Opel Frontera UBS. Service manual — part 2492
7A–18
AUTOMATIC TRANSMISSION (4L30–E)
Chart 9c: Coastdown Harsh Shift Or Clunk At 3–2 Downshift
Step
Action
Yes
No
1
Check line pressure. Refer to Line Pressure Test in this section.
Was line pressure normal?
Go to Step 2
Use Chart 15b:
Possible Causes
of High Line
Pressure in this
section
2
Does DTC P1850 set?
Diagnose P1850
first
Replace band
apply solenoid
(PWM) (323)
Chart 10: Intermittent 4TH TO 2ND Gear Downshift At Steady Speed
Step
Action
Yes
No
1
Check for consistent speed sensor reading with scan tool.
Was the reading correct?
Replace mode
switch for
intermittent
contact.
Go to Step 2
2
1. Check for wiring harness damage or short to ground. If OK, go
to (2).
2. Check transmission speed sensor connections. If OK, go to
(3).
3. Replace transmission speed sensor.
Was the replacement complete?
—
Replace speed
sensor.
Chart 11: Engine Flare At Shifting During Turning Only (Usually With Warm Engine)
Step
Action
Yes
No
1
Check for oil leaks at transmission.
Was the problem found?
Replace
transmission oil
filter and gasket
—
Chart 12: Engine Flare During 1–2 Or 2–3 Shift
Step
Action
Yes
No
1
Check line pressure. Refer to Line Pressure Test in this section.
Was line pressure normal?
Go to Step 2
Use Chart 15a:
Possible Causes
of Low Line
Pressure in this
section
2
1. Check for a stuck 1–2 accumulator valve (320).
2. Check for servo piston (106) leaks.
3. Check for a stuck band apply solenoid (323).
Was line pressure normal?
Repair or replace
—
7A–19
AUTOMATIC TRANSMISSION (4L30–E)
Chart 13: Shudder Only During Torque Converter Clutch (TCC) Applying
Step
Action
Yes
No
1
1. TCC shudder is one of the most commonly misdiagnosed
conditions in an automatic transmission. The key to
diagnosing TCC shudder is to note when it happens and under
what conditions. Once the TCC has been fully applied, it is
nearly impossible to make it shudder. TCC shudder (short
burst of noise normally less than 1 second) will only occur
during clutch applying. It is not a steady state condition.
2. Drive until whole drivetrain is at normal operating temperature.
– On 4WD vehicles, the test must be performed with transfer
case selector lever in “2H” position.
– Shudder is a short burst of noise normally less than 1 second
in duration, and can be induced by the following maneuver:
3. From coast condition at 50 mph in “D” range (Normal mode),
depress the throttle to 1/4-1/3 throttle. If present, shudder will
occur within 5 seconds together with TCC application.(The
scan tool may be used to determine the exact time of TCC
applying)
Was the problem found?
Replace
transmission fluid
and filter (remove
both pans) and
flush cooler lines.
Replace
converter
assembly and
O-ring on turbine
shaft
Perform
mechanical
inspection of
other drivetrain
components.
Chart 14: Possible Causes Of Transmission Noise
CAUTION: Before checking transmission for what
is believed to be transmission noise, ensure
presence and positioning of insulating plugs, pads
etc. Also make sure that noise does not come from
other drivetrain components.
Condition
Possible cause
Correction
Whine or Buzz
Oil level low
Fill with ATF, check for external
leaks.
Plugged or restricted oil filter
Inspect oil filter.
Replace oil filter or ATF as necessary.
Damaged oil filter gasket
Replace oil filter gasket.
Knocking noise from front of
transmission
Loose bolts (Converter to flex plate)
Tighten to specifications.
transmission.
Cracked or broken flex plate
Replace flex plate.
Converter damaged
Replace converter.
Knocking noise while driving, mostly
on acceleration.
Transmission mount loose or broken
Tighten mount bolts or replace
transmission mount.
Cooler line mounts loose or broken
Tighten or replace cooler line
mounts.
Cooler lines touching body or frame
Repair or replace as necessary.
Knocking noise when vehicle is
stationary
Loose flex plate mounting bolts
Tighten to specifications.
stationary.
Cracked or broken flex plate
Replace flex plate.
Damaged converter
Replace converter.
7A–20
AUTOMATIC TRANSMISSION (4L30–E)
Chart 15a: Possible Causes of Low Line Pressure
Step
Action
Yes
No
1
Check oil level.
Was the problem found?
Fill with ATF
Go to Step 2
2
Check for defective throttle position sensor.
Was the problem found?
Replace throttle
position sensor
Go to Step 3
3
Check for plugged, loose, or damaged oil filter (79).
Was the problem found?
Inspect oil filter,
tighten bolts or
replace oil filter
(79)
Go to Step 4
4
Check for a stuck force motor plunger (404). (Adapter case valve
body)
Was the problem found?
Replace force
motor plunger
(404)
Go to Step 5
5
Check for a stuck feed limit valve (412). (Adapter case valve body)
Was the problem found?
Replace feed limit
valve (412)
Go to Step 6
6
Check for loose converter bolts (4 & 5).
Was the problem found?
Tighten converter
bolts (4 & 5)
Go to Step 7
7
Check for a stuck pressure regulator valve (208). (Oil pump)
Was the problem found?
Replace pressure
regulator valve
(208)
Go to Step 8
8
Check for a stuck boost valve (205).(Oil pump)
Was the problem found?
Replace boost
valve (205)
Go to Step 9
9
Check for blocked intermediate oil passages to pressure
regulator valve. (Oil pump)
Was the problem found?
Replace oil pump
Go to Step 10
10
Check for defective oil pump (9, 201, 202 & 209).
Was the problem found?
Replace oil pump
Go to Step 11
11
Check for internal leaks.
– Check balls missing or out of location in valve bodies
– Seals cut or damaged
– Gaskets defective, etc.
Was the problem found?
Install balls, or
correct ball
location
Replace seals
Replace gaskets
—
7A–21
AUTOMATIC TRANSMISSION (4L30–E)
Chart 15b: Possible Causes Of High Line Pressure
NOTE: If transmission is operating in backup mode, high
line pressure will be present.
Step
Action
Yes
No
1
Check for defective throttle position sensor.
Was the problem found?
Replace throttle
position sensor.
Go to Step 2.
2
Check for a stuck force motor plunger (404). (Open
circuit/intermittent) (Adapter case valve body)
Was the problem found?
Replace force
motor plunger
(404)
Go to Step 3
3
Check for a stuck feed limit valve (412). (Adapter case valve body)
Was the problem found?
Replace force
motor plunger
(412)
Go to Step 4
4
Check converter bolts (4 & 5).
Was the problem found?
Tighten converter
bolts (4 & 5)
Go to Step 5
5
Check for a stuck pressure regulator valve (208). (Oil pump)
Was the problem found?
Replace pressure
regulator valve
(208)
Go to Step 6
6
Check for a stuck boost valve (205). (Oil pump)
Was the problem found?
Replace boost
valve (205)
Go to Step 7
7
Check for internal leaks.
– Check balls missing or out of location in valve bodies
– Seals cut or missing
– Gaskets defective, etc.
Was the problem found?
Install balls, or
correct ball
location
Replace seals
Replace gaskets
—
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