Toronado V6-3800 3.8L (1988)
ABS Light: Description and Operation
Antilock Warning Lamp Operation
The ABS use "ANTILOCK" warning lamp to alert the vehicle driver that proper antilock braking may not be possible. The main relay will complete the
"ANTILOCK" warning lamp circuit when its control circuit is open. The electrical path for the lamp to light involves a complete circuit when the
ignition switch is in the "crank" or "run" position. The plug-in diode must provide continuity to "ANTILOCK" warning lamp to light under these
conditions. The EBCM will be turned OFF when:
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There is no 12-volt power to EBCM terminal 2 ("ignition enable").
^
The EBCM has detected a circuit problem, and does not complete the main relay control circuit by sending 12-volt power from terminal 8 to the
main relay terminal 2.
^
The main relay fails to operate.
^
Lack of 12-volt power to the main relay terminal 4.
^
If the main relay fails to power up EBCM pins 3 and 20, the EBCM will complete the "ANTILOCK" warning lamp circuit. The EBCM will
complete the "ANTILOCK" warning lamp circuit when it is turned ON and the fluid level sensor or pressure switch contacts open a logic "loop"
circuit. At the same time, the "BRAKE" warning lamp circuit fluid level sensor or pressure switch contacts will close and illuminate the
"BRAKE" warning lamp.
THE EBCM IS PROGRAMMED TO STORE TROUBLE CODE INFORMATION in addition to operating "ANTILOCK" warning lamp as described
above. The EBCM will store ABS codes in a non-volatile memory, which is cleared only by driving the vehicle above 18 miles per hour. Disconnecting
the EBCM from the vehicle or taking "ignition enable" or main relay power from it will NOT erase codes. The following components relate to ABS
codes:
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EBCM - codes 11 and 12
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Main valve - code 21
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LF inlet valve - code 22
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LF outlet valve - codes 23, 51, and 71
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RF inlet valve - code 24
^
RF outlet valve - codes 25, 52, and 72
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Rear inlet valve - code 26
^
Rear outlet valve - codes 27, 54, and 74
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LF wheel speed sensor - codes 31, 41, 45, 55, and 75
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RF wheel speed sensor - codes 32, 42, 46, 56, and 76
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RR wheel speed sensor - codes 33, 43, 47, 57, and 77
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LR wheel speed sensor - codes 34, 44, 47, 58, and 78
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Three wheel speed sensors at the same time - code 48
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Fluid level sensor/pressure "loop" circuit - code 61
Refer to "DIAGNOSIS AND TESTING PROCEDURES" for information on code diagnosis and self diagnostics procedures.
