Inspection Procedure 5: When the ignition switch is turned to the "ON"
position (engine after start-up), ABS warning lamp remains
illuminated.
| caution |
If the ABS-ECU has a malfunction, or the battery
voltage increases abnormally, the ABS-ECU is deactivated, and the ABS
warning lamp is illuminated, disabling the communication with M.U.T.-III.
When the communication with M.U.T-III cannot be performed, carry out the
troubleshooting according to the Inspection Procedure 1. (Refer to  .)
|
| note |
The following inspection must be performed only when
the communication with M.U.T.-III can be performed (ABS-ECU power supply is
normal) with no diagnosis code being set.
|
OPERATION
- When the power is supplied, the ABS-ECU illuminates the ABS warning lamp
for approximately 3 seconds by turning the warning lamp drive transistor
inside the ABS-ECU (OFF → ON). Then, if the system has no abnormality,
the ABS-ECU turns off the warning lamp by turning (ON → OFF) the
warning lamp drive transistor.
- Even when the ABS-ECU is deactivated, the ABS warning lamp is illuminated
by the valve relay.
COMMENT ON TROUBLE SYMPTOM
For the cause that the lamp remains
illuminated, the following malfunctions are suspected.
- Malfunction of the combination meter internal circuit
- The lamp drive signal is not input to the combination meter internal
circuit.
PROBABLE CAUSES
The most likely causes for this case
are:
- Combination meter defect
- Open circuit of the lamp drive signal line
- Malfunction of the ABS-ECU
|
|
STEP 1. Inspect the ABS warning lamp illumination with ABS-ECU
connector D-250.
|
|
|
| note |
Prior to the inspection of the ABS warning lamp
illumination, check the ABS-ECU connector D-250, and repair if
necessary.
|
|
|
|
(1)Disconnect ABS-ECU connector D-250.
|
|
|
(2)Turn the ignition switch to the "ON" position.
|
|
|
(3)Check that the ABS warning lamp illuminates when the
ABS-ECU connector D-250 terminal No. 50 is connected to the body
earth.
OK: Illuminates
|
|
|
Q.
Is the check result normal?
|
|
|
 Replace the ABS-ECU. Then go to
Step 3.
|
|
|
|
|
|
 Go to Step 2.
|
|
|
|
|
|
STEP 2. Check the harness wire between the combination meter connector
D-02 terminal No.50 and ABS-ECU connector D-250 terminal
No.50.
|
|
|
| note |
Prior to the wiring harness inspection, check
intermediate connector D-230, and repair if necessary.
|
|
|
|
Q.
Is the check result normal?
|
|
|
Replace the combination
meter.
|
|
|
|
|
|
Go to Step 3.
|
|
|
|
|
|
STEP 3. Retest the system.
|
|
|
Q.
Does the ABS warning lamp extinguish?
|
|
|
The
procedure is complete.
|
|
|
|
|
|
Start over at Step 1.
|
|
|
|