1999 HONDA CIVIC End link

Electrical Troubleshooting ('96 - 98 Modelsl
Troubleshooting Flowchart - Shift Gontrol Solenoid Valve A
Po$ible Cau3e
. Disconnected shift controlsolenoid valve A connector. Short oi open in shift controlsolenoid valve A wire. Faulty shirt control solenoid
PCM CONNECTORS
' OBD ll Scan Tool indicates CodeP0753.. Sett{iagnosis E indicator lightblinks seven tim6.
Check tor a Short to Power:1. Turn the ignition switch OFF.2. Disconnect the A (32P) and B{25 Pi connectors trom thePCM.3. Turn the ignition switch ON {ll).4. Measure the voltage betweenthe 83 and A9 orA22 terminals.
Repair short to powe. in the wir6between the 83 terminal .nd theshift control solonoid valvo A.
Moa3ure Shift Control SolenoidValve A Resistanc€:1. Turn the ignition switch OFF.2, Measure the resistancebetween the 83 and A9 or A22terminals.
Ch€ck for loose PCM connectors.lf n€c6srry, subatitute a known-good solenoid valve a3,sembly orPCM end rocheck.
ls the resistance 12 - 25 0?
NOTE: Record all freeze data before you troubleshoot.
A t32Pl
To page 14-65
Wire side ol female terminals

Electrical Troubleshooting ('96 - 98 Models)
Th6 E indicstor light is on con-st.ntly {not blinkingl wheneveithe ignition switch is ON lll).
Measure 04 IND Voltage:1. Turn the ignition switch OFF.2. Disconnect the B 125P) connec-tor from the PCM.3. Turn the ignition switch ON (ll).
4. Measure the voltage betweenthe 813 terminal and bodyground,
Repair 3hort to pow€. in the wirobetween the 813 terminal endthc gauge asiombly.
Meaiure ATP Dil Voltage:1. Turn the ignition switch OFF.2. Connect the I (25P) connectorto the PCM.3. Turn the ignition switch ON (ll).4. Shiftto any position otherthan
5. Measure the voltage betweenthe 824 terminal and bodygrou nd.
Check for a short to ground on thowir6. It wire i3 OK, .eplac6 the A/Tgoar po3ition indbator,
Troubleshooting Flowchart - E Indicator Light On Constantly
a!
PCM CONNECTOR B (25P)
Wire side of lemale terminals
l.
14-7A

Electrical Troubleshooting ('99 - 00 Models)
Troubleshooting Flowchart - Lock-up Control Solenoid Valve B
NOTE| Record allfreeze data before you troubleshoot.
Possibla Cause
. Oisconnected lock-uD controlsolenoid velve A/B assemblyconnector. Short or open in lock-up controlsolenoid valv€ B wire. Faulty lock-up control solenoidvalve B' Open in VB SOL wirercM CONNECTORS
To page 14-83
' OBD ll Scan Tool indic.tes CodeP1758.. Self-diagnosis E indicatorlight blinks twice.
Chack for a Short to Power:1. Turn the ignition switch OFF.2. Disconnect the I (25P) and D(16P) connectors from thePCM.3. lurn the ignition switch ON (ll).4. Measure the voltage betweenthe D3 and 820 ot 822 tetmi-nals,
Repair short to power in the wirebetween the D3 terminal and thelock-up contlol solenoid valve B.
Measure Lock-up Control Sole-noid Vdlve I R8i3tance:1. Turn the ignition switch OFF.2, Measure the resistancebetween the D3 and 820 or822 terminals.
ls the resistance 12 - 25 O?
Measure VB SOL Voltago:1. Turn the ignition switch ON lll).2. Measure the voltage betweenthe D5 and 820 or 822 termi-nals.
Check for blown No. 15 {7.5 Alfus€ in the under-dash luse/releybox. It the fuse is OK, repair openin the wir6 between th6 DS terminal and the under-dash fuse/rebyoox,
ls there battery voltage?
Chock for loose te.minal fit in thePCM connectors. It necessary,substitute a known-good PCMend recheck.
B t2sP) ll D t15P)
Wire side ol female terminals
I {2sPt ll D (16Pt
B (25P1 D t16Pt
\
14-82

Troubleshooting Flowchart - Countershaft Speed Sensor
NOTE: Record all freeze data before you troubleshoot
Po$iblo Cause
. Loos€ or fsulty conneclionbetween the PCM and vehicle
hainoss' Disconnectod countersh.ft
spoed senaof connoctor. Short or opgn in counteBhaft
3Deed aensor wire. Faulty counloEhaft 3p€ed sen'
soa
COUNTERSHAFf SPEED
SENSOR CONNESTOR
Terminal side oI male terminals
FCM CONNECTOR D I16PI
rconl c
1+93
NC IBLUI
. OBD ll Scan Tool indicat6 Code
PO720.. Self-diagnosis E indicator light
blinks nin6times.
Check the countershaft sPeed
sensor installation, and check it
lor damage.
ls the countershaft speed sensor
installed properly, and not dam-
aged?
Reinstall or replace and rechock.
Measurg Counlershatt SPeed
Sgn3ol R6istance at tho Son3ol
Connector:1. Disconnect the 2P connector
from the countershaft sPeed
sensor.2, Measuro countershaft sPeed
sensor resistanca at the sensor
connector.
ls the resistance 400 - 600 O?
Chcck CounteEh.tt SPeed Sen'
sor lor a Short Circuit:1. Disconnect the D {16P) con
nector trom the PCM.2. Check lor continuity between
body ground and the D10 ter_
minal and D16 terminal indi-
vid!ally.
R6oai. short in tl|€ wi.6a bstwa€n
the D10 and D16 t.rminali end
tho countdthatt rP€od senaor.
To page 14 94
Wire side of temale terminals

Description
The Continuously Variable Transmission (CVT) is an electronically controlled automatic transmission with drive and driv
en Oullevs, and a steel belt. The CVT provides non stage speeds forward and one reverse. The entire unit is positioned in
line with the engine.
Transmission
Around the outside of the flywheel is a ring gear which meshes with the starter pinion when the engine is being staned.
The transmission has four parallel shafts: the input shaft, the drive pulley shaft. the driven pulley shaft, and the secondary
gear shaft. The input shaft is in line with the engine crankshaft. The drive pulley shaft and the driven pulley shaft consist of
movable and fixed face pulleys. Both pulleys are linked by the steel belt.
The input shaft includes the sun gear. The drive pulley shaft includes the forward clutch which mounts the carrier assem-
bly on the forward clutch drum. The carrier assembly includes the pinion gears which mesh with the sun gear and the ring
gear. The ring gear has a hub-mounted reverse brake disc.
The driven pulley shaft includes the start clutch and the secondary drive gear which is integral with the park gear' The sec-
ondary gear shaft is positioned between the secondary drive gear and the final driven gear. The secondary gear shaft
includes the secondary driven gear which serves to change the rotation direction. because the drive pulley shaft and the
driven oullev shaft rotate the same direction. When certain combinations of planetary gears in the transmission are
engaged by the clutches and the reverse brake, power is transmitted from the drive pulley shaft to the driven pulley shaft
to provide E, E, E, and El.
Electronic Control'96 - 98 Models:
The electronic control system consists of the Transmission Control Module (TCM), sensors, three linear solenoids, and a
inhibitor solenoid. Shifting is electronically controlled under all conditions'
The TCM is located below the dashboard, behind the kick panel on the driver's side.'99 - 00 Models:
The electronic control svstem consists of a Powertrain Control Module (PCM), sensors, three linear solenoids and an
inhibitor solenoid. Shifting is electronically controlled under all conditions. A Grade Logic Control System to control shift-
ing in E position while the vehicle is ascending or descending a slope.
The PCM is located below the dashboard, under the kick panel on the passenger's side.
Hydraulic Control
The lower valve body assembly includes the main valve body, the Pressure Low (PL) reguiator valve body, the shift valve
body, the start clutch control valve body, and the secondary valve body. They are positioned on the lower part of the
transmission housing.
The main valve body contains the Pressure High (PH) control valve, the lubrication valve, and the pitot regulator valve.
The secondary valve body contains the PH regulator valve, the clutch reducing valve, the start clutch valve accumulator,
and the shift inhibitor valve. The PL regulator valve body contains the PL regulator valve and the PH-PL control valve
which is ioined to the PH,PL control linear solenoid. The inhibitor solenoid valve is bolted on the PL regulator valve body.
The shift valve body contains the shift valve and the shift control valve. which is joined to the shift control linear solenoid.
The start clutch control valve body contains the start clutch control valve, which is joined to the start clutch control linear
solenoid. The linear solenoids and the inhibitor solenoid are controlled by the TCM or PCM. The manual valve body which
contains the manual valve and the reverse inhibitor valve, is bolted on the intermediate housing.
The ATF pump assembly is located on the transmission housing, and is linked with the input shaft by the sprockets and
the sprocket chain. The pulleys and the clutch receive fluid from their respective feed pipes, and the reverse brake receives
fluid from internal hydraulic circuit.
Shift Control Mechanism
Input from various sensors located throughout the vehicle determines which linear solenoid the TCM or PCM will activate.
Activating the shift control linear solenoid changes the shift control valve pressure, causing the shift valve to move. This
pressurizes the drive pulley pressure to the drive pulley and the driven pulley pressure to the driven pulley and changes
their effective pulley ratio. Activating the start clutch control linear solenoid moves the start clutch control valve. The start
clutch control valve uncovers the port, providing pressure to the start clutch to engage it(cont'd)
14-195
,!

Description
Clutches/Reverse Brake/Planetary Gear/Pulleys
Clulches/Reverse Brake
The CVT uses the hydraulically-actuated clutches and brake to engage or disengage the transmission gears. When
hydraulic pressure is introduced into the clutch drum and the reverse brake piston cavity, the clutch piston and the reverse
brake piston move. This presses the friction djscs and the steel plates together, locking them so they don't slip. Power is
then transmitted through the engaged clutch pack to its hub-mounted gear. and through engaged ring gear to pinion
gears.
Likewise, when the hydraulic pressure is bled from the clutch pack and the reverse brake piston cavity, the piston releases
the friction discs and the steel plates, and they are free to slide past each. This allows the gear to spin independently on its
shaft, transmitting no power.
Start Clutch
The start clutch, which is located at the end of the driven pulley shaft, engages/disengages the secondary drive gear.
The start clutch is supplied hydraulic pressure by its ATF feed pipes within the driven pulley shaft.
Forward Clutch
The forward clutch, which is located at the end of the drive pulley shaft, engages/disengages the sun gear.
The forward clutch is supplied hydraulic pressure by its ATF feed pipe within the drive pulley shaft.
Reverse Brake
The reverse brake, which is located inside the inte.mediate housing around the ring gear, locks the ring gear in E posi-
tion. The reverse brake discs are mounted to the ring gear and the reverse brake plates are mounted to the intermediate
housing. The reverse brake is supplied hydraulic pressure by a circuit connected to the internal hydraulic circuit.
Planetary Gear
The planetary gear consists of a sun gear, a carrier assembly, and a ring gear. The sun gear is connected to the input shaft
with splines. The pinion gears are mounted to the carrier which is mounted to the fo.ward clutch drum. The sun gear
inputs the engine power via the input shaft to the planetary gear, and the carrier outputs the engine power. The ring gear
is only used for switching the rotation direction of the pullev shafts,
In E. E, and E positions (forward range), the pinion gears don't rotate and revolve with the sun gear, so the carrier
rotates. In E] positjon {reverse range), the reverse brake locks the ring gear and the sun gear drives the pinion gears to
rotate. The pinion gears rotate and revolve in the opposite direction from the rotation direction of the sun gear, and the
carrier rotates with pinion gear revolution.
Pulleys
Each pulley consists of a movable face and a fixed face, and the effective pulley .atio changes with engine speed. The
drive pulley and the driven pulley are linked by the steel belt.
To achieve a low pulley ratio, high hydraulic pressure works on the movable face of the driven pulley and reduces the
effective diameter of the drive pulley. and a lower hydraulic pressure works on the movable face of the drive pulley to
eliminate the steel belt slippage. To achieve a high pulley ratio, high hydraulic pressure works on the movable face of the
drive pulley and reduces the eifective diameter of the driven pulley, and a lower hydraulic pressure works on the movable
face of the driven pulley to eliminate the steel belt slippage.
b
14-198

E, E, and E Positions {Forward Rangel
. Sta rt Clutch: engaged
. Forward Clutch: engaged
o Reverse Brake: released
1, The hydraulic pressure is applied to the forward clutch and the start clutch, and the sun gear drives the torward
clutch.
2. The torward clutch drives the drive pulleV shaft. which drives the driven pulley shaft linked by the steel belt.
3, The driven pulley shaft drives the secondary drive gear, via the start clutch.
4. Power is transmitted to the secondary driven gear, which drives the final driven gear.
NOTE: The working hydraulic pressure on the movable face of each shaft depends on the throttle opening position.
DRIVE PULI.f YFLYWHEELSTEEL AELT
CLUTCH
INPUT SHAFT
START CLUTCH
SECONDARY DRIVENGEAR
(cont'd)
FINAL DRIVEN GEAR
14-201

Troubleshooting Flowchart - Manifold
NOTE: Record all freeze data before you troubleshoot
Absolute Pressure {MAPI Sensor
TCM CONNECTORS
Wire side of female terminals
PG.iblo Cau3€
. Dkconnoctod manilold .bsoluto
ore33urc IMAP) sensor connoc'
lor. Short or opcn in MAP s.nsor
MAP sen3or
. OBD ll Scan Tool indicates Code
P1793,. self-diagno3b E indicato. light
indicat€s Code 12.
Chock tor Another Cod€ or MIL
Blinking:1. Turn the ignition switch ON (ll).
2. Check whether the OBD ll scan
tool indicates another code or
the Mal{unction Indicator LamP(MlL) blinks (sse section 11).
Does the OBD llscan tool indicate
another code or isthe lVlL blink-
in9?
Measure VREF voltage:
1. Turn the ignition switch OFF.
2. Disconnect the A (26P) and B
(22P) connectors trom the
TCM.3. Turn the ignition switch ON (ll).
4, Measure the voltage between
the B2O and A13 or A26 termr
nals.
R€pair opon or 3hort in the wire
botwoan the 820 t€.minal and
the EcM.lsthere aPprox.5 V?
Msasure MAP IPB) volt.ge:
Measure the voltage betlveen the
82 and A13 or 426 terminals.
Repair opon ot shorl in the wiro
betwesn the 82 torminal end th€
MAP sensol.ls there approx. 3 V?
Check for loo3e TCM conn€stors.
lf nec*sarY, sub3titute a known'
good TCM and rechock.
WHT/RED
14-249