Fuel Gage Inaccurate or Inoperative Single Fuel Tank
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Does the gauge respond correctly? | -- | Go to Step 2 | Go to Step 5 |
2 | Check CKT 350 (BLK) from fuel sender or fuel sender and fuel pump to ground for high resistance. Is resistance high? | -- | Go to Step 3 | Go to Step 4 |
3 | Repair or replace CKT 350 (BLK) between the fuel tank and ground. Is the repair complete? | -- | System OK | -- |
4 | Replace the fuel sender. Is the repair complete? | -- | System OK | -- |
5 | Check CKT 30, CKT 386, and CKT 24 (PPL) for high resistance between the fuel sender and the IP cluster connector. Is the resistance high? | -- | Go to Step 6 | Go to Step 7 |
6 | Repair or replace CKT 30, CKT 386, or CKT 24 (PPL) between the fuel tank and the IP cluster. Is the repair complete? | -- | System OK | -- |
7 | Replace the fuel gauge. Refer to Instrument Cluster Replacement . Is the repair complete? | -- | System OK | -- |
Fuel Gage Inaccurate or Inoperative Dual Fuel Tanks
Step | Action | Value(s) | Yes | No |
1 |
Important: Allow time for the gauge to reach its final position due to the anti-slosh device. Did the gauge indicate approximately the capacity of the LH fuel tank? | -- | Go to Step 9 | Go to Step 2 |
2 |
Important: Allow time for the gauge to reach FULL due to the anti-slosh device. Did the gauge respond correctly? | -- | Go to Step 3 | Go to Step 6 |
3 | Check CKT 350 (BLK) for high resistance between the LH tank connector and chassis ground. Was there high resistance in CKT 350? | -- | Go to Step 5 | Go to Step 4 |
4 | Replace the fuel gauge sender. Is the repair complete? | -- | System OK | -- |
5 | Repair or replace CKT 350 (BLK) between the LH fuel tank connector and chassis ground. Is the repair complete? | -- | System OK | -- |
6 |
Did either circuit show high resistance? | -- | Go to Step 7 | Go to Step 8 |
7 | Repair or replace CKT 30, CKT 386, or CKT 24 (PPL) or CKT 1936 (DK BLU). Is the repair complete? | -- | System OK | -- |
8 | Replace the fuel gauge. Refer to Instrument Cluster Replacement . Is the repair complete? | -- | System OK | -- |
9 |
Does the gauge indicate the approximate capacity of the RH fuel tank? | -- | Go to Step 10 | Go to Step 11 |
10 | Replace the fuel sender and balance pump control module. Is the repair complete? | -- | System OK | -- |
11 |
Important: Allow time for the gauge to reach its final position due to the anti-slosh device. Did the gauge respond correctly? | -- | Go to Step 12 | Go to Step 15 |
12 | Check CKT 350 (BLK) for high resistance between the LH tank connector and ground. Is there high resistance in CKT 350? | -- | Go to Step 13 | Go to Step 14 |
13 | Repair or replace CKT 350 between the LH tank connector and ground. Is the repair complete? | -- | System OK | -- |
14 | Replace the fuel sender and fuel pump assembly. Is the repair complete? | -- | System OK | -- |
15 | Locate and repair the open in CKT 1937 (LT BLU) between the fuel sender and balance pump control module harness connector and the RH fuel tank harness connector. Is the repair complete? | -- | System OK | -- |
Fuel Gage Inaccurate or Inoperative Vehicle Runs Out at Half Tank
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Does the fuel pump run? | -- | Go to Step 3 | Go to Step 2 |
2 | Replace the fuel transfer pump assembly. Is the repair complete? | -- | System OK | -- |
3 | Connect a J 39200 DMM between the fuel transfer pump harness connector terminal A, and chassis ground. Does the DMM indicate continuity? | -- | Go to Step 5 | Go to Step 4 |
4 | Locate and repair the open in CKT 350 (BLK) between the fuel transfer pump harness connector and G 408. Is the repair complete? | -- | System OK | -- |
5 |
Did the DMM indicate continuity? | -- | Go to Step 7 | Go to Step 6 |
6 | Locate and repair CKT 120 (GRY) between the fuel transfer pump, and the fuel transfer pump relay. Is the repair complete? | -- | System OK | -- |
7 |
Did the test lamp light? | -- | Go to Step 9 | Go to Step 8 |
8 | Locate and repair the open in CKT 145, CKT 139 (PNK) between the IP fuse block and the fuel transfer pump relay. Is the repair complete? | -- | System OK | -- |
9 |
Did the test lamp light? | -- | Go to Step 11 | Go to Step 10 |
10 | Locate and repair the open in CKT 139 (PNK) between S417 and the fuel transfer pump relay. Is the repair complete? | -- | System OK | -- |
11 |
Does the DMM indicate continuity? | -- | Go to Step 13 | Go to Step 12 |
12 | Locate and repair the open in CKT 497 (LT GRN) between the fuel sender and balance pump control module and the fuel transfer pump relay. Is the repair complete? | -- | System OK | -- |
13 |
Did the test lamp light? | -- | Go to Step 15 | Go to Step 14 |
14 | Replace the fuel transfer pump relay. Is the repair complete? | -- | System OK | -- |
15 | Connect a test lamp between the fuel sender and balance pump control module connector terminal A and chassis ground. Did the test lamp light? | -- | Go to Step 17 | Go to Step 16 |
16 | Locate and repair the open in CKT 139 (PNK) between S417 and the fuel sender and balance pump control module. Is the repair complete? | -- | System OK | -- |
17 | Connect a J 39200 between the fuel sender and balance pump control module connector terminal E and chassis ground. Does the DMM indicate continuity? | -- | Go to Step 18 | Go to Step 19 |
18 | Replace the fuel sender and balance pump control module. Is the repair complete? | -- | System OK | -- |
19 | Locate and repair the open in CKT 350 (BLK) between S415 and the fuel sender and balance pump control module. Is the repair complete? | -- | System OK | -- |
