ac system HONDA CIVIC 1999 6.G Workshop Manual

Troubleshootin g Procedures
Chccking the Diagnostic Trouble Code IDTC)with an OBD ll Scan tool or Honda PGM Tester
when the PCM senses an abnormality in the input or output systems, the pl indicator light in the gauge assembly willblink. When the 16P Data Link Connector (DLC) (located under the dash on the driver,s side) is connected to the OBD llScan Tool or Honda PGM Tester as shown, the scan tool or tester will indicate the Diagnostic Trouble Code (DTC) whenthe ignition switch is turned ON{ll).
lf the El indicator light or the MIL has been reported on, or lf a driveability problem is suspected, follow this procedure:
1. Connect the OBD ll Scan Tool (conforming to SAE J19781 or Honda PGM Tester to rhe 16p DLC. (See the OBD ll ScanTool or Honda PGM Tester user's manual for specific instructions. lf you are using the Honda PGM Tester, make sure itis set to the SAE DTC type.)
2. Turn the ignition switch ON (lll, and observe the DTC on the screen,3, Record all fuel and emission DTCS, A/T DTCS, and freeze data.4 lf there is a fuel and emissions DTC, first checkthe fuel and emissions system as indicated bythe DTC (except for DTCP0700). DTC P0700 means there is one or more A,/T DTC, and no problems were detected in the fuel and emissions cir-cuit of the PCM.
5. Write down the radio station oresets.
6. Reset the memory with the PGM Tester or by removing the BACK UP fuse in the passenger's under-dash fuse/relay boxfor more than 10 seconds.
7. Drive the vehicle for several minutes at speeds over 30 mph (50 km/hr), and then recheck for DTCS. lf the A"/T DTCreturns, go to the Symptom-to Component Chart on pages 14-52 and 14-53 for'96 - 98 models, and pages 14-54 and14-55 for the'99 - 00 models, lf the DTC does not return, there was an intermittent problem within the circuit. Makesure all pins and terminals in the circuit are tight, and then go to step g.
8. Reset the radio preset stations, and set the clock.
OBD ll SCAN TOOL orHONDA PGM TESTER
DAYA LINK CONNECTOR {16P}
14-44

Chocking th€ Diagnostic Trouble Code (DTCI
with the Servico Check Conneqtor and Sp€cialTool
When the PCM senses an abnormality in the input or output systems, the @ indicator light in the gauge assembly will blink
When the Service Check Connector (locat€d under the dash on the passengsr side) is connected with the special tool as
shown, the E indicator light will blink the Diagnostic Trouble Code (DTC) when the ignition switch is turned ON (ll).
When the E indicator light has been reported on, connect the Service Check Connector with the special too'.
Then turn ON (ll) the ignition switch and obssrve the E indicator tight.
CONNECTOBSERVICE CHECKCONNECTOR I2PI07PAZ -0010100
Codes 1 through 9 are indicated by individual short blinks, Codes 10 and above are indicat€d by a sories of long and short
blinks. One long blink equals 1O short blinks. Add the long and short blinks together to determine th€ code. After deter-
mining the code, refer to the electrical system Symptom-to Component Chart on pages 1+52 and 1+53 for'96 - 98 mod-
els, and 14-54 and 14-55 for the '99 - 00 models.
S€r DTC 1
s.. DTC 2
Long blinkShort blink lfiYa tim.!,
S€c DTC 15
(cont'd)
GAUGE ASSEMBLY
Short blink loncel
14-49

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

Electrical Troubleshooting ('96 - 98 Models)
Troubleshooting Flowchart - Lock-up Control System
NOTE: Record all freeze data before vou troubleshoot.
Possible Cause
Faulty Lock-up cont.ol system
NOTE: Do not continue with this troublesnoonnoother DTCS have been corrected.until the causes of any
. OBD ll Sc6n Tool indicatG Codem7{0.. Self-diagnosis E indicator lightindicates Code 40.
Check tor Another Code:Check whether the OBD ll scantool or the E indicato, lightindicates another code.
Perform lhe Troublo3hooiingFlowchart tor the indicatedCode(s). Recheck for cod. P07il0lilol aftor iroubl€3hooting.
Does the OBD ll scan tool orthe E indicator light indicateanother code?
Tast Line Pressure:Measure the line pressure (seepage 14-119 and 14-120).
Repair tho hydreulic aystem a3necessary {3ee page 14-119).
Replace the Lock-up ControlSolenoid Valve Assembly andR6check;1. Beplace the lock up controlsolenoid valve Ay'B assembly(see page 14-105).2. Turn the ignitaon switch OFFand reset the PCM by removing the BACK UP (7.5 A) fusein the underhood fuse/relaybox for more than 10 seconds,3. Using the scan tool, check tobe sure that the engine coolant temperature is in 176'F(80'C) and above.4. Drive the vehicle at 55 mph(88 km/h) constantly for morethan one minute.5. Recheck for code P0740 (40).
Does the OBD ll scan toolindicate code P0740 {40)?The systom k OK at this time.
l'.
14-74

Troubleshooting Flowchart - Shift Control System
NOTE: Record all freeze data before vou troubleshoot.
Possible Cause
Faulty shift control system
. OBD ll Scan Tool indicates CodeP0730.. Sell-diagnosis E indicator
light indicates Code ill.
Check tor Another CoderCheck whether the OBD ll scantool or the E, indicator lightindicate another code.
Perlorm ths TroubleshoolingFlowch.rt for the indic.t.dCode(sl. Recheck tor code m730
l4'l I atter troubleshooting.
Does the oBD ll scan tool orthe E indicato'. tight indicate another code?
Test lst, 2nd, 3rd and 4th Clutch
Pressure:Measure the 1st, 2nd, 3rd and 4th
clutch pressure (see page 14119
thru 14-121).
Ropair the hydrlulic systom !snecessary {see page 14-1 19 and11-1211.
ls each clutch pressure within
the service limit?
Replace Shift Control Solenoidvalve Assembly, Linear SolenoidAssambly and Rechock:1. Replace the shift controlsolenoid valve A'/B assembly(see page 14-106).2. Replace the linear solenoidassembly lsee page 14 108).3. Turn the ignition switch OFFand reset the PCM memory byremoving the EACK UP (7.5 A)tuse in the under hood fuse/relay box for more than l0
seconds,4. Drive the vehicle at over 12mph (20 km/h) in 1st, 2nd,3rd
and 4th gear for more than 30seconds at P1 position.
5. Recheck tor code P0730 (41).
Does the OBD ll scan tool orthe Ed indicator tight indi
cate code P0730 {41)?
The swt6m is OK et this time.
NOTE: Do not continue with this troubleshooting until the causes ot any
other DTCS have been corrected.

Troubleshooting Flowchart - Lock-up Control System
NOTE: Record all freeze data before vou troubleshoot.
Possibl€ Cause
Faulty Lock-up control sy3tem
NOTE: Do not continue with this troubleshootingother DTCS have been corrected.until the causes of any
OBD ll Scan Tool indicates Codem14/J.S€lf-diagnosis .D4l indicalor lightindicates Code 40.
Check for Another Code:Check whether the OBD ll scantool or the :E indicator lightindicates another code,
Perform the TroubleshootingFlowchart tor the indicatedCodels|. Rocheck to. code P0740(40) .fter troublBhooting.
ooes the OBD ll scan tool orrhe E indicator light indicateanother code?
Test Line Pressure:Measure the line pressure (see
page 14 119 and 14-120).
Repair the hydrrulic sy3tem asn6c6ssary (see page 14-1191.ls the lane pressure within theservice limit?
Replace the Lock-up ControlSolenoid Valve Assembly andRecheck:1. Replace the lock-up controlsolenoid valve A/B assembly(see page 14-105).2. Turn the ignition switch OFFand reset the PCM by removing the EACK UP (7.5 A) fusein the underhood {use/relaybox for more than 10 seconds.3. Using the scan tool, check tobe sure that the engine cool-ant temperature is in 176'F(80'C) and above.4. Drive the vehicle at 55 mph(88 km/h) constantly for morethan one minute,5. Recheck for code P0740 {40).
Does the OBD ll scan toolindicate code P0740 (40)?The svstem i3 OK .t this time.
14-99

Electrical Troubleshooting ('99 - 00 Modelsl
Troubleshooting Flowchart - Shift Control System
NOTE: Record allfreeze data before you troubleshoot.
Po33ibl. Crus6
Frulty 3hift control ryrtom
. OBD ll Scan Tool indicrtd Codem730.. Self-dirgnosis E indicatorlight indicst€. Codo 41.
Check for Anoth€. Code:Check whether the OBD ll scantool or the E indicator lightindicate another code.
Prrf orm tho Troublc!hootingFlowch.rt for th. indicrt.dCod.l3l. R.ch.ck tor cod. m730141| .tt r troubldhootlng.
Doesthe OBD llscan tool orthe E indicator light indi-cate another code?
Test 13t, 2nd, 3rd .nd 4th ClutchPrglture:Measure the 1st, 2nd,3rd and 4thclutch pressure (see page 14-119thru 14 121).
R.prir tho hydrlulic ayrtam aan.c.3t..y lr.o p!9. lil-119 rnd1+1211.
ls each clutch pressure withinthe service limit?
Roplace Shift Control SolenoidValve Asembly. Linoar Sol.noidAssembly .nd Recheck:1. Replace the shift controlsolenoid valve A/B assembly(see page 14-106).2. Replace the linear solenoidassembly {see page 14-108}.3. Turn the ignition switch OFFand reset the PCM memory byremoving the BACK UP (7.5 A)fuse in the under-hood fuse/relay box for more than 10seconds,4. Drive the vehicle at over 12mph (20 kn/h) in 1st, 2nd, 3rdand 4th gear lo. more than 30seconds at lPll position.5. Recheck for code P0730 (41).
Doesthe OBD Ilscan tool orthe E ;ndicator light indi-cate code P0730 (41)?Th. sFtcm b OK .t this time.
NOTE: Do not continue with this lroubleshooting until the causes ot anyother OTCS have beon corrected.
I
14-100

Symptom-to-Component Chart
Hydraulic System
SYMPTOMCheck these items on the Check lhese lems on
PROBABLE CAUSE List the NOTES LIst
Engine runs, but vehicle does not move in any gear.1.2,3,5,6,7.36,38 K, L, R, S
Vehicle moves in E, E, but not in lrl, pr-, position.6, 8, 9, 10, 30, 54c,M,o
Vehicle moves in Dl, E, El,lut not in E position.6,11,12.24C,L
Vehicle moves in -o1], @, @, Uut not in E position.4, 6, 14, 15c,L,o
Vehicle moves in E position.10, 12, 13,14, 16, 29, 33, 34, 35C,D
Excessive idle vibration.1.2, 19,32,36, 45, 41, 4a
Poor acceleration; flares on starting otf in E, [Dl] position
Stall rpm hiqh in !!1, p!1, E position.1,2,3,6,34, 41K,L,R
stall rom hioh in D.r, lD,l oosition.6. 8. 10C,D
5t"[ rprn rsn ^ a"t"t-at6,12C,D
14N
11 , 32. 45, 41 , 48
No shift19,20, 40, 48, 49G,L
Fails to shift in 81, pll position; from lst to 3rd gear22, 49
Fails to shift in 03, D. oosition; from lstto4th qear22.23, 48
Erratic upshifting.
1'2 upshift, 2-3 upshift, 3-4 upshift
1-2 upshift
3'4 upshift
58
21, 48
22, t9
23,la
Harsh upshift {1 2).12, 19, 20, 29. 50, 51, 57. 54
Harsh upshift (2'3).13, 19, 20, 24, 27 , 29, 50. 51 , 51 , 58C,D,E,H,L
Harsh upshift (3'4).14, 19, 20, 25, 28, 29. 50, 51 , 51 , IC, D, E, I,L
Harsh downshift (2-1)19, 20. 24, 43, 54, 57 , 58o
Harsh downshift (3-2).12, 19, 20,25, 43, 55, 57,5AC,D,E,H
Harsh downshift (4-3).13, 19, 20, 26, 43, 56, 57, 58C, D, E, I
Flares on 2-3 upshift.13, 19,20,24.21,51FI
Flares on 3-4 upshift.14, 19 . 20, 25. 24, 51E,L,N
Excessive shock on 2-3 uPshift.13. 19, 20, 24, 27 . 43. 50. 51 , 58E,L,N
Excessive shock on 3-4 uPshift.14, 19, 20, 25. 2A, 8, 50, 51 , 58E,L,N
Late shift from El position to Lq! or &l position.10, 30
Late shift from E position to E position.4, 14, 21,53o
Noise from transmission in all shift lever positions2,31K,L,O
Vehicle does not acceletate more than 31 mph {50 km/h)17
shift lever does not operate smoothly.6, 39P
Fails to shift; stuck in 4th gear.19, 48, 49
Transmission will not shift into park in [a] position6, 18, 39
Stall rpm high; all clutch pressures are in specification.41D,K,O
Lock up clutch does not disengage.19, 44, 45, 46. 41,50,51.54
Lock up clutch does not operate smoothly.19, 41, 44, 45, 46, 47, 50, 51, 58L
Lock-up clutch does not engage.19, 41, 4t, 15, 46, 41 ,50, 51, 57, 58FI
Vibration in all positions
(cont'd)

Symptom-to-Component Chart
Hydraulic System (cont'dl
G.
n,
set idle rpm in gear to specified idle speed. lf still no good, adjust motor mounts as outlined in enginesection of this manual.
lf the clutch pack is seized or is excessively worn. inspect the other clutches for wear, and check the orificecontrol valves, CPC valve and linear solenoid for free movement.
lf the linear solenoid is stuck, inspect the clutches for wear.
lmproper alignment or main valve body and torque converter housing may cause ATF pump seizure. Thesymptoms are mostly an rpm-related ticking noise or a high-pitched squeak.
lf the l st clutch feed pipe guide in the end cover is scored by the mainshaft, inspect the ball bearing forexcessive movement in the transmission housing. lf oK, replace the end cover as it is dented. The o-rinounder the guide is probably worn.
Replace the mainshaft if the bushing for the 4th feed pipe is loose or damaged. lf the 4th feed pipe is danFaged or out of round, replace the right side cover.
Replace the mainshaft if the bushing for the 1st feed pipe is loose or damaged. lf the 1st feed pipe is darn-aged or out of round, replace it.
A worn or damaged sprag clutch is mostly a result of shifting the transmission inthe wheels rotate in reverse, such as rocking the vehicle in snow.
or E position while
Inspect for damage and wear:
1. Reverse selector gear teeth chamfers.
2. Engagement teeth chamfers of countershaft 4th and reverse gear.
3. Shift fork for scuff marks in center.
4. Differential pinion shaft for wear u nder pin ion gears.
5. Bottom of 3rd clutch for swirl marks.
Replace items 1,2,3 and 4 if worn or damaged. lf transmission makes a clicking, grinding orwhirring noise,also replace mainshaft 4th gear, reverse idler gear. and countershaft 4th gear in addition to 1, 2, 3 or 4.lf differential pinion shaft is worn, overhaul differential assembly, and replace ATF strainer, and thoroughlyclean transmission, flush torque converter, cooler and lines.lf bottom of 3rd clutch is swirled and transmission makes gear noise, replace the countershaft and final drivengear.
Be very careful not to damage the torque converter housing when replacing the main ball bearing, you
may also damage the ATF pump when you torque down the main valve body. This will result in ATF pumpseizure if not detected. Use the oroper roors.
Install the main seal flush with the torque converter housing. lf you push it into the torque converterhousing until it bottoms out, it will block the fluid return passage and result in damage.
See flushing procedure, page 14-187 and 188.
lf the large clutch piston O-ring is broken, inspect the piston groove for rough machining.
lf the l-2 shift valve is stuck closed, the transmission will not upshift. lf stuck open, the transmission hasno 1st gear.
lf the znd orifice control valve is stuck. inspect the 2nd and 3rd clutch oacks for wear.
lf the 3-4 orifice control valve is stuck, inspect the 3rd and 4th clutch oacks for wear.
lf the clutch pressure control valve is stuck closed, the transmission will not shift out of 1st gear.
lf the ATF strainer is clogged with particles of steel or aluminum, inspect the ATF pump and differentialpinion shaft. lf both are OK and no cause for the contamination is found, replace the torque converter.
Inspect the frame for collision damage.
14-112