Diagnosing the 2011 Chevrolet Volt 4ET50 Transmission or outdoors.
• Use certified and up-to-date Class “0” insulation gloves, rated at 1000V, equipped with leather protec- tors.
Inspect the gloves visually and func- tionally before use.
Wear the insulated gloves at all times when working with the high voltage battery assembly, whether the system is energized or not.
Disabling the High Voltage System To disable the
high voltage system: 1. Disconnect and remove all 12V battery chargers and the AC charge cable from the hybrid bat- tery charger receptacle.
2. Remove all keyless entry trans- mitters from the vehicle and secure the transmitters in a safe place at least 50 feet from the vehicle.
3. Attempt to start the vehicle with the ignition mode switch. It should not start.
4. Disconnect the 12V battery. 5. Remove the manual-service dis- connect, located in the console (figure 5). • Place the manual disconnect in a secure place, outside the vehicle.
• Cover the exposed, high-volt- age opening with a UL-listed insulating tape rated at 600V.
6. Wait 5 minutes before continuing. This will allow the high voltage capacitors to discharge.
7. Check for voltage at the high volt- age terminals. If there’s no volt- age at the high voltage terminals: • Remove the T6 power inverter module cover. (See part 1 in the January issue of Gears for information on the power inverter module).
• Disconnect the X3 harness connector from the T6 power
14 Figure 5 inverter module.
• Wait 5 minutes before con- tinuing. This will allow the high voltage capacitors to dis- charge.
• Disconnect the X4 harness connector from the T6 power inverter module.
8. Check for voltage at the high volt- age terminals.
If the high voltage terminals have
less than 3V, it’s safe to service the vehicle.
Enabling the High Voltage System To enable the high voltage system:
1. Connect the X4 harness connector to the T6 power inverter module. 2. Connect the X3 harness connector
to the T6 power inverter module.
3. Install the T6 power inverter module cover.
4. Install the manual service discon- nect (located in the console).
5. Reconnect the 12V battery. 6. Start the vehicle. If the vehicle starts, it’s ready to
return to service. Well there you have it: We’ve
taken a brief look at the diagnostic rou- tines, reset adapts procedure, and the procedures to disable the high voltage system for the 4ET50 transmission. Look for upcoming GEARS arti-
cles where we’ll look at the rebuild pro- cedures for new 4ET50 transmission, to keep these trannys rolling.
GEARS March 2012
Figure 4
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