DTC U0038: IMA-CAN Malfunction (BUS-OFF); DTC U1205: IMA-CAN Malfunction (Powertrain Control Module (PCM)-Motor Control Module (MCM))

NOTE:

Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
If DTC U0110 is stored at the same time as DTC U0038/U1205, troubleshoot that DTC first, then recheck for DTC U0038/U1205.

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II).
Check for Pending or Confirmed DTCs with the HDS.
Is DTC U0038 or U1205 indicated?

YES -Go to step 6.

NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the motor control module (MCM) and the PCM.
Check for DTCs in the IMA system with the HDS.
Is DTC U0038 or U1204 indicated?

YES -Go to step 7.

NO -Go to step 37.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector C (49P).
Measure the resistance between PCM connector terminals C35 and C36.

Fig 1: Measuring Resistance Between PCM Connector Terminals C35 And C36
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 108-132 Ω?

YES -Go to step 21.

NO -
- More than 132 Ω: Go to step 11.
- Less than 108 Ω: Go to step 16.
Turn the battery module switch OFF.
Remove the IPU cover (see IPU COVER REMOVAL/INSTALLATION ).
Remove the PCU lid, the PCU busplate, and the PCU cover (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ).
Disconnect motor control module (MCM) connector A (31P).
Measure the resistance between PCM connector terminal C35 (C36)* and MCM connector terminal A8 (A9)* individually.
*: IMACANL line

Fig 2: Measuring Resistance Between PCM Connector Terminal C35 (C36) And MCM Connector Terminal A8 (A9)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 1.0 Ω or less?

YES -Replace the MCM (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ), then go to step 32.

NO -Repair an open in the wires between the PCM (C35 (C36)") and the MCM (A8 (A9)'), then go to step 32.
Turn the battery module switch OFF.
Remove the IPU cover (see IPU COVER REMOVAL/INSTALLATION ).
Remove the PCU lid, the PCU busplate, and the PCU cover (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ).
Disconnect motor control module (MCM) connector A (31P).
Measure the resistance between PCM connector terminals C35 and C36.

Fig 3: Measuring Resistance Between PCM Connector Terminals C35 And C36
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 1.0 Ω or more?

YES -Replace the MCM (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ) then go to step 32.

NO -Repair a short in the wires between the PCM (C35) and the MCM (A8), or between the PCM (C36) and the MCM (A9), then go to step 32.
Turn the battery module switch OFF.
Remove the IPU cover (see IPU COVER REMOVAL/INSTALLATION ).
Remove the PCU lid, the PCU busplate, and the PCU cover (see MOTOR CONTROL MODULE (MCM) REMOVAL/INSTALLATION ).
Disconnect motor control module (MCM) connector A (31P).
Measure the resistance between body ground and PCM connector terminals C35 and C36 individually.

Fig 4: Measuring Resistance Between Body Ground And PCM Connector Terminals C35 And C36
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 1.0 Ω or more?.

YES -Go to step 26.

NO -Repair a short in the wires between the PCM (C35) and the MCM (A8), or between the PCM (C36) and the MCM (A9), then go to step 32.
Turn the ignition switch to ON (II).
Measure the voltage between body ground and PCM connector terminals C35 and C36 individually.

Fig 5: Measuring Voltage Between Body Ground And PCM Connector Terminals C35 And C36
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there voltage?

YES -Repair a short to power in the wires between the PCM (C35) and the MCM (A8), or between the PCM (C36) and the MCM (A9), then go to step 31.

NO -Go to step 28.
Turn the ignition switch to LOCK (0).
Reconnect PCM connector C (49P).
Measure the resistance between MCM connector terminals A8 and A9.

Fig 6: Measuring Resistance Between MCM Connector Terminals A8 And A9
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 108-132 Ω?

YES -Go to step 35.

NO -Replace the PCM (see PCM REPLACEMENT ), then go to step 32.
Turn the ignition switch to LOCK (0).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Check for Pending or Confirmed DTCs with the HDS.
Is DTC U0038 or DTC U1205 indicated?

YES -Check for poor connections or loose terminals at the MCM and the PCM, then go to step 1.

NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC'S TROUBLESHOOTING .
Reconnect all connectors.
Turn the ignition switch to ON (II).
Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
Check for Pending or Confirmed DTCs with the HDS.
Is DTC U0038 or DTC U1205 indicated?

YES -Check for poor connections or loose terminals at the MCM and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the PCM was substituted, go to step 1.

NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC'S TROUBLESHOOTING .