Service Manual Update: Troubleshooting Guidelines Update (19-112)

Publication date: 2019-10-29
Reference number: 19-112

SERVICE MANUAL UPDATE: TROUBLESHOOTING GUIDELINES UPDATE

TECHNICAL SERVICE BULLETIN

Reference Number(s): 19-112, Date of Issue: October 29, 2019

HONDA:

All Models

AFFECTED VEHICLES

Year	Model
ALL	ALL

BACKGROUND

The troubleshooting guidelines were updated.

Before Troubleshooting

Check applicable fuses in the appropriate fuse/relay box.
Check that the 12-volt battery has a full charge, is not damaged, and has clean and tight connections.
NOTE:
- Always follow approved charging methods and procedures outlined in approved service information.
- Never attempt to crank the engine with the 12-volt battery ground cable loosely connected, or you will severely damage the wiring.

How to Use the i-HDS

NOTE: For specific system operation, refer to the i-HDS user's manual.

If any system indicators stay on, turn the ignition to OFF, and connect the i-HDS to the data link connector (DLC).
Turn the ignition to ON.
Make sure the i-HDS communicates with the vehicle. If it does not, go to the DLC circuit troubleshooting.
Always do an all DTC check and note the results. Check for any freeze data and on-board snapshots data if they are available; then refer to the applicable DTC troubleshooting.

Intermittent Failures

The term Intermittent Failure means a system may have had a failure, but it checks OK now. When a DTC troubleshooting results in an intermittent failure, try to reproduce the failure under the same conditions with the on-board snapshot if the on-board snapshot has been recorded.

If you cannot reproduce the condition, check for loose connections and terminals. Also, check ground and power connections related to the circuit that you are troubleshooting.

Service Information

Periodically, new software or new service procedures may become available. Always check online for the latest software or service information related to the DTCs or symptoms you are troubleshooting.

Five-Step Troubleshooting

Verify The Concern:
- Make sure you understand and can verify the customer's concern. Troubleshooting will not work if it does not apply to the symptom, or if there is no current failure.
  NOTE: For intermittent concerns, review how often the concern occurs, and under what conditions with the customer as well as service bulletin, news, or other engineering information.
Understand The System:
- Make sure you understand how the system, components, and circuits normally operate. For certain DTCs, advanced diagnostics information is available that provides more detailed information such as the conditions that need to be present for that DTC to be set.
- Compare the operation to known good vehicles and systems if necessary. Based on the symptoms and system operation, identify potential causes of the problem.
Isolate The Problem By Testing:
- Review the potential causes and available published troubleshooting. Eliminate potential causes as possibilities using troubleshooting testing methods until a failure is found. This may include reviewing multiple symptoms for a common failure.
Fix The Problem:
- Once a failure is found, repair or replace the component(s) as needed.
Make Sure The System Works:
- Verify the concern is addressed. Operate the system under the same conditions in step 1 and confirm the symptom is corrected.

CAN Circuit Troubleshooting Information

NOTE: The F-CAN circuit described below is only applicable to vehicles equipped with CAN gateway.

Make sure the ignition is OFF.
Connect the i-HDS to the data link connector (DLC).
Turn the ignition to ON.
Make sure the i-HDS communicates with the vehicle. If it does not, refer to the DLC circuit troubleshooting in service information.
B-CAN: From the BODY ELECTRICAL SYSTEM SELECT menu, select B-CAN CONTROL UNITS INFORMATION, and then select CHECK CONNECTED CONTROL UNITS.
F-CAN: From the SYSTEM SELECT menu, select CAN Gateway, then select CHECK CONNECTED CONTROL UNITS.
Check that the electronic control units (ECUs) are communicating with the i-HDS.
- If an ECU is communicating with the i-HDS, "DETECT" will be displayed.
- If an ECU is not communicating, or the vehicle is not equipped with that ECU, "NOT AVAILABLE" will be displayed.
If a control unit is not communicating, confirm which ECUs are communicating, then refer to the B-CAN or F-CAN Communication Line in the Electrical Wiring Diagram to find the possible area of the circuit that has the problem. For example, if UNIT E is communicating but UNIT F and G are not, the most likely problem is around point A of the circuit.

END