P1861-SIPHON LINE DISCONNECTED

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the ignition key on.
Set Condition:
PCM compares the primary tank level with the secondary tank level. If the PCM detects the primary side is lower than the secondary side by a calibrated amount the DTC will set.

Possible Causes

DTC IS ACTIVE

FUEL TANK DAMAGE

FUEL LEVEL SIGNAL CIRCUIT SHORTED TO GROUND

FUEL LEVEL SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

(Z965) GROUND CIRCUIT OPEN OF HIGH RESISTANCE

INTERNAL DAMAGE TO FUEL TANK OR SIPHON HOSE

FUEL LEVEL SENSOR

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Diagnostic Test

1.DTC IS ACTIVE

NOTE: Diagnose any Fuel Level DTCs before proceeding with this test.

NOTE: The following test must be performed on both Fuel Level Sensors.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

Is the status Active for this DTC?

Yes

Go to2

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

2.FUEL TANK INSPECTION

Were any problems found?

Yes

Replace the Fuel Tank as necessary.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

Go to3

3.FUEL LEVEL SIGNAL CIRCUIT SHORTED TO GROUND

Is the resistance below 100 ohms?

Yes

Repair the Fuel Level Signal circuit for a short to ground.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

Go to4

4.FUEL LEVEL SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

Is the resistance below 5.0 ohms?

Yes

Go to5

Repair the Fuel Level Signal circuit for an open circuit or high resistance.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

5.(Z965) GROUND CIRCUIT OPEN OR HIGH RESISTANCE

Is the resistance below 5.0 ohms?

Yes

Go to6

Repair the (Z965) Ground circuit for an open circuit or high resistance.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

6.FUEL TANK AND SIPHON HOSE INSPECTION

WARNING: The fuel system is under a constant pressure even with the engine off. Before opening the fuel system, the fuel pressure must be released in accordance with the service information. Failure to follow these instructions can result in personal injury or death.

Were any problems found?

Yes

Repair or replace as necessary.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

Replace the Fuel Level Sensor.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).