Honda Civic. Manual — part 235

Does the HDS indicate PASSED?

YES -If the PCM was updated, troubleshooting is complete. If the PCM was
substituted, replace the original PCM (see ECM/PCM REPLACEMENT ). If
any other DTCs were indicated in step 7, go to the INDICATED DTC'S
TROUBLESHOOTING.

NO -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 SUBSTITUTING THE PCM ), then go to step 6. If the PCM was
substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step
6.

DTC U0155: F-CAN Malfunction (PCM-Gauge Control Module)

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.

Is DTC U0155 indicated in the PGM-FI SYSTEM?

YES -Go to the DTC U0155 troubleshooting in the PGM-FI system (see DTC
U0155: F-CAN MALFUNCTION (ECM/PCM-GAUGE CONTROL
MODULE) ).

NO -Go to step 4.

4. Check for DTCs in the A/T SYSTEM with the HDS.

Is DTC U0155 indicated in the A/T SYSTEM?

YES -Go to step 5.

NOTE:

Before you troubleshoot, record all freeze data and any on-
board snapshot with the HDS, and review General
Troubleshooting Information (see GENERAL
TROUBLESHOOTING INFORMATION ).

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)

NO -Intermittent failure, the system is OK at this time. If any other DTCs were
indicated, go to the INDICATED DTC'S TROUBLESHOOTING.

5. Update the PCM if it does not have the latest software (see UPDATING THE

PCM ), or substitute a known-good PCM (see SUBSTITUTING THE
PCM ).

6. Start the engine, and wait for at least 2 minutes.
7. Check for DTCs in the A/T SYSTEM with the HDS.

Is DTC U0155 indicated in the A/T SYSTEM?

YES -Check for poor connections or loose terminals at the PCM. If the PCM
was updated, substitute a known-good PCM (see SUBSTITUTING THE
PCM ), then go to step 6. If the PCM was substituted, go to step 1.

NO -Go to step 8.

8. Monitor the OBD STATUS for U0151 in the DTCs MENU with the HDS.

Does the HDS indicate PASSED?

YES -If the PCM was updated, troubleshooting is complete. If the PCM was
substituted, replace the original PCM (see ECM/PCM REPLACEMENT ). If
any other DTCs were indicated in step 7, go to the INDICATED DTC'S
TROUBLESHOOTING.

NO -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 SUBSTITUTING THE PCM ), then go to step 6. If the PCM was
substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step
6.

ROAD TEST

1. Start the engine, and warm it up to normal operating temperature (the radiator

fan comes on).

2. Apply the parking brake, and block both rear wheels.

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)

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 behind the driver's dashboard lower

cover, and go to the A/T Mode Menu.

Fig. 168: Identifying Data Link Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

6. Make sure the HDS communicates with the PCM. If it does not, go to the DLC

circuit troubleshooting (see DLC CIRCUIT TROUBLESHOOTING ).

7. Prepare the HDS to take a HIGH SPEED SNAPSHOT (Refer to the HDS

user's guide for more details if needed):

Select High Speed Snapshot.

Select these parameters:

Vehicle Speed

Output Shaft (Countershaft) Speed

Input Shaft (Mainshaft) Speed (rpm)

Engine Speed

Relative TP Sensor

APP Sensor A (V)

ATF Temp Sensor

Battery Voltage

Shift Control

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)

Brake Switch

Set the Trigger Type to Parameter.

Adjust the Parameter setting to APP Sensor A (V) above 1.3 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 2.5 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
snap shot.

14. Review each snapshot individually and compare the Shift Command, APP

Sensor A (V), and the Vehicle Speed to the table below.

Upshift: D Position

VEHICLE SPEED REFERENCE - UPSHIFT D POSITION

APP Sensor A voltage: 1.3 V
1st-->2nd

9-12 mph (15-19
km/h)

2nd-->3rd

17-21 mph (28-33
km/h)

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)