How to Troubleshoot A/T Systems

How to Troubleshoot A/T Systems

How to Check for DTCs with the Honda Diagnostic System (HDS)

When the powertrain control module (PCM) senses an abnormality in the input or output system, the D indicator (A) in the gauge assembly (B) will usually blink.






When the Honda Diagnostic System (HDS) is connected to the data link connector (DLC) (A) located behind the driver's dashboard lower cover, it will indicate the diagnostic trouble code (DTC) when the ignition switch is turned ON (II) and the appropriate menu is selected.






If the D indicator or malfunction indicator lamp (MIL) has been reported ON, or if a driveability problem is suspected, do this procedure:

1. Connect the HDS to the DLC. (See the HDS user's manual for specific instructions.)

2. Turn the ignition switch to ON (II). Make sure the HDS communicates with the PCM. If it does not, go to the DLC circuit troubleshooting. Testing and Inspection

3. Select A/T system, and observe the DTC in the DTCs MENU on the HDS screen.

4. Record the freeze data and on-board snapshots for all fuel and emissions DTCs and A/T DTCs.

5. If there is a fuel and emissions DTC, first check the fuel and emissions system as indicated by the DTC.

6. Clear the DTC and data.

7. Drive the vehicle for several minutes under the same conditions as those indicated by the freeze data, and then recheck for the DTC. If the A/T DTC returns, go to the indicated DTC's troubleshooting. If the DTC does not return, there was an intermittent problem within the circuit. Make sure all pins and terminals in the circuit are tight.

Symptom Troubleshooting Versus DTC Troubleshooting

Some symptoms will not trigger DTCs or cause the D indicator to blink. If the malfunction indicator lamp (MIL) was reported ON or the D indicator has been blinking, check for DTCs. If the vehicle has an abnormal symptom, and there are no DTCs stored, do the symptom troubleshooting. Check the list of probable cause(s) for the symptom, in the sequence listed, until you find the problem.

How to Check for DTCs with the SCS Mode (retrieving the flash codes)

NOTE: The preferred method is to use the HDS to retrieve the P-code.

When the PCM senses an abnormality in the input or output system, the D indicator (A) in the gauge assembly (B) will usually blink.






When the D indicator has been reported ON, connect the HDS to the DLC (A) (located behind the driver's dashboard lower cover). Turn the ignition switch to ON (II), select SCS mode, then the D indicator will indicate flash the DTC.






If the D indicator and the MIL come on at the same time, or if a driveability problem is suspected, do this:

1. Connect the HDS to the DLC. (See the HDS user's manual for specific instructions.)

2. Turn the ignition switch to ON (II), select SCS mode, then observe the D indicator in the gauge assembly.
Codes 1 through 9 are indicated by individual short blinks. Code 10 and above are indicated by a series of long and short blinks. One long blink equals 10 short blinks. Add the long and short blinks together to determine the code.

3. Record all fuel and emissions DTCs and A/T DTCs.

4. If there is a fuel and emissions DTC, first check the fuel and emissions system as indicated by the DTC (except DTC 70, which means there is one or more A/T DTCs, and no problems were detected in the fuel and emissions circuit of the PCM).

5. Clear the DTC and data.

6. Drive the vehicle for several minutes under the same conditions as those indicated by the freeze data, and then recheck for DTC. If the A/T DTC returns, go to the indicated DTC's troubleshooting. If the DTC does not return, there was an intermittent problem within the circuit. Make sure all pins and terminals in the circuit are tight.






How to Troubleshoot Circuits at the PCM Connectors

NOTE: The PCM overwrites data and monitors the EVAP system for about 15 minutes after the ignition switch is turned to LOCK (0). Jumping the SCS line after turning the ignition switch to LOCK (0) cancels this function. Disconnecting the PCM during this function, without jumping the SCS line first, can damage the PCM.

1. Connect the HDS to the DLC (A), and jump the SCS line with the HDS.

2. Inspect the circuit on the PCM, according to the DTC troubleshooting, with a commercially available digital multimeter, patch cords, and pin probes at PCM harness connectors.






3. Remove the bracket (A), then free the A/C discharge line from the clip (B). Remove the A/C suction line mounting bracket bolt (C), then remove the PCM cover (D) and disconnect PCM connectors (E).
NOTE: PCM connectors A, B, and C have symbols (A=(square), B=(triangle) , C=(circle)) embossed on them for identification.






4. Check the connector inspection port (A) size, and select a suitable pin probe.






5. Connect one end of the patch cords (A) to a digital multimeter (B), and connect the other patch cord terminal to a commercially available banana jack (Pomona Electronics Tool No. 3563 or equivalent) (C).

6. Gently slide the pin probe into the inspection port at the connector terminal side. Always use the inspection port. Do not slide the probe into the connector terminals.
NOTICE:
- For accurate results, always use the pin probe (male).

- To prevent damage to the connector terminals, do not insert test equipment probes, paper clips, or other substitutes as they can damage the terminals. Damaged terminals cause a poor connection and an incorrect measurement.

- Do not puncture the insulation on a wire. Punctures can cause poor or intermittent electrical connections.





Clear A/T DTCs Procedures

1. Connect the HDS to the DLC (A) located behind the driver's dashboard lower cover.

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

3. Make sure the HDS communications with the PCM. If it does not, go to the DLC circuit troubleshooting. Testing and Inspection

4. Clear the DTC(s) on the HDS screen.






OBD Status

The OBD status shows the current system status of each DTC and all of the parameters. This function is used to see if the technician's repair was successfully completed. The results of diagnostic tests for the DTC are displayed as:

- PASSED: On board diagnosis has successfully completed.

- FAILED: On board diagnosis has completed but failed.

- NOT COMPLETED: The on board diagnosis was running but is out of the enable conditions of the DTC.

How to End a Troubleshooting Session (required after any troubleshooting)

NOTE: Reset the PCM with the HDS while the engine is stopped.

1. Turn the ignition switch to LOCK (0).

2. Turn the ignition switch to ON (II), and wait for 30 seconds.

3. Turn the ignition switch to LOCK (0), and disconnect the HDS from the DLC.

4. Do the PCM idle learn procedure. PCM Idle Learn Procedure

5. Start the engine with the shift lever in P or N, and warm it up to normal operating temperature (the radiator fan comes on).

6. To verify that the problem is repaired, test-drive the vehicle for several minutes at speeds over 31 mph (50 km/h) or under the same conditions as those indicated by the freeze data.

Substitute the PCM

Special Tools Required

- Honda diagnostic system (HDS) tablet tester

- Honda interface module (HIM) and an iN workstation with HDS and CM update software

- HDS pocket tester

- GNA600 and an iN workstation with HDS and CM update software

Use any one of these update tools.

NOTE: Use this procedure when you have to substitute a known-good PCM during a troubleshooting procedure.

1. Connect the HDS to the data link connector (DLC) (A) located behind the driver's side of the dashboard.

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

3. Make sure the HDS communicates with the PCM. If it doesn't, go to the DLC circuit troubleshooting. Testing and Inspection If you are returning from the DLC circuit troubleshooting, skip step 5 to 6, and clean the throttle body after substituting the PCM. Procedures

4. Select the INSPECTION MENU with the HDS.

5. Select the ETCS TEST, then select the TP POSITION CHECK, and follow the HDS screen prompts.
NOTE: If the TP POSITION CHECK indicates FAILED, continue this procedure.

6. Turn the ignition switch to LOCK (0).






7. Do the battery removal procedure. Removal and Replacement

8. Remove the bracket (D), then free the A/C discharge line from the clip (E). Remove the A/C suction line mounting bracket bolt (F).

9. Remove the PCM cover (G), disconnect PCM connectors A, B, and C, and remove the mounting bolts, then remove the PCM.

10. Install the PCM and battery cables in the reverse order of removal.

11. Do the battery installation procedure. Removal and Replacement

12. Turn the ignition switch to ON (II).
NOTE: If DTC P0630 "VIN not Programmed or Mismatch" will be stored because the VIN has not been programmed into the PCM; ignore it, and continue this procedure.

13. Manually input the VIN to the PCM with the HDS.

14. Update the PCM if it does not have the latest software.

15. Select the IMMOBI SYSTEM with the HDS.

16. Enter the immobilizer code using the PCM replacement procedure in the HDS; this allows you to start the engine.

17. Reset the PCM with the HDS.

18. Select the ETCS TEST, then select the TP POSITION CHECK, and follow the HDS screen prompts. If the TP POSITION CHECK failed, clean the throttle body. Procedures

19. Do the PCM idle learn procedure. PCM Idle Learn Procedure

20. Do the CKP learn procedure. Initial Inspection and Diagnostic Overview