Initial Inspection and Diagnostic Overview

How to Troubleshoot the IMA System

Intermittent Failures

The term intermittent failure means a system may have had a failure, but it is OK now. If the IMA system indicator on the dash does not come on, check for poor connections or loose terminals at all connectors related to the circuit you are troubleshooting. If the IMA system indicator was on but then went off, the original problem may have been intermittent.

Opens and Shorts

Open and short are common electrical terms. An open is a break in a wire or at a connection. A short is an accidental connection of a wire to ground or to another wire. In simple electronics, this usually means something won't work at all. With complex electronics such as the MCM, this can mean something works, but not the way it's supposed to.

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

If the IMA system indicator stays on

1. Start the engine, and check the IMA system indicator (A).






2. If the IMA system indicator stays on, turn the ignition switch to LOCK (0), then connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.






- Turn the ignition switch to ON (II).

- Make sure the HDS communicates with the vehicle and the MCM (IMA system). If it doesn't, troubleshoot the DLC circuit DLC Circuit Troubleshooting (IMA System).

- Select IMA SYSTEM on the HDS.

- Check the diagnostic trouble code (DTC) and note it. Also check the freeze data and the on-board snapshot. Refer to the DTC troubleshooting and begin the appropriate troubleshooting procedure.

NOTE: For specific operations, refer to the user's manual that came with the HDS.

If you can't duplicate the DTC

Some of the troubleshooting requires you to reset the MCM, and try to duplicate the DTC. If the problem is intermittent and you can't duplicate the DTC, do not continue the procedure. To do so will only result in confusion and, possibly, needlessly replaced parts.

DTC Clear

1. Turn the ignition switch to ON (II). Do not start the engine.

2. Use the HDS to clear the DTC.

NOTE: For specific operations, refer to the user's manual that came with the HDS.

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

1. Clear the DTC with the HDS.

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

3. Disconnect the HDS from the DLC.

IMA Motor Rotor Position Calibration

Do the IMA motor rotor position calibration whenever any of these actions are done:

- The MCM is replaced.
- The IMA motor rotor position sensor is replaced or removed during service.
- The IMA motor is replaced.
- The engine assembly is replaced.
- The transmission is replaced.

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





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

3. Make sure the HDS communicates with the vehicle and the MCM (IMA system). If it doesn't, troubleshoot the DLC circuit DLC Circuit Troubleshooting (IMA System).

4. Select IMA SYSTEM on the HDS.

5. Select the MOTOR ROTOR POSITION CALIBRATION in the ADJUSTMENT MENU of the HDS.

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

Troubleshooting Circuits at the MCM Connectors

Special Tools Required

- Digital Multimeter KS-AHM-32-003
- Backprobe Set 07SAZ-001000A (2)
*Available through the Honda Tool and Equipment Program 888-424-6857

If DTC troubleshooting requires voltage or resistance checks at the MCM connectors, remove the MCM connectors before doing the checks.

1. Remove the IPU cover IPU Cover Removal/Installation.

2. Remove the PCU lid, the PCU busplate, and the PCU cover Service and Repair.

3. Connect the backprobe adapters (A) to the stacking patch cords (B), and connect the cords to a digital multimeter.






Substituting the MCM

Special Tools Required

- Honda Diagnostic System (HDS) tablet tester
- Honda Interface Module (HIM) and an iN workstation with the latest HDS software version
- HDS pocket tester
- GNA600 and an iN workstation with the latest HDS software version
- MVCI unit with the latest control module (CM) update software installed
Any one of the above updating tools can be used.

Use this procedure when you have to substitute a known-good MCM during a troubleshooting procedure.

1. Remove the MCM Service and Repair.

2. Install a known-good MCM.

3. Do the MOTOR ROTOR POSITION CALIBRATION in the ADJUSTMENT MENU with the HDS.

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 repair was successfully finished. The results of diagnostic tests for the DTC are displayed as:

- PASSED: The on-board diagnosis is successfully finished.
- FAILED: The on-board diagnosis has finished but failed.
- NOT COMPLETED: The on-board diagnosis was running, but it is out of the enable conditions of the DTC.