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DI-270
DIAGNOSTICS - ENGINE (1GR-FE)
DIDTV-01

DTC P0560 System Voltage

MONITOR DESCRIPTION
The battery supplies electricity to the ECM even when the ignition switch is OFF. This electricity allows the
ECM to store data such as DTC history, freeze frame data, fuel trim values, and other data.
If the battery voltage falls below a minimum level, the ECM will conclude that there is a fault in the power
supply circuit. The next time the engine starts, the ECM will turn on the MIL and a DTC will be set.
DTC No. DTC Detecting Condition Trouble Area
S Open in back-up power source circuit
P0560 Open in back up power source circuit S EFI No. 1 fuse
S ECM
HINT:
If DTC P0560 present, the ECM will not store another DTC.

MONITOR STRATEGY
Related DTCs P0560 System voltage malfunction
Required sensors/components ECM
Frequency of operation Continuous
Duration 3 sec.
MIL operation Immediate (*1)
Sequence of operation None
*1: The DTC is set immediate. The MIL will be illuminated after the engine starts in the next time.

TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever this DTC is
See page DI-18
not present
Stand-by RAM Initialized

TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria Threshold
Battery voltage Less than 3.5 V
DI-271
DIAGNOSTICS - ENGINE (1GR-FE)

WIRING DIAGRAM

ECM
Engine Room R/B
EFI No. 1 J/C
23 6 3
B B-R J26 J27 B-R BATT
2 2 E3
1 2

Battery

A23573

INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other
data from the time when a malfunction occurred.

1 Check battery voltage.

PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch to ON.
(c) Select the item: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / BATTERY VOLTAGE.
CHECK:
Read the battery voltage on the hand-held tester
RESULT:
Battery voltage Proceed to
0V A
Except 0 V B

B Go to step 5.

A
DI-272
DIAGNOSTICS - ENGINE (1GR-FE)

2 Check EFI No. 1 fuse of engine room J/B.

Engine Room J/B: PREPARATION:
Remove the EFI No. 1 fuse from the engine room J/B.
CHECK:
Check the resistance of the EFI No. 1 fuse.
OK:
Standard: Below 1

EFI
NG Check for short in all harness and components
No. 1 Fuse
A23509
connected to EFI No. 1 fuse and replace the
fuse.

3 Check voltage between terminal BATT and E1 of ECM connector.

CHECK:
Measure the voltage between terminals of the E5 and E3 ECM
E5 E3 connectors.
OK:
Standard:
Tester Connection Specified Condition
BATT (E3-3) - E1 (E5-1) 9 to 14 V
E1(-) BATT(+)
B17411
OK Check for intermittent problems
(See page DI-11).

NG
DI-273
DIAGNOSTICS - ENGINE (1GR-FE)

4 Check for open and short in harness and connector between ECM and EFI No. 1
fuse, EFI No. 1 fuse and battery.

Engine Room J/B: PREPARATION:
(a) Remove the EFI No. 1 fuse from the engine room J/B.
(b) Disconnect the E3 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tor.
OK:
EFI
Standard:
No. 1 Fuse
A23509 Tester Connection Specified Condition
Engine Room J/B (EFI No. 1 fuse
Below 1
terminal 2) - BATT (E3-3)
E3
Engine Room J/B (EFI No. 1 fuse
terminal 2) or BATT (E3-3) - 10 k or higher
Body ground

ECM Connector

BATT B17417

NG Repair or replace harness or connector.

5 Check the battery (See page CH-1).

NG Replace battery.

Check and replace engine room J/B.

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