MBE 900 4000 Troubleshooting – Section 22.2 Troubleshooting SID 59

Section 22.2
Troubleshooting SID 59

The following procedures will troubleshoot SID 59.‪

Section 22.2.1
059 05 – Fan Open Circuit

Perform the following steps to troubleshoot a fan open circuit fault:‪

1. Bridge pins 1 and 3 on the fan electrical connector. See Figure "Pin Locations on Fan Electrical Connector" .
   

   1. Pin 1‪	3. Pin 3‪
   2. Pin 2‪	4. Fan Connector‪

   Figure 1. Pin Locations on Fan Electrical Connector

   1. If new fault code 059 06 is active, repair or replace the fan control clutch. Erase fault code memory.
   2. If new fault code 059 06 is not active, go to step 2 .
2. Measure the resistance between wires 41 and 12 on the 55-pin wiring harness connector. See Figure "Location of Fan Control Wires" .
   

   Figure 2. Location of Fan Control Wires

   1. If resistance is less than 3 Ω, contact Detroit Diesel Technical Service.
   2. If resistance is greater than 3 Ω, repair open circuit or bad contact in wire 41 or 12. Erase fault code memory.

Section 22.2.2
059 06 – Fan Short to Ground

Perform the following steps to troubleshoot a fan short-to-ground fault:‪

1. Unplug the fan.
   1. If new fault code 059 05 is active, repair or replace the fan control clutch. Erase fault code memory.
   2. If new fault code 059 05 is not active, go to step 2 .
2. Measure the resistance between wires 41 and 12 on the fan electrical connector. See Figure "Location of Fan Control Wires" .
   1. If resistance is less than 3 Ω, repair short circuit between wires 41 and 12. Erase fault code memory.
   2. If resistance is greater than 3 Ω, go to step 3 .
3. Measure the resistance between wires 43 and 12 on the fan electrical connector. See Figure "Location of Fan Control Wires" .
   1. If resistance is less than 3 Ω, repair short circuit between wires 43 and 12. Erase fault code memory.
   2. If resistance is greater than 3 Ω, go to step 4 .
4. Measure the resistance between wire 41 on the fan electrical connector and vehicle ground. See Figure "Location of Fan Control Wires" .
   1. If resistance is less than 30 kΩ, repair short to ground in wire 41. Erase fault code memory.
   2. If resistance is greater than 30 kΩ, go to step 5 .
5. Measure the resistance between wire 43 on the fan electrical connector and vehicle ground. See Figure "Location of Fan Control Wires" .
   1. If resistance is less than 30 kΩ, repair short to ground in wire 43. Erase fault code memory.
   2. If resistance is greater than 30 kΩ, contact Detroit Diesel Technical Service.