2000 Toyota MR2FACTORY OEM SERVICE PROCEDURE

Camry CNG Models

  1. Remove glove box for access to ECM. For illustration of ECM location, see THEORY & OPERATION article. Note ECM electrical connector terminals. See Figure.
  2. Turn ignition on. Using voltmeter, check voltage between terminals No. 18 (Brown wire) at ECM electrical connector E6 and No. 10 (Light Green/Black wire) at ECM electrical connector E5. This is the E2 and THCNG1 terminals at ECM.
  3. Voltage should be as specified in relation to the temperature. See FUEL TANK FUEL TEMPERATURE SENSOR VOLTAGE SPECIFICATIONS  table.
    FUEL TANK FUEL TEMPERATURE SENSOR VOLTAGE SPECIFICATIONS

    Temperature Voltage
    -22°F (-30°C) .56-.45
    77°F (25°C) 3.39-3.29
    104°F (40°C) 4.00-3.90
    212°F (100°C) 4.85-4.82
  4. If voltage is not within specification, go to next step. If voltage is within specification, check for an intermittent problem in wiring harness and electrical connectors between ECM and fuel tank fuel temperature sensor. Fuel tank fuel temperature sensor is located on end of fuel tank behind rear seat, near fuel tank fuel shutoff valve. See Fig 1.
  5. Check fuel tank fuel temperature sensor. See FUEL TANK FUEL TEMPERATURE SENSOR  under ENGINE SENSORS & SWITCHES. If fuel tank fuel temperature sensor is okay, go to next step. If fuel tank fuel temperature sensor is defective, replace fuel tank fuel temperature sensor.
  6. Check for open and short in wiring harness and electrical connectors between ECM and fuel tank fuel temperature sensor. See WIRING DIAGRAMS article. If wiring harness or electrical connector is defective, repair as necessary. If wiring harness and electrical connectors are okay, check ECM ground circuit. See WIRING DIAGRAMS article. If ECM ground circuit is defective, repair ground circuit as necessary. If ECM ground circuit is okay, replace ECM.
    Fig 1: Locating Fuel Tank Fuel Temperature Sensor, Fuel Tank Fuel Shutoff Valve & Fuel Tank Valve Assembly (Camry CNG Models)
    G99G52817Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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