Lexus ES: IGB Signal Circuit Short to Auxiliary Battery (P1CFA12)
DESCRIPTION
The hybrid vehicle control ECU monitors the IGB signal received from the certification ECU (smart key ECU assembly). When an error is detected in the IGB signal, this DTC is stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate |
|---|---|---|---|---|---|
| P1CFA12 | IGB Signal Circuit Short to Auxiliary Battery | An IGB signal from the hybrid vehicle control ECU is on when the power switch is off. (1 trip detection logic) |
| Does not come on | Master Warning Light: Comes on |
CONFIRMATION DRIVING PATTERN
HINT:
After repair has been completed, clear the DTCs 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.
- 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 driving pattern again.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Before replacing the certification ECU (smart key ECU assembly), refer to Registration.
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PROCEDURE
| 1. | CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) |
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| NG | .gif) | CONNECT SECURELY |
|
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| 2. | CHECK CONNECTOR CONNECTION CONDITION (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)) |
(a) Check the connector connection condition of the certification ECU (smart key ECU assembly).
Click here
OK:
The connector is connected securely and there are no contact problems.
| NG | | CONNECT SECURELY |
|
| 3. | CHECK HARNESS AND CONNECTOR (IGB TERMINAL VOLTAGE) |
(a) Turn the power switch off.
| (b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
| OK | | REPLACE HYBRID VEHICLE CONTROL ECU |
|
| 4. | CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)) |
(a) Disconnect the G47 certification ECU (smart key ECU assembly) connector.
| (b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
(c) Reconnect the G47 certification ECU (smart key ECU assembly) connector.
| OK | | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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