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 ACTIVENOTE: Diagnose any Fuel Level DTCs before proceeding with this test.
NOTE: The following test must be performed on both Fuel Level Sensors.
Inspect the Fuel Pump Module harness connectors for any corrosion or damage.
Start the engine and allow it to reach normal operating temperature.
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.
With the scan tool, select View DTCs.
Is the status Active for this DTC?
Yes
- Go to2
No
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
2. FUEL TANK INSPECTION
Inspect both sides of the Fuel Tank for any damage that may restrict the Fuel Level Sensor float.
Were any problems found?
Yes
- Replace the Fuel Tank as necessary.
- Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).
No
- Go to3
3. FUEL LEVEL SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the Fuel Pump Module harness connector.
Measure the resistance between ground and each Fuel Level Signal circuit at the Fuel Pump Module harness connector.
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).
No
- Go to4
4. FUEL LEVEL SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE
Disconnect the Cluster harness connector.
Measure the resistance of each Fuel Level Signal circuit from the Fuel Pump Module harness connector to the Cluster harness connector.
Is the resistance below 5.0 ohms?
Yes
- Go to5
No
- 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
Measure the resistance between ground and the (Z965) Ground circuit in the Fuel Pump Module harness connector.
Is the resistance below 5.0 ohms?
Yes
- Go to6
No
- 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.
Inspect the following components.
- Siphon hose for restrictions or being disconnected.
- Siphon Inlet and Outlet tube on the Fuel Modules for restrictions.
- Fuel Pump Inlet Strainers for restrictions.
- Fuel Tank for any obstructions or deformities.
- Fuel Pump Module Float arm for damage.
Were any problems found?
Yes
- Repair or replace as necessary.
- Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).
No
- Replace the Fuel Level Sensor.
- Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).