62-61753-21
126 CHECK FUEL SENSOR (FLS)
TRIGGER-ON: The fuel level signal is less than 2% for 30 seconds.
UNIT CONTROL: Engine operation: Alarm Only.
Standby operation: This alarm does not activate in standby.
RESET CONDITION: Auto Reset when fuel level signal above 4% for 30 seconds or, alarm may be
manually reset via keypad or by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, the active
alarm should clear itself (refer to reset condition above). Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
a. Check fuel level in the tank.
a. Inspect sensor & connector pins &
terminals. (See wiring schematic
Section 10.)
No physical damage to sensor.
No damaged or corroded pins in plug.
b. Energize sensor circuit.
c. Check for voltage at the sensor
plug between pins A (+) and B
(ground).
d. Locate and inspect 10-way con-
nector for optional sensors and
switches.
Refer to Note 2 Page 7-2.
Voltage should be approximately 12 VDC.
If OK, go to step e. If not, continue with this step.
Connector must have cap on.
No corrosion or moisture inside connector.
Check for power between terminals A (+) & B
(Ground). Voltage should be approximately 12VDC.
Repair wiring as required.
e. Reconnect the fuel level sensor
plug. Check for voltage between
2MP-4 and ground.
Voltage should be greater than 0.24 VDC and less
than 5 VDC, unless the sensor is completely dry.
Check Circuits With Another Sensor
a. Substitute known good sensor and
clear alarm. Start unit and run for
30 seconds.
b. Check to see if alarm re-occurs.
Alarm should not come on. (Install new sensor if nec-
essary)
NOTE: If new sensor is not available, the sensor may be configured OFF temporarily. Refer to Section 5.1.1 -
Configurations.)
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