Jeep Grand Cherokee WK. Manual — part 980

P0461-FUEL LEVEL SENSOR 1 PERFORMANCE (CONTINUED)

3.

(A109) FUSED B+ CIRCUIT

Using a 12-volt test light connected to ground, probe the (A109) Fused
B+ circuit.

Does the test light illuminate brightly?

Yes

>> Go To 4

No

>> Repair the open or short to ground in the (A109) Fused

B+ circuit.

Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)

4.

(Z912), (Z210) GROUND CIRCUITS

Using a 12-volt test light connected to B+, probe the (Z912) and
(Z210) Ground circuits.

Does the test light illuminate brightly?

Yes

>> Go To 5

No

>> Repair the open in the (Z912) and (Z210) Ground circuits.

Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)

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ENGINE ELECTRICAL DIAGNOSTICS

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P0461-FUEL LEVEL SENSOR 1 PERFORMANCE (CONTINUED)

5.

(N4) FUEL LEVEL SIGNAL CIRCUIT OPEN

Turn the ignition off.

Disconnect the Fuel Pump Module harness connector.

Disconnect the C1 Cluster harness connector.

Measure the resistance of the (N4) Fuel Level Signal circuit from the
Fuel Pump Module harness connector to the C1 Cluster harness con-
nector.

Is the resistance below 5.0 ohms?

Yes

>> Go To 6

No

>> Repair the open in the (N4) Fuel Level Signal circuit.

Perform BODY VERIFICATION TEST-VER 1.

6.

(N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO GROUND

Measure the resistance between ground and the (N4) Fuel Level Sig-
nal circuit in the Fuel Pump Module harness connector.

Is the resistance below 100 ohms?

Yes

>> Repair the short to ground in the (N4) Fuel Level Signal

circuit.

Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)

No

>> Go To 7

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ENGINE ELECTRICAL DIAGNOSTICS

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P0461-FUEL LEVEL SENSOR 1 PERFORMANCE (CONTINUED)

7.

INTERNAL INSPECTION OF THE FUEL TANK

WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or ser-
vicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow
these instructions can result in personal injury or death.
Remove the Fuel Tank per Service Information.

Remove the Fuel Pump Module.

Visually inspect the inside of the Fuel Tank for any obstructions or deformities.

Inspect the Fuel Pump Module Float arm for damage.

Were any problems found?

Yes

>> Repair or replace as necessary.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

No

>> Go To 8

8.

FUEL LEVEL SENSOR

If there are no possible causes remaining, view repair.

Repair

Replace the Fuel Level Sensor.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

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P0462-FUEL LEVEL SENSOR 1 CIRCUIT LOW

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ENGINE ELECTRICAL DIAGNOSTICS

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