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10.24
ELECTRICAL
ACTIVE DESCENT CONTROL (ADC)
COIL
Operation Overview
• AWD switch must be ‘ON’.
• PDM pin ‘M’ on SSCB #1 controls the power to the
ADC hub coil for operation.
• PDM pin ‘C’ on SSCB #1 senses the gear signal
indicating the transmission is engaged and is not in Park
or Neutral.
• PDM pin ‘K’ on SSCB #2 senses the speed sensor
signal for determining if vehicle speed is below 15
Mph.
• ECU pin #21 sends a signal to PDM pin ‘D’ on SSCB
#1 to determine the TPS position and will cancel ADC
operation if TPS moves off ‘idle’ position.
• System must be grounded to operate.
Diagnosing System Failures
• Verify the AWD switch is functional.
• Verify the ADC hub coil is functional. Test the ADC
hub coil using an ohm meter.
• Verify the TPS is functioning correctly. Test using
Digital Wrench Diagnostic Software. (Dealer Only)
• Verify the wiring harness, wiring, connectors,
connector pins, grounds and PDM / ECU pin locations
are undamaged, clean and connect properly.
• Verify continuity of wire connections with a known
good volt/ohm meter.
IMPORTANT: Verify all wires and wiring connections
have been tested properly with a known good volt/
ohm meter before suspecting a component failure.
80% of all electrical issues are caused by bad/failed
connections and grounds.
NOTE: Refer to the ADC subsystem diagram located
in ‘Wire Diagrams’ at the end of this chapter.
ALL WHEEL DRIVE (AWD) COIL
Operation Overview
• AWD switch must be ‘ON’. 12Vdc power is present at
the ADC hub coil.
• The instrument cluster senses grounding at pin #16.
AWD icon should turn on at the instrument cluster.
• System must be grounded to operate.
Diagnosing System Failures
• Verify the AWD switch is functional.
• Verify the AWD hub coil is functional. Test the AWD
hub coil using an ohm meter.
• Verify the wiring harness, wiring, connectors,
connector pins and grounds are undamaged, clean and
connect properly.
• Verify continuity of wire connections with a known
good volt/ohm meter.
IMPORTANT: Verify all wires and wiring connections
have been tested properly with a known good volt/
ohm meter before suspecting a component failure.
80% of all electrical issues are caused by bad/failed
connections and grounds.
ADC Hub Coil Resistance:
12 ± 5%
AWD Hub Coil Resistance:
24 ± 5%