Camry CNG Models
- Remove glove box for access to ECM. For illustration of ECM location, see THEORY & OPERATION article. Note ECM electrical connector terminals. See Figure.
- Turn ignition on. Using voltmeter, check voltage between VC and E2 terminals at ECM for fuel pipe fuel pressure sensor. See ECM TERMINAL IDENTIFICATION FOR FUEL PIPE FUEL PRESSURE SENSOR table.ECM TERMINAL IDENTIFICATION FOR FUEL PIPE FUEL PRESSURE SENSOR
ECM Terminal ECM Connector ECM Terminal No. (Wire Color) E2 E6 18 (Brown Wire) PCNG1 E6 11 (Green/Red Wire) VC E6 2 (Yellow) - Voltage should be 4.5-5.5 volts. If voltage is within specification, go to next step. If voltage is not within specification, 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.
- Ensure ignition is on. Using voltmeter, check voltage between PCNG1 and E2 terminals at ECM for fuel pipe fuel pressure sensor. See ECM TERMINAL IDENTIFICATION FOR FUEL PIPE FUEL PRESSURE SENSOR table.
- Voltage should be as specified in relation fuel gauge reading. See FUEL PIPE FUEL PRESSURE SENSOR VOLTAGE SPECIFICATIONS table.FUEL PIPE FUEL PRESSURE SENSOR VOLTAGE SPECIFICATIONS
Fuel Gauge Reading Voltage @ 68°F (20°C) Full 3.3 3/4 2.7 1/2 2.0 1/4 1.3 - If voltage is not within specification, go to next step. If voltage is within specification, 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.
- Check for open and short in wiring harness and electrical connectors between ECM and fuel pipe fuel pressure sensor. See WIRING DIAGRAMS article. Fuel pipe fuel pressure sensor is located near fuel pressure regulator located in fuel line between fuel tank and fuel rail, just below brake booster. See Fig 1.
- If wiring harness and electrical connectors are okay, replace fuel pipe fuel pressure sensor. See FUEL PIPE FUEL PRESSURE SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL, OVERHAUL & INSTALLATION - 4-CYLINDER article. If wiring harness or electrical connector is defective, repair as necessary.