83783M Mariner POWERHEAD ASS'Y, COMPLETE (SEE NOTE)

Table 1
J1939 Code and Description CDL Code and Description Comments
190-8
Engine Speed Sensor : Abnormal Frequency, Pulse Width, or Period 190-8
Engine Speed Sensor : Abnormal Frequency, Pulse Width, or Period The code is logged against the primary speed sensor (crank/speed timing A). The Electronic Control Module (ECM) can default to the secondary engine speed/timing sensor. The default will occur if a valid signal is not received from the primary engine speed/timing sensor. The engine will shut down only if the signals from the primary engine speed/timing sensor and the secondary engine speed/timing sensor are abnormal.
723-8
Engine Speed Sensor #2 : Abnormal Frequency, Pulse Width, or Period 342-8
Secondary Engine Speed Sensor : Abnormal Frequency, Pulse Width, or Period The code is logged against the secondary speed sensor (camshaft/speed timing B). If a valid signal is not received from the secondary engine speed/timing sensor, the ECM will default to the primary engine speed/timing sensor. The engine will shut down only if the signals from the primary engine speed/timing sensor and the secondary engine speed/timing sensor are abnormal. Refer to the main engine schematic for pinout locations of the speed/timing sensors.
Table 2
Troubleshooting Test Steps Values Results
1. Check the Engine Speed/Timing Circuit
A. Connect Cat® Electronic Technician (ET) to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools".
B. Turn the keyswitch to ON.
C. Start the engine and run the engine.
Note: The problem may occur when the engine is at any operating temperature. However, the problem is more likely to occur when the engine is at the normal operating temperature.
Speed/Timing Circuit
Result: The engine started.
Proceed to Test Step 2.
Result: The engine did not start.
Proceed to Test Step 3.
2. Check for Codes
A. While the engine is running, monitor Cat ET for diagnostic codes. Also monitor the "Engine Starting" screen for an engine speed/timing that is "Not Detected".
B. Wait at least 30 seconds for activation of the diagnostic codes. Look for these codes on Cat ET:
• 190-8
• 342-8
• 723-8
Codes
Result: There is an active diagnostic code or there is a timing pattern that is "Not Detected".
Proceed to Test Step 5.
Result: There is not an active diagnostic code and there is not a timing pattern that is "Not Detected".
Repair: Download the "Product Status Report" from the engine ECM. Troubleshoot any diagnostic codes that may be present.
Return the unit to service.
3. Check the Battery Voltage
A. Monitor the "Engine Starting" screen in Cat ET.
B. Monitor the "Battery Voltage". Crank the engine for 5 seconds.
Battery Voltage
Result: The battery voltage is OK.
Proceed to Test Step 4.
Result: The battery voltage is not OK.
Repair: Refer to Troubleshooting, "Engine Cranks but Does Not Start".
4. Check the Engine Speed and the Engine Speed/Timing Status
A. Monitor the "Engine Starting" screen in Cat ET.
B. Crank the engine for 5 seconds. While the engine is cranking, verify that the sensors show an acceptable cranking speed.
C. While the engine is cranking, check the status of the engine speed/timing.
Speed/Timing Status
Result: The sensors show an acceptable cranking speed. The timing pattern shows "Detected".
Repair: Refer to Troubleshooting, "Engine Cranks but Does Not Start".
Result: A sensor does not show an acceptable cranking speed and/or the timing pattern shows "Not Detected".
Proceed to Test Step 5.
5. Check the Speed/Timing Sensor
A. Turn the keyswitch to OFF.
B. Visually inspect the sensor and the sensor assembly without removing the sensor assembly from the engine. Flanges must be flush against the surface of the front timing gear housing to ensure proper operation.
C. Inspect bracket. Verify that the bracket securely holds the flanges of the sensors flush against the engine.
D. Verify that the bracket is not bent. If the bracket is bent or if an obstruction is preventing the sensor assembly from being installed correctly, the engine will not start.
E. Disconnect the harness from the speed/timing sensors. Check the harness for debris and for corrosion.
F. Perform a 45 N (10 lb) pull test on the harness wiring.
Speed/Timing Sensor
Result: The sensor and the sensor assembly mounting are OK. Do not reconnect the harness connector.
Proceed to Test Step 6.
Result: The sensor and/or the sensor assembly has a mechanical problem or the harness has debris and/or corrosion.
Repair: Repair the sensor and/or the sensor assembly or replace the sensor and/or the sensor assembly. Replace the sensor and the sensor harness connector if there was debris and/or corrosion.
Verify that the problem is resolved.
6. Use a Multimeter to Check the Harness Wiring
A. Disconnect the affected speed/timing sensor from the wiring harness.
B. Turn the keyswitch to ON.
C. Perform substeps D-E for the affected sensor.
D. Measure the voltage between terminal 3 (5V SUPPLY) and terminal 2 (RETURN). The voltage should be 5V +/-.2V.
E. Measure the voltage between terminal 1 (SIGNAL) and terminal 2 (RETURN). The voltage should be 4.8V +/- 0.3V.
Check Wiring Harness
Result: The voltage was OK for all the measurements.
Repair: Replace the affected speed/timing sensor.
Result: The voltage was not OK for at least one of the measurements. There is a problem in the harness wiring.
Repair: Repair the appropriate harness wiring or replace the appropriate harness.
Verify that the problem is resolved.
If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).