If one of the following conditions is met when the HW IGBT gate is set to ON, the MCU
will set the diagnosis code No. P1A2B.
The difference between the U-phase indicated current
and detected current is 50 A or more.
The difference between the W-phase indicated current and detected current is 50
A or more.
PROBABLE CAUSES
Motor (electric motor unit) abnormality (coil abnormality,
resolver failure, electric leakage)
Malfunction of the MCU
DIAGNOSIS PROCEDURE
STEP 1. Connector check: E-07 MCU, motor (electric motor
unit) connector
Q.
Is the check result normal?
Go to Step 2.
Repair the damaged connector.
STEP 2. Measure the resistance at E-07 MCU, motor (electric motor
unit) connector.
(1)Disconnect the E-07 MCU, motor (electric motor unit) connector.
(2)Measure the resolver resistance between the E-07 motor (electric motor unit) connector
terminals.
RESISTANCE VALUE AT ROOM TEMPERATURE OF 25°C
Terminal No.
Normal value
6 - 13
31 to 41 Ω
5 - 12
79 to 97 Ω
4 - 11
72 to 88 Ω
6 - 4, 5, 11, 12
No continuity
13 - 4, 5, 11, 12
No continuity
Q.
Is the check result normal?
Go to Step 3.
Go to Step 4.
STEP 3. Measure the insulation resistance of the G-07, G-08, G-09
MCU high-voltage cable.
danger
Carry out the check on the high-voltage circuit while reading
carefully the precautions on handling a high-voltage vehicle. (Refer to .)
danger
Wear the specified protection equipment during the check.
caution
Before measuring the insulation resistance, set the range
of the electric insulation tester (special tool: MB992355) to 500 V. If a range exceeding 500 V
is used for the measurement, the part may be damaged.
(1)Shut down the high voltage.
(2)Disconnect the drive motor cable (refer to )
and measure it on the MCU side.
(3)Use the electric insulation tester (special tool: MB992355) and set it to the 500
V range.
(4)Measure the insulation resistance between one of the G-07, G-08, G-09 MCU high-voltage
terminals and the body. OK: 10 MΩ or more
Q.
Is the check result normal?
Go to Step 5.
Go to Step 4.
STEP 4. Diagnosis code recheck
Check again if the diagnosis code is set to the MCU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the "LOCK" (OFF) position to the "ON" position.
(3)Set the electric motor switch to the "START" position, and start the electric motor
unit.
(4)Run the vehicle.
(5)Check if the diagnosis code is set.
Q.
Is the diagnosis code set?
Replace the motor (electric motor unit). (Refer to .)
Then go to Step 5.
The diagnosis is complete.
STEP 5. Diagnosis code recheck
Check again if the diagnosis code is set to the MCU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the "LOCK" (OFF) position to the "ON" position.
(3)Set the electric motor switch to the "START" position, and start the electric motor
unit.
(4)Run the vehicle.
(5)Check if the diagnosis code is set.
Q.
Is the diagnosis code set?
Replace the MCU. (Refer to .) Then go to
Step 6.
The diagnosis is complete.
STEP 6. Diagnosis code recheck
Check again if the diagnosis code is set to the MCU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the "LOCK" (OFF) position to the "ON" position.
(3)Set the electric motor switch to the "START" position, and start the electric motor
unit.
)
)
)
Go to Step 2.
Repair the damaged connector.
)
and measure it on the MCU side. 