Eaton Fuller Hybrid Fault Code 17 Start Enable Relay (2024)

Warnings & Cautions

Danger: Danger indicates you will be severely injured orkilled if do not follow the indicated procedure.
Warning: Warning indicates an immediate hazard, whichcould result in severe personal injury if you do not followthe indicated procedure.
Caution: Caution indicates vehicle or property damagecould occur if you do not follow the indicated procedure.

Note: Note indicates additional detail that will aid in thediagnosis or repair of a component/system.

Follow the specified procedures in the indicated order to avoid personal injury:

1. If the high-voltage cones are around the vehicle and the lockout is installed on the PEC, the only person that should be allowed to start the vehicle is the person who signed the lockout tag.
2. Before working on a vehicle or leaving the cab while the engine is running, you should place the shift lever in “N” set the parking brake, and block the wheels.
3. For safety reasons, always engage the service brakes prior to selecting gear positions from “N.”
4. Before starting a vehicle always be seated in the driver’s seat, select “N” on the shift control, and set the parking brakes.
5. In vehicles with ePTO, the engine and/or
Motor/Generator can start in ePTO mode. Never perform any maintenance or work on vehicle, while in this mode.
6. 12-Volt Battery positive (+) and negative (-) must be disconnected prior to any welding on any Hybrid equipped vehicle.

Caution: Follow the specified procedures in the indicated order to avoid equipment malfunction or damage.
Caution: Do not release the parking brake or attempt toselect a gear until the air pressure is at the correct level.
Caution: To avoid damage to the transmission duringtowing place the shift lever in “N” and lift the drive wheels off the ground or disconnect the driveline.

High-Voltage Warnings & Cautions

• Use CO2 or Dry Chemical Fire Extinguishers.
• The high-voltage wiring is covered in orange insulation or convoluted tubing and marked with warning labels at the connectors.
• All Eaton® Hybrid Diesel/Electric vehicles will be marked ‘Hybrid’ on the outside of the vehicle, along with the shift label on the dash.
• Refer to OEM for specific location of chassis mounted hybrid components.
• Do NOT cut into the orange high-voltage cables.
• Do NOT cut into or open the PEC.
• Do NOT cut into or open the DC/DC Converter.
• Do NOT cut into or open the Inverter.

A buffer zone must be set up and high-voltage insulated rubber gloves (class 0 with leather protectors) are required prior to working on high-voltage. Failure to follow these instructions may result in severe personal injury or death.
The rubber-insulated gloves that must be worn while working on the high-voltage system are class 0 with leather protectors. The rubber gloves should be tested before EVERY use following the rubber insulation gloves testing procedure found in “Diagnostic Tools/Service Publications” on page 6. Failure to follow these instructions may result in severe personal injury or death.
Before inspecting or working on any high-voltage cables or components the “High-Voltage Service Shutdown and Power-Up Procedure” on page 4 should be followed. Failure to follow these instructions may result in severe personal injury or death.
The Lockout and Tagout devices should only be removed by the technician that placed the Lockout and Tagout devices on the vehicle. Failure to follow these instructions may result in severe personal injury or death.
High-voltage rubber insulated gloves (class 0 with leather protectors) must be worn when working on any
high-voltage cables. The “High-Voltage Service Shutdown and Power-Up Procedure” on page 4 must be followed prior to removing any high-voltage cables. Failure to follow these instructions may result in severe personal injury or death.
High-voltage cables and wiring are orange and contain a warning label at the connectors. High-voltage components are marked with a label. High-voltage rubber insulated gloves (class 0 with leather protectors) must be used when working on any of these components. Failure to follow these instructions may result in severe personal injury or death.

High-Voltage Service Shutdown Procedures

1. Follow “High-Voltage Work Area” procedure.
2. Locate the red PEC Service Switch on the front of the PEC and push switch off.
3. Remove the Service Switch Cover and install the Lockout Bracket (J48506).
4. Fasten tag to the Lockout Bracket.
5. Ensure the PEC Service Switch can not move from the off position.
6. Allow the system to set for a minimum of 5 minutes to discharge high voltage.
7. Connect ServiceRanger and view the Data Monitor PID 116 called “High-Voltage Battery Potential.” Use SPN 520323 for J1939 connection “Battery Voltage RB” (Relay Box).
8. The voltage should be 30 volts or less. If the voltage is above 30 volts, do not work on the vehicle and contact Eaton® at 1-800-826-HELP (4357).
9. Turn ignition key off and proceed to repair or troubleshooting step.
Note: The voltage drops to zero when the key is off.

High-Voltage Service Power-Up Procedure

1. Install all high-voltage connectors into their locked positions.
2. If you are the person working on the vehicle, remove the Lockout Bracket and tag.
3. Reinstall the Lockout Bracket over the Service Switch.
4. Pull the Service Switch out and let vehicle set for 2 minutes.
5. Start vehicle when appropriate.

Eaton Hybrid Component and Connector Location

Eaton Hybrid Component and Connector Location MY09 Systems

1. Review and follow the .
2. Retrieve Active fault codes and FMIs with ServiceRanger using the 9-Way Diagnostic Connector.
3. Exchange the current Start Enable Relay with another relay and see if fault returns:
   • If fault does not return with new relay, replace the Start Enable Relay (only if fault code is Active), then go to Step 6.
   • If fault returns with new relay, go to Step 2.

1. Which FMIs were listed from Step 1?
   • If FMI 3 is listed, go to Step 3.
   • If FMI 4 is listed, go to Step 5.

1. Key off.
2. Disconnect negative battery cable.
3. Disconnect the Transmission Harness38- way connector.
4. Measure resistance between Vehicle Harness38- Way Connector Pin 32 and Pin 4:
   • If resistance between Pin 32 and Pin 4 is 40–120 ohms, go to Step 4.
   • If resistance is outside of range, repair the Vehicle Harness for an open circuit, then go to Step 6.

1. Key on.
2. Measure voltage between Vehicle Harness 38-Way Connector Pin 32 and ground:
   Note: The voltage reads 5 volts for only 1-2 seconds
   • If the voltage between Pin 32 and ground is 5 volts, replace the Transmission Electronic Control Unit (TECU) (only if fault code is Active), then go to Step 6.
   • If the voltage between Pin 32 and ground is 12 volts, repair the short to VBATT on the harness. Voltage should remain at 5 volts for 1–2 seconds after initial key on. Go to Step 6.

1. Key off.
2. Disconnect battery cable.
3. Disconnect the Transmission Harness38- Way Connector. Measure the resistance between Vehicle Harness38- Way Connector Pin 32 and ground:
   • If the resistance between 32 and ground is 10K ohms or greater, replace the Transmission Electronic Control Unit (TECU) (only if fault code is Active), then go to Step 6.
   • If the resistance is outside of range, repair the Vehicle Harness for a short to ground, then go to Step 6.

1. Key off.
2. Reconnect all connectors and negativebattery 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 17 appears, find error in testing, go to Step 1.
   • Ifa code other than 17 appears, see Fault Code Index List.