Acura RL (1996-2004 year). Manual — part 518
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Troubleshooting
DTC 8-2: CPU
The ABS control unit checks the data of the two CPUs by comparison, and it keeps the ABS indicator light on if there are
any differences in the data between the CPUs. It turns the ABS indicator light on again if it detects any difference after the
light goes off.
Does the ABS indicator light
come on?
Is code 8-2 indicated?
The system is OK at this time.
Perform the appropriate trou-
bleshooting for the code.
DTC 8-4:IC (Integrated Circuit)
The ABS control unit checks the internal ICs during the initial diagnosis and regular diagnosis, and it keeps the ABS indicator
light on if it detects any abnormality. It turns the ABS indicator light on again if it detects any abnormality after the light goes off.
Replace the ABS control unit if DTC 8-4 is indicated with the SCS service connector connected (see page
).
With engine running, ABS indi-
cator light is ON.
With the SCS service connec-
tor connected (see page
),
DTC 8-2 is indicated.
Problem verification:
Start the engine.
).
Replace the ABS control unit.
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ABS Function Test
NOTE: The ABS system can be checked with the ALB
checker or with the Honda PGM Tester.
1. Raise the vehicle off the ground, and support it with
safety stands.
2. Check that there is no brake drag.
3. Turn the ignition switch ON (II), and confirm that the
ABS indicator light comes on.
If the ABS indicator light does not come on, follow
4.
Honda PGM Tester: Connect the PGM Tester as
described in the PGM Tester Anti-Lock Brake
System (ABS) Vehicle System Supplement. Follow
the tester's prompts instead of steps 5 through 11
of this procedure.
ALB Checker: With the ignition switch OFF, discon-
nect the ABS inspection connector (6P) from the
connector cover located under the glove box, and
connect it to the ALB checker. Continue with steps 5
through 11 of this procedure.
ALB CHECKER
ABS INSPECTION
CONNECTOR (6P)
5. Shift the transmission to position.
6. Start the engine and release the parking brake.
7. Turn the Mode Selector switch to "1".
Monitor Lights
Power ON Start Test Mode Selector
8. Push the Start Test switch. The ABS indicator light
should not come on while the Test in Progress light
is on.
If the ABS indicator light comes on, confirm the DTC
and perform the appropriate troubleshooting for the
code.
NOTE: Do not turn the Mode Selector switch when
the Test in Progress light is on. Damage to the ALB
checker can result.
9. Turn the Mode Selector switch to "2".
10. Depress the brake pedal firmly, and push the Start
Test switch. The ABS indicator light should not come
on while the Test in Progress light is on. There
should be kickback on the brake pedal.
Have the assistant check that the wheel controlled by
the ABS can be rotated by hand when there is kick-
back on the brake pedal.
• If the ABS indicator light comes on, confirm the
DTC and perform the appropriate troubleshoot-
ing for the code.
• If the ABS indicator light does not come on and
the wheel controlled by the ABS cannot be rotat-
ed, check the connection of the modulator wire
harness connectors. If the connections are OK,
replace the modulator unit.
NOTE: The kickback should occur approximately 20
seconds after the Start Test switch is pushed.
11. Turn the Mode Selector switch to "3", "4" and "5".
Perform step 10 for each of the test mode positions.
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ABS Function Test (cont'd)
Operation Sequence Simulated by Modes of ALB Checker
NOTE: The wheel sensors and sensor wire harnesses are not checked by the ALB checker.
Mode 1: Sends the simulated driving signal 0 mph (0 km/h) 113 mph (180 km/h)
0
mph (0 km/h) of each wheel to the
ABS control unit to check the system under the normal driving. There should be no kickback.
SIMULATED DRIVING SIGNAL
Mode 2: Sends the driving signal of each wheel, then sends the lock signal of the left-rear wheel to the ABS control unit to
check the system under left-rear wheel lock. There should be kickback.
SIMULATED DRIVING SIGNAL
Mode 3: Sends the driving signal of each wheel, then sends the lock signal of the right-rear wheel to the ABS control unit
to check the system under right-rear wheel lock. There should be kickback.
SIMULATED DRIVING SIGNAL
Inspection Points
If the ABS indicator light comes on and the system stops during the inspection, confirm the DTC and perform the appro-
priate troubleshooting for the code.
If there is no kickback in modes 2 through 5, and the ABS indicator light does not come on, the following items are proba-
ble causes:
Pressure switch stuck ON
Clogged or stuck solenoid outlet valve
Modulator wire harness connectors improperly connected
Mode 5: Sends the driving signal of each wheel, then sends the lock signal of the right-front wheel to the ABS control unit
to check the system under right-front wheel lock. There should be kickback.
SIMULATED DRIVING SIGNAL
Mode 4: Sends the driving signal of each wheel, then sends the lock signal of the left-front wheel to the ABS control unit
to check the system under left-front wheel lock. There should be kickback.
SIMULATED DRIVING SIGNAL
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Modulator Unit
Relieving System Pressure
CAUTION:
Be sure to relieve system pressure completely before
performing the modulator function check, disposing
the modulator unit, or replacing the accumulator and
ABS pump motor replacement.
Do not spill brake fluid on the vehicle; it may damage
the paint; if brake fluid does contact the paint, wash
it off immediately with water.
Do not reuse the drained brake fluid.
Do not loosen the relief plug on the accumulator.
1. Remove the bleeder cap from the maintenance
bleeder on the modulator unit.
MAINTENANCE BLEEDER
11 N-m (1.1 kgf-m, 8 Ibf-ft)
CAP
TUBE
2. Attach a wrench to the maintenance bleeder.
3. Connect a tube of the appropriate diameter to the
maintenance bleeder, and set the other end of the
rubber tube in a suitable container.
4. While holding the tube with your hand, slowly loosen
the maintenance bleeder 1/8 to 1/4 turn to collect the
brake fluid in the container.
CAUTION: Do not loosen the maintenance bleeder
too much. The high-pressure brake fluid can burst out.
5. Tighten the maintenance bleeder to the specified
torque.
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