Acura RL (1996-2004 year). Manual — part 552
DTC 66: Pressure Sensor
Check the brake switch.
Is the switch OK?
Check for an open in the STOP
circuit:
1. Disconnect the VSA control
unit 42P connector.
2. Measure the voltage between
the VSA control unit 42P con-
nector terminal No. 32 and
body ground when the brake
pedal is pressed.
Is there battery voltage?
Is there battery voltage?
Check for a short to body ground
in the pressure sensor circuits:
1. Turn the ignition switch OFF.
2. Check for continuity between
body ground and the VSA
control unit 42P connector
terminal No. 25, No. 26 and
No. 42 individually.
Is there continuity?
Check for an open in the PSU cir-
cuit:
Check for continuity between the
VSA control unit 42P connector
terminal No. 42 and the pressure
sensor 3P connector terminal No.
1.
Is there continuity?
Replace the brake switch.
VSA CONTROL UNIT 42P CONNECTOR
Repair open in the wire between
the brake switch and the VSA
control unit.
Wire side of female terminals
Repair short to power in the wire
between the pressure sensor and
the VSA control unit.
Repair short to body ground in
the wire between the pressure
sensor and the VSA control unit.
Repair open in the wire between
the pressure sensor and the VSA
control unit.
PRESSURE SENSOR
3P CONNECTOR
Wire side of female terminals
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Troubleshooting
DTC 66: Pressure Sensor (cont'd)
Check for an open in the PSS cir-
cuit:
Check for continuity between the
VSA control unit 42P connector
terminal No. 26 and the pressure
sensor 3P connector terminal No.
2.
Is there continuity?
Check for an open in the PSM cir-
cuit:
Check for continuity between the
VSA control unit 42P connector
terminal No. 25 and the pressure
sensor 3P connector terminal No.
3.
Is there continuity?
Repair open in the wire between
the pressure sensor and the VSA
control unit.
Repair open in the wire between
the pressure sensor and the VSA
control unit.
VSA CONTROL UNIT 42P CONNECTOR
PRESSURE SENSOR
3P CONNECTOR
Wire side of female terminals
Check for loose terminals in the
VSA control unit 42P connector.
If necessary, substitute a known-
good VSA modulator-control
unit, and recheck.
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DTC 68: Brake Pedal Position Switch
Is there battery voltage?
Check for an open in the STOP
circuit:
Measure the voltage between the
VSA control unit 42P connector
terminal No. 32 and body ground
when the brake pedal is pressed.
Is there battery voltage?
Replace the brake pedal position
switch.
VSA CONTROL UNIT 42P CONNECTOR
Repair short to power in the wire
between the brake pedal position
switch and the VSA control unit.
Terminal side of female terminals
Repair open in the wire between
the brake pedal position switch
and the VSA control unit.
Check for loose terminals in the
VSA control unit 42P connector.
If necessary, substitute a known-
good VSA modulator-control
unit, and recheck.
Main Menu
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Troubleshooting
DTC 71: Abnormal Wheel Speed Signal
Are any DTCs except 71 indicated?
Check the tires.
Are tires with specified size and
inflated to specification?
Check for brake drag.
Do the brakes drag?
Visually check for appropriate
wheel sensor and pulser installa-
tion (see table).
Are they installed correctly?
Check the four pulser gears for a
chipped tooth (see table).
Is the pulser OK?
Problem Verification:
1. Clear the DTC.
2. Test-drive the vehicle at 19
mph (30 km/h) or more.
3. Verify the DTC.
Is DTC 71 indicated?
YES
Check for loose terminals in the
VSA control unit 42P connector.
If necessary, substitute a known-
good VSA modulator-control
unit, and recheck.
Preform the appropriate trou-
bleshooting for the DTC.
Replace the tire(s) with the spec-
ified size.
Repair the brake drag.
Reinstall or replace the wheel
sensor or pulser.
Replace the driveshaft or hub
unit. (Chipped pulser gear.)
The system is OK at this time.
Verify the DTC.
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