DTC SUMMARY MALFUNCTION DESCRIPTION The hybrid vehicle control ECU monitors the motor generator control ECU (MG ECU).
The cause of this malfunction may be the following: Motor generator control ECU internal malfunction
- Motor generator control ECU (MG ECU) malfunction
DESCRIPTION The
hybrid vehicle control ECU monitors the motor generator control ECU (MG
ECU) and stores this DTC when it detects a malfunction. |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
MIL | Warning Indicate | |
P0A1B94 | Drive Motor "A" Control Module Unexpected Operation |
The
motor generator control ECU (MG ECU) value received by the hybrid
vehicle control ECU exceeds the threshold for a certain period of time. (1 trip detection logic) |
- Inverter with converter assembly
- Fusible link block assembly (IGCT fuse)
- IGCT relay
| Comes on |
Master Warning Light: Comes on | MONITOR DESCRIPTION
The
hybrid vehicle control ECU monitors the motor generator control ECU (MG
ECU). If the internal operation is malfunctioning, the hybrid vehicle
control ECU illuminates the MIL and stores a DTC. MONITOR STRATEGY |
Related DTCs | P0A1B (INF P0A1B94): Drive motor "A" control module | |
Required sensors/components | Inverter with converter assembly (MG ECU) | |
Frequency of operation | Continuous | |
Duration | TMC's intellectual property | |
MIL operation | 1 driving cycle | |
Sequence of operation | None | TYPICAL ENABLING CONDITIONS |
The monitor will run whenever the following DTCs are not stored |
TMC's intellectual property | | Other conditions belong to TMC's intellectual property |
- | TYPICAL MALFUNCTION THRESHOLDS |
TMC's intellectual property | - | COMPONENT OPERATING RANGE |
Hybrid vehicle control ECU | DTC P0A1B (INF P0A1B94) is not detected | CONFIRMATION DRIVING PATTERN
HINT:
- After repair has been completed, clear the DTC and then check that the
vehicle has returned to normal by performing the following All Readiness
check procedure.
Click here 
- When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off and wait for 2 minutes or more.
- Turn the power switch on (IG) and turn the Techstream on.
- With power switch on (IG) and wait for 2 minutes or more. [*1]
HINT:
- Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
- Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.
WIRING DIAGRAM
 CAUTION / NOTICE / HINT
NOTICE: After
turning the power switch off, waiting time may be required before
disconnecting the cable from the negative (-) auxiliary battery
terminal. Therefore, make sure to read the disconnecting the cable from
the negative (-) auxiliary battery terminal notices before proceeding
with work. Click here PROCEDURE
| 1. |
CHECK AUXILIARY BATTERY TERMINAL (CONTACT PROBLEM) |
(a) Check the connection of the negative (-) and positive (+) auxiliary battery terminals.
OK: The terminals are connected securely and there is no contact problem.
HINT: If
performing a reproduction test, turn the power switch on (IG) and shake
the wire harnesses vertically and horizontally before checking for
DTCs. | NG |
 | GO TO STEP 6 |
|
OK |
 | |
| 2. |
CHECK GROUND WIRE CONNECTION CONDITION |
| (a) Check the installation condition of the ground wires MA. OK:
The ground wires MA are securely installed. HINT: If
performing a reproduction test, turn the power switch on (IG) and shake
the wire harnesses vertically and horizontally before checking for
DTCs. | |
| NG |
| GO TO STEP 7 |
|
OK | |
| |
| 3. |
CHECK FUSIBLE LINK (IGCT) | (a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Disconnect the cable from the positive (+) auxiliary battery terminal.
(c) Check the fusible link block assembly (IGCT) for improper installation.
OK: The fusible link block assembly is installed securely and there is no contact problem.
| (d) Disconnect the 7B fusible link block assembly connector. |
|
| (e) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
7B-1 - A-1 (Positive (+) auxiliary battery terminal) |
Power switch off |
Below 1 Ω | |
 |
|
*1 | Fusible Link Block Assembly | |
*a | Component without harness connected
(Fusible Link Block Assembly) | | |
(f) Reconnect the 7B fusible link block assembly connector. (g) Reconnect the cable from the positive (+) auxiliary battery terminal.
(h) Reconnect the cable from the negative (-) auxiliary battery terminal.
| NG |
| GO TO STEP 8 |
|
OK | |
| |
(a) Check the IGCT relay for improper installation.
OK: The relay is installed securely. HINT: If
performing a reproduction test, turn the power switch on (IG) and
gently vibrate the IGCT relay with a finger before checking for DTCs.
| (b) Remove the IGCT relay from the No. 3 relay block. |
 |
|
*1 | No. 3 Relay Block | |
*2 | IGCT Relay | | |
| (c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
3 - 5 | Auxiliary battery voltage not applied between terminals 1 and 2 |
10 kΩ or higher | |
Auxiliary battery voltage applied between terminals 1 and 2 |
Below 1 Ω | | |
(d) Install the IGCT relay.
| NG | |
GO TO STEP 9 |
|
OK | |
| |
| 5. |
CHECK DTC OUTPUT (HYBRID CONTROL) | (a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG). (c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
(d) Check for DTCs. HINT: Check the DTCs that were output when the vehicle was brought to the workshop. Powertrain > Hybrid Control > Trouble Codes
|
Result | Proceed to | |
P0A1B94 only is output |
A | | DTCs except P0A1B94 are output |
B | (e) Turn the power switch off.
| A |
| REPLACE INVERTER WITH CONVERTER ASSEMBLY |
| B |
| GO TO DTC CHART (HYBRID CONTROL SYSTEM) |
| NEXT |
| GO TO STEP 10 |
| NEXT |
| GO TO STEP 10 |
| 8. |
REPAIR OR REPLACE MALFUNCTIONING PARTS |
| NEXT |
| GO TO STEP 10 |
| 9. |
REPAIR OR REPLACE MALFUNCTIONING PARTS |
|
NEXT | |
| |
Click here
|
NEXT | |
| |
(a) Turn the power switch off and wait for 2 minutes or more.
(b) Turn the power switch on (IG) and wait for 2 minutes or more. (c) Turn the power switch off.
|
NEXT | |
| |
| 12. |
CHECK DTC OUTPUT (HYBRID CONTROL) | (a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG). (c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. Powertrain > Hybrid Control > Trouble Codes
(d) Check for DTCs. |
Result | Proceed to | |
No DTCs are output | A | |
P0A1B94 only is output |
B | | DTCs except P0A1B94 are output |
C | (e) Turn the power switch off.
| A |
| END |
| B |
| REPLACE INVERTER WITH CONVERTER ASSEMBLY |
| C |
| GO TO DTC CHART (HYBRID CONTROL SYSTEM) | | 
