LINK (RIGHT HAND) 1P3281 - Caterpillar

Table 1
J1939 Code and Description CDL Code and Description System Response
5562-1
Supplemental Fan Speed : Low - most severe (3) E1190 (3)
Low Aftertreatment Cooling Fan Speed The code is logged if the fan speed is not within 300 rpm of the commanded speed. On Motor Grader Applications, the code will be logged if communication for the CAN data link is lost between the Electronic Control Module (ECM) and the fan.
Table 2
Troubleshooting Test Steps Values Results
1. Inspect the Fan
A. Inspect the fan for the following conditions:
• Damaged fan blades
• Debris against the fan blades
• Air flow is obstructed
Fan
Result: The fan is OK.
Proceed to Test Step 2.
Result: The fan is obstructed.
Repair: Remove the obstruction. Verify that the problem is resolved.
Result: The fan is damaged.
Repair: Replace the fan. Verify that the problem is resolved.
If the problem is not resolved, proceed to Test Step 2.
2. Check the Fan for Proper Operation
A. Turn the keyswitch to OFF.
B. Disconnect the 4-pin wiring harness connector from the aftertreatment cooling fan.
C. Turn the keyswitch to ON.
D. Check to see if the fan is operational.
Fan
Result: The fan is operational with the 4-pin connector disconnected.
Repair: The aftertreatment cooling fan is OK. High temperatures under the hood have caused the fan to stop and log the fault code.
Repair: Determine the cause of the high temperatures under the hood. Inspect for airflow blockage, or operation in hot ambient temperatures.
Result: The fan is NOT operational with the 4-pin connector disconnected.
Proceed to Test Step 3.
3. Check for Voltage at the Fan
A. Disconnect the two-pin connector to the fan.
B. Measure the voltage between pins 1 and 2 on the connector.
Battery Voltage
Result: The voltage is OK.
Proceed to Test Step 4.
Result: The voltage is NOT OK.
Repair: The problem is in the wiring between the fan and the battery. Check the fuse between the fan and the battery. Repair the wiring.
If the problem is not resolved, proceed to Test Step 4.
4. Check for Continuity Between the Fan and the ECM
A. Turn the keyswitch to OFF.
B. Disconnect the four-pin connector on the aftertreatment cooling fan.
C. Disconnect both the J1 and the J2 harness connectors from the engine ECM.
D. Check for continuity between the following pins:
• Pin 1 on the 4-pin aftertreatment cooling fan connector and pin 20 on the J1 ECM connector.
• Pin 3 on the 4-pin aftertreatment cooling fan connector and pin 12 on the J2 ECM connector.
• Pin 4 on the 4-pin aftertreatment cooling fan connector and pin 11 on the J2 ECM connector.
Continuity
Result: There are less than 10 ohms of resistance on each wire.
Repair: Replace the aftertreatment cooling fan. Verify that the problem is resolved.
Result: There are more than 10 ohms of resistance on each wire.
Repair: Repair the wiring or replace the wiring. Verify that the problem is resolved.