Toyota Corolla Cross: Rear Motor High-voltage Circuit
DESCRIPTION
The cause of the malfunction may be the high-voltage circuit of the rear motor.
Check the rear motor internal resistance and the connection condition of the high-voltage line between the inverter and rear motor to check whether there is an open or short circuit.
Related Parts Check|
Area | Inspection |
|---|---|
|
HV floor under wire (rear traction motor cable) connection check |
Check for open or short circuit in the connection condition of the cable from the inverter to the rear motor. |
|
Rear motor or HV floor under wire (rear traction motor cable) |
Check the rear motor (including cable) internal resistance and the insulation resistance with body ground to check for an open or short circuit. |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
This diagnostic procedure is referenced to in the diagnostic procedure of several DTCs.
If the result of this diagnostic procedure is normal, proceed as directed in the procedure for the DTC.
CAUTION:
Refer to the precautions before inspecting high voltage circuit.
Click here .gif)
NOTICE:
- After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
Click here
- When disconnecting and reconnecting the auxiliary battery
HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
Click here
PROCEDURE
|
1. | CHECK INVERTER WITH CONVERTER ASSEMBLY (HV FLOOR UNDER WIRE (REAR TRACTION MOTOR CABLE) CONNECTION CONDITION) |
CAUTION:
Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
NOTICE:
After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
| (b) Check that the bolts for the HV floor under wire (rear traction motor cable) are tightened to the specified torque, the HV floor under wire (rear traction motor cable) is connected securely, and there are no contact problems. Specified Condition: T = 8.0 N*m (82 kgf*cm, 71 in.*lbf) |
|
(c) Disconnect the HV floor under wire (rear traction motor cable) from the inverter with converter assembly.
(d) Check for arc marks at the terminals for the HV floor under wire (rear traction motor cable).
|
Result | Proceed to | |
|---|---|---|
|
The terminals are connected securely and there are no contact problems. |
There are no arc marks. |
A |
| The terminals are not connected securely and there is a contact problem. |
There are arc marks. |
B |
| The terminals are not connected securely and there is a contact problem. |
There are no arc marks. |
C |
| The terminals are connected securely and there are no contact problems. |
There are arc marks. |
B |
(e) Reconnect the HV floor under wire (rear traction motor cable).
| B | .gif) | REPLACE MALFUNCTIONING PARTS |
| C | | CONNECT SECURELY |
|
.gif)
|
2. | CHECK REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY (REAR MOTOR (MGR)) |
CAUTION:
Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
NOTICE:
After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
| (b) Disconnect the HV floor under wire (rear traction motor cable) from the inverter with converter assembly. |
|
| (c) Using a milliohmmeter, measure the resistance according to the value(s) in the table below. HINT: If the rear motor (MGR) temperature is high, the resistance will vary greatly from the specification. Therefore, measure the resistance at least 8 hours after the vehicle is stopped. Standard Resistance:
HINT: To correct the variation of the measured resistance due to temperature, use the following formula to calculate the resistance at 20°C (68°F). R20 = Rt / {1 + 0.00393 X (T - 20)} The calculation is based on the following: R20: Resistance at 20°C (68°F) (mΩ) Rt: Measured resistance (mΩ) T: Temperature when the resistance is measured (°C (°F).) |
|
(d) Using a megohmmeter set to 500 V, measure the resistance according to the value(s) in the table below.
NOTICE:
Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
W3-2 (R-V) - Body ground |
Ignition switch off |
100 MΩ or higher |
|
W3-1 (R-U) - Body ground |
Ignition switch off |
100 MΩ or higher |
|
W3-3 (R-W) - Body ground |
Ignition switch off |
100 MΩ or higher |
(e) Reconnect the HV floor under wire (rear traction motor cable).
| OK | | REAR MOTOR HIGH-VOLTAGE CIRCUIT NORMAL (PERFORM NEXT STEP FOR REFERENCED DTC) |
|
|
3. | CHECK REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY (HV FLOOR UNDER WIRE (REAR TRACTION MOTOR CABLE) CONNECTION CONDITION) |
CAUTION:
Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
NOTICE:
After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
| (b) Check that the bolts for the HV floor under wire (rear traction motor cable) are tightened to the specified torque, the HV floor under wire (rear traction motor cable) is connected securely, and there are no contact problems. Specified Condition: T=8.0 N*m (82 kgf*cm, 71 in.*lbf) |
|
(c) Disconnect the HV floor under wire (rear traction motor cable) from the rear traction motor with transaxle assembly.
(d) Check for arc marks at the terminals for the HV floor under wire (rear traction motor cable).
|
Result | Proceed to | |
|---|---|---|
|
The terminals are connected securely and there are no contact problems. |
There are no arc marks. |
A |
| The terminals are not connected securely and there is a contact problem. |
There are arc marks. |
B |
| The terminals are not connected securely and there is a contact problem. |
There are no arc marks. |
C |
| The terminals are connected securely and there are no contact problems. |
There are arc marks. |
B |
(e) Reconnect the HV floor under wire (rear traction motor cable).
| B | | REPLACE MALFUNCTIONING PARTS |
| C | | CONNECT SECURELY |
|
|
4. | CHECK FLOOR UNDER WIRE (REAR TRACTION MOTOR CABLE) |
CAUTION:
Be sure to wear insulated gloves.
(a) Check that the service plug grip is not installed.
NOTICE:
After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.
| (b) Disconnect the HV floor under wire (rear traction motor cable) from the inverter with converter assembly. |
|
| (c) Disconnect the HV floor under wire (rear traction motor cable) from the rear traction motor with transaxle assembly. |
|
| (d) Using a megohmmeter set to 500 V, measure the resistance according to the value(s) in the table below. NOTICE: Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected. Standard Resistance:
NOTICE: Wrap the terminals of the motor cable with insulating tape to prevent them from coming into contact with body ground. |
|
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
W3-3 (R-W) - c1-3 (W) |
Ignition switch off |
Below 1 Ω |
|
W3-2 (R-V) - c1-2 (V) |
Ignition switch off |
Below 1 Ω |
|
W3-1 (R-U) - c1-1 (U) |
Ignition switch off |
Below 1 Ω |
|
W3-3 (R-W) - c1-1 (U) |
Ignition switch off |
100 MΩ or higher |
|
W3-2 (R-V) - c1-3 (W) |
Ignition switch off |
100 MΩ or higher |
|
W3-1 (R-U) - c1-2 (V) |
Ignition switch off |
100 MΩ or higher |
(f) Reconnect the HV floor under wire (rear traction motor cable) to the rear traction motor with transaxle assembly.
(g) Reconnect the HV floor under wire (rear traction motor cable) to the inverter with converter assembly.
| OK | | REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY |
| NG | | REPLACE FLOOR UNDER WIRE |
READ NEXT:
Shut Down Signal Circuit
DESCRIPTION The cause of the malfunction may be a shutdown signal.
Check whether there is a shutdown signal +B short circuit. Related Parts Check
Area Inspection
HSDN terminal C
Inverter Low-voltage Circuit
DESCRIPTION The cause of the malfunction may be the low-voltage circuit.
Check whether there is an open circuit in the inverter +B low-voltage power source system or a problem in the communication
HV Battery High-voltage Line Circuit
DESCRIPTION The cause of the malfunction may be the HV battery high-voltage line circuit.
Check the continuity in the high-voltage line from the HV battery to the inverter.
Check the connection
SEE MORE:
Parts Location
PARTS LOCATION ILLUSTRATION
*1 ECM
*2 NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY
- INJ FUSE *3
IGNITION COIL ASSEMBLY
*4 SPARK PLUG
High Voltage Power Resource Circuit Voltage Sensor after Boosting Malfunction (P1C8349)
DTC SUMMARY MALFUNCTION DESCRIPTION The hybrid vehicle control ECU monitors the high-voltage wiring between the HV battery and inverter with converter assembly and detects a power supply malfunction.
The cause of this malfunction may be one of the following: Inverter voltage sensor (VL) internal
