HONDA CIVIC 1998 6.G Workshop Manual

ldle Control System
lgy"t9!"_"ring Pressure (PSPI Switch Signal
('96 - 98 Models, '99 - 00 DlGy5 engine witn fU/f) (USAI
This signals the ECM/ PCN4 when the power steering load is high.
ECM/PCM CONNECTORS
PSP SWITCH 2P CONNECTOR
PSP SW IGRNI
JUMPER l--L I IwfRE -2/
GND (BLKI
Wire side ol female terminais
Inspection o{ PSP switch signal.
Check for an opon in the wire {PSPSW linelr1. Turn the ignition switch ON (ll).2. Measure voltage betweenECM/PCM connecror termi-nals A9 and C16.
Check lor an open in the wire (PSPSW line):1. Turn the ignition switch OFF.2. Disconnecl the PSP switch 2p
3. Turn the ignition switch ON (ll).4. At the harness side, connectthe PSP switch 2P connectorterminals No. l and No.2with a jumper wire.5. Measure voltage betweenECM/PCM connector terminalsAg and C16.
ls there lessthan 1.0 V?
- Repair open in the wirobetween the ECM/PCM lc16land the PSP switch.- Repair open in BLK wirebetwoen the PSP switch andG101.
ls there less than 1.0 V?Check the operation of the PSPswitch:'1. Start the engine2. Turn steering wheel to full
3- Measu re voltage betweenECM/PCM connector terminalsA9 and C16.
ls there battery voltage?
PSP switch signel is OK.
Wire side oI temale terminals
11-212
(To page 11'2'13)

t
(From page 11 212)
Check lor a 3hort in the PSP
switch:1. Turn the ignition switch OFF.
2. Disconnect the 2P connector
from the PSP switch.
3. Turn the ignition switch ON (ll)
4. Measure voltage between
ECM/PCM connector termi-
nals Ag and C16.
Check tor a short in the wiro {PSP
SW linel:'1. Turn the ignition switch OFF.
2. Disconnect the ECM/PCM con
nector C (31P).
3. Check lor continuity between
body ground and ECM/PCM
connector terminal C16.
ls there battery vohage?
Repair ahort in the wire between
the ECM/PCM (C16) and th6 PsP
switch.
Substitute a known_good ECM/
PCM end rechock. lf Prescribedvoltage b now avsilable. rePlace
the original ECM/PCM.
ECM/PCM CONNECTORS
Wire side of temale terminals
'l
12a6189t0
tl12131415161718
232125a30
oPSP SW (GRNI
1-213

ldle Control System
Power Steering Pressure (PSP) Switch Signal
('99 - 00 Models except Dl6y5 engine with M/T) (USAI
This signals the ECM/PCM when the power steering load is high.
Wire side of female terminals
PSP SWTTCH 2P CONNECTOR (qts6)
PSP SW (GRN)
JUMPER T---7 1 \wlRE LJ- 2-l
GND IBLK)
Wi16 sid6 of temale terminals
ECM/PCM CONNEgTORS
Inspoction ot PSP switch signal.
Check for an op€n in the wire (PSPSW linel:1. Turn the ignition switch ON (ll).2. Measure voltage between ECN4/PCM connector terminals 426and 820.
Check for .n open in tho wire IPSPSW line):1. Turn the ignition switch OFF.2. Disconnoct the PSP switch 2Pconnector.3. Turn the ignition switch ON (ll).4. At the wire side, connect thePSP switch 2P connector ter-minals No. 1 and No.2 with ajumper wire.5. Measure voltage between ECM/PCNI connoctor terminals 426and 820.
ls there lessthan 1.0 V?
- Ropai. opgn in ths wire be-tw.€n the ECM/PCM {A261rnd th6 PSP switch.- Ropsir opon in BLK wi.o bo-twoen tho PSP switch andG101.
ls there less than 1.0 V?Check the operation ot the PSPsw;tch:'1. Start the engine2. Turn steering wheelslowly.3. Measure voltage between ECM/PCM connector terminals 426and 820.
ls there battery voltage?
PSP switch sign8l i3 OX.
11-214
(To page 11-215)

\
(From page 11'2141
Check lor a short in tho PSP
swhch:1. Turn the ignition switch OFF
2. Disconnect the 2P connector
from the PSP switch
3. Turn the ignition switch ON {ll)
4. Measure vohage between ECW
PCM connector terminals A26
and 820.
Ch6ck for a short in tho wiro IPSP
SW lino,:1. Turn the ignition switch OFF
2. Disconnect the ECM/PCM con-
nector A (32P).
3. Check for continuity betweon
body ground and ECM/PCM
connector terminal A26
Rogair short in the wiro b€{woon
the ECM/PCM (A26) and the PSP
switch.
Substitute a known_good ECM/
PCM rnd r.check. lf Prdcribodvohago is now avaihblo' rcPl.co
the original ECM/PCM
ECM/PCM CONNECTORS
ECM/PCM CONNECTOR A I32P)
Wire side of lemale terminals
Wire side of female terminals
'l'
5-21

ldle Control System
Automatic Transaxle (CVTI Gear Position Signal
('96 -98 D16Y5 engine with CW)
ATP NP{LT GRNI
INP
GBN)
This signals the ECM when the transmission is in @ or @ position.
Check the operation oI the A/Tgear position switch:1. Turn the ignition switch ON flt).2. Observe the A/T shift positionindicator and select each position separately.
See lhe A/T gear position indica-tor insp€ction {see sec{ion l/tl.
Check tor a short in the wir6 (ATpNP line):1. Turn the ignition switch OFF.2. Disconnect the 14P connectorIrom the gauge assembly.3. Disconnect the 26P connectorfrom the TCM.4. Turn the ignition switch ON fll).5. Measure voltage between ECMconnector terminals A9 andc29.
Check for a short in the wire lATpNP linell1. Turn the ignition switch OFF.2. Disconnect the ECM connector C (31P).
3. Check for continuity betweenbody ground and ECM connector terminal C29.
ls there approx. 5 V?
Check for an open in the wire lATpNP lina):1. Turn the ignition switch OFF_2. Beconnect the 14P connectorto the gauge assembly.3. Reconnect the 26P connectorto the TCM.4. Sta rt the engine.5. Measure voltage betweenECM connector terminals A9and C29 with the transmission in E and E posationt
Repair short in the wire betweenthe ECM {C291 and the gaugeassemblv,
Substitute a known-good ECMand recheck. lf prescribed volt-age is now avrilable, replace theo.iginalECM.
Wire side ot female terminals
2457I910
t112131a15151718
2321252930
ATP(LT io
(To page 11'217)
11-216

t
L
(From page 11-216)- Repair open in the wire
between the ECM {C291 and
lhe Ituge assomblv.- Repair open in the wire
betwoen the gauge assembly
and the A/T gea. Positionswitch.
ls there less than 1.0 V?
Chock for a short in the wite (ATP
NP line):Measure voltage between ECM
connector terminals Ag and C29
with the transmission in gear.
ReDair short in the wire be'tween
ECM (C291 and gauge a3somblY.ls there battery voltage?
A/T g€ar position signal is OK
LG1 IEBN/BLK)
ECM CONNECTORS
ATP NPWire side of female terminals (LT GRN)

ldle Control System
{
(
a
Clutch Switch Signal (Dl6YS engine with M/Tl
This signals the ECM when the clutch is engaged.
A {32P}
ECM CONNECTORS
LGl (BRN/BLK)
\-
cLsw(RED}
Inrpaction ot dutch rwitch signal.
Check for on opon in the wiro(CLSW linel:'!. Turn the ignition switch ON (ll).2. Measure voltage betweon ECt!4connector terminals C29 andA9.
Ch.ck tho clutch switch:1. Turn the ignition switch OFF.2. Disconnect the 2P connectorfrom the clutch switch.3. Turn the ignition switch ON (ll).4. Measure voltage b€tween ECMconnector terminals C29 and
ls thare approx. 5 V?
ls there approx. 5 V?
Check for a short in th6 wire(CLSW line)l1. Turn the ignition swirch OFF.2. Disconnect the ECM connector C (31P)trom the ECM.3. Check lor continuity betweenECM connector terminal C29and body ground.
Chcck for an open in thg wire{CLSW linel:1. Depress the clutch pedal.2. Moasure voltage between ECMconnector torminals C29 andA9.
Repair short in the wirc betweentho ECM {C291 and tho clurchswitch.
Sub3titutg a known-good ECMand rechock, It p.e3cribed vohagoi! now available, roplace the orig-inal ECM.
Wire side of female terminals
26189101l12t3'tat5l617l822
o
(To page 11-219)
11-218
!

{From page 11-218)
Check lho clutch switch:
1. Turn the ignition switch OFF.
2. Disconnect the 2P connector
from the clutch switch.
3. Check lor continuity between
the clutch switch connector
terminals No. 1 and No.2 with
the clutch pedal depressed
ls voltage less than 1.0 V?
- Adiu3t the clutch swiich.- Reolace lhe clutch switch.
Check for an open in tha wiie:
1. Turn the ignition switch ON lll)
2. Measure voltage between the
clutch switch connector terml'nal No. 1 and body ground with
the clutch pedal depressed.
Repair op€n in the wire betwoen
the EcM (C291 and thc clutch
swilch.ls there approx. 5 V?
Repair open in BLK wire betweenthe clutch switch and Gircl.
Clutch switch signal is OK.
CLUTCH SWITCH 2P CONNECTOR
j-t -
Terminal side of male
termrnals
CLUTCH SWITCH 2P CONNECTOR {C41',
-f--r
I'l'l-l_-
clsw 1;1tREDr Y
Wire 6ide of lemaleterminals
I
lr,
11-219

ldle Control System
ldle Speed Setting
Inspection/Adiustmenl
'96, '97 Dl6Y5. '96 - 00 Dl5Y8 sngine with M/T
NOTE:
. Before setting the idle speed, check the following
items:- The MIL has not been reported on.- lgnition timing- Spark plugs- Air cleaner- PCV system
o (Canada) Pull the parking brake lever up. Start the
engine, then check that the headlights are off.
1. Start the engine. Hold the engine at 3.000 rpm withno load (taansmission in neutral) until the radiatorfan comes on, then let it idle.
2. Connect a tachometer.
3. Disconnect the IAC valve connector.
4.lf the engine stalls, restart the engine with the accel-
erator pedal slightly depressed. Stabilize the rpm at1,000, then slowly release the pedal until the engineidles.
Check idling in no-load conditionsr headlights. blowerfan. rear defogger, radiator fan, and air conditioner
are not operating.
ldle spsed should be:
450 1 50 rpm
11-220
Adjust the idle speed, if necessary, by removing thecap and turning the idle adjusting screw.
NOTE; After adjusting the idle speed in this step,recheck the ignition timing (see section 23).
lf it is out of spec, go back to step 4.
IDLE
6. Turn the ignition switch OFF.
7. Reconnect the 2P connector on the IAC valve, then
do the ECM reset procedure.
8. Restart and idle the engine with no-load conditionsfor one minute, then check the idle speed.
NOTE: (Canada) Pull the parking brake lever up.Start the engine, then check that the headlights areoff.
ldle sp€sd should b€:
670 i 50 rpm IUSA)750 t 50 rpm {Canada}
9. ldle the engine tor one minute with headlights {Low)ON. and check the idle speed.
ldle speed should be:
750 :r 50 rpm
10. Turn the headlights off. ldle the engine for oneminute with heater fan switch at Hl and air conditioneron, then check the idle speed.
ldle speed should be:
810150 rpm
NOTE: lf the idle speed is not within specification,see Symptom Chan on page 11-84.

t
t
I
'96.'97 D16Y5 engine with CVT,'96 - 00 D16Y8 ongins
with A/T and'96 - 00 Dl6Y7 €ngine
Adiust the idle speed using a Honda PGM Tester if pos-
sible. lf not, use the following procedure:
NOTEI
. Leave the IAC valve connected
. Betore setting the idle speed. check the following
items:- The MIL has not been reported on'
- lgnition timing
- Spark Plugs- Air cleaner- PCV system
1. Connect a tachometer.
2. Start the engine. Hold the engine at 3,000 rpm wirh
no load (in Park or neutral) until the radiator fan
comes on, then let it idle.
3. Check the idle speed with no-load conditions: head-
iights, blower fan, rear defogger, radiator fan, and
air conditioner are not operatlng
ldl€ spoed should be:
USA:
D16Y5 engine with CVT, D16Y7 engine with A/T'
Dl6YB engine with A/T:
700 :r 50 rpm (in E or El Positionl
D16Y7 engine with M/T:
670 i 50 rpm
Canada:
Dl6Y8 sngin€, Dl6Y7 engins:
M/T750 t 50 rpm
NT750 1 50 rpm (in E or El Position)
Adjust the idle speed, if necessary, by removing the
cap and turning the idle adiusting screw 1/2-turn
clockwise or counterclockwise
D16Y5, D16Y8 engine:
IDLEADJUSTING
Dl6f, ongine:
NOTE: When you remove the ACL housing, do not
disconnect the IAT sensor connector
After turning the idle adjusting scrow 1/2-turn'
check the idle speed again. lf it is out of spec, turn
the idle adjusting screw 1/2-turn agaan'
NOTE: Do not turn the idle adjusting screw more
than 1/2-turn without checking the idle speed'
ldle the engine for one minute with heater fan
switch at Hl and air conditioner on, then check the
idle speed.
ldle speed should be:
M/T810150 rpm
A/T. CvT810 t 50 rpm (in El or E Position)
NOTE:
. Do not turn the idle adjusting screw when the air
conditioner is on.
. lf the idle speed is not within specification. see
Symptom Chart on page 11-84 (cont'd)
11-221