1999 HONDA CIVIC mat

Description
Power Flow (cont'dl
lst Gesr (E or @ position)
In lE or E position, the optimum gear is automatically selected from 1st,2nd,3rd and 4th gears, according to conditionssuch as the balance between throttle opening (engine load) and vehicle speed.
1. Hydraulic pressure is applied to the 1st clutch, which rotates together with the mainshaft, causing the mainshaft 1stgear to rotate.
Power is transmitted to the countershaft 1st gear, which drives the countershaft via the one-way clutch.
Power is transmitted to the final drive gear, which drives the final driven gear.
TOROUE CONVERTER
MAINSHAFT 1ST GEAR
lST CLUTCH
MAINSHAFT
AY CLUTCH
FINAL DRIVE GEAR
PARK GEAR
L
COUNTERSHAFT1ST GEAR
14-8

Description
Electronic Control System {cont'dl
Ascending Control
When the PCM determines that the vehicle is climbing a hill in E position, the system oxtends the sngagement area of2nd gear and 3rd gear to prevent ths transmission from fr€quently shifting between 2nd and 3rd gears, and between 3rdand 4th gears, so the vehicle can run smooth and have more power when needed. There are two ascending modes withdifferent 3rd gear driving areas according to the magnitude of a gradient stored in the pCM.
NOTE:
. The PCM memory contains shift schedules between 2nd and 3rd gears, and between 3rd and 4th gears that enable thePCM's fuzzy logic to automatically select the most suitable gear according to the magnitude of a gradient. Fuzzy logic is a form of artificial intelligence that lets computers respond to changing conditions much like a humanmind would,
Dssconding Control
When the PCM determines that the vehicle is going down a hilt in E position, the shift-up speed from 3rd to 4th gearwhen th€ throftle is closed becomes faster than the set speed for flat road driving to widen the 3rd gear driving area.This, in combination with engine braking from the deceleration lock-up, achieves smooth driving when the vehicle isdescending. There are two descending modes with different downshift (4 - 3) schedules according to the magnitude of agradient stored in the PCM. When the vehicle is in 4th gear, and you are decelerating on a gradual hill, or when you areapplying the brakes on a steep hill, the transmission will downshift to 3rd gear. When you accel6rate, the transmission willthen return to 4th gear.
ASCENDING MODEDESCENDING MODE
4TH SHIFTING
L.
F
CHARACTERISIICSCONTROL AREA
ff.1"11", vehicr. 3pe€dff;Tlr., vohicre speed
GRADUAL ASCENOINGCONTROL AREA
Docel6ration Control
When the vehicle goes around a corner. and needs to first decelerate and then accelerate. the rcM sets the data for decelerationcontrol to reduce the number of times the transmission shifts. When the vehicle is decelerating from speeds above 26 mph(41 km/h), the rcM shifts the transmission from 4th to 2nd earlier than normal to cope with upcoming acceleration.
14-16

\
@ Position
As the engine turns, the ATF pump also starts to operate, Automatic transmission fluid (ATF) is drawn from (99) and dis-
charged into (1). Then, ATF flowing from the ATF pump becomes the line pressure (1). The line pressure (1) is regulated
by the regulator valve. The torque conv€rter inlet pressure (92) enters (94) of the torque converter through the lock-up
shift valve and discharges into (901. The torque converter ch€ck valve prevents the torque converter pressure from rising'
Under this condition, the hydraulic pressure is not applied to the clutches'
NOTE: When used, "1eft" or "right" indicates direction on the hydraulic circuit'
14-25

Symptom-to-Component Ghart
Electrical System -'gG - 98 Models
*1: The DTC in the parentheses is the code E indicator light indicates when the Data Link connector is connected to theHonda PGM Tester.*2: Whenever the Honda PGM Tester or Scan Tool detects an automatic transmission control system DTC, p07OO will beset in the PGM-FI control svstem.
DTCIIE Indicaior
LightMILDotection ltemPage
P1753
fl)BlinksONLock-up control solenoid valve A14-56
P1758
\21BlinksONLock-up control solenoid valve B14-58
P1705
(51BlinksONAy'T gear position switch (short to groundl14-60
P1706
(6)OFFONA,/T gear position switch (open)14-62
P0753
l7lBlinksONShift control solenoid valve A14-64
P0758
{8)ElinksONShift control solenoid valve B14-66
POl20
(9)BlinksONCountershaft speed sensor14-68
P0715
{15)
'96 - 97
models:
OFF'98 model:
Blinks
ON
Mainshaft speed sensor
14-70
P1768
{16)BlinksONLinear solenoid't 4-72
P0740
(40)OFFONLock-up control system14-7 4
P0730
(41)OFFONShift control system14-75
P0700*,
(none)Automatic transmission control svstem in the pGM-Fl
control svstem
14-52

Symptom-to-Component Chart
Electrical System -'99 - 00 Models
*1: The DTc in the parentheses is the code E indicator tight indicates when the Data Link connector is connected to theHonda PGM Tester.*2: Whenever the Honda PGM Tester or scan Tool detects an automatic transmission control system DTc, p07oo will beset in the PGM-FI control svstem
DTC*IE Indicator
LightMILDotostion ltemPage
P1753
fi)BlinksONLock-up control solenoid valve A'14-80
P1758
t2lBlinksONLock-up control solenoid valve B14-82
P1705
{5}BlinksONAy'T gear position switch {short to ground)14-84
P1706
(6)OFFONy'VT gear position switch {open)14-81
P0753
\71BlinksONShift control solenoid valve A14-89
P0758
(8)BlinksONShift control solenoid valve B14-9r
P0720
(9)BlinksONCountershaft speed sensorr4-93
P0715
(15)B linksONMainshaft speed sensor14-95
P1768
(16)BlinksONLinear solenoid't 4-97
PO7 40(40)OFFONLock-up control system14-99
P0730
(41)OFFONShift control svstem14- 100
P0700*,
(none)OFFAutomatic transmission control system in the pGM_Fl
controt svstem
14-54

Road Test
NOTE: Warm up the engine to normal operating tem peratu re (the rad iator fan comes on )'
1. Apply parking brake and block the wheels. Start the engine, then shift to E position while depressing the brake
Dedal, Depress the accelerator pedal and release it suddenly. The engine should not stall'
2. Repeat same test in E Position.
3. Test-drive the vehicle on a flat road in the E position. Check that the shift points occur at approximate speeds shown
in the table. Also check for abnormal noise and clutch slippage.
NOTE: Throttle position sensor voltage represents the throttle opening
a. Unbolt the PCM for road testing; refer to page 14-50.
b. Setthedigital multimeter to check the th rottle position sensor voltage between PCM terminals;
. '96 - 98 models: D1 {+) and A9 (-) or 422 (-}.
. '99 - 00 models: C27 (+) andB20t-) orB22{-}.
BACKPROBE ADAPTER
BACKPROBE SET07sAz - 001oq)A{two requiredl
DIGIIAL MULTIMETERlCommercially available)KS-AHM-32-003,or equivalenl
'96 - 98 Modelsr
Wire side ol temale terminals
PCM CONNECTORS
B t25Pl c (31P)
LG1 IBRN/BLK)
I (25P1c (31P}
A t32PtD (16P)
Wire side ol female terminals
'9!t - 00 Models:
1+113

Fluid Level
Ghecking
NOTE: Keep all foreign particles out of the transmis-
sron.
1.Warm up the engine to normal operating tempera-
ture (the radiator fan comes on)
Park the vehicle on the level ground, then turn off
the engrne.
Remove the dipstick (yellow loop) from the trans-
mission. and wipe it with a clean cloth.
Insert the dipstick into the transmrssron
Remove the dipstick and check the fluid level lt
should be between the upper mark and lower
marks.
UPPER MABKLOWER MARK
lf the level is below the lower mark, pour the recom-
mended fluid into the tiller hole to bring it to the
upper mark. Always use Genuine Honda Premium
Formula Automatic Transmission Fluid (ATF). Using
a non-Honda ATF can affect shift quality
K
L
DIPSTICK IYELLOW LOOPI
7. Insert the dipstick back into the transmission in the
direction shown.
FRONT
Installthe dipstick in the extent
of the direction shown.
14-117

Fluid Level
Changing
NOT€: Keep all foreign particles out of the transmis-sion.
'1.Bring the transmission up to operating temperature(the radiator fan comes on) by driving the vehicle.
Park the vehicle on the level ground, and turn theengine off.
Remove the drain plug. and drain the automatictransmission fluid (ATF).
NOTE: lf a cooler flusher is to be used, see page 14-187 and 14-188.
TRANSMISgION END OOVER
DNAIN PLUG18 x 1.5 mm49 N.m (5.0 kgtm, 36lbf.ftlSEALING WASHERReplace.
Reinstall the drain plug with a new sealing washer,then refill the transmission with the recommended
fluid into the filler hole to the upper mark on thedipstick. Always use Genuine Honda premium
Formula Automatic Transmission Fluid (ATF). Usinga non-Honda ATF can aftect shift quality.
Automatic Transmission Fluid Capacity:
2.7 | |'2.9 US ql,2.a lmp qtl at Ghlnging
5.9 f 16.2 US qt. 5.2 lmp qt) at overhaul
I
14-11A