Fig. 4: Connecting Backprobe Adapters To Stacking Patch Cords
Courtesy of AMERICAN HONDA MOTOR CO., INC.
PRECAUTIONS FOR REAL-TIME AWD (ALL-WHEEL DRIVE)
Under normal conditions, the AWD vehicle is in 2WD (front-wheel drive). However, the system will instantly
transmit appropriate driving force to the rear wheels (depending on the driving force of the front wheels and the
road conditions).
The Real-time AWD System does not have a manual switch to disable the AWD system. Whenever service
work requires spinning the front or rear wheels with the engine, always lift and support the vehicle so all four
wheels are off the ground.
REAL TIME AWD SYSTEM SYMPTOM TROUBLESHOOTING INDEX
Symptom
Probable Cause
Remedy
ο¬
ο¬
Add recommended fluid
ο¬
ο¬
Fluid level too low
Incorrect fluid type
Rear differential overheats
Drain and fill the differential with the
recommended fluid
ο¬
ο¬
ο¬
ο¬
ο¬
Fluid level too high
ο¬
ο¬
ο¬
ο¬
ο¬
Lower to proper level
Clean or replace
Clogged breather hose
Worn or damaged oil seal
Damaged sealing washer
Rear differential leaks
fluid
Replace the oil seal
Replace the sealing washer
Recheck torque or apply sealant
Loose mounting bolts or
inadequate sealing
HDS does not
communicate with vehicle
TROUBLESHOOTING THE DLC
CIRCUIT
HDS does not
communicate with real
time AWD control unit
Do the symptom troubleshooting for HDS
does not communicate
AWD system indicator
does not come on
Do the symptom troubleshooting for AWD
system indicator does not come on
AWD system indicator
does not go off, and no
DTCs are stored
Do the symptom troubleshooting for AWD
system indicator does not go off, and no
DTCs are stored
Will not go into 4WD
mode, Poor traction, Poor
acceleration (at start),
Poor climbing ability
Do the symptom troubleshooting for Will
not go into 4WD mode, Poor traction,
Poor acceleration (at start), Poor
climbing ability
Do the symptom troubleshooting for Real
Time AWD System is stuck in 4WD
mode
Real Time AWD System
is stuck in 4WD mode
ο¬
Gear noise
ο‘
Poor meshing
hypoid gear (ring
gear and drive
pinion)
ο‘
ο‘
ο‘
Hypoid gear (wear
or damage)
Poor pre-road (drive
pinion)
Dust got into hypoid
gear area
ο‘
ο‘
Fluid level too low
Distortion of the
differential carrier
case
Abnormal noise
ο¬
Bearing noise
ο‘
ο‘
ο‘
Bearing (wear or
damage)
Drive pinion taper
bearing (wear)
Dust got into bearing
ο¬
Pump noise (at lubrication)
ο‘
Dust got into pump
ο‘
Rotor (wear or
damage)
ο¬
ο¬
Torque shortage
Gear noise
ο‘
Poor meshing
hypoid gear (ring
gear and drive
pinion)
ο‘
ο‘
ο‘
Hypoid gear (wear
or damage)
Poor pre-road (drive
pinion)
Dust got into hypoid
gear area
ο‘
ο‘
Fluid level too low
Distortion of the
differential carrier
case
ο‘
ο‘
ο‘
Excessive backlash
(hypoid gear)
Excessive backlash
(differential gear)
Differential side gear
spline (wear)
ο¬
Bearing noise
ο‘
ο‘
ο‘
Bearing (wear or
damage)
Drive pinion taper
bearing (wear)
Abnormal noise (at start)
Dust got into bearing
ο¬
ο¬
Pump noise (at lubrication)
ο‘
Dust got into pump
ο‘
Rotor (wear or
damage)
Rear differential pump
motor noise
ο‘
Bearing (wear or
damage)
ο‘
Dust got into rear
differential pump
motor
ο¬
ο¬
Pump noise (at control)
ο‘
Dust got into pump
ο‘
Rotor (wear or
damage)
Rear differential solenoid
valve noise
ο‘
Dust got into rear
differential solenoid
valve
ο‘
ο‘
Plunger area or shaft
area (wear)
Rear differential
solenoid valve (wear
or damage)
ο¬
Clutch chatter
ο‘
Fluid deterioration
ο‘
Clutch facing (burnt
or deterioration)
ο‘
Clutch plate
(deterioration)
ο¬
ο¬
Torque shortage
Gear noise
ο‘
Poor meshing
hypoid gear (ring
gear and drive
pinion)
ο‘
ο‘
ο‘
Hypoid gear (wear
or damage)
Poor pre-road (drive
pinion)
Dust got into hypoid
gear area
ο‘
ο‘
Fluid level too low
Distortion of the
differential carrier
case
ο‘
ο‘
ο‘
Excessive backlash
(hypoid gear)
Excessive backlash
(differential gear)
Differential side gear
spline (wear)
ο¬
Bearing noise
ο‘
ο‘
ο‘
Bearing (wear or
damage)
Drive pinion taper
bearing (wear)
Dust got into bearing
ο¬
Pump noise (at lubrication)
accelerate)
ο‘
ο‘
Dust got into pump
Rotor (wear or
damage)
ο¬
Rear differential pump
motor noise
ο‘
Bearing (wear or
damage)
ο‘
Dust got into rear
differential pump
motor
ο¬
ο¬
Pump noise (at control)
ο‘
Dust got into pump
ο‘
Rotor (wear or
damage)
Rear differential solenoid
valve noise
ο‘
Dust got into rear
differential solenoid
valve
ο‘
ο‘
Plunger area or shaft
area (wear)
Rear differential
solenoid valve (wear
or damage)
ο¬
Clutch chatter
ο‘
Fluid deterioration
ο‘
Clutch facing (burnt
or deterioration)
ο‘
Clutch plate
(deterioration)
ο¬
ο¬
Torque shortage
Gear noise
ο‘
Poor meshing
hypoid gear (ring
gear and drive
pinion)
ο‘
ο‘
ο‘
Hypoid gear (wear
or damage)
Poor pre-road (drive
pinion)
Dust got into hypoid
gear area
ο‘
ο‘
Fluid level too low
Distortion of the
differential carrier
case
ο¬
Bearing noise
ο‘
ο‘
ο‘
Bearing (wear or
damage)
Drive pinion taper
bearing (wear)
Dust got into bearing
ο¬
Differential gear noise
ο‘
Side gear and pinion
gear (wear or
damage)
Abnormal noise (at
turning)
ο‘
ο‘
Pinion shaft
(damage)
Dust got into
differential gear area
ο¬
Clutch chatter
ο‘
Fluid deterioration
Do the symptom troubleshooting for
Abnormal noise
ο‘
Clutch facing (burnt
or deterioration)
ο‘
Clutch plate
(deterioration)
ο¬
ο¬
Torque shortage
Gear noise
ο‘
Poor meshing
hypoid gear (ring
gear and drive
pinion)
ο‘
ο‘
ο‘
Hypoid gear (wear
or damage)
Poor pre-road (drive
pinion)
Dust got into hypoid
gear area
ο‘
ο‘
Fluid level too low
Distortion of the
differential carrier
case
ο‘
Excessive backlash
(hypoid gear)
ο‘
ο‘
Excessive backlash
(differential gear)
Differential side gear
spline (wear)
ο¬
Bearing noise
ο‘
ο‘
ο‘
Bearing (wear or
damage)
Drive pinion taper
bearing (wear)
Dust got into bearing
ο¬
Differential gear noise
ο‘
Side gear and pinion
gear (wear or
damage)
ο‘
ο‘
Pinion shaft
(damage)
Dust got into
differential gear area
ο¬
ο¬
Pump noise (at lubrication)
Abnormal noise (at
turning and accelerate)
ο‘
Dust got into pump
ο‘
Rotor (wear or
damage)
Rear differential pump
motor noise
ο‘
Bearing (wear or
damage)
ο‘
Dust got into rear
differential pump
motor
ο¬
ο¬
Pump noise (at control)
ο‘
Dust got into pump
ο‘
Rotor (wear or
damage)
Rear differential solenoid
valve noise
ο‘
Dust got into rear
differential solenoid
valve
ο‘
Plunger area or shaft
area (wear)
ο‘
Rear differential
solenoid valve (wear
or damage)
ο¬
Clutch chatter
ο‘
Fluid deterioration
ο‘
Clutch facing (burnt
or deterioration)
ο‘
Clutch plate
(deterioration)
ο¬
Torque shortage
REAL TIME AWD CONTROL UNIT CONNECTOR FOR INPUTS AND
OUTPUTS
REAL TIME AWD CONTROL UNIT INPUTS AND OUTPUTS FOR 24P CONNECTOR
(CONNECTOR DISCONNECTED)
Fig. 5: Identifying Real Time AWD Control Unit Inputs And Outputs For 24P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Terminal Wire Terminal
Description
Signal
number
color
sign
Power supply for pump
motor
With pump motor off: about 0 V
With pump motor on: battery voltage
1
RED MH
2
3
4
WHT PWR
BLK ML
BLK PG
Power supply for actuator
Ground for the pump motor With ignition switch ON (II): about 0 V
Ground for the actuator
With engine running: battery voltage
With ignition switch ON (II): about 0 V
Ground for the differential
assembly
5
BLK DG
With ignition switch ON (II): about 0 V
Ground for the real time
AWD relay
---------
Ground for the real time
AWD control unit
With ignition switch ON (II): about 0 V
to battery voltage
6
7
8
9
PUR FSR
Not used Not used
BLK LG
---------
With ignition switch ON (II): about 0 V
Not used Not used
2024 Honda CR-V Owner's Manual
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