Hybrid Drive Systems: Service and Repair

L110F HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: PRECAUTION

1. PRECAUTIONS FOR INSPECTING THE HYBRID CONTROL SYSTEM

(a) Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

NOTICE:
After removing the service plug grip, turning the power switch on (READY) may cause a malfunction. Do not turn the power switch on (READY) unless instructed by the repair manual.

(b) After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals.





HINT
Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

(c) Check the voltage at the terminals in the inspection point in the inverter with converter assembly.

CAUTION:
Be sure to wear insulated gloves.

(1) Remove the 2 bolts and connector cover. (For the removal and installation procedures related to the connector cover, Installation.)





NOTICE:
Cover the opening with non-residue tape to prevent entry of foreign matter or liquid after removing the connector cover.

(2) Measure the voltage.





Standard voltage:

0 V

HINT
Set the tester to DC 750 V or more to measure the voltage.

(d) When turning the power switch on (IG) during inspections, do not press the power switch with the brake pedal depressed.

CAUTION:
Pressing the power switch with the brake pedal depressed causes the system to enter the READY-on state. This is very dangerous because high voltage may be applied to the inspection area.

(e) Turn the power switch off, wear insulated gloves, and disconnect the negative terminal of the auxiliary battery before touching any of the orange-colored wires of the high-voltage system.

(f) Turn the power switch off before performing any resistance checks.

(g) Turn the power switch off before disconnecting or reconnecting any connectors.

(h) When high-voltage connectors are removed, wrap the connectors with insulation tape to prevent them from contacting foreign objects.

2. NOTICE FOR HYBRID CONTROL SYSTEM ACTIVATION

(a) When the warning light is illuminated, or the auxiliary battery has been disconnected and reconnected, attempting to turn the power switch on (READY) may not start the system (the system may not enter the READY-on state) on the first attempt. If so, turn the power switch off and reattempt to start the hybrid system.

3. PRECAUTIONS FOR DISCONNECTING AMD TERMINAL

HINT
The AMD terminal is connected to the positive terminal of the auxiliary battery.

(a) Be sure to disconnect the negative terminal of the auxiliary battery before disconnecting the AMD terminal of the hybrid vehicle converter.

(b) After disconnecting the AMD terminal, wrap the terminal with insulation tape.

(c) Be sure to reconnect the AMD terminal of the hybrid vehicle converter before reconnecting the negative terminal of the auxiliary battery.

NOTICE:
A short circuit to ground may occur if the AMD terminal is disconnected before the negative terminal of the auxiliary battery is disconnected. If a short circuit to ground occurs, it can result in an open circuit in a fusible link or fuse.