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General Troubleshooting Information
ABS lndicator
. l f t h e s y s t e m i s O K , t h e A B S i n d i c a t o r g o e s o f f 2
seconds after turning the ignition switch ON (ll)
w i t h o u t s t a r t i n g t h e e n g i n e . a n d t h e n c o m e s o n a g a i n
and goes off 2 seconds later after starting the engine.
T h i s o c c u r s b e c a u s e t h e A B S c o n t r o l u n i t i s t u r n e d
on bv the lG2 oower source.
. The ABS indicator comes on when the ABS control
unit detects a problem in the svslem. 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
- T h e v e h i c l e g o e s i n t o a s p i n
- The ABS continues to operate for a long time.
- The vehicle is subjected to an electrical signal
disturbance
To determine the actual cause ofthe problem, question
the customer about the problem. taking the
above-listed conditions into consideration.
. When a problem is detected and the 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 or 62:The ABS indicator goes off
automaticallv when the system returns to normal.
- D T C 1 1 , 1 3 , 1 5 , 1 1 , 3 1 , 3 2 , 3 3 , 3 4 , 3 5 , 3 6 , 3 7 , 3 8 , 5 4 ,
7 1 . o r 8 ' 1 : T h e A B S i n d i c a t o r s t a y s o n u n t i l t h e
ignition switch is turned OFF whether or not the
system returns to normal.
- Dr c't2, 1 4, 1 6, 18, 21, 22, 23, 24, 41, 42, 43, 44, 51,
52, or 53: The ABS indicator goes off when the
vehicle is driven again and the system is OK after
t h e i q n i t i o n s w i t c h i s 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 any number oJ 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 Droblem is detected
repeatedly, it is memorized as a single DTC.
. The DTCS are indicated 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 :
Done right after the initial diagnosis until the
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
oDeration when the vehicle is staned 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)
19-33
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Table of Contents
Troubleshooting
