• | Ensure that the fuel level is in the same range as the customer concern. |
• | For intermittent diagnosis, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
• | Refer to Fuel Level Specifications in order to verify the correct fuel level sensor readings. The Fuel Level parameter is available on the scan tool in the Powertrain Fuel and Emissions data list. The Fuel Gage Position parameter is available in the Body Control Module Accessory data list. |
The numbers below refer to the step number on the diagnostic table.
This step tests for a high resistance in the signal circuit and the low reference circuit of the fuel level sensor.
DTCs will be set in the engine control module (ECM)/powertrain control module (PCM) when you perform this diagnostic table.
Step | Action | Value(s) | Yes | No | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Instrument Cluster Schematics | ||||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | ||||||||
2 |
Important: Verify the J 33431-C resistance settings with a DMM. Does the fuel gage display the correct fuel level? | -- | Go to Step 4 | Go to Step 3 | ||||||||
Important: Verify the J 33431-C resistance settings with a DMM. Important: Turn OFF the ignition momentarily between the resistance settings in order to quickly update the scan tool display. Does the Fuel Level parameter display the correct fuel level amount? | -- | Go to Step 9 | Go to Step 5 | |||||||||
4 | Inspect for the following items:
Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 7 | ||||||||
5 | Test the signal circuit of the fuel level sensor for a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 6 | ||||||||
6 | Test the low reference circuit of the fuel level sensor for a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 10 | ||||||||
7 |
Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 8 | ||||||||
8 |
Does the resistance change smoothly across the specified range on both fuel level sensors? | 20-125 ohms | Go to Diagnostic Aids | Go to Step 11 | ||||||||
9 |
Important: Verify the J 33431-C resistance settings with a DMM. Important: Turn the ignition OFF momentarily between the resistance settings in order to quickly update the scan tool display. Does the Fuel Gage Position parameter match the Fuel Level parameter? | -- | Go to Step 12 | Go to Step 14 | ||||||||
10 | Inspect for poor connections at the harness connector of the engine control module (ECM)/powertrain control module (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 15 | Go to Step 13 | ||||||||
11 | Replace the fuel level sensor with the abnormally high resistance. Refer to the following procedures:
Did you complete the replacement? | -- | Go to Step 15 | -- | ||||||||
12 | Replace the instrument panel cluster (IPC). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 15 | -- | ||||||||
13 | Replace the ECM/PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 15 | -- | ||||||||
14 | Replace the body control module (BCM). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 15 | -- | ||||||||
Did you correct the condition? | -- | System OK | Go to Step 2 |