MONITOR DESCRIPTION The
battery supplies electricity to the ECM even when the engine switch is
off. This power allows the ECM to store data such as DTC history, freeze
frame data and fuel trim values. If the 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). |
- Open or short in back up power source circuit
- Battery
- Battery terminals
- ECM
| Comes on |
DTC stored | SAE Code: P0562 | MONITOR STRATEGY
Related DTCs | P0562: ECM system voltage range check (low voltage) |
Required Sensors/Components (Main) | ECM |
Required Sensors/Components (Related) |
- | Frequency of Operation |
Continuous | Duration |
3 seconds | MIL Operation |
Immediate | Sequence of Operation |
None | TYPICAL ENABLING CONDITIONS
Monitor runs whenever the following DTCs are not stored |
None | All of the following conditions are met |
- | Battery voltage | 8 V or higher |
Engine switch | On (IG) | Starter |
Off | TYPICAL MALFUNCTION THRESHOLDS
Both of the following conditions are met |
- | Battery voltage (BATT) |
Less than 3.5 V | Electronic throttle actuator power supply voltage (+BM) |
Less than 3.5 V | 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 engine switch on (IG).
- Turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the engine switch off and wait for at least 30 seconds.
- Turn the engine switch on (IG).
- Turn the Techstream on.
- Wait 5 seconds or more [A].
- Enter the following menus: Powertrain / Engine / Trouble Codes [B].
- Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.
- Input the DTC: P056014.
- Check the DTC judgment result.
Techstream Display |
Description |
NORMAL |
- DTC judgment completed
- System normal
|
ABNORMAL |
- DTC judgment completed
- System abnormal
|
INCOMPLETE |
- DTC judgment not completed
- Perform driving pattern after confirming DTC enabling conditions
|
HINT:
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following procedure.
- After turning engine switch off, waiting time may be required before
disconnecting the cable from the negative (-) battery terminal.
Therefore, make sure to read the disconnecting the cable from the
negative (-) battery terminal notices before proceeding with work.
Click here
HINT: Read
freeze frame data using the Techstream. 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
(a) Inspect the battery.
Click here OK: Battery voltage is between 11 to 14 V.
NG |
| CHARGE OR REPLACE BATTERY |
OK |
| |
2. |
CHECK BATTERY TERMINAL | (a) Check that the battery terminals are not loose or corroded.
OK: Battery terminals are not loose or corroded
NG |
| REPAIR OR REPLACE BATTERY TERMINAL |
OK |
| |
3. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE OF ECM) |
*a | Front view of wire harness connector
(to ECM) | (a) Disconnect the ECM connector.
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
Tester Connection | Condition |
Specified Condition |
A18-1 (BATT) - Body ground |
Always | 11 to 14 V |
A18-8 (+BM) - Body ground |
Always | 11 to 14 V |
NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ECM) |
OK |
| |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG). (c) Turn the Techstream on.
(d) Clear the DTC. Powertrain > Engine > Clear DTCs (e) Turn the engine switch off and wait for at least 30 seconds.
NEXT |
| |
5. |
CHECK WHETHER DTC OUTPUT RECURS (DTC P056014) |
(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(b) Enter the following menus: Powertrain / Engine / Trouble Codes. (c) Read the DTCs. Powertrain > Engine > Trouble Codes
Result | Proceed to |
DTCs are not output | A |
DTC P056014 is output |
B |
A |
| CHECK FOR INTERMITTENT PROBLEMS |
B |
| REPLACE ECM | |