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Acura CSX. Manual - part 281

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DTC U0028:

YES

14-205

F-CAN Malfunction (BUS-OFF

(PCM))

NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot with the HDS, and review
General Troubleshooting Information (see page 14-3).

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Check for Temporary DTCs or DTCs in the PGM-FI

SYSTEM with the HDS.

Go to the DTC U0028 troubleshooting in the

PGM-FI SYSTEM (see page 11-183).

Go to step 4.

4. Check for Temporary DTCs or DTCs in the A/T

SYSTEM with the HDS.

Go to step 5.

Intermittent failure, the system is OK at this

time. If any other Temporary DTCs or DTCs were
indicated, go to the indicated DTC’s
troubleshooting.

5. Update the PCM if it does not have the latest

software (see page 11-227), or substitute a known-
good PCM (see page 11-7).

6. Start the engine, and wait for at least 2 minutes.

7. Check for Temporary DTCs or DTCs in the A/T

SYSTEM with the HDS.

Check for poor connections or loose

terminals at the PCM. If the PCM was updated,
substitute a known-good PCM (see page 11-7), then
go to step 6. If the PCM was substituted, go to step
1.

Go to step 8.

8. Monitor the OBD STATUS for U0028 in the DTCs

MENU with the HDS.

If the PCM was updated, troubleshooting is

complete. If the PCM was substituted, replace the
original PCM (see page 11-228). If any other
Temporary DTCs or DTCs were indicated in step 7,
go to the indicated DTC’s troubleshooting.

If the HDS indicates FAILED, check for poor

connections or loose terminals at the PCM. If the
PCM was updated, substitute a known-good PCM
(see page 11-7), then go to step 6. If the PCM was
substituted, go to step 1. If the HDS indicates NOT
COMPLETED, go to step 6.

Is DT C U0028 indicated in the PGM-F I SY ST EM?

Is DT C U0028 indicated in the A/ T SY ST EM?

Does the HDS indicate PASSED?

08/08/21 14:45:31 61SNR030_140_0207

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−

DTC U0122:

YES

14-206

Automatic Transmission

F-CAN Malfunction (PCM-VSA

Modulator-Control Unit)

NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot with the HDS, and review
General Troubleshooting Information (see page 14-3).

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Check for Temporary DTCs or DTCs in the PGM-FI

SYSTEM with the HDS.

Go to the DTC U0122 troubleshooting in the

PGM-FI SYSTEM (see page 11-184).

Go to step 4.

4. Check for Temporary DTCs or DTCs in the A/T

SYSTEM with the HDS.

Go to step 5.

Intermittent failure, the system is OK at this

time. If any other Temporary DTCs or DTCs were
indicated, go to the indicated DTC’s
troubleshooting.

5. Update the PCM if it does not have the latest

software (see page 11-227), or substitute a known-
good PCM (see page 11-7).

6. Start the engine, and wait for at least 2 minutes.

7. Check for Temporary DTCs or DTCs in the A/T

SYSTEM with the HDS.

Check for poor connections or loose

terminals between the VSA modulator-control unit
and the PCM. If the PCM was updated, substitute a
known-good PCM (see page 11-7), then go to step
6. If the PCM was substituted, go to step 1.

Go to step 8.

8. Monitor the OBD STATUS for U0122 in the DTCs

MENU with the HDS.

If the PCM was updated, troubleshooting is

complete. If the PCM was substituted, replace the
original PCM (see page 11-228). If any other
Temporary DTCs or DTCs were indicated in step 7,
go to the indicated DTC’s troubleshooting.

If the HDS indicates FAILED, check for poor

connections or loose terminals between the VSA
modulator-control unit and the PCM. If the PCM
was updated, substitute a known-good PCM
(see page 11-7), then go to step 6. If the PCM was
substituted, go to step 1. If the HDS indicates NOT
COMPLETED, go to step 6.

Is DT C U0122 indicated in the PGM-F I SY ST EM?

Is DT C U0122 indicated in the A/ T SY ST EM?

Does the HDS indicate PASSED?

08/08/21 14:45:31 61SNR030_140_0208

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−

DTC U0155:

YES

14-207

F-CAN Malfunction (PCM-Gauge

Control Module)

NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot with the HDS, and review
General Troubleshooting Information (see page 14-3).

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Check for Temporary DTCs or DTCs in the PGM-FI

SYSTEM with the HDS.

Go to the DTC U0155 troubleshooting in the

PGM-FI SYSTEM (see page 11-188).

Go to step 4.

4. Check for Temporary DTCs or DTCs in the A/T

SYSTEM with the HDS.

Go to step 5.

Intermittent failure, the system is OK at this

time. If any other Temporary DTCs or DTCs were
indicated, go to the indicated DTC’s
troubleshooting.

5. Update the PCM if it does not have the latest

software (see page 11-227), or substitute a known-
good PCM (see page 11-7).

6. Start the engine, and wait for at least 2 minutes.

7. Check for Temporary DTCs or DTCs in the A/T

SYSTEM with the HDS.

Check for poor connections or loose

terminals between the gauge control module and
the PCM. If the PCM was updated, substitute a
known-good PCM (see page 11-7), then go to step
6. If the PCM was substituted, go to step 1.

Go to step 8.

8. Monitor the OBD STATUS for U0155 in the DTCs

MENU with the HDS.

If the PCM was updated, troubleshooting is

complete. If the PCM was substituted, replace the
original PCM (see page 11-228). If any other
Temporary DTCs or DTCs were indicated in step 7,
go to the indicated DTC’s troubleshooting.

If the HDS indicates FAILED, check for poor

connections or loose terminals between the gauge
control module and the PCM. If the PCM was
updated, substitute a known-good PCM (see page
11-7), then go to step 6. If the PCM was substituted,
go to step 1. If the HDS indicates NOT COMPLETED,
go to step 6.

Is DT C U0155 indicated in the PGM-F I SY ST EM?

Is DT C U0155 indicated in the A/ T SY ST EM?

Does the HDS indicate PASSED?

08/08/21 14:45:31 61SNR030_140_0209

−

０１

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14-208

Automatic Transmission

Road Test

1. Apply the parking brake, and block both rear

wheels.

2. Start the engine, and warm it up to normal

operating temperature (the radiator fan comes on).

3. Shift to D while pressing the brake pedal. Press the

accelerator pedal, and release it suddenly. The
engine should not stall.

4. Repeat step 3 in all shift lever positions.

5. Connect the HDS to the DLC (A) located under the

driver’s side of the dashboard.

6. Turn the ignition switch to ON (II), and go to the A/T

Data List. Make sure the HDS communicates with
the PCM. If it does not, go to the DLC circuit
troubleshooting (see page 11-204).

7. Prepare the HDS to take a HIGH SPEED SNAPSHOT

(refer to the HDS user guide for more details if
needed):

• Select High Speed icon.
• Select these parameters:

– Vehicle Speed
– Output Shaft (Countershaft) Speed (rpm)
– Input Shaft (Mainshaft) Speed (rpm)
– Engine Speed
– APP Sensor A (V)
– ATF Temp Sensor (V)
– Battery Voltage
– Shift Control
– Brake Switch

• Set the Trigger Type to Parameter.
• Adjust the Parameter setting to APP Sensor A

above 1.2 V.

• Set the recording time to 60 seconds.
• Set the Trigger point to

30 seconds.

8. Find a suitable level road. When you are ready to

do the test, press OK on the HDS.

9. Monitor the HDS and accelerate quickly until the

APP Sensor A reads 1.3 V. Maintain a steady
throttle until the transmission shifts to 5th gear,
then slow the vehicle and come to a stop.

10. Save the snapshot if the entire event was recorded

or increase the recording time setting as necessary
and repeat step 9.

11. Adjust the Parameter setting to 2.4 V. Retest-drive

the vehicle. While monitoring the HDS, accelerate
quickly until the APP Sensor A reads 2.5 V.
Maintain a steady throttle until the transmission
shifts to 5th gear (or reasonable speed), then slow
the vehicle and come to a stop.

12. Save the snapshot if the entire event was recorded

or increase the recording time setting as necessary
and repeat step 11.

13. Accelerate quickly until the accelerator pedal is to

the floor. Maintain a steady pedal until the
transmission shifts to 3rd gear, then slow to a stop,
and save the snapshot.

08/08/21 14:45:32 61SNR030_140_0210

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