WARNING/INDICATION/ALARM

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Low fuel warning light/Low fuel warning indication

Purpose

•  The low fuel warning light/low fuel warning indication warns the driver that the remaining fuel level is low.

Functions

Low fuel warning light

•  The body control module (BCM) calculates the fuel tank level based on the following signals and when a fuel tank level of approx.9 L {2 US gal, 2 Imp gal} (fuel gauge indicates remaining 2 segments) is detected, it sends a low fuel warning light request signal to the instrument cluster.

Signal name	Sending module/part name	Communication method
Fuel gauge sender unit voltage signal	Electrical supply unit (ESU)	CAN
Fuel injection amount signal	PCM	CAN
Vehicle speed signal	Electronically controlled brake unit

•  The instrument cluster turns on the low fuel tank warning light based on the low fuel warning light request signal received from the body control module (BCM).

Low fuel warning indication

•  The body control module (BCM) calculates the fuel tank level based on the following signals and when a fuel tank level of approx.11 L {2.9 US gal, 2.4 Imp gal} (fuel gauge indicates remaining 7 segments) is detected, it sends a low fuel warning request signal to the instrument cluster.

Signal name	Sending module/part name	Communication method
Fuel gauge sender unit voltage signal	Electrical supply unit (ESU)	CAN
Fuel injection amount signal	PCM	CAN
Vehicle speed signal	Electronically controlled brake unit

•  The instrument cluster displays the fuel tank level warning display based on the low fuel warning request signal received from the body control module (BCM).

Structure/Construction

•  The low fuel warning light is built into the instrument cluster.

•  The low fuel warning indication is displayed in the multi-information display.

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•  A warning message in the center display is displayed when the low fuel warning light/low fuel warning indication is displayed/turned on. For the message content and verification method, refer to the [CENTER DISPLAY] in the workshop manual.

•  For vehicles with the multi-information display, a warning message is displayed in the multi-information display simultaneously with the low fuel warning indication. For the message content and verification method, refer to the [MULTI-INFORMATION DISPLAY]. (See MULTI-INFORMATION DISPLAY.)

Operation

Low fuel warning light

1.  When the body control module (BCM) receives any of the following signals with the ignition switched ON (engine off or on), it calculates the fuel tank level (1).

•  Fuel gauge sender unit voltage signal

•  Fuel injection amount signal

•  Vehicle speed signal

2.  If the calculated fuel tank level based on each signal is approx. 9 L {2 US gal, 2 Imp gal} or less, the body control module (BCM) sends (2) a low fuel warning light request signal to the instrument cluster.

3.  The instrument cluster turns on (3) the transistor based on the low fuel warning light request signal received from the body control module (BCM).

4.  When the transistor turns on, a ground circuit with the low fuel warning light is established and the low fuel warning light turns on (4).

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Low fuel warning indication

1.  When the body control module (BCM) receives any of the following signals with the ignition switched ON (engine off or on), it calculates the fuel tank level (1).

•  Fuel gauge sender unit voltage signal

•  Fuel injection amount signal

•  Vehicle speed signal

2.  If the calculated fuel tank level based on each signal is approx. 11 L {2.9 US gal, 2.4 Imp gal} or less, the body control module (BCM) sends (2) a low fuel warning request signal to the instrument cluster.

3.  The instrument cluster displays (3) the fuel tank level warning display on the multi-information display based on the low fuel warning request signal received from the body control module (BCM).

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