DTCs are read using the EST or by counting the flashes from the amber and red ENGINE lamp.
DTC 311
EOT signal out-of-range low
• DTC 311 is set by the ECM when the EOT signal is less than 0.2 V for more than 0.35 second.
• DTC 311 can be set due to a sensor signal wire short to ground or a failed EOT sensor.
• When DTC 311 is active the amber ENGINE lamp is illuminated.
DTC 312
EOT signal out-of-range high
• DTC 312 is set by the ECM when the EOT signal is greater than 4.78 V for more than 0.35 second.
• DTC 312 can be set due to a signal or ground circuit open, a short to a voltage source, or a failed EOT sensor.
• When DTC 312 is active the amber ENGINE lamp is illuminated.
Tools
• EST with MasterDiagnostics® software
• EZ-Tech® interface cable
• Digital Multimeter (DMM)
• 3-Banana Plug Harness
• 500 Ohm Resistor Harness
• Breakout Box
• Breakout Harness
• Terminal Test Adapter Kit
