Dodge Ram Truck 1500-2500-3500. Manual — part 2020
MODE 2 CALIBRATION FAULT (CONTINUED)
6.
CHECK FOR A BROKEN MODE DOOR ACTUATOR 2
Remove the Mode Door Actuator 2 from the A/C Heater Housing Assembly.
Disconnect the Mode Door Actuator 2 harness connector.
By hand, attempt to rotate the actuator in both directions.
Does the actuator turn in either direction?
Yes
>> Replace the Mode Door Actuator 2 in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
No
>> Go To 7
7.
CHECK FOR MISSING & BROKEN ACTUATOR LINKAGE & THE DOOR FOR BINDING & A LOSS OF
RANGE
Inspect the A/C Heater Housing Assembly for missing and broken actuator linkage.
Inspect the linkage and the actuator for broken and missing teeth.
Check the door for binding and a loss of full range.
Are there any physical or mechanical problems with the door, actuator, linkage, or housing?
Yes
>> Repair as necessary in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
No
>> Replace the A/C Heater Control in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
24 - 80
HVAC - ELECTRICAL DIAGNOSTICS
DR/DH
MODE 2 CIRCUIT SHORTED TO GROUND
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
When the Actuator Circuit Test is executed.
•
Set Condition:
If the A/C Heater Control detects a short to ground on the (C29) Mode Door 2 Driver circuit.
Possible Causes
DOOR DRIVER CIRCUIT(S) SHORTED TO GROUND
DOOR DRIVER CIRCUITS SHORTED TOGETHER
DOOR ACTUATOR(S)
A/C HEATER CONTROL
For Single-Zone HVAC systems, refer to *ACTUATOR CIRCUIT TEST DIAGNOSTICS (SINGLE-ZONE) in this
Section for the diagnostic test procedure. For Dual-Zone HVAC systems, refer to *ACTUATOR CIRCUIT TEST
DIAGNOSTICS (DUAL-ZONE) in this Section for the diagnostic test procedure.
DR/DH
HVAC - ELECTRICAL DIAGNOSTICS
24 - 81
MODE 2 CIRCUIT SHORTED TO IGN OR BATT
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
When the Actuator Circuit Test is executed.
•
Set Condition:
If the A/C Heater Control detects a short to voltage on the (C29) Mode Door 2 Driver circuit.
Possible Causes
DOOR DRIVER CIRCUIT(S) SHORTED TO VOLTAGE
DOOR DRIVER CIRCUITS SHORTED TOGETHER
DOOR ACTUATOR(S)
A/C HEATER CONTROL
For Single-Zone HVAC systems, refer to *ACTUATOR CIRCUIT TEST DIAGNOSTICS (SINGLE-ZONE) in this
Section for the diagnostic test procedure. For Dual-Zone HVAC systems, refer to *ACTUATOR CIRCUIT TEST
DIAGNOSTICS (DUAL-ZONE) in this Section for the diagnostic test procedure.
24 - 82
HVAC - ELECTRICAL DIAGNOSTICS
DR/DH
MODE 2 OVERCURRENT (DUAL-ZONE)
DR/DH
HVAC - ELECTRICAL DIAGNOSTICS
24 - 83
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