Lexus ES: Motor Generator ECU(EEPROM) Calibration / Parameter Memory Failure (P1C2E46)
DESCRIPTION
The motor generator control ECU monitors its internal operation and will store this DTC if it detects a malfunction in its EEPROM.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate |
|---|---|---|---|---|---|
| P1C2E46 | Motor Generator ECU(EEPROM) Calibration / Parameter Memory Failure | ECU internal malfunction (EEPROM error) (2 trip detection logic) | Inverter with converter assembly | Does not come on | Master Warning Light: Comes on |
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.
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- 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 the power switch on (IG) and wait for 5 seconds or more.
- Turn the power switch off and wait for 2 minutes or more.
- Turn the power switch on (IG) and wait for 5 seconds or more.
- Enter the following menus: Powertrain / Motor Generator / Utility / All Readiness.
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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 driving pattern again.
PROCEDURE
| 1. | CHECK AUXILIARY BATTERY VOLTAGE |
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HINT:
If the auxiliary battery voltage inspection results are normal, perform the next step.
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| 2. | CLEAR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Enter the following menus: Powertrain / Motor Generator / Trouble Codes.
(d) Clear the DTCs.
Powertrain > Motor Generator > Clear DTCs(e) Turn the power switch off and wait for 2 minutes or more.
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| 3. | PERFORM SIMULATION TEST |
(a) Turn the power switch on (IG) and wait for 5 seconds or more.
(b) Turn the power switch off and wait for 2 minutes or more.
(c) Turn the power switch on (IG) and wait for 5 seconds or more.
(d) Enter the following menus: Powertrain / Motor Generator / Trouble Codes.
(e) Check for DTCs.
Powertrain > Motor Generator > Trouble Codes| Result | Proceed to |
|---|---|
| P1C2E46 is output. | A |
| P1C2E46 is not output. | B |
(f) Turn the power switch off.
| A | .gif) | REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS |
| B | | CHECK FOR INTERMITTENT PROBLEMS |
