1986 TOYOTA CAMRY V20 air condition

VACUUM SWITCHING VALVE (VSV)
(See pages AC±4 to AC±7)
INSPECTION OF VSV
1. REMOVE VSV
2. CHECK VACUUM CIRCUIT CONTINUITY IN VSV 8*
BLOWING AIR INTO PIPE
(a) Connect the VSV terminals to the battery terminals
as shown.
(b) Blow into pipe ºAº, and check that air comes out of
pipe ºBº but does not come out of filter ºCº.
4. CHECK FOR OPEN CIRCUIT
Using an ohmmeter, measure the resistance between the
two terminals of the VSV.
Specified resistance: 37 ± 44

at 20°C (68°F)
If resistance value is not as specified, replace the VSV. 3. CHECK FOR SHORT CIRCUIT
Using an ohmmeter, check that there is no continuity be-
tween each terminal and the VSV body.
If a short circuit is found, repair or replace the VSV.(c) Disconnect the battery.
(d) Blow into pipe ºAº and check that air comes out
of filter ºCº but does not come out of pipe ºBº.
If a problem is found, replace the VSV.
± AIR CONDITIONING SYSTEMVacuum Switching Valve (VSV)AC±48

2. INSPECT SOLENOID
(a) Disconnect the connector from the ECT computer.
(b) Measure the resistance between S1, S2, SL and
ground.
Resistance: 11 ± 15


(c) Apply battery voltage to the solenoid. Check that an
operation noise can be heard from the solenoid.
HINT: If there is foreign matter in the solenoid valve,
there will be no fluid control even with solenoid opera-
tion.
3. CHECK SOLENOID SEALS
If there is foreign material in the solenoid valve, there
will be no fluid control even with solenoid operation.
(a) Check No. 1 and No. 2 solenoid valves.
wApplying 5 kg/cm2 (71 psi, 490 kPa) or compressed
air, check that the solenoid valves do not leak the air.
wWhen supply battery voltage to the solenoids,
check that the solenoid valves open.
(b) Check the lock±up solenoid valve.
wApplying 5 kglcm2 (71 psi, 490 kPa) of com-
pressed air, check that the solenoid valve
opens.
wWhen supply battery voltage to the solenoid,
check that the solenoid valve does not leak the
air.
Coolant temp. above 122°F (50°C) Coolant temp. below 122°F (50°C)
O/D main switch turned OFF O/D main switch turned ONMeasuring condition
Ignition switch ON
Vehicle movingStanding still
PWR pattern
NORM patternVoltage (V)
Terminal
± AUTOMATIC TRANSAXLETroubleshooting (Electronic Control System) (A140E)AT±33

Mechanical System Tests
STALL TEST
The object of this test is to check the overall performance of the transaxle and engine by measur-
ing the stall speeds in the D and R ranges.
CAUTION:
wPerform the test at normal operation fluid temperature (122 ± 176°F or 50 ± 80°C).
wDo not continuously run this test longer than 5 seconds.
wTo ensure safety, conduct this test in a wide, clear, level area, which provides good traction.
wThe stall test should always be carried out in pairs. One should observe the conditions of wheels
or wheel stoppers outside the vehicle while the other is performing the test.
MEASURE STALL SPEED
(a) Chock the front and rear wheels.
(b) Connect a tachometer to the engine.
(c) Fully apply the parking brake.
(d) Step down strongly on the brake pedal with your left foot.
(e) Start the engine.
(f) Shift into the D range. Step all the way down on the accelerator pedal with your right foot. Quickly
read the stall speed at this time.
Stall speed: 2,200
+150 rpm
(g) Perform the same test in R range.
EVALUATION
(a) If the stall speed is the same for both ranges without the rear wheels rotating but lower than specified
value:
wEngine output may be insufficient
w Stator one±way clutch is not operating properly
(b) If the stall speed in D range is higher than specified:
wLine pressure too low
wForward clutch slipping
wNo. 2 one±way clutch not operating properly
wO/D one±way clutch not operating properly
(c) If the stall speed in R range is higher than specified:
wLine pressure too low
wDirect clutch slipping
wFirst and reverse brake slipping
wO/D one±way clutch not operating properly
(d) If the stall speed in both R and D ranges are higher than specified:
wLine pressure too low
wImproper fluid level
wO/D one±way clutch not operating properly
± AUTOMATIC TRANSAXLETroubleshooting (Mechanical System Tests) (A140L and
A140E)AT±38

HYDRAULIC TEST
PREPARATION
(a) Warm up the transaxle fluid.
(b) Remove the transaxle case test plug and connect the hydraulic pressure gauge.
SST 09992±00094 (Oil pressure gauge)
NOTICE:
wPerform the test at normal operating fluid temperature (122 ±176°F or 50 ± 80°C).
wThe line pressure test should always be carried out in pairs. One should observe the conditions
of wheels or wheel stoppers outside the vehicle while the other is performing the test.
MEASURE LINE PRESSURE
(a) Fully apply the parking brake and chock the four wheels.
(b) Start the engine and check idling rpm.
(e) Step down strongly on the brake pedal with your left foot and shift into D range.
(d) Measure the line pressure when the engine is idling.
(e) Press the accelerator pedal all the way down. Quickly read the highest line pressure when engine
speed reaches stall speed.
(f) In the same manner, perform the test in R range.
If the measured pressure are not up to specified values, recheck the throttle cable adjustment and
perform a retest.
kg/cm (psi, kPa)
Line pressure
R range D range
Idling
IdlingStall
Stall
± AUTOMATIC TRANSAXLETroubleshooting (Mechanical System Tests) (A140L and
A140E)AT±40

Mechanical System Tests
STALL TEST
The object of this test is to check the overall performance of the transaxle and engine by measuring
the stall speeds in the D and R ranges.
CAUTION:
wPerform the test at normal operation fluid temperature (122 ± 176°F or 50 ± 80°C).
wDo not continuously run this test longer than 5 seconds.
wTo ensure safety, conduct this test in a wide, clear, level area, which provides good traction.
wThe stall test should always be carried out in pairs. One should observe the conditions of wheels
or wheel stoppers outside the vehicle while the other is performing the test.
MEASURE STALL SPEED
(a) Chock the front and rear wheels.
(b) Connect a tachometer to the engine.
(c) Fully apply the parking brake.
(d) Step down strongly on the brake pedal with your left foot.
(e) Start the engine.
(f) Shift into the D range. Step all the way down on the accelerator pedal with your right foot. Quickly
read the stall speed at this time.
Stall speed: A540E (2VZ±FE) 2,450
+150 rpm
A540H (3S±FE) 2,320
+150 rpm
(g) Perform the same test in R range.
EVALUATION
(a) If the stall speed is the same for both ranges without the rear wheels rotating but lower than specified
value:
wEngine output may be insufficient
wStartor one±way clutch is not operating properly
(b) If the stall speed in D range is higher than specified:
wLine pressure too low
wForward clutch slipping
wNo. 2 one±way clutch not operating properly
wO/D one±way clutch not operating properly
(e) If the stall speed in R range is higher than specified:
wLine pressure too low
wDirect clutch slipping
wFirst and reverse brake slipping
wO/D one±way clutch not operating properly
(d) If the stall speed in both R and D ranges are higher than specified:
wLine pressure too low
wImproper fluid level
wO/D one±way clutch not operating properly
± AUTOMATIC TRANSAXLETroubleshooting (Mechanical System Tests) (A540E and
A540H)AT±222

HYDRAULIC TEST
PREPARATION
(a) Warm up the transaxle fluid.
(b) Remove the transaxle case test plug and connect the hydraulic pressure gauge.
SST 09992±00094 (Oil pressure gauge)
NOTICE:
wPerform the test at normal operating fluid temperature (122 ± 176°F or 50 ± 80°C)
wThe line pressure test should always be carried out in pairs. One should observe the conditions of
wheels or wheel stoppers outside the vehicle while the other is performing the test.
MEASURE LINE PRESSURE
(a) Fully apply the parking brake and chock the four wheels.
(b) Start the engine and check idling rpm.
(c) Step down strongly on the brake pedal with your left foot and shift into D range.
(d) Measure the line pressure when the engine is idling.
(e) Press the accelerator pedal all the way down. Quickly read the highest line pressure when engine
speed reaches stall speed.
(f) In the same manner, perform the test in R range.
(A540E)
kg/cm2 (psi, kPa)
Line pressure
D rangeR range
Idling
IdlingStallStall
± AUTOMATIC TRANSAXLETroubleshooting (Mechanical System Tests) (A540E and
A540H)AT±224

Maladjustment of brake pedal or booster push
rod
Poor return of brake booster or master cylinder or
wheel cylinder
(Disc brake)
Rusted or stuck piston
Improper positioning of pad in caliper
Rotor rubbing against caliper housing
Improper installation of disc brake pad support
plate
Pad wear and pad wear indicator making contact
with the rotor
(Drum brake)
Weak, damaged or incorrect shoe hold±down
springs
Grooved backing plate ledges
Bent or warped backing plate causing
interference with drum
Improper machining of drum causing interference
with backing plate or shoe
Other brake system components:
Loose or extra parts in brakes
Rear drum adjustment too tight causing lining to
glaze
Worn, damaged or insufficiently lubricated wheel
bearings Brake drums and linings, rotors and pads
worn or scored
Dirty, greased, contaminated or glazed
linings or pads
Improper linings or pads using
Maladjustment of brake pedal or booster
push rod
(Disc brake)
Missing or damaged brake pad
anti±squeal shim
Pad wear and pad wear indicator making
contact with the rotor
Burred or rusted calipers
(Drum brake)
Weak damaged or incorrect shoe
hold±down springs, loose or damaged
shoe hold±down spring pins and springs
and grooved backing plate ledges Squeaking, squealing
groaning or chattering
noise when brakes are
applied
Note: Brake friction
materials inherently
generate noise and heat in
order to dissipate eniergy.
As a result, occasional
squeal is normal and is
aggravated by severe
environmental conditions
such as cold,' heat,
wetness, snow, salt, mud,
etc. This occasional squeal
is not a functional problem
and does not indicate any
loss of brake effectivenessInspect, repair or replace
Clean or replace
Inspect for correct usage or
replace
Inspect and adjust
Inspect and lubricate as
necessary
Repair or replace
Repair or replace
Repair or replace
Replace
Replace
Repair or replace
Repair or replace
Replace drum
TROUBLESHOOTING (Cont'd)
Replace
Replace
Clean or deburr
Inspect and adjust
Inspect, repair or replace Squealing and
squeaking noise when
brakes are not applied
BR±26, 42
BR±26, 42
BR±26, 42
BR±26, 42 BR±18,34
BR±18, 34
BR±18, 34
BR±18, 34
Inspect, repair or replace as
necessaryBR±18, 34
BR±18, 34
BR±18, 34 BR±18, 26,
34
BR±18, 26
34
±Inspect, repair or replace
BR±9,15
26 Possible cause
BR± 18, 34 BR±6,16 . Page Remedy
BR±6, 16 Problem
BR±26
± BRAKE SYSTEMTroubleshootingBR±4

OPERATIONAL TEST OF BRAKE
BOOSTER
HINT: If there is leakage or lack of vacuum, repair before
testing. If available, use a brake booster tester to check the
booster operating condition.
1. OPERATING CHECK
(a) Depress the brake pedal several times with the en-
gine stopped, and check that is no change in the ped-
al reserve distance.
(b) Depress the brake pedal and start the engine. If the
pedal goes down slightly, operation is normal.
2. AIR TIGHTNESS CHECK
(a) Start the engine and stop it after one or two minutes.
Depress the brake pedal several times slowly. If the
pedal goes down furtherest the first time, but gradual-
ly rises after the second or third time, the booster is air
tight.
(b) Depress the brake pedal while the engine is running,
and stop it with the pedal depressed. If there is no
change in pedal reserve travel after holding the pedal
for thirty seconds, the booster is air tight.
BLEEDING OF BRAKE SYSTEM
HINT: If any work is done on the brake system or if air is sus-
pected in the brake lines, bleed the system of air.
NOTICE: Do not let brake fluid remain on a painted surface.
Wash it off immediately.
1. FILL BRAKE RESERVOIR WITH BRAKE FLUID
Check the fluid level in the reservoir. If necessary, add
brake fluid. 5. CHECK THAT PEDAL RESERVE DISTANCE IS
CORRECT
Release the parking brake. With engine running, depress
the pedal and measure the pedal reserve distance, as
shown.
Pedal reserve distance from asphalt sheet at 50 kg
(110.2 1b): More than 85 mm, (3.35 in.)
If incorrect, troubleshoot the brake system.
2. BLEED MASTER CYLINDER
HINT: If the master cylinder was disassembled or if the res-
ervoir becomes empty, bleed the air from the master cylin-
der.
(a) Disconnect the brake tubes from the master cylinder.
(b) Depress the brake pedal and hold it.
± BRAKE SYSTEMChecks and AdjustmentsBR±7