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Fuel Gauge Test

WARNING: This page is about a different car, the 1997 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect a scan tool. Check if any DTC's exist. If any DTC's are present, go to TESTS W/CODES article in ENGINE PERFORMANCE section.
  2. Turn ignition off. Disconnect fuel gauge sender connector. Connect 2 Red leads from Gauge Tester (J 33431) to terminals "B" (Purple wire) and "D" (Black/White wire). Turn ignition on. Set tester resistance dials to zero ohms (empty), then 90 ohms (full). If fuel gauge does not display "E" at zero ohms and "F" at 90 ohms, go to next step. If fuel gauge displays "E" at zero ohms and "F" at 90 ohms, go to step 6).
  3. Remove IPC connector. Connect a DVOM between terminals B2 and B6 of IPC connector. While adjusting tester resistance dial, observe DVOM for a change in voltage while adjusting tester dial. If voltage changes with tester dial adjustment, check IPC connector for positive connections. If IPC connections are okay, replace IPC. If readings on DVOM do not change with tester dial adjustments, go to next step.
  4. Turn ignition off. Disconnect PCM harness connector C2. Using a DVOM, measure resistance between IPC connector B2 and ground. If resistance is greater than 5 ohms, go to next step. If resistance is less than 5 ohms, locate and repair short in Purple/White wire.
  5. Connect a DVOM between IPC connector terminal B2 and PCM connector C2 terminal No. 5. If resistance is greater than 5 ohms, locate and repair open in Purple/White wire. If resistance is less than 5 ohms, see TESTS W/CODES article in ENGINE PERFORMANCE section.
  6. Connect a scan tool and establish communications with PCM. While observing FUEL SENDER DATA on PCM, adjust tester dial between zero and 90 ohms. FUEL SENDER DATA changes with adjustment of tester dial, see TESTS W/CODES article in ENGINE PERFORMANCE section. If FUEL SENDER DATA does not change as specified, check for short in Purple wire and repair as necessary. If Purple wire is okay, check fuel sender ground circuit. If ground circuit is okay, replace fuel level sender.
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