Acura CSX. Manual — part 412
SNR9AC7K801000R81XXFAAT00
SNR9AC7K801000R8111FAAT00
−
−
−
−
DTC 81-xx :
DTC 81-11:
DTC 81-52:
DTC 81-54:
DTC 81-56:
DTC 81-58:
YES
NO
YES
NO
19-153
19-153
Central Processing Unit (CPU)
Internal Circuit Malfunction
Central Processing Unit (CPU)
Internal Circuit Malfunction
Central Processing Unit (CPU)
Internal Circuit Malfunction
Central Processing Unit (CPU)
Internal Circuit Malfunction
Central Processing Unit (CPU)
Internal Circuit Malfunction
Central Processing Unit (CPU)
Internal Circuit Malfunction
: Any two-character subcode (Except these
combinations: DTC 81-11, 81-3D, 81-3E, 81-51,
81-52, 81-53, 81-54, 81-55, 81-56, 81-57, 81-58, and
81-59)
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to
ON (II) again.
4. Check for DTCs with the HDS.
If DTC 81-11, 81-3D, 81-3E, 81-51, 81-52,
81-53, 81-54, 81-55, 81-56, 81-57, 81-58, or 81-59 is
indicated at the same time, do the appropriate
troubleshooting first.
If DTC 81-11, 81-3D, 81-3E, 81-51, 81-52, 81-53,
81-54, 81-55, 81-56, 81-57, 81-58, or 81-59 is not
indicated. Replace the VSA modulator-control unit
(see page 19-171).
Intermittent failure, the system is OK at this
time.
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Test-drive the vehicle.
NOTE: Drive the vehicle on the road, not on a lift.
4. Check for DTCs with the HDS.
Replace the VSA modulator-control unit
(see page 19-171).
Intermittent failure, the system is OK at this
time.
Is DT C 81-xx indicated?
Is DT C 81-11, 81-52, 81-54, 81-56, or 81-58
indicated?
08/08/21 15:06:41 61SNR030_190_0153
01
SNR9AC7K801000R8151FAAT00
+
+
+
+
−
−
−
−
DTC 81-51:
DTC 81-53:
DTC 81-55:
DTC 81-57:
YES
NO
DTC
VSA Modulator-control Unit 37P
Connector Terminals
YES
NO
19-154
VSA System Components
VSA MODULATOR-CONTROL UNIT 37P CONNECTOR
FR
B (GRN)
RR
B (LT GRN)
RL
B (YEL)
FL
B (WHT)
Central Processing Unit (CPU)
Internal Circuit Malfunction
Central Processing Unit (CPU)
Internal Circuit Malfunction
Central Processing Unit (CPU)
Internal Circuit Malfunction
Central Processing Unit (CPU)
Internal Circuit Malfunction
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Test-drive the vehicle.
NOTE: Drive the vehicle on the road, not on a lift.
4. Check for DTCs with the HDS.
Go to step 5.
Intermittent failure, the system is OK at this
time.
5. Turn the ignition switch to LOCK (0).
6. Disconnect the VSA modulator-control unit 37P
connector (see step 2 on page 19-171).
7. Turn the ignition switch to ON (II).
8. Measure the voltage between body ground and the
appropriate VSA modulator-control unit 37P
connector terminals (see table).
81-51
No. 19
81-53
No. 22
81-55
No. 9
81-57
No. 20
Repair short to power in the wire between
the appropriate wheel speed sensor and the VSA
modulator-control unit.
Replace the VSA modulator-control unit
(see page 19-171).
Wire side of female terminals
Is DT C 81-51, 81-53, 81-55, or 81-57 indicated?
Is ther e 0.1 V or mor e?
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SNR9AC7K801000R813DFAAT00
SNR9AC7K801000R8313FAAT00
−
−
−
−
−
−
DTC 81-3D:
DTC 81-3E:
DTC 81-59:
DTC 83-13:
DTC 83-14:
YES
NO
YES
NO
YES
NO
19-155
19-155
Central Processing Unit (CPU)
Internal Circuit Malfunction
Central Processing Unit (CPU)
Internal Circuit Malfunction
Central Processing Unit (CPU)
Internal Circuit Malfunction
ECM/PCM Communication Error
ECM/PCM Communication Error
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine.
4. Turn the steering wheel from lock to lock several
times.
5. Check for DTCs with the HDS.
Replace the VSA modulator-control unit
(see page 19-171).
Intermittent failure, the system is OK at this
time.
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Test-drive the vehicle.
NOTE: Drive the vehicle on the road, not on a lift.
4. Check for DTCs with the HDS.
Go to step 5.
Intermittent failure, the system is OK at this
time. Check for loose terminals between the ECM/
PCM connector A (44P) and the VSA modulator-
control unit 37P connector. Refer to intermittent
failures troubleshooting (see page 19-98).
5. Turn the ignition switch to LOCK (0).
6. Update the ECM/PCM if it does not have the latest
software (see page 11-227), or substitute a known-
good ECM/PCM (see page 11-7).
7. Turn the ignition switch to ON (II).
8. Clear the DTC with the HDS.
9. Test-drive the vehicle.
NOTE: Drive the vehicle on the road, not on a lift.
10. Check for DTCs with the HDS.
Replace the VSA modulator-control unit
(see page 19-171).
If the ECM/PCM was updated, troubleshooting
is complete. If the ECM/PCM was substituted,
replace the original ECM/PCM (see page 11-228).
Is DT C 81-3D, 81-3E, or 81-59 indicated?
Is DT C 83-13 or 83-14 indicated?
Is DT C 83-13 or 83-14 indicated?
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SNR9AC7K801000R8421FAAT00
SNR9AC7K801000R8601FAAT00
−
−
−
−
DTC 84-21:
DTC 86-01:
YES
NO
YES
NO
19-156
19-156
VSA System Components
VSA Sensor Neutral Position not
Writing
F-CAN Bus-off Malfunction
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Do the VSA sensor neutral position memorization
(see page 19-169).
4. Turn the ignition switch to LOCK (0), then turn it to
ON (II) again.
5. Check for DTCs with the HDS.
Check for loose terminals in the VSA
modulator-control unit 37P connector. If necessary,
substitute a known-good VSA modulator-control
unit (see page 19-171), and retest.
The system is OK at this time.
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to
ON (II) again.
4. Check for DTCs with the HDS.
Go to step 5.
Intermittent failure, the system is OK at this
time. Check for loose terminals between ECM/PCM
connector A (44P) and the VSA modulator-control
unit 37P connector. Refer to intermittent failures
troubleshooting (see page 19-98).
5. Turn the ignition switch to LOCK (0).
6. Short the SCS line with the HDS.
7. Disconnect ECM/PCM connector A (44P).
8. Disconnect the VSA modulator-control unit 37P
connector (see step 2 on page 19-171).
Is DT C 84-21 indicated?
Is DT C 86-01 indicated?
08/08/21 15:06:41 61SNR030_190_0156
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