5033695 JOHNSON HOLDER

Illustration 1 g01150285
Schematic for speed/timing sensors
Test Step 1. CHECK FOR ACTIVE DIAGNOSTIC CODES
Ensure that the keyswitch is in the OFF position.
Connect Cat ET to the service tool connector.
Turn the keyswitch to the ON position.
Start the engine and run the engine. Allow the engine coolant temperature to reach normal operating temperature.
If the engine will not start, monitor the engine speed on Cat ET while the engine is being cranked. Cat ET may need to be powered from another battery while the engine is being cranked. This is done so that Cat ET will not reset. Note: Upon initial cranking, the status of the engine speed may indicate that the engine speed signal is abnormal. This message should be replaced with an engine speed once the ECM is able to calculate a speed from the signal.
Also check Cat ET for one of the following logged diagnostic codes or active diagnostic codes:
320-02
320-11
342-02
342-11Expected Result:None of the above codes are active or logged.Results:
OK - None of the codes are active or logged.Repair: Refer to the appropriate symptoms in Troubleshooting, "Troubleshooting Without a Diagnostic Code".STOP
No Engine rpm - Engine rpm is not indicated on Cat ET during engine cranking. Proceed to Test Step 2.
Active Code - One or more of the above codes are active or logged. Proceed to Test Step 4.Test Step 2. INSPECT THE SENSOR ASSEMBLY
Illustration 2 g01155019
Engine speed/timing sensors
(1) Bracket
(2) Secondary speed/timing sensor
(3) Mounting plate
(4) O-ring seals
(5) Bracket
(6) Primary speed/timing sensor
Remove the suspect engine speed/timing sensor from the engine.
Ensure that O-ring seals (4) are installed on each sensor and on the mounting plate. Ensure that the O-ring seals are free of damage.
Ensure that mounting brackets are holding the sensor securely to the engine and that the brackets are not damaged or bent. Expected Result:All of the O-ring seals are properly installed and free of damage. The bracket is free of damage.Results:
OK - The O-ring seals are properly installed. The bracket is free of damage.Repair: Perform the following procedure in order to properly install a sensor assembly:
Lubricate the O-ring seals with oil.
Fully seat each sensor into the housing.
Tighten the bracket bolt.
Connect the connector and verify that the latch tab of the connector is latched on both sides.
Ensure that the harness is properly secured, and ensure that the harness is attached to the harness clip. Proceed to Test Step 3.
Not OK - At least one of the sensor assembly's components is not OK.Repair: Replace the sensor assembly.Note: Do not switch the positions of the sensors. The sensors are not interchangeable. A timing calibration is not required when the sensors are replaced.
Lubricate each O-ring with oil.
Fully seat the sensor into the housing.
Tighten the bracket bolt.
Connect the connector and verify that the latch tab of the connector is latched on both sides.
Ensure that the harness is properly secured, and ensure that the harness is attached to the harness clip. Verify that the problem is resolved.STOPTest Step 3. INSPECT THE ELECTRICAL CONNECTORS AND THE WIRING
Turn the keyswitch to the OFF position.
Illustration 3 g01150316
C12 engine speed/timing sensors (typical example)
(7) J402/P402 connectors for the secondary engine speed/timing sensor
(8) J401/P401 connectors for the primary engine speed/timing sensor
(9) J2/P2 ECM connectors
Illustration 4 g01150313
3406E, C15, and C18 engine speed/timing sensors (typical example)
(7) J402/P402 connectors for the secondary engine speed/timing sensor
(8) J401/P401 connectors for the primary engine speed/timing sensor
(9) J2/P2 ECM connectors
Thoroughly inspect connectors (1), (2), and (3).
Illustration 5 g01150373
P2 connector
(P2-48) Primary engine speed/timing signal (+)
(P2-49) Primary engine speed/timing signal (−)
(P2-58) Secondary engine speed/timing signal (+)
(P2-59) Secondary engine speed/timing signal (−)
Perform a 45