CAT

The Speed/Timing signal for Engine/Speed Timing Sensor #1 indicates rpm but the timing pattern is lost.

The ECM has been replaced and the Engine/Speed Timing Sensors have not been calibrated.

The Engine Control Module (ECM) detects one of the following items after attempting to operate the injector:

•A low current condition (open circuit) exists in the wiring for the cylinder injector solenoid.
•A high current condition (short circuit) exists in the injector solenoid.

Probable Causes:

1) ECM Connection/Harness
2) Cylinder injector failure
3) Injector solenoid failure
4) Harness from ECM to valve cover connector
5) ECM failure
6) Injector harness under valve cover

The Engine Control Module (ECM) detects the following conditions:

•The primary speed/timing sensor and the secondary speed/timing sensor are off by more than three degrees.
•A timing calibration has been successfully completed.
•The battery voltage is above 9 V.

The engine uses two engine speed/timing sensors. Both of the engine speed/timing sensors detect the reference for engine speed and timing from a unique pattern on the camshaft gear. The Engine Control Module (ECM) counts the time between pulses that is created by the sensor as the gear rotates in order to determine rpm. The ECM remembers the pattern of the pulses. The ECM uses the pattern of the pulses in order to determine the position of the crankshaft.

When the timing has been established, the ECM triggers each injector in the correct firing order at the correct time.

The actual timing and duration of each injection is based on engine rpm and on load. If the engine is running and the signal from one of the camshaft position sensors is lost, no noticeable change in engine performance will be noticed.

The engine will start and the engine will run when only one sensor signal is present from either of the sensors. The loss of the signal from both of the sensors during engine operation will result in the termination of injection and the shutting down the engine by the ECM. The loss of the signal from both of the sensors during start-up will prevent the engine from starting.

Both sensors are magnetic sensors. The two sensors are not interchangeable. Do not switch the positions of the sensors. The two sensors must be replaced as a pair. If the sensors are replaced, a timing calibration is not necessary for the engine. Timing calibration is only necessary after replacing an ECM that will not communicate.

Probable Causes:

1) ECM Connection
2) Engine speed sensor failure or installed improperly
3) Engine speed sensor harness
4) ECM Failure

The Engine Control Module (ECM) detects the following conditions:

•A timing calibration has never been performed on a new ECM or the timing is off by more than three degrees.

The speed/timing sensors provide engine speed signals to the ECM. The signals are created as the timing gear on the camshaft rotates past the pickups of the engine speed/timing sensors. A unique pattern on the timing gear allows the ECM to determine the crankshaft position. This unique pattern on the gear allows the ECM to determine the top center position of the piston in the No. 1 cylinder. If the signal is lost from one of the sensors, a diagnostic code is generated. The ECM will use a special type of logic that will allow the engine to start on only one sensor.

Timing calibration is accomplished by installing a special magnetic pickup into the side of the engine block. The magnetic pickup senses a special slot on the crankshaft counterweight.

Note: The timing calibration will not increase the available engine power. Do not expect an increase in power due to the performance of the timing calibration.

You can only calibrate this using the CAT ET Software.

The theft deterrent feature has been enabled. The correct password must be entered in order to disable the theft deterrent. Then, the engine can be started.

The Engine Control Module (ECM) detects the following conditions:

•The engine is cranking.
•The theft deterrent is active.

The diagnostic code is active only. The diagnostic code will be active when the theft deterrent is enabled and the engine is cranking for more than five seconds. The engine will not start until the correct password is entered.

This condition indicates that the J1939 data link is receiving information from a specified device but the information is incomplete or corrupted. The parameter “Powertrain Data Link” must be programmed to J1939.

One of the following conditions must be met:

•The device is broadcasting a fault code.
•The Engine Control Module (ECM) is unsuccessful in receiving a specific message from a device.
•The device is broadcasting a code that is not supported.

The power train data link is designed to offer electronically controlled Anti-Lock Brakes (ABS), traction control systems, and/or transmission controls. This is accomplished by a momentary reduction of engine rpm and/or engine torque, that is triggered by a signal from an off-engine control module for the ABS, the traction control, or the transmission. An off-engine control module is a control module that is not part of theCaterpillar engine control system.

Possible Causes:

1) ECM Connection/Harness
2) Other devices on the J1939 (ABS, Body Controller, Transmission, etc…) are failing causing the issue
3) Improper programming in ECM
4) ECM Failure

This condition indicates that the SAE J1939 data link is not communicating correctly. The parameter “Powertrain Data Link” must be programmed to J1939.

The power train data link is designed to offer electronically controlled Anti-Lock Brakes (ABS), traction control systems, and/or transmission controls.

This is accomplished by a momentary reduction of engine rpm and/or engine torque, that is triggered by a signal from an off-engine control module for the ABS, the traction control, or the transmission. An off-engine control module is a control module that is not part of theCaterpillar engine control system.

Possible Causes:

1) ECM Connection/Harness
2) Other devices on the J1939 (ABS, Body Controller, Transmission, etc…) are failing causing the issue
3) Improper programming in ECM
4) ECM Failure