DESCRIPTION
The battery supplies power 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 battery voltage falls below a minimum level, the ECM data 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 the DTC.
DTC Code |
DTC Detection Condition |
Trouble Area |
SAE |
---|---|---|---|
P056014 |
Open or short in ECM back-up power source circuit for 3 seconds or more (1 trip detection logic). |
|
P0562 |
HINT:
If DTC P056014 is stored, the ECM does 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 |
Immediately (MIL illuminated after next engine start) |
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
The monitor will run whenever the following DTCs are not stored |
None |
Battery voltage |
8 V or higher |
Ignition switch |
ON |
Starter |
OFF |
TYPICAL MALFUNCTION THRESHOLDS
Continuous battery voltage |
Below 3.5 V |
CONFIRMATION DRIVING PATTERN
HINT:
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
Refer to SFI system DTC P056014 (See page ).
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
INSPECT BATTERY |
(a) Inspect that the battery is not depleted (See page
).
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 ECM connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
E14-2 (BATT) - Body ground |
Always |
11 to 14 V |
*a |
Rear view of wire harness connector (to ECM) |
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 Ignition switch ON.
(c) Turn the Techstream on.
(d) Clear the DTCs (See page ).
(e) Turn the Ignition switch off and wait for at least 30 seconds.
(f) Turn the Ignition switch ON.
(g) Turn the Techstream on.
(h) Wait 5 seconds or more.
(i) Enter the following menus: Powertrain / Transmission / Trouble Codes.
(j) Read the DTCs using the Techstream.
Result:
Result |
Proceed to |
---|---|
DTC P056014 is output |
A |
DTC is not output |
B |
A | ![]() |
REPLACE ECM |
B | ![]() |
CHECK FOR INTERMITTENT PROBLEMS |
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Reporting Safety Defects
Reporting Safety Defects to
the United States
Government
If you believe that your vehicle
has a defect which could cause
a crash or could cause injury or
death, you should immediately
inform the National Highway
Traffic Safety Administration
(NHTSA) in addition to notifying
General Motors.
If NHTSA ...