Honda Acura NSX 1991 Service Manual page 729

ALB Checker
4. Turn the Mode Selector switch further to "2".
5. Depress the brake pedal firmly and push the Start
Test switch
The anti-lock brake system indicator light should
not go on while the Test in Progress light is ON.
There should be kickback on the brake pedal. If not
as described, go to troubleshooting, page 19-44.
NOTE: The operation sequence simulated by
Modes 2, 3, 4 and 5:
START
About 30 seconds
6. Turn the Mode Selector switch to 3, 4 and 5.
Perform step 5 for each of the test mode positions.
Mode 1:
Sends the simulated driving signal 0 km/h (0 mph)
each wheel to the control unit to check the control
unit self diagnosis circuit. There should be NO
kickback.
Mode 2:
Sends the driving signal of each wheel, then sends
the lock signal of the rear left wheel to the control
unit. There should be kickback.
Mode 3:
Sends the driving signal of each wheel, then sends
the lock signal of the rear right wheel to the control
unit. There should be kickback.
Mode 4:
Sends the driving signal of each wheel, then sends
the lock signal of the front left wheel to the control
unit. There should be kickback.
.
Mode 5:
Sends the driving signal of each wheel, then sends
the lock signal of the front right wheel to the con-
trol unit. There should be kickback.
NOTE: If little or no kickback is felt from the brake
pedal in modes 2-5, repeat the function test of
modes l-5 several times before beginning to
troubleshoot other parts of the system.
Mode 6:
Not used on this model.
Inspection points:
1 . The anti-lock brake system indicator light goes ON
in mode 1.
Check the wiring. If it is in good condition, the
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control unit is faulty.
If anti-lock brake system indicator light goes on
120 seconds later but the power unit stops,
refer to page 19-47.
END
2. There are no kickback in modes 2 through 5.
Faulty pressure switch (remains ON)
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Shorted wires
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Faulty or disconnected power unit connector
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Faulty power unit relay
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3. Weak kickback in modes 2 through 5.
Bleed high pressure circuits.
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4. Power unit stops in mode 1 but it does not stop and
there are no kickback in modes 2 through 5.
Brake fluid leakage
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Bleed power unit
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Clogged power unit outlet
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Clogged or deteriorated power unit hose
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