Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 310
5A-31 Automatic Transmission/Transaxle:
Manual Road Test
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WARNING
!
• Carry out test in very little traffic area to prevent an accident.
• Test requires 2 persons, a driver and a tester.
The purpose of this test is to judge whether causal factor of trouble which occurred in automatic transaxle is electrical
or mechanical by disconnecting valve body connector (1) and fixing automatic transaxle gear position (fail-safe
function).
1) Start engine and warm it up to normal operating temperature.
2) After warming up engine, turn ignition switch to OFF position and disconnect valve body connector (1).
3) Turn OFF all electrical loads.
With shift select lever shifted to each range (“L”, “2”, “3” and “D”) drive vehicle at 1,000 rpm engine speed and then
check vehicle speed by referring to “Fixed gear position”.
If vehicle speed is not as specified in “Fixed gear position” table, go to troubleshooting.
4) Connect valve body connector and clear DTC.
Fixed gear position
Troubleshooting
Select lever position
Fixed gear position
Vehicle speed
L range
1st gear
Approx. 9.2 km/h (5.7 mile/h)
2 range
3rd gear
Approx. 17.4 km/h (10.8 mile/h)
3 range
4th gear
Approx. 37.7 km/h (23.4 mile/h)
D range
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Condition
Possible cause
Correction / Reference Item
Selected gear is incorrect Faulty valve body component
Replace valve body assembly.
Faulty clutch or brake
Inspect clutch and brake. If any parts are faulty,
replace them.
Automatic Transmission/Transaxle: 5A-32
Stall Test
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This test is to check overall performance of automatic transmission and engine by measuring stall speed at “D” and
“R” ranges. Be sure to perform this test only when transmission fluid is at normal operating temperature and its level is
between FULL and LOW marks.
CAUTION
!
• Do not run engine at stall more than 5 seconds continuously, for fluid temperature may rise
excessively high.
• After performing stall test, be sure to leave engine running at idle for longer than 1 minute before
another stall test.
1) Apply parking brake and block wheels.
2) Install tachometer.
3) Start engine with select lever shifted to “P”.
4) Depress brake pedal fully.
5) Shift select lever to “D” and depress accelerator pedal fully while watching tachometer. Read engine rpm quickly
when it has become constant (stall speed).
6) Release accelerator pedal immediately after stall speed is checked.
7) In the same way, check stall speed in “R” range.
8) Stall speed should be within following specification.
Engine stall speed
Standard: 2,450 – 2,750 rpm
Troubleshooting
Condition
Possible cause
Correction / Reference Item
Lower than standard level
in both “D” and “R” range
Engine output torque failure
Inspect and repair engine.
Faulty one-way clutch of torque
converter
Replace torque converter.
Higher than standard
level in “D” range
Malfunction of pressure control solenoid
valve (Low line pressure)
Inspect. If NG, replace valve body assembly.
Malfunction of primary regulator valve
(Low line pressure)
Replace valve body assembly.
Slippery O/D clutch
Inspect. If NG, replace.
Slippery forward clutch
Inspect. If NG, replace.
Faulty O/D one-way clutch
Inspect. If NG, replace.
Faulty one-way clutch No.2
Inspect. If NG, replace.
Leakage from “D” range fluid pressure
circuit
Overhaul or replace valve body assembly.
Higher than standard
level in “R” range
Malfunction of pressure control solenoid
valve (Low line pressure)
Inspect. If NG, replace valve body assembly.
Malfunction of primary regulator valve
(Low line pressure)
Replace valve body assembly.
Slippery direct clutch
Inspect. If NG, replace.
Slippery reverse brake
Inspect. If NG, replace.
Faulty O/D one-way clutch
Inspect. If NG, replace.
Leakage from “R” range fluid pressure
circuit
Overhaul or replace valve body assembly.
Higher than standard
level in both “D” and “R”
range
Malfunction of pressure control solenoid
valve (Low line pressure)
Inspect. If NG, replace valve body assembly.
Malfunction of primary regulator valve
(Low line pressure)
Replace valve body assembly.
Clogged oil strainer
Replace.
Faulty oil pump
Inspect. If NG, replace.
Leakage from both “D” and “R” range
fluid pressure circuit
Overhaul or replace valve body assembly.
5A-33 Automatic Transmission/Transaxle:
Time Lag Test
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This test is to check conditions of clutch, reverse brake and fluid pressure. “Time lag” means time elapsed since select
lever is shifted with engine idling till shock is felt.
1) With chocks placed before and behind front and rear wheels respectively, depress brake pedal.
2) Start engine.
3) With stop watch ready, shift select lever from “N” to “D” range and measure time from that moment till shock is felt.
4) Similarly measure time lag by shifting select lever from “N” to “R” range.
Gear shifting time lag
“N”
→ “D”: Less than 1.0 sec.
“N”
→ “R”: Less than 1.4 sec.
NOTE
• When repeating this test, be sure to wait at least one minute after select lever is shifted back to “N”
range.
• Engine should be warmed up fully for this test.
• Repeat test 3 times and take average of those data for final time lag data.
Troubleshooting
Condition
Possible cause
Correction / Reference Item
N
→
“D” time lag exceeds
specification
Malfunction of pressure control solenoid
valve (Low line pressure)
Inspect. If NG, replace valve body assembly.
Malfunction of primary regulator valve
(Low line pressure)
Replace valve body assembly.
Clogged oil strainer
Replace.
Faulty oil pump
Inspect. If NG, replace.
Faulty forward clutch
Inspect. If NG, replace.
Leakage from “D” range fluid pressure
circuit
Overhaul or replace valve body assembly.
N
→
“R” time lag exceeds
specification
Malfunction of pressure control solenoid
valve (Low line pressure)
Inspect. If NG, replace valve body assembly.
Malfunction of primary regulator valve
(Low line pressure)
Replace valve body assembly.
Clogged oil strainer
Replace.
Faulty oil pump
Inspect. If NG, replace.
Faulty direct clutch
Inspect. If NG, replace.
Faulty reverse brake
Inspect. If NG, replace.
Leakage from “R” range fluid pressure
circuit
Overhaul or replace valve body assembly.
Automatic Transmission/Transaxle: 5A-34
Line Pressure Test
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Purpose of this test is to check operating conditions of each part by measuring fluid pressure in fluid pressure line.
Line pressure test requires following conditions.
• Automatic fluid is at normal operating temperature (70 – 80
°C / 158 – 176 °F).
• Fluid is filled to proper level (between FULL and LOW on dipstick).
• Air conditioner switch is turned OFF.
1) Apply parking brake securely and place chocks against wheels.
2) Remove fluid pressure check hole plug bolt.
3) Attach oil pressure gauge to fluid pressure check hole in transmission case.
Special tool
(A): 09925–37811–001
CAUTION
!
After attaching oil pressure gauge, check that no fluid leakage exists.
4) Depress foot brake fully, run engine at idle and stall then check fluid pressure in “D” or “R” range.
CAUTION
!
• Do not continue running engine at stall speed longer than 5 seconds.
• After performing line pressure test, be sure to leave engine running at idle for longer than one
minute before performing another line pressure test.
Automatic transmission line pressure
5) If check result is OK,disconnect special tool, then tighten fluid pressure check hole bolt to specified torque.
Tightening torque
Fluid pressure check hole bolt: 8 N·m (0.8 kgf-m, 6.0 lb-ft)
“D” range
“R” range
At idle speed
304 – 362 kPa
(3.1 – 3.7 kg/cm
2
, 44 – 53 psi)
440 – 538 kPa
(4.5 – 5.5 kg/cm
2
, 64 – 78 psi)
At stall speed
1161 – 1321 kPa
(11.8 – 13.5 kg/cm
2
, 168 – 192 psi)
1485 – 1790 kPa
(15.2 – 18.3 kg/cm
2
, 216 – 260 psi)
(A)
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