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Test D: Fuel Tank Temperature Sensor Circuit Open (DTC B1223)

WARNING: This page is about a different car, the 2002 Ford Econoline. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition switch to LOCK position. Connect New Generation Star (NGS) tester to Data Link Connector (DLC). DLC is located below driver's side of instrument panel, to right of steering column. Turn ignition switch to ON position. Using NGS tester, monitor Natural Gas Vehicle (NGV) module PID TEMPS1. If PID indicates 199°F (93°C), go to next step. If PID does not indicate 199°F (93°C), check connectors for loose and corroded terminals. Repair connectors as necessary. Retest system operation. If connectors are okay, clear DTCs. Using NGS tester, perform data link diagnostic self-test for NGV module. See DATA LINK DIAGNOSTIC TEST under SELF-DIAGNOSTIC SYSTEM in MODULE COMMUNICATIONS NETWORK - ECONOLINE article. If DTC B1223 is retrieved again, replace NGV module. See NATURAL GAS VEHICLE MODULE  under REMOVAL & INSTALLATION. Retest system operation.
  2. Turn ignition switch to LOCK position. Disconnect fuel tank temperature sensor 2-pin harness connector C3124. Fuel tank temperature sensor is located in center fuel tank solenoid valve. See Figure. Disconnect NGV module 60-pin harness connector C1009. NGV module is located on left inner fender well, behind coolant recovery bottle. Connect NGV module 60-pin harness connector C1009 to 60-pin Breakout Box (014-00322) following manufacturer's instructions. Leave NGV module disconnected from breakout box. Measure resistance between fuel tank temperature sensor 2-pin harness connector C3124 Gray/Red wire terminal and breakout box pin No. 46. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Gray/Red wire. See WIRING DIAGRAMS . Retest system operation.
  3. Measure resistance between fuel tank temperature sensor 2-pin harness connector C3124 Orange/Light Green wire terminal and breakout box pin No. 47. If resistance is less than 5 ohms, replace fuel tank temperature sensor. See FUEL TANK TEMPERATURE SENSOR  under REMOVAL & INSTALLATION. Retest system operation. If resistance is 5 ohms or more, repair open in Orange/Light Green wire. See WIRING DIAGRAMS . Retest system operation.
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