MONITOR DESCRIPTION
The auxiliary battery supplies electricity to the ECM even when the ignition switch is off. This power allows the ECM to store data such as DTC history, Freeze Frame Data and fuel trim values. If the auxiliary battery voltage falls below a minimum level, the memory is cleared and the ECM determines that there is a malfunction in the power supply circuit. The next time the engine is started, the ECM will illuminate the MIL and store this DTC.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
---|---|---|---|---|---|---|
P056014 | System Voltage Circuit Short to Ground or Open | An open or short in the ECM backup power source circuit (1 trip detection logic). |
| Comes on | DTC stored | SAE: P0562 |
MONITOR STRATEGY
Required Sensors/Components | ECM |
Frequency of Operation | Continuous |
TYPICAL MALFUNCTION THRESHOLDS
Continuous auxiliary battery voltage | Less than 3.5 V |
CONFIRMATION DRIVING PATTERN
HINT:
GTS Display | Description |
---|---|
NORMAL |
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ABNORMAL |
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INCOMPLETE |
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HINT:
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
HINT:
Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
PROCEDURE
1. | INSPECT AUXILIARY BATTERY |
(a) Inspect that the auxiliary battery is not depleted.
Click here
OK:
Auxiliary battery is not depleted
NG |
![]() | CHARGE OR REPLACE AUXILIARY BATTERY |
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2. | CHECK AUXILIARY BATTERY |
(a) Check that the auxiliary battery terminals are not loose or corroded.
OK:
Auxiliary battery terminals are not loose or corroded.
NG |
![]() | REPAIR OR REPLACE AUXILIARY BATTERY TERMINAL |
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3. | CHECK TERMINAL VOLTAGE (POWER SOURCE OF ECM) |
(a) Disconnect the ECM connector.
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
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NG |
![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - ECM) |
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4. | CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine > Clear DTCs(b) Turn the ignition switch off and wait for at least 30 seconds.
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5. | CHECK WHETHER DTC OUTPUT RECURS (DTC P056014) |
(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(b) Read the DTCs.
Powertrain > Engine > Trouble Codes Result | Proceed to |
---|---|
DTCs are not output | A |
P056014 is output | B |
A |
![]() | CHECK FOR INTERMITTENT PROBLEMS |
B |
![]() | REPLACE ECM |
WARNING
Never allow a person to ride in the luggage compartment/trunk
Allowing a person to ride in the luggage compartment/trunk is dangerous. The person in the luggage compartment/trunk could be seriously injured or killed during sudden braking or a collision.
Do not drive with the liftgate/trunk lid open