Astro, "C", "K" & "S" Series & Safari
- If gauge constantly reads "E" (empty), go to next step. If gauge constantly reads "F" (full), go to step 4). If gauge reading is inaccurate, go to step 6).
- Check for fuel in tank. If empty, fill tank with fuel. If gauge continues to indicate "E" (empty), check for a grounded fuel gauge circuit by disconnecting lead at fuel tank.
- Fuel gauge should now read past "F" (full) mark. If gauge does not read past "F" (full) mark, replace fuel gauge sending unit. If gauge still reads "E" (empty), find short to ground between gauge and fuel tank.
- If gauge reads "F" (full), check for an open circuit between gauge and sending unit by disconnecting sending lead at fuel tank. Connect lead to ground and note reading on gauge.
- If fuel gauge reads "E" (empty), replace fuel gauge sending unit. If fuel gauge still reads "F" (full) or beyond, find open wire between gauge and fuel tank.
- If gauge reading is inaccurate, check wiring for corroded or loose connections. Clean and tighten as required. If okay, remove fuel gauge sending unit. Using an ohmmeter, test sending unit resistance. See FUEL GAUGE SENDING UNIT RESISTANCE table.
- If sending unit values are correct, disconnect front body connector. Connect Gauge Tester (J-24538-A) to lead that goes to gauge. Turn ignition on. If gauge reads accurately, check wiring between rear compartment and front connector.
- If gauge reads between 1/4 and 1/2 full with tester set at 90 ohms, remove gauge and check for loose nuts at gauge terminals. If nuts are tight and gauge still reads inaccurately, replace fuel gauge.
FUEL GAUGE SENDING UNIT RESISTANCE
| Position | Ohms |
|---|---|
| Empty | 1 |
| 1/2 Full | 44 |
| Full | 88 |