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 and freeze frame data. If the battery voltage falls below a minimum level, the stored ECM data will be cleared and the ECM will determine 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 | ECM back-up power source circuit voltage is low for 3 seconds or more (1-trip detection logic). |
| Comes on | DTC stored | SAE Code: P0562 |
HINT:
If DTC P056014 is stored, the ECM will not store other DTCs.
MONITOR STRATEGY
Related DTCs | P0562: ECM system voltage/Range check (Low voltage) |
Required sensors/components (Main) | ECM |
Required sensors/components (Sub) | - |
Frequency of operation | Continuous |
Duration | 3 sec. |
MIL operation | Immediate |
Sequence of operation | None |
TYPICAL ENABLING CONDITIONS
The monitor will run whenever the following DTCs are not stored | None |
Battery voltage | 8 V or more |
Engine switch | On (IG) |
Starter | OFF |
TYPICAL MALFUNCTION THRESHOLDS
Continuous battery voltage | Less than 3.5 V |
CONFIRMATION DRIVING PATTERN
HINT:
Click here
HINT:
[*1] : Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Techstream Display | Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
N/A |
|
HINT:
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
Click here
PROCEDURE
1. | INSPECT BATTERY |
(a) Check that the battery is not depleted.
Click here
OK:
Battery is not depleted.
NG | CHARGE OR REPLACE BATTERY |
|
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 |
|
3. | CHECK TERMINAL VOLTAGE (POWER SOURCE OF ECM) |
(a) Disconnect the A28 ECM connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition | Specified Condition |
---|---|---|
A28-1 (BATT) - Body ground | Always | 11 to 14 V |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ECM) |
|
4. | CHECK WHETHER DTC OUTPUT RECURS (DTC P056014) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Clear the DTCs.
Powertrain > Transmission > Clear DTCs(e) Turn the engine switch off and wait for at least 30 seconds.
(f) Turn the engine switch on (IG).
(g) Turn the Techstream on.
(h) Wait 5 seconds or more.
(i) Enter the following menus: Powertrain / Transmission / Trouble Codes.
Powertrain > Transmission > Trouble Codes(j) Read the DTCs.
Result | Proceed to |
---|---|
DTC P056014 is output | A |
DTCs are not output | B |
B | CHECK FOR INTERMITTENT PROBLEMS |
|
5. | REPLACE ECM |
(a) Replace the ECM.
Click here
NEXT | PERFORM REGISTRATION |