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Test E: Tank Temperature Sensor Circuit Short To Power

WARNING: This page is about a different car, the 2002 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: After making any repairs, clear DTCs and retest system.
  1. Turn ignition switch to LOCK position. Connect New Generation Star (NGS) tester to Data Link Connector (DLC). DLC is located below center of instrument panel, right of steering column. Turn ignition switch to RUN position. Access PID/DATA MONITOR AND RECORD. Select Natural Gas Vehicle Module (NGVM) PID TEMPS1. If temperature is 199°F, go to next step. If temperature is not 199°F, inspect for loose, damaged or corroded harness connectors and harness connector terminals. Clear DTCs. Test system for normal operation. If DTC B1224 is retrieved again, go to step  4.
  2. Turn ignition switch to LOCK position. Disconnect NGVM harness connector C1009. NGVM is located on center radiator support behind radiator. Disconnect fuel tank temperature sensor harness connector C4128. Fuel tank temperature sensor is located in rear of in-bed fuel tank solenoid valve. Turn ignition switch to RUN position. Measure voltage at NGVM harness connector C1009 between terminals No. 40 (Black/Yellow wire) and No. 46 (Brown wire). See Figure. If voltage is 0.5 volt or less, go to next step. If voltage is more than 0.5 volt, repair short to voltage in Brown wire between NGVM and fuel tank pressure sensor. See WIRING DIAGRAMS .
  3. Measure voltage at NGVM harness connector C1009 between terminals No. 40 (Black/Yellow wire) and No. 47 (Light Green/Red wire). If voltage is 0.5 volt or less, go to next step. If voltage is more than 0.5 volt, repair short to voltage in Light Green/Red wire between NGVM and fuel tank temperature sensor. See WIRING DIAGRAMS .
  4. Disconnect NGVM harness connector C1009. Inspect for pushed out terminals and corrosion. Reconnect NGVM harness connector, ensuring it is connected correctly. Operate system and verify if concern still exists. If concern still exists, replace NGVM. See NATURAL GAS VEHICLE MODULE  under REMOVAL & INSTALLATION. If concern does not exist, system is operating correctly at this time. Clear DTCs and repeat self-test.
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