- Open in back up power source circuit
- Battery
- Battery terminals
- EFI NO. 1 fuse
- ECM
| Last Modified: 11-29-2007 | 1.6 C | |
| Service Category: Engine/Hybrid System | Section: Engine Control | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000000T8P07ZX |
| Title: 2UZ-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
DTC |
P0560 |
System Voltage |
DESCRIPTION
The 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 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. When the engine is next started, the ECM illuminates the MIL and stores the DTC.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
P0560 |
Open in ECM back up power source circuit (1 trip detection logic) |
|
HINT:
If DTC P0560 is stored, the ECM does not store other DTCs or the data stored in the ECM is partly cleared.
MONITOR STRATEGY
|
Related DTCs |
P0560: ECM system voltage |
|
Required Sensors/Components (Main) |
ECM |
|
Required Sensors/Components (Related) |
- |
|
Frequency of Operation |
Continuous |
|
Duration |
3 seconds |
|
MIL Operation |
Immediate (MIL illuminated after next engine start) |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
|
Monitor runs whenever following DTCs not present |
None |
TYPICAL MALFUNCTION THRESHOLDS
|
ECM power source |
Less than 3.5 V |
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. 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 FUSE (EFI NO. 1) |
(a) Remove the EFI NO. 1 fuse from the engine room relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
EFI NO. 1 fuse |
Always |
Below 1 Ω |
|
|
2. |
CHECK HARNESS AND CONNECTOR (EFI NO. 1 FUSE - ECM, BATTERY) |
(a) Check the harness and the connector between the EFI NO. 1 fuse and ECM.
(1) Remove the EFI NO. 1 fuse from the engine room relay block.
(2) Disconnect the ECM connector.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
EFI NO. 1 fuse terminal 2 - A27-1 (BATT) |
Always |
Below 1 Ω |
|
EFI NO. 1 fuse terminal 2 or A27-1 (BATT) - Body ground |
Always |
10 kΩ or higher |
(b) Check the harness and the connector between the EFI NO. 1 fuse and battery.
(1) Remove the EFI NO. 1 fuse from the engine room relay block.
(2) Disconnect the positive battery terminal.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Battery positive (+) terminal - EFI NO. 1 fuse terminal 1 |
Always |
Below 1 Ω |
|
Battery positive (+) terminal or EFI NO. 1 fuse terminal 1- Body ground |
Always |
10 kΩ or higher |
|
|
3. |
INSPECT BATTERY |
(a) Check that the battery is not depleted
.
OK:
Battery is not depleted
|
|
4. |
CHECK BATTERY TERMINAL |
(a) Check that the battery terminals are not loose or corroded.
OK:
Battery terminals are not loose or corroded
|
|
5. |
CHECK WHETHER DTC OUTPUT RECURS |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream ON.
(d) Clear DTCs
.
(e) Turn the ignition switch off and turn the Techstream OFF.
(f) Start the engine.
(g) Turn the Techstream ON.
(h) Enter the following menus: Powertrain / Engine / Trouble Codes.
(i) Read DTCs.
Result
|
Result |
Proceed to |
|---|---|
|
P0560 is output |
A |
|
No DTC is output |
B |
|
|
|