11837M Mariner SCREW

Table 1
Diagnostic Codes Table
Code and Description Conditions which Generate this Code System Response
190-2 Engine Speed Sensor : Erratic, Intermittent, or Incorrect The engine speed signal cannot be detected. The timing gear pattern returns within one second before being lost and the battery voltage is greater than 9 VDC for the last two seconds. The code will be active and logged if the Electronic Control Module (ECM) detects an incorrect signal for one second. The battery voltage is greater than 9 VDC for the last two seconds. The secondary engine speed/timing signal will be used if the primary engine speed/timing signal is lost. The code is logged.
190-3 Engine Speed Sensor : Voltage Above Normal A wire on the engine speed/timing sensor is disconnected and/or broken. There is a short circuit to the +Battery terminal. The secondary engine speed/timing signal will be used if the primary engine speed/timing signal is lost. The code is logged.
190-7 Engine Speed Sensor : Not Responding Properly The primary engine speed/timing sensor is connected to the harness for the secondary engine speed/timing sensor. The code is active.
190-8 Engine Speed Sensor : Abnormal Frequency, Pulse Width, or Period The engine speed is greater than zero rpm and the pattern from the timing ring is incorrect for five seconds. The secondary engine speed/timing signal will be used if the primary engine speed/timing signal is lost.
The code is logged if the pattern from the timing ring returns for five seconds.
342-2 Secondary Engine Speed Sensor : Erratic, Intermittent, or Incorrect The engine speed signal cannot be detected. The timing gear pattern returns within one second before being lost and the battery voltage is greater than 9 VDC for the last two seconds. The code will be active and logged if the ECM detects an incorrect signal for one second. The battery voltage is greater than 9 VDC for the last two seconds. The primary engine speed/timing signal will be used if the secondary engine speed/timing signal is lost. The code is logged.
342-3 Secondary Engine Speed Sensor : Voltage Above Normal A wire on the engine speed/timing sensor is disconnected and/or broken. There is a short circuit to the +Battery terminal. The primary engine speed/timing signal will be used if the secondary engine speed/timing signal is lost. The code is logged.
342-7 Secondary Engine Speed Sensor : Not Responding Properly The secondary engine speed/timing sensor is connected to the harness for the primary engine speed/timing sensor. The code is active.
342-8 Secondary Engine Speed Sensor : Abnormal Frequency, Pulse Width, or Period The engine speed is greater than zero rpm and the pattern from the timing ring is incorrect for five seconds. The primary engine speed/timing signal will be used if the secondary engine speed/timing signal is lost.
The code is logged if the pattern from the timing ring returns for five seconds. The ECM provides the engine speed/timing sensors with a regulated voltage of 12.5 1 VDC. The engine speed/timing sensors provide a pulse signal to the ECM. The signal is created as the timing reference gear rotates past the pickup of the engine speed/timing sensors. The timing reference gear is mounted on the rear of the left camshaft. A unique tooth pattern on the timing reference gear allows the ECM to determine the crankshaft position, rotation, and rpm.The engine speed/timing sensors generate a pulse signal to the ECM as each tooth passes the sensors. The ECM counts the pulses in order to determine the engine rpm. The ECM memorizes the pattern of the pulses. The ECM compares that pattern to a standard pattern in order to determine the crankshaft position. The ECM uses this information to determine the position of the No. 1 cylinder. The ECM then triggers each unit injector to fire in the correct firing order and at the correct time. The actual timing and duration of each injection is determined by the ECM. The ECM uses engine rpm and engine load to determine the timing and duration of injection. The loss of a signal from an engine speed/timing sensor generates a diagnostic on Caterpillar Electronic Technician (ET). If the signals from both the primary engine speed/timing sensor and the secondary engine speed/timing sensor are lost, the ECM will terminate fuel injection.
Illustration 1 g01341116
Typical schematic
Illustration 2 g01328997
P1 ECM connector
(P1-13) Secondary engine speed/timing signal
(P1-33) Primary engine speed/timing signal
(P1-40) Engine timing calibration -
(P1-41) Engine timing calibration +
(P1-43) +12.5 V supply
(P1-51) Digital return Note: The timing calibration sensor is only on the J1/P1 connector for the primary ECM.Test Step 1. Inspect Electrical Connectors and Wiring
Remove electrical power from the ECM.
Thoroughly inspect the ECM connector J1/P1. Inspect all of the other connectors for the circuit. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
Check the ECM connector (allen head screw) for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the harness and the wiring for abrasion and for pinch points. Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion or of pinch points.Results:
OK - The harness and connectors appear to be OK. Proceed to Test Step 2.
Not OK - There is a problem with the connectors and/or wiring.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the problem.STOPTest Step 2. Check for an "ACTIVE" or "LOGGED"Diagnostic Code
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Restore electrical power to the ECM.
Check the diagnostic codes on Cat ET. Expected Result:No diagnostic codes are active