Eaton Fuller Hybrid Transmission Fault Code 89 – Power Electric Carrier CAN Message Fault (HCM)

Fault code for Eaton Hybrid Drive Systems models (MY09) EH-8E406A-U/P, EH-8E406A-UP, EH-8E406A-UPG, EH-8E406A-CD, EH-8E406A-CDG, EH-8E406A-CDR, EH-8E406A-T, EH-6E706B-CD, EH-6E706B-P and EH-6E706B-UPG. Read below to learn how to test, clear and fix fault code errors for your Freightliner, Mack, Peterbilt, Kenworth, Volvo, International, and heavy-duty truck and equipment. The Hybrid Control Module (HCM) communicate with the Inverter communicates with the Battery Control Unit (BCU) located in the Power Electronics Carrier (PEC) and the HCM on the Controller Area Network (CAN) high-speed proprietary data link. The data link is a two-wire twisted pair with two 120 ohm resistors located in the link.

Fault Code 89 – Power Electric Carrier CAN Message Fault Detection

The following preconditions must be met before the system detects the fault:

  • HCM ignition voltage is greater than 7 volts and less than 16 volts.
  • HCM CAN data link fault is Inactive.

Note: When troubleshooting an Inactive code refer to the Product Diagnostic Mode (PDM)

Conditions to Set Fault Code Active

  • FMI 2 is only Active in Product Diagnostic Mode (PDM) and sets if 3 consecutive messages are not received by the HCM.
  • FMI 9 is set when the HCM has not received a 1 message for 30 consecutive message cycles.

Fallback When Fault Code 89 is set the following conditions occur:

  • Amber “Check Hybrid” light illuminates.
  • Fault is stored in Hybrid Control Module (HCM) memory.
  • Electric Motor/Generator Assist and Regeneration are disabled; however, the high-voltage relays remain powered.
  • HCM continues to control the Hybrid vehicle in a diesel-only mode.
  • Transmission defaults start gear to 1st.

Conditions to Set Fault Code Inactive

Only Inactive faults can be cleared from the Transmission Electronic Control Unit (TECU) or HCM history using ServiceRanger. The TECU automatically clears the faults from history after 200 hours and the HCM automatically clears the faults from history after the fault has been Inactive for 200 hours.

This fault code can be caused by any of the following:

  • FMI 2, 9
    • Inverter
    • CAN Data Link to Relay Box
    • Relay Box inside PEC
    • No power or ground to Relay Box

Fault Code 89 – Power Electric Carrier CAN Message Fault Test

Component Identification MY09 Systems:

mating connector Deustch 19-way
Inverter Deutsch 40-Pin connector

NOTE: Refer to the Eaton Hybrid Component and Connector Location for Connector Locations in MY09 Systems.

Inverter to PEC

Or optional CAN wired directly to CAN Data Link Backbone (Inverter Pins 34 and 35 are not used):

Inverter to PEC CAN Backbone

STEP 1. Check for Active or Inactive fault code status and check HCM configurations.

  1.  Retrieve Active fault codes and FMIs with ServiceRanger using the 9-Way Diagnostic Connector or manually.
  2. Perform Electrical Pretest and Hybrid Electrical Pretest.
    • If no issues are found during either electrical test, go to Step 2.
    • If issue was repaired during either electrical test, go to Step 10.

STEP 2. Verify continuity of PEC circuits.

  1. Key off.
    Danger: See High-Voltage Service Shutdown and Power-Up Procedure. Follow the procedures to avoid shock, burn or death from improperly handled high-voltage.
  2. Disconnect PEC 19-Way Connector.
  3. Measure resistance on PEC 19-Way OEM Wire Harness Connector Pin 1 and Pin 2:
    Note: Make sure the volt/ohm meter is on the proper scale (around 200 ohm scale).

    • If resistance between Pin 1 and Pin 2 is between 50–70 ohms, go to Step 3.
    • If resistance is outside of range, go to Step 7.

STEP 3. Verify CAN circuit for short to ground.

  1. Measure resistance between PEC 19-Way OEM Wire Harness Connector Pin 1 and ground and between Pin 2 and ground:
    • If either resistance is 0–100 ohms, repair OEM CAN wiring circuit. go to Step 10.
    • If both resistances are 7k ohms, go to Step 4.

STEP 4. Verify CAN is populated in correct Connector Pin.

  1. Measure resistance between PEC 19-Way Connector Pin 1 and Inverter 40-Way Connector Pin 4:
    • If resistance is 0–0.3 ohms, go to Step 5.
    • If resistance is 60 ohms, repair CAN Wiring (hi and low are wired wrong), then go to Step 10.

STEP 5. Verify power and ground to PEC.

  1. Reinstall 40-Way Connector at Inverter.
  2. Key on.
  3.  Measure for voltage on PEC 19-Way OEM Wire Harness Connector Pins 6 and 7:
    • If Pins 6 and 7 have battery voltage (12 volts +/ – 1.2 volts), replace the PEC, then go to Step 10.
    • If pins 6 and 7 have no voltage or less than 1.2 volts of battery voltage, go to Step 6.

STEP 6. Verify continuity between Inverter and PEC.

  1. Key off.
  2. Remove Inverter 40-Way Connector.40 pin connector to inverter Eaton fuller transmission
  3. Measure resistance on OEM 40-Way Inverter Connector Pin 14 to OEM 19-Way PEC Connector Pin 6 and Inverter Connector Pin 15 to PEC Connector Pin 7: 19 pin connector-40-pin-connector
    • If resistance from Pin 14 to Pin 6 is 0–0.3 ohms, and resistance from Pin 15 to Pin 7 is 0–0.3 ohms (also check terminal tension on Pins), replace the Inverter, then go to Step 7.
       If resistance is OL or outside of range, repair OEM Wire Harness between Inverter and PEC, then go to Step 10.

STEP 7. Verify CAN at PEC with Inverter.

  1. Key off.
  2. Remove Inverter 40-Way Connector.40 Way connector to inverter
  3. Check OEM Inverter Connector for Pins 34 and 35. If no pins are populated in connector, the PEC CAN Communication goes to CAN Backbone, not the Inverter:
    • If Pin 34 and Pin 35 are not populated, go to Step 9.
    • If OEM Inverter Connector has Pins 34 and 35, go to Step 8.

STEP 8. Verify continuity between Inverter circuits and PEC circuits.

  1. Measure resistance between Inverter 40-Way Connector Pin 34 and OEM 19-Way PEC Connector Pin 1 and Inverter 40-Way Connector Pin 35 and PEC 19-Way Connector Pin 2:19 pin connector-40-pin-connectorNote: Make sure the volt/ohm meter is on the proper scale (around 200 ohm scale)
    • If resistance between Pin 34 and Pin 1 is between 0–0.3 ohms, and resistance between Pin 35 and Pin 2 is between 0–0.3 ohms, replace the Inverter. See MY09 Inverter Removal and Installation), then go to Step 10.
    • If resistance is OL or outside of range, repair OEM Wire Harness between Inverter and PEC, then go to Step 10.

STEP 9. Verify continuity between PEC CAN and CAN Backbone.

  1. If the inverter 40-pin connector does not have Pins 34 and 35 populated then the CAN communication branch to 19-Way Connector at the PEC is wired directly to CAN Backbone:
    • Repair OEM Wire Harness between the PEC and the CAN Communication Backbone, then go to Step 10.

STEP 10. Verify repair.

  1. Key off.
  2. Reconnect all connectors and the negative battery cable.
  3.  Key on.
  4. Clear codes, see  Clear Inactive Faults.
  5. Drive the vehicle and attempt to reset the code.
  6. Check for codes, see View Active and Inactive Faults.
    • If no codes, test is complete.
    • If fault Code 89 appears, find error in testing, go to Step 1.
    • If a code other than 89 appears, see Fault Code Index List.

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