System Description

WARNING: This page is about a different variant/trim than selected.

HINT:

If a decrease in insulation resistance cannot be confirmed using a megohmmeter, check "Short Wave Highest Value Level" in the Data List.

SHORT WAVE HIGHEST VALUE LEVEL
1. "Short Wave Highest Value Level" shows a decrease in insulation resistance. When insulation resistance decreases, "Insulation Lower" will be displayed. However, even though the insulation resistance of the vehicle is normal, "Short Wave Highest Value Level" may decrease, so that "Not Judge" will be displayed for any of the following conditions.
  - Within approximately 1 minute since the ignition switch was turned to ON.
  - When the system voltages ("Hybrid Battery Voltage", "VL-Voltage before Boosting" and "VH-Voltage after Boosting") are changing.
  - During boosting. If the Data List item "Boost Ratio" is not 0% or within a few seconds of it becoming 0%. (The values of "Hybrid Battery Voltage", "VL-Voltage before Boosting" and "VH-Voltage after Boosting" are about the same when not boosting.)
  - When "No" is displayed for any of the following Data List items:
    - Short Wave Highest Value Availability just after MG Inv On/Off
    
    - Short Wave Highest Value Availability just after A/C Inv On/Off
    
    - Short Wave Highest Value Availability just after SMR On/Off
2. When "Short Wave Highest Value Level" shows "Insulation Lower LV3", insulation resistance will be close to 0 Ω. In this case, damage to a high-voltage cable or hybrid component (high-voltage), or a short to body ground due to intrusion of foreign matter, such as metal particles, can be suspected.

RELATED FREEZE FRAME DATA

If problem symptoms cannot be reproduced and a malfunction still exists after replacing a part as instructed, checking the following freeze frame data can help determine a trouble area.

ITEMS TO BE CHECKED USING FREEZE FRAME DATA:

Freeze Frame Data	Diagnostic Note
Short Wave Highest Value Level	Indicates that the insulation resistance has decreased.
VL-Voltage before Boosting VH-Voltage after Boosting Hybrid Battery Voltage Boost Ratio	During boosting (when "Boost Ratio" is not 0%), or when "VL-Voltage before Boosting", "VH-Voltage after Boosting" or "Hybrid Battery Voltage" is varying, "Short Wave Highest Value Level" may decrease even though the insulation resistance is normal.
SMRP Status SMRB Status SMRG Status	When "SMRP Status", "SMRB Status" and "SMRG Status" are all OFF, the insulation malfunction detection circuit detects a decrease in insulation resistance in the HV battery area ((*d) in the wiring diagram). Example: When the ignition switch is turned to ON (not ON (READY)), all 3 system main relays are off and it is suspected that the HV battery assembly is disconnected from the high voltage circuits. If "Short Wave Highest Value Level" decreases a few minutes after the ignition switch is turned to ON (not ON (READY)), the HV battery assembly may have an insulation malfunction.
Motor Inverter Shutdown Status	When "Motor Inverter Shutdown Status" is ON, the insulation malfunction detection circuit cannot detect a decrease in insulation resistance in the motor system AC (alternating current) section (motor (MG2) side of (*e) in the wiring diagram). The motor system AC (alternating current) section includes the motor (MG2) in the hybrid vehicle transaxle assembly, motor cables and the AC (alternating current) section of the motor drive circuit in the inverter with converter assembly.
Generator Inverter Shutdown Status	When "Generator Inverter Shutdown Status" is ON, the insulation malfunction detection circuit cannot detect a decrease in insulation resistance in the generator system AC (alternating current) section (generator (MG1) side of (*e) in the wiring diagram). The generator system AC (alternating current) section includes the generator (MG1) in the hybrid vehicle transaxle assembly, generator cables and the AC (alternating current) section of the generator drive circuit in the inverter with converter assembly.
A/C Consumption Power	The compressor with motor assembly AC (alternating current) section ((*c) in the wiring diagram) includes the air conditioning motor, wiring between the air conditioning motor and air conditioning inverter, and the AC (alternating current) section of the air conditioning motor drive circuit in the air conditioning inverter. With the vehicle stopped, turn on/off the air conditioning system and observe "Short Wave Highest Value Level" to use as a diagnosis reference.

HINT:

Reproducing the vehicle conditions the moment a DTC was stored according to the freeze frame data and results of the customer problem analysis helps ensure that the same DTC is stored again.

DRIVING STATUS

Item	Diagnostic Note
Vehicle Speed	-
Accelerator Position Sensor No. 1 Voltage %	-
Engine Speed	-
Shift Position	-
Master Cylinder Control Torque	-
Coolant Temperature	-

OPERATION CONDITIONS

Item	Diagnostic Note
Motor Temperature	If any liquid leaks into the ATF, insulation resistance may decrease only when the temperature is high. The motor temperature is likely to increase if the motor speed is low and output torque is high such as when cruising uphill slowly or accelerating from a low speed.
Generator Temperature	If any liquid leaks into the ATF, insulation resistance may decrease only when the temperature is high. The generator temperature is likely to increase under repeat acceleration and deceleration while the vehicle is driven in the mid speed range (60 to 80 km/h (37 to 50 mph)).

Customer Problem Analysis

Ask the customer about the operating conditions and environment when the malfunction occurred.

Item	Diagnostic Note
Driving Condition (acceleration, deceleration, turning, etc.)	Changes in the insulation of the parts with insufficient insulation due to changes in G force or vibration are suspected.
Road Condition (unpaved, etc.)
Weather (rain, snow, etc.)	Water intrusion is suspected
Washing the vehicle (Whether the malfunction occurred after washing the vehicle?)	Water intrusion is suspected