Opel Zafira B MPV 2006 Owners Workshop Manual page 353

Automatic transmission
Note:
Due to the complexity of the automatic transmission, it
is
difficult
for the home mechanic to properly diagnose and service this unit. For
problems other than the following, the vehicle should be taken to a
dealer service department or automatic transmission specialist. Do not
be too hasty in removing the transmission if a fault
is
suspected, as
most of the testing is carried out with the unit still fitted. Remember
that, besides the sensors specific to the transmission, many of the
engine management system sensors described in Chapter 4A and 48
are essential to the correct operation of the transmission.
Fluid leakage
[] Automatic transmission fluid is usually dark red in colour. Fluid
leaks should not be confused with engine oil, which can easily be
blown onto the transmission by airflow.
D
To determine the source of a leak, first remove all built-up dirt and
grime from the transmission housing and surrounding areas using
a degreasing agent, or by steam-cleaning. Drive the vehicle at low
speed, so airflow will not blow the leak far from its source. Raise
and support the vehicle, and determine where the leak is coming
from. The following are common areas of leakage:
a) Fluid pan
b) Dipstick tube (Chapter 78)
c) Transmission-to-fluid cooler unions (Chapter 78)
Transmission fluid brown, or has burned smell
O
Transmission fluid level low (Chapter 78)
General gear selection problems
O
Chapter 78 deals with checking the selector cable on automatic
transmissions. The following are common problems which may be
caused by a faulty cable or sensor:
Driveshafts
Vibration when accelerating or decelerating
[] Worn inner constant velocity joint (Chapter 8)
D
Bent or distorted driveshaft (Chapter 8)
O
Worn intermediate bearing (Chapter 8)
Fault finding
REF•21
a) Engine starting in gears other than Park or Neutral.
b) Indicator panel indicating a gear other than the one actually being
used.
c) Vehicle moves when in Park or Neutral.
d) Poor gear shift quality or erratic gear changes.
Transmission will not downshift (kickdown} with
accelerator pedal fully depressed
D
Low transmission fluid level (Chapter 78)
Engine management system fault (Chapter 4A or 48)
D
Faulty transmission sensor or wiring (Chapter 78)
D
Incorrect selector cable adjustment (Chapter 78)
Engine will not start in any gear, or starts in gears
other than Park or Neutral
D
Faulty transmission sensor or wiring (Chapter 78)
D
Engine management system fault (Chapter 4A or 48)
D
Incorrect selector cable adjustment (Chapter 78)
Transmission slips, shifts roughly, is noisy, or has
no drive in forward or reverse gears
[J Transmission fluid level low (Chapter 78)
D
Faulty transmission sensor or wiring (Chapter 78)
O
Engine management system fault (Chapter 4A or 48)
Note: There are many probable causes for the above problems, but
diagnosing and correcting them is considered beyond the scope of
this manual. Having checked the fluid level and all the wiring as far as
possible,
a
dealer or transmission specialist should be consulted if the
problem persists.
Clicking or knocking noise on turns (at slow speed
on full-lock)
[] Worn outer constant velocity joint (Chapter 8)
D
Lack of constant velocity joint lubricant, possibly due to damaged
gaiter (Chapter 8)