Test Description

The number below refers to the step number on the diagnostic table.

3: Tests for the proper operation of the circuit in the low voltage range.

DTC P0463

Step	Action	Values	Yes	No
Schematic Reference: Instrument Cluster Schematics Connector End View Reference: Master Electrical Component List in Wiring Systems
1	Did you perform the Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2	Install the scan tool. Turn the ignition ON, with the engine OFF. With the scan tool, observe one of the following fuel level parameters: Fuel Tank Level Remaining parameter in the powertrain control module (PCM) Enhanced evaporative emission (EVAP) Data, data list-gas only. Fuel Level Sensor parameter in the PCM Fuel System data list - 6.6L diesel only. Does the scan tool indicate that the Fuel Tank Level Remaining parameter is less than the specified value or the Fuel Level Sensor parameter is greater than the specified value?	4% 4.5 V - 6.6L diesel only	Go to Step 3	Go to Diagnostic Aids
3	Turn the ignition OFF. Disconnect C152. Connect a 3-amp fused jumper wire between the signal circuit of the fuel level sender and the low reference circuit of the fuel level sender on the male terminal side. Turn the ignition ON, with the engine OFF. With the scan tool, clear the DTCs. With the scan tool, observe the Fuel Level parameter. Does the scan tool indicate that the Fuel Tank Level Remaining parameter is greater than the specified value or the Fuel Level Sensor parameter is less than the specified value?	98% 0.5 V - 6.6L diesel only	Go to Step 6	Go to Step 4
4	Test the signal circuit of the fuel level sensor for an open, for a high resistance, or for a short to voltage. Refer to Circuit Testing andWiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 12	Go to Step 5
5	Test the low reference circuit of the fuel level sensor for an open, for a high resistance, or for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 12	Go to Step 9
6	Test the signal circuit of the fuel level sensor for an open, for a high resistance, or for a short to voltage between C152 and the fuel level sensor. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 12	Go to Step 7
7	Test the low reference circuit of the fuel level sensor for an open, for a high resistance, or for a short to voltage between C152 and the fuel level sensor. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 12	Go to Step 8
8	Inspect for poor connections at the harness connector of the fuel level sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 12	Go to Step 10
9	Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 12	Go to Step 11
10	Replace the fuel level sensor. Refer to the following procedures: Fuel Level Sensor Replacement in Engine Controls - 4.3L Fuel Level Sensor Replacement (4.8L, 5.3L, and 6.0L Engines) in Engine Controls - 4.8L, 5.3L, and 6.0L Fuel Level Sensor Replacement (Cab/Chassis - Rear Tank) in Engine Controls - 6.6L (LLY) Fuel Level Sensor Replacement in Engine Controls - 8.1L Did you complete the replacement?	-	Go to Step 12	-
11	Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement?	-	Go to Step 12	-
12	Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset?	-	Go to Step 2	System OK