0339044 JOHNSON GASKET, Thermostat to cyl.

Illustration 1 g00743863
Typical schematic
Illustration 2 g01090780
P1 ECM connector (P1-12) Timing calibration - (P1-18) Timing calibration + (P1-29) Digital return (P1-32) +V timing (P1-38) Engine speed/timing signalTest Step 1. Inspect Electrical Connectors and Wiring
Turn the keyswitch to the OFF position.
Thoroughly inspect the ECM connectors J1/P1. Inspect the connector J20/P20 for the engine speed/timing sensor. Refer to Troubleshooting, "Inspecting Electrical Connectors" 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 of 6.0 N m (55 lb in).
Check the customer connector (allen head screw) for the proper torque of 2.25 0.25 N m (20 2 lb in).
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, and of pinch points.Results:
OK - The harness and wiring are OK. Proceed to Test Step 2.
Not OK - There is a problem in 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 Active Diagnostic Codes
Connect Cat ET to the cab service tool connector J42. Start Cat ET.
Turn the keyswitch to the ON position.
Check for active diagnostic codes for the engine speed/timing sensor on Cat ET.Expected Result:Cat ET indicates that none of the following diagnostic codes are active:
190-02
190-03
190-08Results:
OK - No active diagnostic codes are present.Repair: The problem may have been resolved in the preceding test step. If the problem is intermittent, refer to Troubleshooting, "Inspecting Electrical Connectors".STOP
OK - The 190-02 diagnostic code or the 190-03 diagnostic code is present. Proceed to Test Step 3.
OK - The 190-08 diagnostic code is present.Repair: When the timing gear is installed backward, the ECM generates a diagnostic code of 190-08. If this code is active, the ECM will not fire the injectors. Reinstall the timing gear.STOPTest Step 3. Check the Engine RPM on Cat ET
Turn the keyswitch to the ON position. Start the engine, when possible.
Crank the engine. Observe the engine speed on Cat ET.Expected Result:Cat ET displays a steady engine speed between 100 and 250 rpm while the engine is cranking.Results:
OK - Cat ET displays a steady engine speed between 100 and 250 rpm while the engine is cranking. The engine speed/timing sensor is operating normally at this time.Repair: The problem may have been resolved in the preceding test step. If the problem is intermittent, refer to Troubleshooting, "Inspecting Electrical Connectors".STOP
Not OK - Cat ET does not display a steady engine speed between 100 and 250 rpm while the engine is cranking. Cat ET does not display the correct engine rpm signal. Proceed to Test Step 4.Test Step 4. Check the Supply Voltage to the Engine Speed/Timing Sensor
Disconnect the connector for the engine speed/timing sensor J20/P20.
Turn the keyswitch to the ON position.
Measure the voltage at the connector for the engine speed/timing sensor between J20-A and J20-B.Expected Result:The supply voltage is 12.5 0.5 VDC.Results:
OK - The supply voltage is 12.5 0.5 VDC. The engine speed/timing sensor is receiving the correct supply voltage. Proceed to Test Step 5.
Not OK - The supply voltage is not 12.5 0.5 VDC. The supply voltage is incorrect. Proceed to Test Step 10.Test Step 5. Check the Engine Speed/Timing Sensor
Be sure to extend the sliphead before you install the Engine Speed/Timing Sensor. Also check that the Timing Gear is in a position that will not allow the sliphead of the Engine Speed/Timing Sensor to protrude into one of the slots of the Timing Gear. This is done visually with a flashlight prior to the installation of the Engine Speed/Timing Sensor. Turn the crankshaft to rotate the Timing Gear, if necessary, to position the gear in a place that will not allow the sliphead to protrude into a slot. If the sensor sliphead does protrude into one of the slots, the sliphead wll be broken off as the gear begins to rotate.
Turn the keyswitch to the OFF position.
Disconnect connector J20/P20 and remove the engine speed/timing sensor.
Inspect the plastic sliphead for damage.
Check the tension. Gently extend the sliphead 3.5 mm (0.14 inch). Return the sliphead to the original position.
Extend the sliphead.
Install the engine speed/timing sensor.Expected Result:The sliphead takes at least 22 N (5 lb) of force to push in the sliphead from the extended position.Results:
OK - The engine speed/timing sensor and the sliphead are undamaged. The tension on the sliphead is normal. Reinstall the engine speed/timing sensor. Proceed to Test Step 6.
Not OK - The engine speed/timing sensor or the sliphead is damaged and/or the sliphead has insufficient tension.Repair: Replace the engine speed/timing sensor. Calibrate the engine speed/timing sensor. Refer to Troubleshooting, "Engine Speed/Timing Sensor - Calibrate".STOPTest Step 6. Check the Signal Voltage at the Engine Speed/Timing Sensor
Reconnect all connectors.
Remove the signal wire in J20-C from the connector for the engine speed/timing sensor. Remove the wire from the harness side of the connector.
Install a breakout T at the connector for the engine speed/timing sensor.
Crank the engine and measure the voltage between P20-C and P20-B on the breakout T.
Turn the keyswitch to the OFF position.
Reinsert the sensor signal wire back into J20-C. Remove the breakout T.Expected Result:The voltage measu