Honda Civic. Manual — part 233

9. Test-drive the vehicle with the shift lever in D, and let the transmission shift

through all five gears.

10. Turn the ignition switch to LOCK (0). Repeat the test-drive in step 9, then go

to step 11.

11. Check for DTCs with the HDS.

Is DTC P1747 indicated?

YES -Go to step 4.

NO -Go to step 12.

12. Monitor the OBD STATUS for P1747 in the DTCs MENU with the HDS.

Does the HDS indicate PASSED?

YES -Troubleshooting is complete. If any other DTCs were indicated in step
11, go to the INDICATED DTC'S TROUBLESHOOTING.

NO -If the HDS indicates FAILED, go to step 4. If the HDS indicates NOT
COMPLETED, go to step 9.

DTC P1780: Problem in Shift Control System

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Test-drive the vehicle with the shift lever in D, and let the transmission shift

through all five gears.

4. Turn the ignition switch to LOCK (0). Repeat the test-drive in step 3, then go

to step 5.

5. Check for other DTCs indicated along with DTC P1780 with the HDS.

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)

Are there other DTCs?

YES -Go to the INDICATED DTC'S TROUBLESHOOTING.

NO -Go to step 6.

6. 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 ).

7. Test-drive the vehicle with the shift lever in D, and let the transmission shift

through all five gears.

8. Turn the ignition switch to LOCK (0). Repeat the test-drive in step 7, then go

to step 9.

9. Check for DTCs with the HDS.

Is DTC P1780 indicated?

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 7. If the PCM was substituted, go to step 1.

NO -Go to step 10.

10. Monitor the OBD STATUS for P1780 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 9, 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

NOTE:

DTC P1780 means there is one or more A/T DTCs
regarding the shift control system.

2008 Honda Civic LX

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

(see SUBSTITUTING THE PCM ), then go to step 7. If the PCM was
substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step
7.

DTC P2122: Accelerator Pedal Position (APP) Sensor A (Throttle Position Sensor D) Circuit Low Voltage Input

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 P2122 indicated in the PGM-FI SYSTEM?

YES -Go to the DTC P2122 troubleshooting in the electronic throttle control
system (ETCS) (see DTC P2122: APP SENSOR A (THROTTLE
POSITION SENSOR D) CIRCUIT LOW VOLTAGE ).

NO -Go to step 4.

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

Is DTC P2122 indicated in the A/T SYSTEM?

YES -Go to step 5.

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. Turn the ignition switch to ON (II).
7. Clear the DTC with the HDS.

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)

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

Is DTC P2122 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 8. If the PCM was substituted, go to step 1.

NO -Go to step 10.

10. Monitor the OBD STATUS for P2122 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 9, 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 8. If the PCM was
substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step
8.

DTC P2123: Accelerator Pedal Position (APP) Sensor A (Throttle Position Sensor D) Circuit High Voltage Input

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.

NOTE:

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

2008 Honda Civic LX

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