TOYOTA PREVIA 91-97 REPAIR MANUAL

9-34 BRAKES

The function of the ABS is to help maintain directional stabilil:/ and
vehicle steerabilty on most road surface conditions. However, thfsystem
cannot prevent the vehicle from skidding if the cornering speed mil is
exceeded.
The ABS has a longitudinal sensor to match braking characteristics to
the full-time four wheel drive on 4WD models.
In case a malfunction occurs, a diagnosis function and fail-saty system
have been adopted for the ABS to increase serviceability.

Diagnosis and Testing

The ECM contains a built-in, self-diagnosis system which det^ts trou-
bles within the engine signal network. Once a malfunction is detected, the
Malfunction Indicator Lamp (MIL), located on the instrument pant I, will
light.
By analyzing various signals, the ECM detects system malfunctions
related to the operating sensors. The ECM stores the failure cod3
associated with the detected failure until the diagnosis systein is
cleared.
The MIL on the instrument panel informs the driver that a malfi. nction
has been detected. The light will go out automatically once the m Ifunction
has been cleared.

DATA LINK CONNECTORS (DLC)

The DLC1 is located under the drivers seat. The DLC3 is locatf
fuse box at the center of the upper driver's side dash.

READING CODES

2TZ-FE Engine

» See Figures 127,128,129 and 130

1. Make sure the battery voltage is about 12 volts.


2. Turn the ignition switch to the ON position.


3. Check that the ABS warning light illuminates for about 3 s«
   not, inspect and repair or replace the fuse, bulb or wiring harness,


4. Turn the ignition switch to the ON position.


5. Disconnect the service connector.

in the

onds. If

1 0919G40

Fig. 127 The ABS warning light is located in the instrumen

panel

6. Using a jumper wire connect terminals Tc to E1 of the check connector.
   7. In the event that there is a malfunction, 4 seconds later the warning
   light will begin to blink. Read the number of blinks.

   
   

   *The first number of blinks will equal the first digit of as two digit
   code. After a 1.5 second pause, the 2nd number of blinks will equal
   the 2nd number of the two digit code. If there are more than two or
   more codes, there will be a 2.5 second pause between codes. The
   indication will begin after a 4.0 second pause from the smaller
   value and continue in order to larger.

   
   

   
   


7. If the system is operating normally with no malfunctions, the warn-
   ing light will blink once every 0.5 seconds.


8. Repair the system.


9. After the malfunction occurs, and components have been repaired,
   clear the coeds stored in the ECM.


10. Remove the jumper wire from the TC and E1 terminals of the check
    connector.

Fig. 128 Disengage the service connector prior to reading the

ABS codes—2TZ-FE engine

TO

00Qi rt O

QQEJ 0 on

SST

Fig. 129 ABS Tc and E1 terminal locations of the check connec-

tor—2TZ-FE engine