Integrated Motor Assist (IMA) System
Integrated Motor Assist (IMA) System
- The IMA (integrated motor assisted) system uses high voltage (100 V) circuits. Be sure to shut off the electrical circuits and isolate the IMA system and related parts before servicing the IMA system.
- The high voltage cables and their covers are identified by orange coloring. The caution labels are attached to high voltage and other related parts. Be careful not to touch these cables and parts without adequate protective gear.
The front floor under-cover protecting the high voltage cables is marked.
- If the 12 V battery is discharged, its cables have been disconnected, or the MCM (motor control module) has been reset, the IMA battery level indicator does not display the state-of-charge (SOC) when the engine is started. To display the level in the indicator, 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.
- Observe the following instructions when inspecting or servicing the IMA system:
- Servicing, disassembling, or replacing items marked with
in each procedure requires insulated tools.
- When the IMA system indicator is on, do the IMA system troubleshooting first.
- Wear insulated gloves whenever you inspect or service the IMA system. Be sure to check the gloves for pin holes, tears, or other damage.
- Turn the battery module switch OFF, and secure the switch in the OFF position with the locking cover before servicing the IMA system (see Turning off and on power to the high voltage circuit).
- Wait for at least 5 minutes after turning off the battery module switch, then disconnect the negative cable from the 12 V battery (it takes about 5 minutes for the PDU capacitor to discharge).
- Before disconnecting the high voltage cable terminals, use a voltmeter to make sure that the voltage between the terminals is below 30 V.
- When servicing parts without an insulated sheath, be sure to use insulated tools to prevent short circuiting.
- The rotor assembly contains very strong magnets and should be handled with special care. People with pacemakers or other magnetically sensitive medical devices should not handle the rotor assembly.
- Use the special tool (rotor puller) to remove or install the rotor assembly.
WARNING: If the rotor is installed by hand, it may suddenly be pulled toward the stator with great force causing serious hand or finger injury. Always use the special tool to remove or install the rotor assembly.
- Keep the rotor assembly away from magnetically sensitive devices.
- After disconnecting the high voltage terminals, busbars, etc., insulate the parts with insulated tape.
- As a safety warning, attach a sign saying, WORKING ON HIGH VOLTAGE PARTS. DO NOT TOUCH! to the steering wheel.
Turning Off and On Power to the High Voltage Circuit
The following procedure should be done before you work on or near any high voltage components. Follow the procedure exactly. Otherwise, you may be injured or may damage equipment.
1. Turn the ignition switch to LOCK (0), then remove the key from the ignition switch.
2. Remove the cargo floor lid, the cargo floor box, and the spare tire.
3. Loosen the bolt (A), and remove the bolt (B).
4. Remove the battery module switch lid (C) from the IPU cover.
5. Turn the battery module switch (A) OFF, then check that the bolt (B) is showing.
6. Wait at least 5 minutes to allow the PDU capacitors to discharge.
7. Remove the IPU cover.
8. Measure the voltage at the battery module terminals (A). There should be less than 30 V. If the voltage is more than 30 V, there is a problem in the system; check for IMA DTCs before continuing.
9. After service or repairs are completed:
- Make sure all high voltage circuits are connected properly.
- Install the IPU cover.
10. Push the button (A), and turn the battery module switch ON.
11. Reinstall all remaining removed parts.