DLC Circuit Troubleshooting

WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Make sure the HDS and its DLC cable are working properly.
If the IMA battery level indicator displays no level, start the engine, and hold it between 3,500 and 4,000 rpm without load (in P or N) until the level in the indicator is half full.

Turn the ignition switch to LOCK (0).
Connect the HDS to the DLC (see GENERAL TROUBLESHOOTING INFORMATION ).
Turn the ignition switch to ON (II), and read the HDS.
Does the HDS identify the vehicle?

YES -go to step 4.

NO -Do the DLC circuit troubleshooting (see DLC CIRCUIT TROUBLESHOOTING ).
Check the No. 42 +B IMA 1 (10 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?

YES -go to step 5.

NO -Repair a short in the wire between the No. 42 +B IMA (10 A) fuse and the MCM (A1). Also replace the No. 42 +B IMA 1 (10 A) fuse.
Turn the ignition switch to LOCK (0).
Turn the battery module switch OFF (see DISCONNECTING THE MOTOR POWER CABLE CONNECTOR FROM THE MOTOR STATOR ).
Remove the IPU cover (see IPU COVER REMOVAL/INSTALLATION ).
Turn the battery module switch ON (see DISCONNECTING THE MOTOR POWER CABLE CONNECTOR FROM THE MOTOR STATOR ).
Turn the ignition switch to ON (II), and listen for a clicking sound from MCM relay 1 (A).

Fig 1: Identifying MCM Relay 1
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there a clicking sound?

YES -go to step 10.

NO -go to step 25.
Turn the ignition switch to LOCK (0).
Remove MCM relay 1.
Check MCM relay 1 (see POWER RELAY TEST ).
Is the relay OK?

YES -go to step 13.

NO -Replace MCM relay 1.
Turn the ignition switch to ON (II).
Measure the voltage between MCM relay 1 4P connector terminal No. 2 and body ground.

Fig 2: Measuring Voltage Between MCM Relay 1 4P Connector Terminal 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -go to step 15.

NO -Repair an open in the wire between the No. 42 + B IMA (10 A) fuse and MCM relay 1.
Turn the ignition switch to LOCK (0).
Reinstall MCM relay 1 (A).

Fig 3: Identifying MCM Relay 1
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the PCU lid, the PCU busplate, and the PCU cover (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ).
Turn the ignition switch to ON (II).
Measure the voltage between MCM connector terminals A1 and A4.

Fig 4: Measuring Voltage Between MCM Connector Terminals A1 And A4
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -go to step 20.

NO -go to step 24.
Turn the ignition switch to LOCK (0).
Disconnect MCM connector A (31P).
Check for continuity between MCM connector terminal A30 and DLC terminal No. 6.

Fig 5: Checking Continuity Between MCM Connector Terminal A30 And DLC Terminal No. 6
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -go to step 23.

NO -Repair an open in the wire between DLC terminal No. 6 and the MCM (A30).
Check for continuity between MCM connector terminal A31 and DLC terminal No. 14.

Fig 6: Checking Continuity Between MCM Connector Terminal A31 And DLC Terminal No. 14
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Update the MCM if it does not have the latest software (see MOTOR CONTROL MODULE (MCM) UPDATE ), or substitute a known-good MCM (see SUBSTITUTING THE MCM ), and recheck. If the symptom goes away with a known-good MCM, replace the original MCM (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ).

NO -Repair an open in the wire between DLC terminal No. 14 and the MCM(A31).
Measure the voltage between MCM connector terminal No. 1 and body ground.

Fig 7: Measuring Voltage Between MCM Connector Terminal 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Repair an open in the wire between the MCM (A4) and G901.

NO -Repair an open in the wire between the MCM (A4) and MCM relay 1.
Turn the ignition switch to LOCK (0).
Remove MCM relay 1.
Check MCM relay 1 (see POWER RELAY TEST ).
Is the relay OK?

YES -go to step 28.

NO -Replace MCM relay 1.
Turn the ignition switch to ON (II).
Measure the voltage between MCM relay 1 4P connector terminal No. 4 and body ground.

Fig 8: Measuring Voltage Between MCM Relay 1 4P Connector Terminal 4 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -go to step 30.

NO -Repair an open in the wire between the No. 42 + B IMA (10 A) fuse and MCM relay 1.
Turn the ignition switch to LOCK (0).
Reinstall MCM relay 1 (A).

Fig 9: Identifying MCM Relay 1
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the PCU lid, the PCU busplate, and the PCU cover (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ).
Turn the ignition switch to ON (II).
Measure the voltage between MCM connector terminal A7 and body ground.

Fig 10: Measuring Voltage Between MCM Connector Terminal A7 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -go to step 35.

NO -Repair an open in the wire between MCM relay 1 and the MCM (A7).
Turn the ignition switch to LOCK (0).
Disconnect MCM connector A (31P).
Check for continuity between MCM connector terminal A4 and body ground.

Fig 11: Checking Continuity Between MCM Connector Terminal A4 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -go to step 38.

NO -Repair an open in the wire between the MCM (A4) and G901.
Turn the ignition switch to ON (II).
Measure the voltage between MCM connector terminal A3 and body ground.

Fig 12: Measuring Voltage Between MCM Connector Terminal A3 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -go to step 40.

NO -Repair an open in the wire between the No. 22 METER (7.5 A) fuse and the MCM (A3).
Measure the voltage between MCM connector terminal A2 and body ground.

Fig 13: Measuring Voltage Between MCM Connector Terminal A2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Update the MCM if it does not have the latest software (see MOTOR CONTROL MODULE (MCM) UPDATE ), or substitute a known-good MCM (see SUBSTITUTING THE MCM ), and recheck. If the symptom goes away with a known-good MCM, replace the original MCM (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ).

NO -Repair an open in the wire between the No. 1 BACK UP (15 A) fuse and the MCM (A2).