803663 8 Mercury GASKET

Table 1
Diagnostic Codes
CDL Code and Description Conditions which Generate this Code System Response
3134-3
Aftertreatment #1 SCR Catalyst Reagent Tank #1 Temperature Sensor:Voltage Above Normal The code is for the main tank temperature sensor.
The Electronic Control Module (ECM) detects a signal voltage that is not in the acceptable range. The code is logged.
The value of the parameter is set to a default value.
Dosing is disabled until the pressure is correct.
3134-4
Aftertreatment #1 SCR Catalyst Reagent Tank #1 Temperature Sensor:Voltage Below Normal The code is for the main tank temperature sensor.
The ECM detects a signal voltage that is not in the acceptable range. System OverviewThe sensor signal for the passive sensor is routed from the ECM to terminal 1 of each sensor connector. The sensor return for the passive sensors is routed from the ECM to terminal 2 of each sensor connector.Diagnostics on the Caterpillar Electronic Technician (ET)Wiggle Test - The Wiggle Test allows you to monitor the status of the signals from the sensors.For additional information regarding the Wiggle Test, refer to the documentation that accompanies the Cat ET software.
Illustration 1 g03550823
Schematic for the passive sensors
Illustration 2 g01155187
Terminal locations at the connector for the passive analog sensors
(Terminal 1) Sensor signal
(Terminal 2) Analog return Test Step 1. Check for Diagnostic Codes
Connect Cat ET to the service tool connector.
Turn the keyswitch to the ON position.
Access the "Active Diagnostic Code" screen on Cat ET.
Look for these active codes or logged codes:
-3
-4Results:
Logged Code - A diagnostic code is logged. Proceed to Test Step 4.
Active -3 - A -3 diagnostic code is active. Proceed to Test Step 2.
Active -4 - A -4 diagnostic code is active. Proceed to Test Step 3.Test Step 2. Create a Short at the Sensor Connector
Turn the keyswitch to the OFF position.
Disconnect the suspect sensor.
Install the jumper wire between terminal 1 (sensor signal) and terminal 2 (sensor return) at the sensor connector.
Turn the keyswitch to the ON position.
Monitor the diagnostic codes on Cat ET. Check for an active -4 diagnostic code for the suspect sensor.
Turn the keyswitch to the OFF position. Results:
Active -3 - The -3 diagnostic code remains active for the suspect sensor.Repair: There is an open in the harness. Repair the wiring or replace the harness.Verify that the problem is resolved.STOP
Active -4 - A -4 diagnostic code became active after creating the short at the sensor connector.Repair: The wiring is OK. Replace the sensor.Verify that the problem is resolved.STOPTest Step 3. Create an Open at the Suspect Sensor Connector
Turn the keyswitch to the OFF position.
Disconnect the sensor connector of the suspect sensor with the active -4 diagnostic code.
Turn the keyswitch to the ON position.
Monitor the diagnostic codes on Cat ET. Check for an active -3 diagnostic code for the suspect sensor.
Turn the keyswitch to the OFF position. Results:
Active -4 - The -4 diagnostic code remains active for the suspect sensor.Repair: There is a short in the harness. Repair the wiring or replace the harness.Verify that the problem is resolved.STOP
Active -3 - A -3 diagnostic code became active after disconnecting the sensor.Repair: The wiring is OK. Replace the sensor.Verify that the problem is resolved.STOPTest Step 4. Perform the Wiggle TestCarefully following this procedure is the best way to identify the root cause of an intermittent problem.
Turn the keyswitch to the ON position.
Use Cat ET to run the "Wiggle Test".
Slowly wiggle the wiring and the connectors between the P2 connector and the sensor. Slowly wiggle the wiring and the connectors between the P1 connector and the sensor. Pay particular attention to the wiring near each connector. Be sure to wiggle all of the wiring. As you wiggle the wiring look for the following problems:
Loose connectors or damaged connectors
Moisture on the connectors or the wiring
Damage that is caused by excessive heat
Damage that is caused by chafing
Improper routing of wiring
Damaged insulationResults:
The wiring failed the wiggle test. - Repair: There is a problem with the wiring. Repair the wiring or replace the wiring.Verify that the problem is resolved.STOP
The wiring passed the Wiggle Test. - Repair: The problem may be intermittent. Inspect the wiring. Refer to Troubleshooting, "Electrical Connectors - Inspect".If the wiring is OK, perform the following procedure:
Turn the keyswitch to the OFF position.
Disconnect the connectors. Carefully inspect the terminals for proper installation. Ensure that each terminal is clean and dry.
Insert a pin into each socket. Verify that each socket grips the pin firmly. Repair any problems.
Connect all connectors.
Verify that the problem is resolved.
Return the unit to service. STOP