Brake Warning Indicator: Description and Operation
CHECKING THE NUMBER OF L.E.D. FLASHES
When a problem occurs in the ABS, the warning light on the instrument panel comes on. As shown in the Table, the control unit performs self-diagnosis. To obtain satisfactory self-diagnosing results, the vehicle must be driven above 30 km/h (19 MPH) for at least one minute before the self-diagnosis is performed. After the vehicle is stopped, the number of L.E.D. flashes is counted while the engine is running. The L.E.D. is located on the control unit, identifying a malfunctioning part or unit by the number of flashes. Both the warning light and the L.E.D. persistently activate, even after a malfunctioning part or unit has been repaired, unless the ignition switch is turned "OFF". After repairs, turn the ignition switch "OFF". Then start the engine and drive the vehicle over 30 km/h (19 MPH) for at least one minute to ensure that the malfunctioning part or unit has been repaired properly. If more than two circuits malfunction at the same time, the L.E.D. will flash to indicate one of the malfunctioning circuits. After the circuit has been repaired, the L.E.D. will then flash to indicate that the other circuit is malfunctioning.
TCS CONTROL UNIT L.E.D.
The control unit computes the rotating speed of each when using the signal current sent from the sensor. When the unit judges the "SLIP" for the driven wheel(s), it supplies a DC current of about 5A, about 2A or OA to the TCS actuator pressure solenoid valve provided for each rear brake, and/or it sends the secondary throttle valve opening signal to the throttle control module (T.C.M.). The TCS control unit also has anti-lock braking system (ABS) control functions. If an electrically detectable malfunction should occur in the system, the control unit causes the SLIP and TCS OFF indicators, and/or ABS warning lamp to light up, and the L.E.D. indicator to flash the number of times which corresponds to the malfunction location. In this condition, the TCS and/or ABS will be deactivated by the control unit.
T.C.M. L.E.D.
The T.C.M. has only one L.E.D.
Description
Self-diagnosis is always functioning as long as the ignition switch is set in the "ON" or "START" position. The malfunction code is indicated by the number of flashes of the L.E.D. as shown below:
Long (0.6 second) blinking indicates the number of ten digits and short (0.3 second) blinking indicates the number of single digits.
For example, the L.E.D. flashes once for 0.6 seconds and then it flashes twice for 0.3 seconds. This indicates the number "12" and refers to a malfunction in the secondary throttle sensor circuit. In this way, all the problems are classified by their code numbers.
How to erase self-diagnostic results
The self-diagnostic results stored in the T.C.M. can be erased by any of the following three methods.
(1) Depress the accelerator fully (1st throttle) and set the neutral switch to OFF (automatic transmission is in other than "P" and "N" positions). In this state, turn ON the ignition key (engine need not be started). After this, set the neutral switch to ON, and release the accelerator. This will erase the diagnostic results of all items.
(2) If diagnostic judgment on a particular item remains OK and NO GO (N.G.) judgment is made while the ignition key is turned ON 50 times, the diagnostic results on that item are erased.
(3) If the backup power supply is disconnected for more than one minute, the diagnostic results on all items are erased. In addition, the values learned by the system are also erased.
T.C.M. fail-safe