General Troubleshooting Information - Honda Civic Service Manual

General Troubleshooting Information
ABS Indicator
. lf the system is OK,theABS indicator goes off 2
seconds after turning the ignition switch ON (ll)
without starting the engine, and then comes on again
and goes off 2 seconds later after starting the engine.
This occurs because the ABS control unitisturned
on by the lG2 power source.
. The ABS indicator comes on when the ABS control
unit detects a problem in the system. However, even
though the system is operating properly, the indicator
will come on under these conditions:
- Only the drive wheels rotate
- One drive wheel is stuck
- The vehicle goes into a spin
- The ABS continues to operate for a long time.
- The vehicle is subjected to an electrical signal
disturbance
To determine the actual cause of the problem, question
the customer about the problem. taking the above
condilions into consideration.
. When a Droblem is detected and lhe ABS indicator
comes on, there are cases when the indicator stays
on until the ignition switch is turned OFF, and cases
when the indicator goes off automatically when the
sYstem returns to normal.
- DTC 61: The ABS indicator goes off automatically
when the system returns to normal.
- D T C 1 1 , 1 3 , 1 5 , 1 7 , 3 1 , 3 2 , 3 3 , 3 4 , 3 5 , 3 6 , 3 7 , 3 8 , 5 4 ,
or 81: The ABS indicator stays on until the ignition
switch is turned OFF whether or not the system
returns to normal.
- D f C 1 2 , 1 4 , 1 6 , 1 a , 2 1 , 5 1 , 5 2 , o r 5 3 ; T h e A B S
indicator goes off when the vehicle is driven again
and the system is OK after the ignition switch is
t u r n e d f r o m O F F t o O N { l l } .
Diagnostic Trouble Code {DTCI
. The memory can hold three DTCS. However, when
the same DTC is detected more than once, the more
recent DTC is written over the earlier one.
Therefore, when the same problem is detected
repeatedly, it is memorized as a single DTC.
. The DTCs are in the order they occurred, beginning
with the most recent.
. The DTCS are memorized in the EEPROM (non-
volatile memory). Therefore. the memorized DTCs
are not cleared when the battery is disconnected, the
ignition switch is turned off, or the system returns to
normal. Do the specified procedures to clear the
DTCs.
Self-diagnosis
. Self-diagnosis can be classified into two categories:
- I n i t i a l d i a g n o s i s :
Done right after the engine starts and until the ABS
indicator goes off
- R e g u l a r d i a g n o s i s :
D o n e r i g h t a f t e r t h e i n i t i a l d i a g n o s i s u n t i l t h e
ignition switch is turned OFF
. When a problem is detected by self-diagnosis, the
system does the following:
- Turns the ABS indicator on
- Memorizes the DTC
- Stops ABS control
Kickback
The pump motor operates when the ABS is functioning,
and the fluid in the reservoir is forced out to the master
c y l i n d e r , c a u s i n g k i c k b a c k a t t h e b r a k e p e d a l .
Pump Motor
. The pump motor operates when the ABS is
f u n c t i o n i n g .
. The ABS control unit checks the pump motor
operation when the vehicle is started the first time
after the ignition switch is turned ON (ll). You may
hear the motor operate at this time, but it is normal.
(cont'd)
19-31