Acura RL (1996-2004 year). Manual — part 509
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Troubleshooting
DTC 1-4: Pressure Switch
The ABS control unit momentarily activates the outlet solenoid valve and counts the number of times that the pressure
switch signal is ON during the initial diagnosis. When the ABS control unit does not detect the pressure switch OFF signal
at all when the engine is started and stopped repeatedly, it keeps the ABS indicator light on. The count of the pressure
switch ON signals is reset when the ABS control unit detects the pressure switch OFF signal.
Possible causes:
Short to body ground between the ABS control unit and pressure switch
Pressure switch stuck ON
Faulty ABS control unit
MODULATOR UNIT 14P CONNECTOR
Wire side of female terminals
Visually inspect the modulator
wire harness. If the harness is
OK, replace the modulator unit.
(Pressure switch stuck ON)
ABS CONTROL UNIT 26P CONNECTOR
NOTE: Check with the modulator unit HP
connector disconnected.
Repair short to body ground in
the wire between the ABS control
unit and modulator unit.
Wire side of female terminals
Check for loose ABS control unit
connectors. If necessary, substi-
tute a known-good ABS control
unit and recheck.
Is there continuity?
Check for a short to body ground
in the P-SW circuit:
1. Disconnect the ABS control
unit 26P connector.
2. Check for continuity between
terminal No. 19 and body
ground.
Check the pressure switch:
1. Relieve system pressure (see
).
2. Disconnect the modulator unit
14P connector.
3. Check for continuity between
terminals No. 4 and No. 11.
Is there continuity?
With engine running, ABS indi-
cator light is ON.
With the SCS service connec-
tor connected (see page
),
DTC 1-4 is indicated.
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DTC 1-8: High-Pressure System
When the ABS control unit detects the pressure switch OFF signal during the initial diagnosis, it drives the ABS pump motor
until the pressure switch turns ON. Then, it momentarily activates the outlet solenoid valve and monitors the pressure switch
signal. The ABS control unit keeps the ABS indicator light on if it detects the pressure switch OFF signal at this time.
Possible causes:
Accumulator gas leakage
Changed relief valve set pressure
Rear outlet solenoid valve late to close
Changed pressure switch set pressure
RELIEF PLUG
ACCUMULATOR
Is the plug OK?
Replace the accumulator.
Problem verification:
Start the engine and allow it to run
until the ABS indicator light goes
off, then stop the engine.
Repeat this procedure 10 times.
NOTE: If there is a problem, the ABS pump
motor should operate the second or third time
you start the engine. The ABS pump motor
operates for a short time.
Does the ABS indicator light go off
each time the engine is started?
Intermittent failure, the system is
OK at this time.
).
Is code 1-8 indicated?
Perform the appropriate trou-
bleshooting flowchart for the
code.
Replace the accumulator.
(Accumulator gas leakage)
Replace the modulator unit if the
symptom appears again.
Relief valve set pressure
out of spec.
Rear outlet solenoid valve
late to close.
Pressure switch set pres-
sure out of spec.
NOTE: A normal accumulator will discharge
35 - 45 (1.3 - 1.7 fl-oz, 1.2-1.6 Imp-oz) of
fluid when you relive system pressure.
With engine running, ABS indi-
cator light is ON.
With the SCS service connec-
tor connected (see page
),
DTC 1-8 is indicated.
Check the accumulator relief plug.
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Troubleshooting
DTC 2-1: Parking Brake
The ABS control unit monitors the parking brake signal during the regular diagnosis (during driving).
It turns the ABS indicator light on if it detects the parking brake ON signal for 30 seconds.
Possible causes:
Driving with the parking brake applied
Low fluid level in the master cylinder reservoir
Blown brake system light bulb
Open circuit or short to body ground between the brake system light and ABS control unit
Parking brake switch stuck ON
Short to body ground between the brake system light and parking brake switch
Brake fluid level switch stuck ON
Short to body ground between the brake system light and brake fluid level switch
Faulty ABS control unit
Does the brake system light
come on?
Check for an open in the IG1 cir-
cuit:
1. Disconnect the gauge assem-
bly 22P connector.
2. Measure the voltage between
terminal No. 22 and body
ground.
Is there battery voltage?
Check the brake system light bulb.
Is the bulb OK?
GAUGE ASSEMBLY 22P CONNECTOR
Meter relay stuck OFF.
Repair open in the wire between
the METER (15 A) fuse in the
under-hood fuse/relay box and
gauge assembly.
Repair open in the wire be-
tween the METER (7.5 A) fuse
in the under-dash fuse/relay
box and body ground.
Replace the brake system light
bulb.
With engine running, ABS indi-
cator light is ON.
With the SCS service connec-
tor connected (see page
),
DTC 2-1 is indicated.
Check the brake system light
power source:
1. Turn the ignition switch ON (II).
2. Press the parking brake pedal.
Wire side of female terminals
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Check the gauge assembly:
1. Connect the gauge assembly
22P connector.
2. Connect the gauge assembly
30P connector terminal No. 5
to body ground with a jumper
wire.
GAUGE ASSEMBLY 30P CONNECTOR
JUMPER WIRE
Wire side of female terminals
Does the brake system light
come on?
Replace the printed circuit board
in the gauge assembly.
Repair open in the wire between
the gauge assembly and parking
brake switch.
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