1998 HONDA CIVIC circuit

Description
Hydraulic Flow (cont'dl
E position
Reverse Inhibitor Conirol
lf the E position is selected while the veiicle is moving forward at speeds over 6 mph (10 km/h), the inhibitor solenoiddoesn't turn off by means of the TcM or PCM Reverse inhibitor pressure (Rl) is not applied to the reverse inhibitor valveas the reverse inhibitor solenoid turns on. The reverse inhibitor valve is kept on the right side, and covers the pon ro sropreverse brake pressure {RVS} to the reverse brake from the manual valve. Reverse brike pressure (RVs) i; not appried tothe reverse brake, and power is not transmitted to the reverse direction.
NOTE: When used, "left,' or,,right,, indicates direction on the hydraulic circuit.
14-218

Description
Hydraulic Flow (cont'd)
lll position, when th€ electronic control system is fauhy.
when the electronic control svstem (linear solenoids and sensors) is faulty, the transmission uses the pitot pipe pressure(PP) to 311o- rh" u"hicle to drive.
when all linear solenoids and sensors are off because of a faulty electronrc control system, clutch reducing pressure (cR)flows to the start clutch control valve, the manual valve, the PH-PL control valve, and the shift control valve. clutch reduc-ing pressure (cR) becomes shift varve pressure (sV) at the shift contror varve, and shift varve pressure {sv) is appried tothe left end of the shift valve and the right end of the shift inhibitor valve. The shift valve moves to the right side. anduncovers the pon that leads high pressure (PH) to the drive pulley and uncovers the po.t tlr"t r""1" ro,,"-pressure (pL) tothe driven pulley At this time, the pulley ratio is high, The shift inhibitor valve moves to the left side, and uncovers theport that leads shift inhibitor pressure (Sll to the pitot lubrication pipe and the pitot regulator valve. tne prtot lubricationpipe discharges fluid inside of the pitot flange, and discharged fluid enters into the pitot pipe and it is applied to the leftend of the pitot regulator valve. The pitot regulator valve moves lo the right side, and uncovers the port that leads pitotregulator pressure (PR) to the shift inhibitor valve. Pitot regulator pressure {pR) becomes start clutch pressure {sc1 at theshift inhibitor valve, and is applied to the stan clutch. The stan clutch rs engaged. The forward clutch pressure (FWD) isapplied to the forward crutch, and the forward crutch is engaged. This alows the vehicre to drive.
NOTE: When used. "|eft" or ,,right', indicates direction on the hydraulic circuit.
14-220
I.

E] position, when the elestronic Gontrol system is faulty'
The flow of tluid up to the drive pulley, the driven pulley' and the start clutch is the same as in El position
The manual valve is shifted into the lE position' and it uncovers the port that leads reverse brake pressure {RVS} to the
reverse inhibitor valve. Reverse ,"nlu-i,"ip*r""i" (Rl) is applied to.the right end of the reverse inhibitor valve because of
afaultyinhibitorsolenoid.The'"t'",""inftiUito'valvemovestotheleftside'anduncoverstheportthatleadsreverse
brake pressure {RVS) to the ,"u"r." ir"t"- cru,ch reducing pressure (cR) becomes reverse brake pressure (RVS) at the
manual valve, and,lows to the ,e
"rs" lr"re. ttre reverse brake is engaged and locks the ring gear' This allows the vehi-
cle to drive in reverse.
NOTE: When used, "left" or "right" indicates direction on the hydraulic circuit'
14-221

TCM Circuit Diagram ('96 - 98 Modelsl
UNDEN. HOOD FUSE]RELAY BOX
UNDER OASHFUSE/RELAY 80X
No. 52 1l5A)
No.4l l80A) No.47 (7.5A)
To t 2v lG1sToP sw T HBR( sw- - rur
A/T GEAR POSITIONINDICATOR
IGNITION COIL
Y
I
i
I
IBI-U
rsl
PARKINGBRAKEswrTcH
V
I
I
I
I
IGRN/REO
,t, I
l
I
IGnN,4,vHT
LT GRN
ELKi BI-U
RED
GRN/BLK
NoTEi if :ro 5V
T :To t2v
cRN ---l F----- GnN
Bru -J F------ 61U
8LK
II
Tl
G401G404
,o IJ'^A'
14-226

PCM Circuit Diagram (A/T Control System: 'gg - 00 Models)
UADEF D'SIFUSSFEUY 8OXr{o.2s (7 5A)
tGNtTtc{lSWTCHUNDER.OASNFUSF]NEUY 8OI
iPrE: T ro sv
INlD
,:--
^1 GETB POSITIoi{
14-230

PGM Terminal Voltage/Measuring Conditions ('99 - 00 Modelsl
A/T Control System
The PCM terminal voltage and measuring conditions are shown for the connector terminals that are related to the A/T con-trol system. The other PCM terminal voltage and measuring conditions are described in section 11.
PICM Connoctor Terminrl Location3
Terminal NumberSignalDescriplionMeasuring Condhions/Torminal Voltage
A7ATP DA,/T gear position switch
E position input
InEposition:OV
In other than E] position: Approx. 1O V
A9ATP NPA/T gear position switch
@ and S positions input
In E and El positions: 0 V
In other than E] and E position: Approx. 1O V
A10Timing and adjustment service
check signal
With ignition switch ON {ll} and service check
connector oDen: 5 V
With ignition switch ON (ll) and service check
connector connected with soecialtool:0 v
ATP LA,/T gear position switch
I position input
In E position; OV
In other than E position: Approx. 10 V
STOP SWBrake switch signal outputBrake pedal depressed: Battery voltage
Brake pedal released: 0 V
PCM CONNECTOR B I25P}
Terminal NumberSignalDescriptionMoasuring Condhions/Terminal Vohage
B1IGPlPower supply circuit from main
relay
With ignition switch ON (lll: Battery voltage
With ignition switch OFF: 0 V
82PG1Ground
B8HLC LSMPH-PL control linear solenoidpower supply neqative electrode
B9IGP2Power supply circuit from main
relay
With ignition switch ON (lll: Battery voltage
With ignition switch OFF:0 V
810PG2Ground
817HLC LSPPH-PL control linear solenoid
power supplypositive electrode
With ignition switch ON {ll): Pulsing signal
818SC LSMStart clutch control linear
solenoid power supply negative
electrode
s20LGIGround
821VBUBack-up power supplyAlways battery voltage
B22Ground
825SC LSPStan clutch control linear
solenoid power supply positive
electrode
With ignition switch ON (ll): Pulsing signal
t
14-232

Electrical Troubleshooting (,96 - 9g Modelsl
Troubleshooting Flowchart - Shift Control Linear Solenoid
Possible Cause
' Disconnected 3olenoid h.rn€isconnoctor. Short or open in 3hift controllinear solenoid wire. Faulty shift control linear sole-noidSOLENOID HARNESS8P CONNECTOR
Terminal stde of male terminals
Wire side of female terminals
8LU/YEL
NOTE: Record all freeze data before you troubleshoot.
. OBD ll Scan Toot indicates CodeP1870.. Selt-dirgnosis [d indic.tor tightindicatos Code 30.
Measure Shift Control Linoar Sole-noid Resistance at the SolenoidHarness Connector:1. Disconnect the 8p connectorfrom the solenoid harness connector.2, Measu re the resistancebetlveen the No. 3 and the No.7 terminals ofthe solenoid haFness connector.
ls the resistance 3.8 - 6.8 O?
Check Shift Controt Linear Sote-noid for a Short Circuit:1. Disconnect the A (26p) con,nector from the TCM.2. Check for continuity betweenbody ground and the A3 terminal and the A16 terminalindividually.
Repair shon in tho wire6 betweonthe A3 and A16 termin.ts lnd thobody ground.
Measure Shitt Control Line.rSolenoid Resistance:1. Connect the 8P connector tothe solenoid harness connec,tor.2, Meas u re the resistancebetween the 43 and A16 ter-
Repair loose terminal oa open inthe wires between the 43 andA16 terminal3 and the solenoidharness connector.
ls the resistance 3.8 6.8 O?
Chock for loose TCM connectorc.ll necessary, substitute a known-good TCM and recheck.
BLU/WHT
GRN/YEL
TCM CONNECTOR A I26PI
GRN/YEL
ll 12l:
IriGlx
1578910111213
172t)232526
14-250

Troub|eshootingF|owchart_PH-PLControJLinearSo|enoid
NOTE| Record all treeze data before you troubleshoot
Possible cause
' Disconnected solenoid harness
connectof. Short or oPen in PH_PL control
linear solenoid wire. Faulty PH-PL control linear sole_
noidSOLENOIO HARNESS8P CONNECTOR
GRN/WHT
Terminal side of male termlnals
Wire side ol female terminals
. OBD ll Scan Tool indicates Codo
P1873.. sef-diagnosis E indicalor light
indicat6 Code 31.
Measure PH-PL Control Linear
Solenoid Resistance at the Sole_
noid Hatness Connectot:1. Disconnect the 8P connector
from the solenoid harness con-
nector,2. Measure the resistance
between the No 2 and the No.
6 terminals ofthe solenoid har
ness connector'
ls the resistance 3.8 - 6.8 0?
Check PH-PL Control Lineer
Solenoid for a Short Circuit:
1. Disconnect the A 126P) con-
nector lrom the TCM
2. Check for continuity between
body ground and the A2 ter
minal and the A15 terminal
individually.
Repair short in th€ wires
between the A2 and A15 lermi_
nals and the body glound.
Measute PH-PL Control Linear
Solenoid Resi3tance:1. Connect the 8P connector to
the solenoid harness connec-
tor,2, Meas u re the reslslance
between the ,q2 and A15 ter_
Rep.il loose tetminal or oPen in
th6 wires betwccn the A2 and
A15 lerminals and the solenoid
harness conn€ctol.
lsthe resistance 3.8-6 8 O?
Check for loose TCM connactors
lf neceasery, Substitute a known-good TCM and rechock.
PNK/BLK
TCM CONNECTOR A (26P)
oPNK/BLK
I234578I10l11213
11't5161720/,,/232526
IGRN/wHr
o
*r}l
t'T,
E[
PNK/8LK
3a5I910111213
1620232526
GRN/WHT
14-251