TOYOTA PREVIA 91-97 REPAIR MANUAL

DRIVEABILITY AND EMISSIONS CONTROLS 4-31

TROUBLE CODES

General Information

I See Figure 95

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

Data Link Connector (DLC)

» See Figures 96, 97, 98, 99 and 100

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

w/o Tachometer

-,, -—^v-o 00 ^?^^--

A- • <C7 r~- /?''^

:r^: : O^ H &)

Fig. 95 The Malfunction Indicator Lamp (MIL) is located in the

instrument panel and illuminates each time the vehicle is

started

Fig. 96 Pull this lever to lift up the drivers seat in order to

access the engine compartment

SSS m

ill Ils

Fig. 97 Open the DLC1 cap and read the terminal locations

SST

TE1

Fig. 98 The Data Link Connector 1 (DLC1) terminal identifica-

tion—1991-94 models

SST

DLC1

Fig. 99 Data Link Connector 1 (DLC1) terminal identification—

1995 models