FUEL SENSOR FAULTED LOW (BCM)

For a complete wiring diagram Refer to Section 8W

When Monitored:
Ignition on and battery voltage above 10.4 volts.
Set Condition:
The fuel level sensor signal voltage goes below 0.0196 of a volt for more than 90 seconds.

Possible Causes

FUEL LEVEL SENSOR VOLTAGE BELOW 0.0196 OF A VOLT

FUEL LEVEL SENSOR

(N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO GROUND

(N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT

PCM

Diagnostic Test

1.FUEL LEVEL SENSOR VOLTS BELOW 0.0196 VOLT

Is the Fuel Level Sensor voltage below 0.0196 of a volt?

Yes

Go To2

Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 5. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

2.FUEL LEVEL SENSOR

Did the Fuel Level Sensor voltage change from below 0.4 of a volt to above 4.0 volts?

Yes

Replace the Fuel Level Sensor in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Go To3

3.DETERMINE VEHICLE ENGINE TYPE

What type of engine is the vehicle equipped with?

Gas

Go To 4

Gas (ESP)

Go To 7

Diesel

Go To 10

4.(N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO GROUND

Is the resistance below 100 ohms?

Yes

Repair the short to ground in the (N4) Fuel Level Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Go To5

5.(N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND

Is the resistance below 5.0 ohms?

Yes

Repair the short between the (K900) Sensor ground and the (N4) Fuel Level Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Go To6

6.PCM

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

If there are no possible causes remaining, view repair.

Repair

Replace and program the Powertrain Control Module per Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

7.(N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO GROUND

Is the resistance below 100 ohms?

Yes

Repair the short to ground in the (N4) Fuel Level Signal circuit.
Perform BODY VERIFICATION TEST VER - 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

Go To8

8.(N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO THE (K310) SENSOR GROUND

Is the resistance below 5.0 ohms?

Yes

Repair the short between the (K310) Sensor ground and the (N4) Fuel Level Signal circuit.
Perform BODY VERIFICATION TEST VER - 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

Go To9

9.BCM

NOTE: Before continuing, check the BCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

If there are no possible causes remaining, view repair.

Repair

Replace and program the Body Control Module per Service Information.
Perform BODY VERIFICATION TEST VER - 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

10.(K304) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO GROUND

Is the resistance below 100 ohms?

Yes

Repair the short to ground in the (K304) Fuel Level Signal circuit.
Perform BODY VERIFICATION TEST VER - 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

Go To11

11.(K304) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO THE (K300) SENSOR GROUND

Is the resistance below 5.0 ohms?

Yes

Repair the short between the (K300) Sensor ground and the (N304) Fuel Level Signal circuit.
Perform BODY VERIFICATION TEST VER - 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

Go To12

12.PCM

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

If there are no possible causes remaining, view repair.

Repair

Replace and program the Powertrain Control Module per Service Information.
Perform BODY VERIFICATION TEST VER - 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)