Page 670 of 1395

Symptom-to-Component Chart
Hydraulic System (cont'd)
SYMPTOMCheck these items on thePROBABLE CAUSE ListCheck these items onthe NOTES Lisr
Shift lever does not operate smoothly.o, JdPFails to shift; stuck in 4th gear.14, 41 , 48
Transmission will not shift into park in E position.6, 38, 61PStall rpm high; all clutch pressures are in specification.40D,K,OLock-up clutch does not disengage.18, 43, 44, 45, 46, 49,50,57
Lock-up clutch does not operate smoothly.14, 40, 43, 44, 45, 46, 49, 50. 57Lock-up clutch does not engage.'t8, 40, 43, 44, 45, 46, 49, 50, 56, 57Vibration in all positions.
No engine braking in I position.59
Shift position indicator does not indicate anv position,6. 38, 60
PROBABLE CAUSE
I 33 Thrust washer worn/damaged
ATF pump worn or binding34Clutch clearance incorrect
Regulator valve stuck or regulator valvespflng wornDrive plate delective or transmission mtsas-sembled
Servo valve stuck5ttTorque converter housing or transmissionhousing bearing worn/damagedMainshaft worn/damaged
Shift cable broken/out of adjustmentATF strainer clogged
7Final gears worn/damaged38Shift cable is worn where it attaches to thetransmission or at the body mountsIOne-way (sprag) clutch worn/damaged
1st gears worn/damaged {2 gears)39Modulator valve stuck10lst clutch defective40Torque converter check valve stuck112nd gears worn/damaged (2 gears)41Foreign material in separator plate't22nd clutch defectiveCPB valve stuck
t53rd clutch defective43Lock-up timing valve stuck144th clutch defective44Lock-up shift valve stucktcReverse gears worn/damaged (3 gears)Lock-up control valve stuck16Excessive ATF46Lock-up clutch Diston defective17Torque converter one-way clutch defective47Shift control solenoid valve A defecttve
18Linear solenoid assemblv defective (,98 - OOmodels)48Shift control solenoid valve B dsfectrve
49Lock-up control solenoid valve A defective'19CPC valve stuckLock-up control solenoid valve B deleqtve20l-2 shift valve stuck51Servo control valve stuck212-3 shift valve stuck52lst accumulator defective3-4 shift valve stuck53Foreign material in 2nd exhaust orifice2nd accumulator defective54Foreign material in 3rd exhaust orifice3rd accumulator defectiveForeign material in 4th exhaust orifice4th accumulator defective56Mainshaft speed sensor defective262nd orifice control valve stuckCountershaft speed sensor defective273-4 orifice control valve stuck583rd sub accumulator defective2aForeign material in main orifice59lst-hold clutch defective29Foreign material in lst orifice60A/T gear position switch defective or out ofadjustment30Foreign material in reverse orifice
31Engine output low61Park gear mechanism defective32Needle bearing worn/damaged
14-154
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Page 729 of 1395
Glutch
lllustrated lndex
3RD CLUTCH
lST CLUTCH
SNAP RING
CLUTCH PISTON
RETURN SPRING
NETAINER
RING
CLUTCH PLATESStandard thicknoss:2.00 mm 10.079 inl
CLUTCH DISCSStandard thickne$:1.94 mm (0 0?6 inl
CLUTCH DISCSStandard thicknca3:1.9a mm 10.076 inl
SNAP FING
CLUTCH DRUM
(cont'd)
CHECK VALVE
14-213
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Page 730 of 1395
Clutch
lllustrated Index (cont'dl
2ND/4TH CLUTCH
[*
CLUTCH PLATESStendard thickness:2.00 mm {0.079 in)
CLUTCH
OISC SPRING
I
I2ND CLUTCH
CLUTCH PISTON
sPl
I
Repl6ce.
uoavE nr"
CLUTCH PLATESStandard thicknesai2.00 mm {0.079 inl
SNAP RING
14-214
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Page 732 of 1395
Clutch
Disassembly
l. Remove the snap ring, then remove the clutch endplate, clutch discs and plates.
SCREWORIVER
SNAP RING
2. Remove the disc spring.
1ST, 2ND, 4TH lST-HOLD CLUTCH:
CLUTCH DBUM
3RD CLUTCH:
-'=*.=:--
'..p
Remove the disc spring.
DISC SPRING
DISC SPRING
14-216
3. Install the special tools as shown.
CLUTCHCOMPRESSORAOLT ASSEMBLY07GAE - FGao2OO orOTGAE . PG4O2OA
CLUTCH SPNINGCOMPRESSORATTACHMENT07LAE - PX40100
CLUTCH SPRINGCOMPRESSORATTACHMENT07LAE - PX4010O or07HAE - PL50100
CLUTCH SPRINGCOMPRESSORATTACHMENT07LAE - PX40t00
CLUTCH SPRINGCOMPRESSORATTACHMENT07LAE - PX4010O or07HAE - PL50100
CLUTCH SPRINGCOMPRESSORBOLT ASSEMBLY07GAE - PG0200 orOTGAE - PG4O2OA
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Page 736 of 1395
Clutch
Installthe snap ring.
Reassembly (cont'd)
7.
S AP RIIG
8. Remove the special tools.
9, Install the disc spring in the direction shown.
1ST, 2ND, 4TH, lST-HOLD CLUTCH:
3RD CLUTCH:
Dlsc sPRrrtc
CIUTCH ORUM
otsc sPfitl{c
14-220
10.Soak the clutch discs thoroughly in ATF for a mini_mum of 30 minutes. Before installing the platesand discs, make sure the inside of the clutch drumis free of din or other foreign matter
Starting with a clutch plate, alternatelv install theclutch plates and discs. Install the clutch end platewith its flat side toward the disc.
CLUTCH EI{D PI.ATEInstall in this directior.
CLUTCHCLUTCH EI{D PLATE
12. Install the snap ring.
SCREWDRIVER
't1.
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Page 737 of 1395

13. Measure the clearance between the clutch end plate
and top disc with a dial indicator. Zero the dial indi-
cator with the clutch end plate lowered, and lift it up
to the snap ring. The distance that the clutch end
plate moves is the clearance between it and the top
dtsc.
NOTE: Take measurements in at least three places'
and use the average as the actual clearance.
Clutch End Ptate-to-Top Disc Clearance:
ClutchService Limit
'l st
2nd
3rd
4th
lst-hold
0.65 - 0.85 mm (0.026 - 0.033 in)
0.40 - 0.60 mm (0.016 - 0.024 in)
0.40 - 0.60 mm (0.016 - 0.024 in)
0.40 - 0.60 mm (0.016 - 0.024 in)
0.50 - 0.80 mm (0.020 - 0.031 in)
SNAP RING
lf the clearance is not within the service limits, select
a new clutch end plate from the following table
NOTE: lf the thickest clutch end plate is installed,
but the clearance is still over the standard, replace
the clutch discs and clutch plates.
MARK
I I rnictness
--:--l----T
14.
CLUTCH END PLATE
14-221
lST CLUTCH END PLATES
2ND and 4TH CLUTCH END PLATES
3RD CLUTCH END PLATES
lST-HOLD CLUTCH END PLATES
MarkThicknass'I22551 P56 - N002.1 mm (0.083 in)
222552-P56-N002.2 mm (0.087 in)
322553 - P56 N002 3 mm (0.091 in)
22554-P56-NOo2.4 mm (0.094 in)
522555 P56 - N002.5 mm {0.098 in)
622556 P56 - N002 6 mm (0.102 in)
722557 - P56 N002.7 mm (0.106 in)
822558 - P56 N002.8 mm (0.110 in)
I22559 - P56 N002.9 rnm (0.114 in)
1022s60 - P56 N003.0 mm (0.118 in)
MarkParl NumberThickness
622556-P56-N002.6 mm (0.102 in)
122557 P56 - N002.7 mm (0.106 in)
822558-P56-N002.8 mm (0.110 in)
22559-P56-N002.9 mm (0.114 in)
1022560 - P56 N003.0 mm (0.118 in)'1122561 PDM - 0003.1 mm (0.122 inl
1222562 - PDM - 0003.2 mm {0.126 in)
1322563 PDM - 0003.3 mm (0.130 in)
22564 PDM - 0003.4 mm (0.134 in)
22565 PDM - 0003.5 mm (0.138 in)
22566 PDM - 0003.6 mm 10.142 in)
1722567-PDM-0003.7 mm (0.146 in)
MarkPart NumberThiclness
I22558 P56 - N002.8 mm (0.110 inl
922559 P56 - N002.9 mm (0.114 in)
1022560 P56 - N003.0 mm (0.118 in)
1122561 PD[4 - 0003.1 mm (0.122 in)
1222562 - PDM 0003.2 mm (0.126 in)
t322563-PDM-0003.3 mm (0.130 in)'1422564-PDN4-0003.4 mm (0.134 in)
1522565-PD[,l-0003.5 mm (0.138 in)
22566 PDM - 0003.6 mm (0.142 in)'t122567 - PoM - 0003.7 mm {0.146 in)
Thickness
2255r-PS5-0032.1 mm (0.083 in)
22552 - PS5- 0032.2 mm {0.087 in)
322553 PS5 - 0032.3 mm (0.091 in)
22554, PS5 - 0032.4 mm (0.094 in)
22555 PS5 - 0032.5 mm (0.098 in)
622556 PS5 - 0032.6 mm {0.102 in)
722557 - PSs 0032.7 mm (0.106 in)
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Page 794 of 1395

Description
Rear Differential
Outline
The Real-time 4WD-Dual Pump System model has a hydraulic clutch and a differential mechanism in the rear differential
assembly. Under normal conditions, the vehicle is driven by the front wheels. However, depending on to the driving force
of the front wheels and the road conditions. the system instantly transmits appropriate driving force to the rear wheels
without requiring the driver to switch between 2WD (tront wheel drive) and 4WD (four wheel drive). The switching mecha-
nism between 2WD and 4WD is integrated into the rear differential assembly to make the system light and compact.
ln addition, the dual-pump system switches off the rear-wheel-drive force when braking in a forward gear. This allows the
braking system to work properly on models equipped with an Anti-lock Braking System (ABS).
Construction
The rear differential assembly consists of the torque control differential case assembly and the rear differential carrier
assembly. The torque control differential case assembly consists of the differential clutch assembly, the companion
flange, and the oil pump body assembly. The rear differential carrier assembly consists of the differential mechanism. The
differential drive and driven gears are hypoid gears.
The oil pump body assembly consists of the front oil pump, the rear oil pump, the hydraulic control mechanism, and the
clutch piston. The clutch piston has a disc spring that constantly provides the differential clutch assembly with a preset
torque to Drevent abnormal sound.
The clutch guide in the differential clutch assembly is connected to the propeller shaft via the companion flange, and it
receives the driving force lrom the transfer assembly. The clutch guide rotates the clutch plate and the front oil pump in
the oil pump body.
The clutch hub in the differential clutch assembly has a clutch disc that is splined with the hypoid drive pinion gear. The
hypoid drive gear drives the rear oil pump.
The front and rear oil pumps are trochoidal pumps. The rear oil pump capacity is 2.5 percent larger that the front oil pump
to handle the rotation difference between the front and rear wheels caused by worn front tires and tight corner braking.
The oil pumps are designed so the fluid intake works as a fluid discharge when the oil pumps rotate in reverse. Genuine
Honda CVT fluid is used instead of differential fluid.
Operation
When there is a difference in rotation speed between the front wheels (clutch guide) and rear wheels (hypoid driven gear),
hydraulic pressure from the front and rear oil pumps engages the differential clutch, and drive force from the transler
assembly is applied to the rear wheels.
The hydraulic pressure control mechanism in the oil pump body selects 4WD mode when the vehicle is started abruptly,
or when accelerating in a forward or reverse gear (causing rotation difference between the front and rear wheels). or
when braking in reverse gear {when decelerating). lt switches to 2WD mode when the vehicle is driven at a constant speed
in forwar! or reverse gear (when there is no rotation difference between the front and rear wheels), or when braking in a
fo rwa rd gear (when decelerating).
To protect the system, the differential clutch assembly is lubricated by hydraulic pressure generated by the oil pumps in
both 4WD and 2WD modes. Also, the thermal switch relieves the hydraulic pressure on the clutch piston and cancels 4WD
mode if the temDerature of the differential fluid rises above normal.
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Page 795 of 1395
TOROUE CONTROL OIFFERENTIAL
REAR DIFFERENTIAL ASSEMBLY
OIL PUMP BODY
OIFFERENTIAL CLUTCHHYPOID DRIVEPINION GEAR
OIFFERENTIAL CARRIER
DIFFERENTIAL
HYPOID RING GEAR
DIFFERENTIAI- HOUSING
REAR OII- PUMP
ASSEMBLY
CLUTCH GUIDE
COMPANION FLANG€
CLUTCH HUB
CLUTCH PLATE
HYDRAULIC CONTROL SYSTEM
CLUTCH PISTON
CLUTCH DISC
REAR OIL PUMP
FRONT OIL PUMP
DISC SPRINGFRONT OIL PUMP
DIFFEREMT|AL CLUTCHASSEMBI-Y
THERMAL SWITCHRELIEF VALVEOIL STRAINER
15-5
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