DESCRIPTION The hybrid
vehicle control ECU compares the IG2 signal to the IG control status
signal sent from the certification ECU (smart key ECU assembly) to
detect a stuck on malfunction of the IG2 signal. HINT: If DTC P253012 is stored, the power switch will turn off (READY off). |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
MIL | Warning Indicate | |
P253012 | IG2 Signal Circuit Short to Auxiliary Battery |
The
IG2 signal of the hybrid vehicle control ECU and the IG control status
signal sent from the certification ECU (smart key ECU assembly) do not
match. (1 trip detection logic) |
- Auxiliary battery
- Certification ECU (smart key ECU assembly)
- Hybrid vehicle control ECU
- ECM
- IG2 NO. 1 relay
- Wire harness or connector
| 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. 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 wait for 15 seconds or more.
- 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.
Click here PROCEDURE
| 1. |
CHECK AUXILIARY BATTERY VOLTAGE | (a)
Turn the power switch off and turn on the high beam headlights for 30
seconds. This will remove the surface charge from the auxiliary battery. (b) Measure the auxiliary battery voltage according to the value(s) in the table below.
Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
Positive (+) auxiliary battery terminal - Negative (-) auxiliary battery terminal |
20°C (68°F), Power switch off |
12.0 V or higher |
| OK |
 | GO TO STEP 3 |
|
NG |
 | |
| 2. |
CHARGE OR REPLACE AUXILIARY BATTERY | (a) Charge or replace the auxiliary battery.
|
NEXT | |
| |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
(e) Clear the DTCs. Powertrain > Hybrid Control > Clear DTCs (f) Turn the power switch off.
|
NEXT | |
| |
| 4. |
CHECK DTC OUTPUT (HYBRID CONTROL) | (a) Turn the power switch on (IG) and wait for 15 seconds or more.
(b) Turn the power switch off and wait for 2 minutes or more. (c) Connect the Techstream to the DLC3.
(d) Turn the power switch on (IG). (e) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. Powertrain > Hybrid Control > Trouble Codes
(f) Check for DTCs. | Result |
Proceed to | | P253012 is output. |
A | | P253012 is not output. |
B | (g) Turn the power switch off.
| B |
| CHECK FOR INTERMITTENT PROBLEMS |
|
A | |
| |
| 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. Powertrain > Hybrid Control > Trouble Codes
| Result |
Proceed to | | U012987, U014087, U015187, U016487, U110787 or U117087 is output |
A | | Other than above |
B | (e) Turn the power switch off.
| B |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
|
A | |
| |
| 6. |
CHECK HYBRID VEHICLE CONTROL ECU |
| (a) Disconnect the A23 and G46 hybrid vehicle control ECU connectors. |
 |
|
*a | Rear view of wire harness connector
(to Hybrid Vehicle Control ECU) | | |
(b) Measure the voltage according to the value(s) in the table below. Condition: |
Tester Connection | Condition | |
A23-3 (IG2) - G46-5 (E01) |
Power switch off | (c) Reconnect the A23 and G46 hybrid vehicle control ECU connectors.
| Result |
Proceed to | | 9 V or higher |
A | | Below 9 V |
B |
| B |
| REPLACE HYBRID VEHICLE CONTROL ECU |
|
A | |
| |
| (a) Disconnect the A23 and G46 hybrid vehicle control ECU connectors. |
|
|
|
*a | Rear view of wire harness connector
(to Hybrid Vehicle Control ECU) | | |
(b) Disconnect the A19 ECM connector. (c) Measure the voltage according to the value(s) in the table below.
Condition: |
Tester Connection | Condition | |
A23-3 (IG2) - G46-5 (E01) |
Power switch off | (d) Reconnect the A19 ECM connector.
(e) Reconnect the A23 and G46 hybrid vehicle control ECU connectors.
| Result |
Proceed to | | 9 V or higher |
A | | Below 9 V |
B |
| B |
| REPLACE ECM |
|
A | |
| |
| 8. |
INSPECT RELAY (IG2 NO. 1) |
| (a) Remove the IG2 NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly. |
 |
|
*1 | No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly | |
*2 | IG2 NO. 1 Relay | | |
| (b) 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 | | |
(c) Reinstall the IG2 NO. 1 relay.
| NG |
| REPLACE RELAY (IG2 NO. 1) |
|
OK | |
| |
| 9. |
CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - IG2 NO. 1 RELAY) |
(a) Disconnect the A23 hybrid vehicle control ECU connector. (b) Remove the IG2 NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
| (c) Measure the voltage according to the value(s) in the table below.
Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
A23-3 (IG2) - Body ground |
Power switch off |
1 V or less | |
 |
|
*a | Rear view of wire harness connector
(to Hybrid Vehicle Control ECU) | | |
(d) Reinstall the IG2 NO. 1 relay. (e) Reconnect the A23 hybrid vehicle control ECU connector.
| OK |
| CHECK FOR INTERMITTENT PROBLEMS |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR | | 
