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Test I: Ecu Defective (DTC B1342)

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. Disconnect NGVM harness connector C1009. NGVM is located on center radiator support behind radiator. Check for loose, damaged or corroded NGVM terminals and harness connector terminals. If there is no damage, go to next step. If any module or harness connector terminals are damaged, repair as necessary and go to step  4.
  2. Ensure NGVM harness connector C1009 is disconnected. Turn ignition switch to ON position. Measure voltage at NGVM harness connector C1009 between terminals No. 37 (Red wire) and No. 40 (Black/Yellow wire). See Figure. If voltage is 10.5 volts or less, go to next step. If voltage is more than 10.5 volts, go to step  4.
  3. Turn ignition switch to LOCK position. Measure resistance between ground and NGVM harness connector C1009 terminal No. 40 (Black/Yellow wire). If resistance is 5 ohms or less, repair open in Red wire between NGVM and battery junction box. If resistance is more than 5 ohms, repair open in Black/Yellow wire between NGV timer and ground. Ground point is located in right side of engine compartment, by firewall. See WIRING DIAGRAMS .
  4. Disconnect NGVM harness connector C1009. NGVM is located on center radiator support behind radiator. 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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