0387162 JOHNSON PROPELLER,14-1/2 x 21

Table 1
Diagnostic Codes Table
Description Conditions which Generate this Code System Response
171-3 Ambient Air Temperature Sensor : Voltage Above Normal The ECM detects a duty cycle that is greater than 96 percent for 10 seconds. The code is logged.
171-4 Ambient Air Temperature Sensor : Voltage Below Normal The ECM detects a duty cycle that is less than 4 percent for 10 seconds. The code is logged.
171-8 Ambient Air Temperature Sensor : Abnormal Frequency, Pulse Width, or Period The ECM detects a sensor frequency that is greater than 600 Hz or less than 400 Hz. The code is logged.
1491-3 Right Turbo Turbine Inlet Temperature Sensor : Voltage Above Normal The ECM detects a duty cycle that is greater than 96 percent for 10 seconds. The code is logged.
If the signal from the other exhaust temperature sensor is OK, the signal from that sensor is used. If the signal from the other exhaust temperature sensor is not OK, a default value of 0 °C (32 °F) is used.
1491-4 Right Turbo Turbine Inlet Temperature Sensor : Voltage Below Normal The ECM detects a duty cycle that is less than 4 percent for 10 seconds.
1491-8 Right Turbo Turbine Inlet Temperature Sensor : Abnormal Frequency, Pulse Width, or Period The ECM detects a sensor frequency that is greater than 600 Hz or less than 400 Hz.
1492-3 Left Turbo Turbine Inlet Temperature Sensor : Voltage Above Normal The ECM detects a duty cycle that is greater than 96 percent for 10 seconds. The code is logged.
If the signal from the other exhaust temperature sensor is OK, the signal from that sensor is used. If the signal from the other exhaust temperature sensor is not OK, a default value of 0 °C (32 °F) is used.
1492-4 Left Turbo Turbine Inlet Temperature Sensor : Voltage Below Normal The ECM detects a duty cycle that is less than 4 percent for 10 seconds.
1492-8 Left Turbo Turbine Inlet Temperature Sensor : Abnormal Frequency, Pulse Width, or Period The ECM detects a sensor frequency that is greater than 600 Hz or less than 400 Hz. System OperationUse this procedure to troubleshoot any suspect problems with the following sensors:
Ambient air temperature sensor
Sensor for the left turbocharger turbine inlet temperature
Sensor for the right turbocharger turbine inlet temperatureThe Pulse Width Modulated Sensor (PWM sensor) provides a signal to the engine ECM. The PWM signal can represent certain engine operating conditions. The sensors receive 8.0 0.4 VDC from a regulated power supply from the engine ECM.An automatic calibration of these sensors is performed whenever the engine ECM is powered and the engine has been off for at least 5 seconds.The ECM provides short circuit protection for the internal power supply. A short circuit to the battery will not damage the internal power supply.The following components can cause problems with the power supply:
Electrical connector or wiring
Sensor
ECMThe most likely cause of a problem in the circuit is a problem with an electrical connector or wiring. The least likely cause is a problem with the ECM.
Illustration 1 g01794459
Schematic of the PWM sensors for the sensor signal circuit
Illustration 2 g01430666
Location of the connectors that are for the sensor signal circuits (left side engine view)
(1) J2/P2 ECM connector
(2) Right rail connector
(3) Left rail connector
(4) J1/P1 ECM connector
Illustration 3 g01430713
Location of the connectors that are for the sensor signal circuit (left rear engine view)
(5) Machine interface connector
Illustration 4 g01312207
Location of the temperature sensors for the inlet of the turbocharger turbines (top front engine view)
(6) Exhaust sensor for the left turbocharger turbine inlet temperature
(7) Exhaust sensor for the right turbocharger turbine inlet temperature
Illustration 5 g01794516
Terminal locations at the P1 ECM connector that are for the sensors for the turbocharger turbine inlet temperature
(P1-1) Ambient air temperature
(P1-18) Digital return
Illustration 6 g01279871
Terminal locations at the P2 ECM connector that are for the sensors for the turbocharger turbine inlet temperature
(P2-29) Digital supply
(P2-65) Left turbocharger turbine inlet temperature
(P2-73) Right turbocharger turbine inlet temperature
(P2-92) Digital return
Illustration 7 g01430736
Terminal locations at the left rail connector that are for the sensor for the left turbocharger turbine inlet temperature
(Terminal 23) Ambient air temperature
(Terminal 28) Digital supply
(Terminal 31) Digital return
(Terminal 38) Left turbocharger turbine inlet temperature