14249A 1 Mercruiser COVER, CRANKCASE FRONT

Table 1
J1939 Code and Description CDL Code and Description System Response
1180-3
Engine Turbocharger 1 Turbine Inlet Temperature : Voltage Above Normal 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.
1180-4
Engine Turbocharger 1 Turbine Inlet Temperature : Voltage Below Normal 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.
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.
1180-8
Engine Turbocharger 1 Turbine Inlet Temperature : Abnormal Frequency, Pulse Width, or Period 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.
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.
1181-3
Engine Turbocharger 2 Turbine Inlet Temperature : Voltage Above Normal 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.
1181-4
Engine Turbocharger 2 Turbine Inlet Temperature : Voltage Below Normal 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.
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.
1181-8
Engine Turbocharger 2 Turbine Inlet Temperature : Abnormal Frequency, Pulse Width, or Period 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.
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. System OperationUse this procedure to troubleshoot any suspect problems with the sensor for the left turbocharger turbine inlet temperature or the right turbocharger turbine inlet temperature.The Pulse Width Modulated Sensor (PWM) provides a signal to the ECM. The PWM signal is used to represent certain engine operating conditions. The sensors receive 8.0 0.4 VDC from a regulated power supply.The ECM performs an automatic calibration of these sensors whenever the 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 is a problem with an electrical connector or wiring. The least likely cause is a problem with the ECM.
Illustration 1 g02604056
Schematic of the PWM sensors for the sensor signal circuit if equipped with A4 ECM
Illustration 2 g06323402
Schematic of the PWM sensors for the sensor signal circuit if equipped with A5 ECM
Illustration 3 g02604098
Location of the PWM sensors (top engine view)
(1) Sensor for the right turbocharger turbine inlet temperature
(2) Sensor for the left turbocharger turbine inlet temperature
Illustration 4 g02604176
Location of the connectors that are for the PWM sensor circuit (Front engine view)
(3) Right rail connector
(4) J2/P2connector for the secondary ECM
(5) J1/P1connector for the primary ECM
(6) Left rail connector
Table 2
Troubleshooting Test Steps Values Results
1. Check for an Active Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Monitor the diagnostic codes on Cat ET. Check and record any diagnostic codes.
Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
C. Determine if a diagnostic code has occurred several times.
Note: A diagnostic code that is logged several times is an indication of an intermittent problem. Most intermittent problems are the result of a bad connection between a socket and a pin in a connector. There could also be a bad connection between a wire and a terminal.
D. Look for one or more of the following diagnostic codes that are active or logged:
- 1180-3 or 1492-3
- 1180-4 or 1492-4
- 1180-8 or 1492-8
- 1181-3 or 1491-3
- 1181-4 or 1491-4
- 1181-8 or 1491-8
Codes
Results: No diagnostic codes are active.
Repair: There may be an intermittent problem in the harness or in a connector. If an intermittent problem is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct procedures for inspecting electrical connectors.
Results: One of the diagnostic codes that are listed above are active or logged.
The ECM detects a problem in one of the circuits for the exhaust temperature sensors.
Proceed to Test Step 2
2. Check the Digital Supply Voltage at the Sensor Connector
A. Remove the electrical power from the ECM.
B. Disconnect the suspect sensor at the sensor connector:
C. Restore the electrical power to the ECM.
D. Measure the supply voltage on the harness side of the sensor connector. Measure the voltage between terminal 1 and terminal 2 for the suspect sensor.
8.0 0.4 VDC