• | 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 sender readings. The Fuel Level (%) parameter is available on the scan tool in the PCM Enhanced EVAP data list. |
The number(s) below refer to the step number(s) in the diagnostic table.
This step tests for a high resistance in the signal circuit and the low reference circuit of the fuel level sender.
DTCs will be set in the PCM when performing this test.
Step | Action | Value(s) | Yes | No | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Instrument Cluster Diagnostic System Check? | -- | Go to Step 2 | |||||||||
2 |
Important: Verify the J 33431-C resistance settings with a DMM Does the fuel gauge display the correct fuel level? | -- | Go to Step 4 | Go to Step 3 | ||||||||
Important: Verify the J 33431-C resistance settings with a DMM Does the scan tool display the correct fuel level %? | -- | Go to Step 11 | Go to Step 5 | |||||||||
4 | Inspect for the following items:
Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 7 | ||||||||
5 | Test the signal circuit of the fuel level sender for a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 6 | ||||||||
6 | Test the low reference circuit of the fuel level sender for a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 9 | ||||||||
7 |
Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 8 | ||||||||
8 |
Does the resistance change smoothly across the specified range? | -- | Go to Diagnostic Aids | Go to Step 10 | ||||||||
9 | Inspect for poor connections at the harness connector of the PCM/VCM. 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 13 | Go to Step 12 | ||||||||
10 | Replace the fuel level sender. Refer to Fuel Level Sensor Replacement in Engine Controls - 4.3L or Fuel Level Sensor Replacement in Engine Controls - 4.8L, 5.3L, 6.0L. Did you complete the replacement? | -- | Go to Step 13 | -- | ||||||||
11 | Replace the instrument panel cluster. Refer to Instrument Cluster Replacement . Did you complete the replacement? | -- | Go to Step 13 | -- | ||||||||
12 |
Important: Program the replacement PCM/VCM. Replace the PCM/VCM. Refer to VCM Replacement/Programming in Engine Controls - 4.3L or Powertrain Control Module Replacement in Engine Controls - 4.8L, 5.3L, 6.0L. Did you complete the replacement? | -- | Go to Step 13 | -- | ||||||||
Did you correct the condition? | -- | System OK | Go to Step 2 |
• | 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 . |
• | Refer to Fuel Level Specifications in order to verify the correct fuel level sender readings. The Fuel Tank Level Remaining % parameter is available on the scan tool in the PCM Enhanced Evap data list. |
The number(s) below refer to the step number(s) on the diagnostic table.
This step tests for high resistance in the signal circuits and the low reference circuit of the fuel level senders.
DTCs will be set in the PCM when you perform this diagnostic table.
Step | Action | Value(s) | Yes | No | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
SCHEMATIC REFERENCE: Engine Controls Schematics in Engine Controls - 4.8L, 5.3L and 6.0L | ||||||||||||
1 | Did you perform the Instrument Cluster Diagnostic System Check? | -- | Go to Step 2 | |||||||||
2 |
Important: Verify the J 33431-C resistance settings with a DMM. Does the fuel gauge 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 scan tool display the correct fuel level %? | -- | Go to Step 11 | Go to Step 5 | |||||||||
4 | Inspect for the following items:
Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 7 | ||||||||
5 | Test the signal circuits of the fuel level senders for a high resistance between C152 and the PCM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 6 | ||||||||
6 | Test the low reference circuit of the fuel level senders for a high resistance between C152 and the PCM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 9 | ||||||||
7 |
Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 8 | ||||||||
8 |
Does the resistance change smoothly across the specified range? | 40-250 ohms | Go to Diagnostic Aids | 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 13 | Go to Step 12 | ||||||||
10 | Replace the primary or the secondary fuel level sender. Refer to Fuel Level Sensor Replacement in Engine Controls - 4.8L, 5.3L and 6.0L. Did you complete the replacement? | -- | Go to Step 13 | -- | ||||||||
11 | Replace the IPC. Refer to Instrument Cluster Replacement . Did you complete the replacement? | -- | Go to Step 13 | -- | ||||||||
12 |
Important: Program the replacement PCM. Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls - 4.8L, 5.3L and 6.0L. Did you complete the replacement? | -- | Go to Step 13 | -- | ||||||||
Did you correct the condition? | -- | System OK | Go to Step 2 |