Toyota Corolla Repair Manual: Pre–check
1. Diagnosis check

- Starting diagnosis mode (service check mode)
- turn off the audio system and turn the ig switch to
acc. While pressing the preset switches ”1” and ”6”
at the same time, press ”cd” 3 times.
- Reference:
- beep sound is given 3 times and the system
enters the service check mode.
- It may take about 40 sec. To complete the
check.
- In the service check mode, the system check
and the diagnosis memory check are performed,
and the check results are displayed
in ascending order of the device codes.
(Physical address)

Code no. (Physical address) list

- Finishing diagnosis mode
- press ”cd” for 2 sec. Or more, or turn the ig switch
off.
- Service check mode result display (for checking the current
and the past system conditions)
- press the ”tune” switch to see the check result of
each device.

- Check result display
Display |
Original language |
Meaning |
Action to be taken |
Good |
Good (normal) |
No dtc is detected in both ”system check mode” and
”diagnosis memory mode”. |
– |
Ncon |
No connection |
The system recognized the component when it was registered,
but the component gives no response to the ”diagnosis
mode on request”. |
Check the power source circuit
and the communication
circuit of the device indicated
by the device code
(physical address). |
Echn |
Exchange |
One or more dtc for ”exchange” is detected in either ”system
check mode” or ”diagnosis memory mode”. |
Go to the detail information
mode to check the trouble
area referring to the dtc
list. |
Chec |
Check |
When no dtc is detected for ”exchange”, one or more dtc
for ”check is detected in either ”system check mode” or
”diagnosis memory mode”. |
Go to the detail information
mode to check the trouble
area referring to the dtc
list. |
Old |
Old version |
Old dtc application is identified and dtc is detected in either
”system check mode” or ”diagnosis memory mode”. |
– |
Nres |
No response |
The device gives no response to any one of ”system check
mode on request”, ”system check result request” and
”diagnosis memory request”. |
Check the power source circuit
and the communication
circuit of the device indicated
by the device code
(physical code). |
- To perform the service check again, press the preset
switch ”1”.
- detail information mode (when displaying the troubled
device’s dtc)
- with ”chec” or ”echn” being display, press the
preset switch ”2” to go to the detail information
mode.
- Press the ”tune” switch to display ”system check
result (sys)” and ”diagnosis memory response
(code)”.

- Displayed items in detail information mode
Division code for
dtc display |
Meaning |
Order of detailed information displayed when the
”tune up”
switch is pressed. (The order is reversed when the ”tune
down” switch is pressed.) |
Sys |
System check result is displayed. |
Logical address
dtc |
Code |
Diagnosis memory check result is displayed. |
Logical address
dtc
sub code
connection confirmation number
the number of times of occurrence |
- Check the trouble area referring to the dtc list.
- to return to the service check mode, press the preset
switch ”3”.
- clearing individual dtc memory (when clearing the
memory of dtc detected in the pest individually)
- ) press the preset switch ”5” for 2 sec. Or more while
the ”echn” is displayed in the service check mode
or during the detail information mode.
Hint
:
- beep sound is given once when the dtc memory is completely
cleared.
- When dtc memory is cleared, only the component code
(physical address) is displayed for the target component.
- To check dtc, press the preset switch ”1” and perform the
service check again.
- clearance of all dtc memory (when clearing all the
memory of dtc detected in the past)
- start the diagnosis mode after repairing the trouble
area.
- Press the preset switch ”5” for 2 sec. Or more. (”Clr”
is displayed at this time.)
Hint
:
- beep sound is given once when the dtc memory is completely
cleared.
- When dtc memory for all the device is cleared, only the
component codes (physical address) are displayed.
- Press the preset switch ”1” to perform the service
check again, and check that no dtc is displayed for
all the component codes. (Physical address)
2. Identification of noise source
- Identify the condition under which the noise occurs, and
check the noise filter on the related part.

- Reference:
- make sure first that there is no noise from outside.
- Failing to do so makes the noise source detection
difficult and leads to misunderstanding.
- The noise should be removed in descending order
of loudness.
- Setting the radio untuned makes noise noticeable,
making the recognition of the phenomenon easier.
1 Vehicle brought to workshop
2 Customer problem analysis
3 Check and clear dtc
4 Problem symptom confirmation
Symptom does not occur (go to
step 5)
5 Symptom simulation
6 Dtc check ...
Terms
Terms
Physical address
Three–digit code (shown in hexadecimal) which is given to each
component comprising
the avc–lan.
Corresponding to the function, i ...
Other materials:
Speed sensor front lh
Replacement
Hint:
replace the rh side by the same procedure as the lh side.
1. Remove front wheel
2. Remove front fender liner lh
3. Remove speed sensor front lh
Disconnect the speed sensor wire harness clamp from
the body.
disconnect the speed sensor connector.
Remo ...
Circuit description
The airbag front rh sensor circuit consists of the airbag sensor assy center
and airbag front rh sensor.
Dtc b1156/b1157/15 is recorded when a malfunction is detected in the airbag
front rh sensor circuit.
Wiring diagram
...
Concept, General information, Safety information
Concept
Various connection types are available for using
mobile devices in the vehicle. The connection
type to select depends on the mobile device and
the desired function.
General information
The following overview shows possible functions
and the suitable connection types for them. The
scope of fu ...