire open or short
Faulty Engine and ECT ECU
Faulty transaxle
Shift point too high or too Low
Faulty pattern select switch systemBrake signal
faulty
Trouble No. 2
Ye s Ye s
± AUTOMATIC TRANSAXLETroubleshooting (Electronic Control System) (A540E and
A540H)AT±208