Technician Safety Information: Service Precautions
Service PrecautionsIMA System
- The IMA (Integrated Motor Assisted) system uses high voltage (158 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 has been discharged, or its cable has been disconnected, or the MCM (Motor Control Module) has been reset, the IMA battery level gauge (BAT) will not display the state of charge when the engine is started. Start the engine, and hold it between 3,500 rpm and 4,000 rpm without load (in Park or neutral) until the IMA charge indicator displays at least three segments.
- Observe the following instructions when inspecting or servicing the IMA system.
- When the IMA system indicator is on, perform the IMA system troubleshooting firs.
- 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.
- Wait for 5 or more 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, make sure that the voltage between the terminals is below 30 V when measured with a voltmeter.
- When servicing the parts without the insulating sheath, be sure to use the 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 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 Power to the High Voltage Circuit
The following procedure should be performed prior to working 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 OFF.
2. Remove the rear seat back.
3. Remove the battery module switch lid (A) from the battery module.
4. Turn the battery module switch (A) OFF, then check that the bolt (B) is showing.
5. Wait at least 5 minutes to allow the PDU capacitors to discharge.
6. Remove the IPU lid.
7. Measure voltage at the junction board terminals (A). There should be 30 V or less. If more than 30 V is present, there is a problem in the circuit; do the DTC troubleshooting first.
8. Before the battery module switch is turned ON, make sure all the high voltage circuits are connected properly. The push the tab (A), and turn the battery switch ON.
Engine Compartment Inspection/Servicing
The Civic Hybrid has an Auto-Stop system that shuts the engine off under certain conditions to improve fuel economy while the vehicle is at a stop.In Auto-Stop mode, driver input, such as releasing the brake pedal, will cause the engine to restart.
Before servicing the Civic Hybrid, turn the ignition switch OFF, and remove the key so the engine cannot be started.
Before performing any service on the Civic Hybrid IMA system, make sure to turn the battery module switch OFF and wait five minutes before working on the vehicle.