DTC P0462 - Fuel Level Sensor Circuit Low Input -

WARNING: This page is about a different variant/trim than selected.

DTC DETECTING CONDITION:
- Two consecutive driving cycles with malfunction

CAUTION: After repair or replacement of malfunctioning parts, conduct Clear Memory Mode < Ref. to OPERATION , CLEAR MEMORY MODE > and INSPECTION MODE < Ref. to OPERATION , INSPECTION MODE. >

WIRING DIAGRAM:

Fig 1: Fuel Level Sensor Wiring Diagram
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK SPEEDOMETER AND TACHOMETER OPERATION IN COMBINATION METER.	Does speedometer and tachometer operate normally?	Go to step 2.	Repair or replace combination meter. < Ref. to COMBINATION METER SYSTEM . >
2 CHECK INPUT SIGNAL FOR ECM. Turn ignition switch to ON. (Engine OFF) Measure voltage between ECM connector and chassis ground. Connector & terminal (B135) No. 25 (+) - Chassis ground (-):	Is the measured value less than 0.12 V?	Go to step 6.	Go to step 3.
3 CHECK INPUT SIGNAL FOR ECM. (USING SUBARU SELECT MONITOR.) Read data of fuel level sensor signal using Subaru Select Monitor. NOTE: Subaru Select Monitor For detailed operation procedure, refer to the "READ CURRENT DATA FOR ENGINE". < Ref. to SUBARU SELECT MONITORS . >	Is the measured value Less than 0.12 V when shaking harness and connector of ECM?	Repair poor contact in ECM connector.	Even if MIL lights up, the circuit has returned to a normal condition at this time. A temporary poor contact of the connector may be the cause. NOTE: In this case, repair the following: Poor contact in combination meter connector Poor contact in ECM connector Poor contact in coupling connectors
4 CHECK INPUT VOLTAGE OF ECM. Turn ignition switch to OFF. Separate fuel tank cord connector (R57) and rear wiring harness connector (R15). Turn ignition switch to ON. Measure voltage of harness between ECM connector and chassis ground. Connector & terminal (B135) No. 25 (+) - Chassis ground (-):	Is the measured value more than 0.12 V?	Go to step 4.	Go to step 7.
5 CHECK HARNESS BETWEEN ECM AND COMBINATION METER. Turn ignition switch to OFF. Disconnect connector from connector (i10) and ECM connector. Measure resistance between ECM and chassis ground. Connector & terminal (B135) No. 25 - Chassis ground:	Is the measured value more than 1 MΩ?	Go to step 6.	Repair ground short circuit in harness between ECM and combination meter connector.
6 CHECK HARNESS BETWEEN ECM AND COMBINATION METER. Measure resistance between ECM and combination meter connector. Connector & terminal (B135) No. 25 - (HO) No. 3:	Is the measured value less than 10 Ω?	Repair or replace combination meter. < Ref. to COMBINATION METER SYSTEM . >	Repair open circuit between ECM and combination meter connector. NOTE: In this case, repair the following: Poor contact in coupling connector
7 CHECK FUEL TANK CORD. Turn ignition switch to OFF. Disconnect connector from fuel sub level sensor. Measure resistance between fuel sub level sensor and chassis ground. Connector & terminal (R59) No. 1 - Chassis ground:	Is the measured value more than 1 MΩ?	Go to step 8.	Repair ground short circuit in fuel tank cord.
8 CHECK FUEL TANK CORD. Disconnect connector from fuel pump assembly. Measure resistance between fuel pump assembly and chassis ground. Connector & terminal (R59) No. 2 - Chassis ground:	Is the measured value more than 1 MΩ?	Go to step 9.	Repair ground short circuit in fuel tank cord.
9 CHECK FUEL LEVEL SENSOR. WARNING: During work procedures, if fuel tank is more than 3/4 full, be careful because fuel may spill. Remove fuel pump assembly. < Ref. to FUEL PUMP . > Measure resistance between fuel level sensor and terminals with its float set to the full position. Terminals No. 3 - No. 6:	Is the measured value within 0.5 to 2.5 Ω?	Go to step 10 .	Replace fuel level sensor.
10 CHECK FUEL SUB LEVLE SENSOR. WARNING: During work procedures, if fuel tank is more than 3/4 full, be careful because fuel may spill. Remove fuel sub level sensor. < Ref. to FUEL SUB LEVEL SENSOR . > Measure resistance between fuel sub level sensor and terminals with its float set to the full position. Terminals No. 1 - No. 2:	Is the measured value within 0.5 to 2.5 Ω?	Repair poor contact in harness between ECM and combination meter connector.	Replace fuel sub level sensor.