Test 68B - Fuel Gauge/Lamp Empty At All Times
NOTE:
Perform TEST 68A
before proceeding with this test. For connector terminal ID, see CONNECTOR IDENTIFICATION
. For wiring schematics, see WIRING DIAGRAMS
in this article. Perform TEST VER-1 - VERIFICATION PROCEDURE
after each repair.
CAUTION:
Always turn ignition off prior to disconnecting any module connector.
- Turn ignition on. Using scan tool, read ignition voltage status. If voltage is 0.0 volts, go to TEST 68C . If voltage is not 0.0 volts, go to next step.
- Disconnect flex fuel module connector. Flex fuel module is located in trunk, behind rear seat. Connect jumper wire between ground and terminal No. 4 (Dark Blue wire) on flex fuel module connector. Using scan tool, read fuel level voltage. If voltage is one volt or greater, go to next step. If scan tool displays less than one volt, go to step 4).
- Access Body Control Module (BCM) Gray connector. BCM is located behind right kick panel. DO NOT disconnect connectors. Backprobe jumper wire between ground and terminal No. 23 (Dark Blue wire) on BCM Gray connector. Read fuel level voltage. If scan tool displays less than one volt, repair open Dark Blue wire. If voltage is one volt or greater, replace BCM.
- Disconnect jumper wire. Using scan tool in ohmmeter mode, measure resistance at terminal No. 5 (Black/Tan wire) on flex fuel module connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open Black/Tan wire.
- Using scan tool in voltmeter mode, measure voltage at terminal No. 6 (Red/White wire) on flex fuel module connector. If voltage is greater than 10 volts, go to next step. If voltage is 10 volts or less, repair open Red/White wire.
- Disconnect fuel pump connector. Using external ohmmeter, measure resistance between terminal No. 2 (Light Blue/Red wire) on flex fuel module connector and terminal No. 3 (Black/Tan wire) on fuel pump connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open Line 1 circuit between flex fuel module and fuel pump.
- Using external ohmmeter, measure resistance between terminal No. 3 (Light Blue/Black wire) on flex fuel module connector and terminal No. 2 (Dark Blue wire) on fuel pump connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open Line 2 circuit between flex fuel module and fuel pump.
- Connect fuel pump connector. Using external ohmmeter, measure resistance between terminals No. 2 (Light Blue/Red wire) and No. 3 (Light Blue/Black wire) on flex fuel module connector. If resistance is 1000 ohms or greater, replace fuel level sensor. If resistance is less than 1000 ohms, go to next step.
- Disconnect flex fuel module 8-pin connector to fuel tank and to main harness. See Fig 1 . Connect main harness 8-pin connector to fuel tank 8-pin connector, bypassing flex fuel module. If fuel gauge operates correctly, replace flex fuel module. If fuel gauge does not operate correctly, replace fuel level sensor.