Acura RL (1996-2004 year). Manual — part 282
Electrical Troubleshooting
Troubleshooting Flowchart — Vehicle Speed Sensor (VSS)
• OBD II Scan Tool indicates Code
P0501.
• Self-diagnosis indicator light
blinks four times.
Possible Cause
• Disconnected vehicle speed
sensor (VSS) connector
• Short or open in VSS wire
• Faulty VSS
Check that the speedometer oper-
ates correctly.
Does the speedometer operate?
Refer to
for vehicle
speed sensor (VSS) test.
YES
• Make sure lifts, jacks and safety stands are placed properly (see
• Set the parking brake securely, and block the rear wheels.
• Jack up the front of the vehicle, and support it with safety stands.
Does O V and approx. 5 V or more
appear alternately?
YES
Check for open in the wire
between the B13 terminal and
the vehicle speed sensor (VSS). If
wire is OK, check the VSS (see
Check for loose PCM connectors.
If necessary, substitute a known-
good PCM and recheck.
Check the VSS Voltage:
1. Turn the ignition switch OFF.
2. Raise the vehicle.
3. Shift the transmission to
position.
4. Disconnect the A (26P) and B
(16P) connectors from the
PCM.
5. Turn the ignition switch ON (II).
6. Rotate the front wheel and
check for the voltage between
the B13 and A26 terminals.
NOTE: Block the other wheel
so it does not turn or you will
get incorrect test results.
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Troubleshooting Flowchart — Transmission Range (A/T Gear Position)
Switch (Short)
• OBD II Scan Tool indicates Code
P0705.
• Self-diagnosis indicator light
blinks five times.
Possible Cause
• Short in transmission range
switch wire
• Faulty transmission range switch
NOTE: Code P0705 (5-2) is caused when
the PCM receives two gear position
inputs at the same time.
Observe the A/T Gear Position
Indicator:
1. Turn the ignition switch ON (II).
2. Observe the A/T gear position
indicator, and shift each posi-
tion separately.
Does any indicator stay on
when the shift lever is not in
that position?
The system is OK at this time.
Check the wire harness for dam-
age.
YES
Disconnect the transmission
range switch connector.
Do all gear position indica-
tors go out?
Replace the transmission range
switch.
NO
Measure ATP R Voltage:
1. Shift to all positions other
than
2. Measure the voltage between
the E7 and A26 terminals.
LG1 (BRN/BLK)
Is there approx. 10V?
NO
YES
To page
Check for short in the wire
between the E7 terminal and the
transmission range switch or A/T
gear position indicator. If wire is
OK, check for loose PCM connec-
tors. If necessary, substitute a
known-good PCM and recheck.
(cont'd)
14-9
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Electrical Troubleshooting
Troubleshooting Flowchart Transmission Range (A/T Gear Position)
Switch (Short)
From page
Is there approx.
NO
YES
Measure ATP D4 Voltage:
1. Shift to all positions other than
2. Measure the voltage between
the E8 and A26 terminals.
Is there approx.
NO
YES
Measure ATP
Voltage:
1. Shift to all positions other
than
2. Measure the voltage between
the E9 and A26 terminals.
Is there approx.
NO
YES
To page
Check for short in the wire
between the E24 terminal and the
A/T gear position indicator, or a
short in the wires between the
A/T gear position indicator and
the transmission range switch. If
wires are OK, check for loose PCM
connectors. If necessary, substi-
tute a known-good PCM and
recheck.
Check for short in the wire
between the E8 terminal and the
transmission range switch. If wire
is OK, check for loose PCM con-
nectors. If necessary, substitute
a known-good PCM and recheck.
Check for short in the wire
between the E9 terminal and the
transmission range switch or A/T
gear position indicator. If wire is
OK, check for loose PCM connec-
tors. If necessary, substitute a
known-good PCM and recheck.
Measure ATP PN Voltage:
1. Shift to all positions other
than or
2. Measure the voltage between
the E24 and A26 terminals.
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Measure ATP 2 Voltage:
Shift to all positions other than
2. Measure the voltage between
the E10 and A26 terminals.
Is there approx.
NO
YES
Measure ATP 1 Voltage:
1. Shift to all positions other than
2. Measure the voltage between
the E11 and
terminals.
Is there approx. 10 V?
NO
YES
Check for loose PCM connectors.
If necessary, substitute a known-
good PCM and recheck.
Check for short in the wire
between the E10 terminal and the
transmission range switch or A/T
gear position indicator. If wire is
OK, check for loose PCM
tors. If necessary, substitute a
known-good PCM and recheck.
Check for short in the wire
between the E11 terminal and the
transmission range switch or A/T
gear position indicator. If wire is
OK, check for loose PCM connec-
tors. If necessary, substitute a
known-good PCM and recheck.
Main Menu
Table of Contents
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