The purpose of Radiator Shutter Enable (RSE) circuit is to provide control to open or close the radiator shutters (energize or de-energize a solenoid). The purpose of this device is to keep the engine warm during cold weather operation. When the ignition switch is in the ON position, power is available to the shutter solenoid. The solenoid is energized and the shutters are closed when the engine coolant temperature is below 181.5°F, 83°C, and de-energized (allowing the shutters to open) when cooling temperature gets above 185°F, 85°C. The ECM controls the shutter solenoid by providing a path to ground for the solenoid coil.see Figure
“Radiator Shutter Enable”
.
Note: This circuit has many applications and can be wired in many configurations. The applicable wiring diagram for the correct application must be used for troubleshooting this circuit.
Figure 1. Radiator Shutter Enable
Section 39.1.1
Fault Detection / Management
An open or short to ground can be detected in the RSE circuit during an On Demand Engine Standard Test performed by the technician.
.
Figure 2. Radiator Shutter
RSE connector voltage checks are listed in Table
“Voltage Checks at Radiator Shutter Enable Connector”
. Checks are made with the RSE solenoid disconnected and the ignition key ON, Engine OFF.
| +Test Points- | Spec | Comments |
| A to Grd | 12 ± 1.5v | Power should be available with key ON check fuse and/or circuit or open/shorts. |
| B to Grd | 0-1v | If voltage present, check for short to power. |
RSE solenoid continuity checks are listed in Table
“Radiator Shutter Enable Solenoid Continuity Checks”
. Checks are made with the RSE solenoid disconnected; resistance is measured through the solenoid.
| +Test Points- | Spec | Comments |
| (B) to Grd | > 100 Ω | If less than 100 Ω, check for short to ground. |
| (A) to Grd | > 100 Ω | If less than 100 Ω, check for short to ground. |
| (B) to (A) | 10 to 30 Ω | Expected coil resistance of solenoid. |
Harness resistance checks are listed in Table
“Harness Resistance Check”
. Checks are made with the RSE solenoid disconnected; battery positive cable disconnected; and breakout box installed.
| +Test Points- | Spec | Comments |
| 9 to B | < 5 Ω | If greater than 5 Ω, check for open circuit. |
| F4 to A | < 5 Ω | If greater than 5 Ω, check for open circuit. |
| 9 to Grd | > 100 Ω | If less than 100 Ω, check for short to ground. |
| B to Grd | > 100 Ω | If less than 100 Ω, check for short to ground. |
Operational checks are listed in Table
“Operational Checks”
. Checks are made with the RSE solenoid connected and breakout box installed.
Note: Perform this test only where there are no ECT faults present. Monitor the ECT temperature and voltage at the ECM engine pin No. 9 while the engine or vehicle is in operation.
| +Test Points- | Spec | Comments |
| 9 to 19 | 0 volts | Solenoid energized; shutters closed; ECT temperature less than 181.5°F, 83°C. |
| 9 to 19 | 12 volts | Solenoid de-energized; shutters open; ECT temperature more than 185°F, 85°C. |
Fault Code Description:
Flash Code 256 = The RSE control solenoid failed the output circuit check during a Key ON, Engine OFF Standard Test.
Section 39.1.2
Function
The purpose of the RSE feature is to provide the proper logic to open or close the radiator shutters (energize or de-energize a solenoid). Closing the shutters will keep the engine warm during cold weather operation. This will provide faster warm-up of the passenger cab, thereby enabling faster defrost of the windshield.
Section 39.1.3
Radiator Shutter
This parameter indicates to the on-board electronics if the vehicle has the electronically controlled radiator shutter.
OFF: Feature is turned off at all times.
ON: Feature is enabled and the radiator shutter is electronically controlled.
185°F, 85°C — Open; de-energize solenoid.
181.5°F, 83°C — Close; energized.
Section 39.1.4
Flash Code 256
ATA Code SID 55 FMI 11
Radiator Shutter Enable OCC fault.
The Output Circuit Test, performed during an On Demand Engine Standard Test, will test the RSE solenoid circuit for an open or short condition. If an out of range condition exists, a Flash Code 256 will be set.
| Series 40E Troubleshooting Manual – 6SE241 |
| Generated on 10-13-2008 |