check engine ACURA INTEGRA 1998 Service Manual PDF

PGM-FI System
Crankshaft Speed Fluctuation {CKF) Sensor
lT13a6l Tje scan tool indicates Diagnostic Trouble Code (DTC) P'1336: lntermittent interruption in the Crankshaft Speed: Fluctuation {CKF) sensor orcurt.
The scan tool indicates Diagnostic Trouble Code (DTC) P1337: No signal in the Craqkshatt Speed Fluctuation (CKF)
sensor circuit.
DescriDtion
The diagnostic system has a pulser rotor on the crankshaft and a pulse pick-up sensor on the engine block. The ECM mon-
itors the crankshaft speed tluctuation based on the CKF sensor signal, and judges that an engine misfire occurred it the
lluctuation goes beyond a predetermined limit.
CKF SENSOR CONNECTOR IC 110)
T:lr+T
IJI',Icrr e -f-fcxr na
{BLU/RED} (D lwHr/REDI
Terminal side of male termanals
- The MIL has beon.ooorted on.- DTC P1336 and/or P1337 arostoaed.
Problem vo.itication:1. Do the ECM Reset Proced!re.2. Start the engine.
lntermittent feilure, swtem is OKat ihis timo. Chcck for ooor oon-noctions or loose wir* ei C110(CKF sonsor) and ECM.
Check for an open in tho CKF sen-sor:1. Turn the ignition switch OFF.2, Disconnect the CKF sensor con-
3. Measu re the resistancebetween the CKF sensor 2Pconnector terminals No. 1 andNo.2.
ls there 1.6 - 3.2 kO?
Check lor . short in tho CKF sen-30t:Check for continuity betweenbody ground and the CKF sensor2P connector terminals No. 1 andNo.2 individually.
ls there continuity?
(To page 11-91)
1 1-90
T:]lf -rl11 2|
TTcKF P /6 6 CKF M
relul Y\Z twxvneotneot ,-- | L

nsnan upeeo rlucruauon lunF, Densor lconr q,
The scan tool indicates Diagnostic Trouble Code (DTC) P1359: A problem in the Crankshaft Position,Top Dead
Cenler/Cylinder Position (cKP/TDC/CYP) sensor circuit.tPr3ssl
The MIL has been reported on.DTC P1359 is stored.
Problem verilication:1. Do the ECM Reset Procedure.2. Turn the ignition switch to theSTART {lll) positaon for 10 sec'
NOTE:. M/T: Clutch pedal must be
. A/T: Transmission in E or E
Intermittent failure, svstem isOK. Check for ooor connactionsor loos€ wi.es at C109 {CKP/TDC/CYP sensorl and ECM.
ls DTC P1359 indicated?
Check for poor connections orloose wires between the CKP/TDC/CYP sensor and the ECM.
Substitute a known-good ECMand recheck. It symptom/indica-tion goes away, replace ih6 origi-nal ECM.
PGM-FI System
Crankshaft Speed Fluctuatio(CKFI Sensor (cont'd)
ECM lnternal Circuit
\
L
I P1607 Tfre scan tool indicates Diagnostic Trouble Code (DTC) Pl607: An ECM Internal Circuit Failure A.
The MIL has been reported on.DTC P16O7 is stored.
Problem verification:1. Do the ECM Reset Procedure.2. Start the engine.3. Allow it to idle {or 5 seconds.
Inte.miftent failure, systom L OKst this iimo.ls DTC P1607 indicated?
Substitute a known-good ECMand .echeck. lf symptom/indica-tion goes away, replace the origi-nalECM.
-92

J
a
I
lF1660l Th"""untool indicates Diag nostic Trou ble code (DTC) P1660:Aproblem in theA./rf Fl data line.
Wire side of temale terminals
(conr'd)
ECM CONNECTOR C I31P}
ATCHK{BLUI
1 2 3 1l 15 6 710
11 t2 131r t5 16 1? t8'tg /21
././I l/nzex)
TCM CONNECTOR 26P (C,r2ol
7 r-T7 s 6 ;i-g-io-rrJzlil
15 16 17 / /.20 22 23 21 25 26
ATCHK IBLU)
o
ECM CONNECTOR C {31PI
Th6 MIL has been reported on.DTC P16GO is stored.
Problem verificationl1. Oo the ECM Reset Procedure.2. Turn the ignition switch OFF.3. Start the engane. Allow theengine at idle for one minute,
lntermittent failure, swtem is OKat lhis time. Check lor poor con-n€ctions or loose wires at C420ITCMI and ECM.
ls DTC P1660 indicated?
Check for an open in the wire
{ATCHK line}:1. Turn the ignition switch OFF.2. Check for continuity betweenECM connecto. terminal C19and TCM 26P connector terminal No.20.
Repair open in the wire betweenECM (Cl9) and TCM.ls there continuity?
Check tor a short in the wire{ATCHK line):1. Disconnect the ECM conoec'tor C (31P).
2- Disconnect the 26P connectorfrom the TCM.3. Check for continuity betweenbody ground and EcM connector terminal Cl9-
Repair short in the wire betweenECM lC19) and TcM.
(To page 11-94)
11-93

2.
1.
1.
2.
After the engine stans, the IAC valve opens for a certain time. The amount ol air is increased to raise the idle speed
about 150 - 300 rpm.
When the coolant temperature is low, the IAC valve is opened to obtain the proper fast idle speed. The amount of
bypassed air is thus controlled in relation to the engine coolant temperature.
IDLE SPEEDtrpm,
ENGINECOOLANT TEMPERATURE
140
50
104
40
-1 32
-20 0
176 ('F)
80 fcl
When the idle speed is out of specification and the scan tool does not indicate Diagnostic Trouble Code (DTC) P0505
or P'1508, check the following items:. Adiust the idle speed (see page '11-111)
' ALT FR signal (see page 11-101). Air conditioning signal {seepage'11-102)' Brake switch signal (seepagell-104)
. Starter switch signal (see page 11-1051. A,4 gear position signal (see page 1l 106) (A"/T)
. PSP switch signal (see page 11-108) (USA)
. Fast idle thermo valve (see page 11-110). Hoses and connections. IAC valve and its mounting O rings
ll the above items are normal, substitute a known-good IAC valve and readjust the idle speed (see page 'l I -1 1 l).
lf the idle speed still cannot be adjusted to specification (and the scan tool does not indicate DTC P0505 or P1508) after
IAC valve replacement, substitute a known-good ECM and recheck. lf symptom goes away, replace the original ECM.
11-97

ldle Control System
ldle Control System
i P0505 | fne scan tool indicates Diagnostic Trouble Code (DTC) P0505: ldle control system malfunction,
NOTE: ll DTC Pl508 is stored at the same time as DTC P0505, troubleshoor DTC P1508 first. then troubleshoot DTC P0505.
Possible Cause
. IAC valve mechanical malfunctiorr
. Fast idle thermo valve malfunction (A"/T)
. Throttle body clogged port, improper adjustment
. Intake manifold, gasket leakage
. Intake air hose loose, leakage
a Vacuum hoses leakage
. ECT sensor incorrect output
. Throttle Position sensor incorrect output
Troubleshooting Flowchart
Problem verification:1. Start the engine. Hold theengine at 3,000 rpm wath noload 1in Park or neutral) untilthe radiator fan comes on,then let it idle.2. With the scan tool, check thefollowing items.- Throttle position should beapprox. 10% with the throttle fully closed.Engine coolant tempera-ture should be 116 212F(80 - 100'c).lf they are not within thespec., repair the faulty sensor crrcuft,3 Check the engine speed atidle with no-load conditions:headlights, blower fan, reardefogger, radiator fan, and airconditioner are not operating,
- The MIL has been reported on.- DTC P0505 is stored.
ls it 750 t 50 rpm (81881,
818C1 engines), 800 I 50 rpm(818C5 engine)?
Intermittent failur6, svstsm is OKat this tim€.
ls it 550 rpm (81881,818C1
engines), 600 rpm {818C5enginelor less?
-98
(To page 11'99)(To page 11-99)

ldle Control System
Problem verification:'1. Do the ECM Feset Procedure.2. Sta rt the engine.
ldle Air Control (lAG) Valve
The scan tool indicates Diagnostic Trouble Code (DTC) P1508: A problem in the ldle Air Control (lAC) valve
crrcurt.
The IAC Valve changes the amount of air bypassing the throttle body in response to a current signal from the Eclvl in
order to maintain the proper idle speed.FTom AIB To INTAKECLEANER MANIFOLD
IAC VALVE CONNECTOR IC116}
YES
WIRE SIDE OF FEMALE TERMINALS
ECM CONNECTOR A {32PI
Check for an open or short in thewire IIACV line):1. Turn the agnition switch OFFand reconnect the IAC valve
2. Disconnect the ECM connector A (32P).
3. Turn the ignition swatch ON (ll).
4. M easu re voltage betweenbody ground and ECM connector terminal A12.
IACV {8LK/BLU}
tacv{BLK/BI-UI
The MIL has been reoorted on.OTC Pl508 is stored.
lntermittent failure, svstem is OKat this time. Check for ooor con-nections or loose wires at C116{lAC valvel and ECM.
ls DTC P1508 indicated?
Check tor an open in lhe wirellGPl line):1. Turn the ignition switch OFF.2. Disconnect the IAC valve con
3. Turn the ignition switch ON (ll).
4. Measure voltage betlveen bodyground and the IACV connectorterminalNo.2.
Repair open in the wire betweenIAC valve and PGM-FI main relav-ls there battery voltage?
Repair open or shon in the wi.ebetween ECM {A12l and lAc valve.ls there battery voltage?
Check the IAC velve function:Momentarily connect ECM con-nector terminals A12 and A10with a jumper wire several times.
Does the IAC valve click?
Substitute a known-good ECMand rocheck. lf symptom/indica-tion goes away. replace the origi-nal ECM.
','*',,'Llu.9', I l112 15 16 17 1a1o20/
l--12u1 z"-if1za-2"' . '1 .
910
t-r '21
Wire side of female terminals
JUMPER WIRE
1-100

This signals the ECM when the Alternator (ALT) is charging.
Alternator (ALT) FR Signal
Check lor a short in th€ wire {ALTF line):1. Oisconnect the ALT GRN 4P(3P)* connector from the ALT.2. Turn the ignition switch ON {ll).3. Measure voltage between ECMconnector terminals C17 and A9.
ECM CONNECTORSA t32Pt
LG1
c 13lPl
ALT F(WHT/FEDI
Wire side of female terminals
ALT GRN 4P CONN€CTOR {C119}
JUMPER WIRE
Wire side of female terminals
ALT GRN 3P CONNECTOB {C119)*
JUMP€RWIRE
Wire side ot female terminals
12 15 t6 rr t8 19I
?
oALT F(WHT/REOI
23aI10
t112t3t5l6r819 ,/21
./,/,/2a29
[,ALT FIWHT/RED)
12339
11 12l517 tla19 ,/21
Inspection of ALT FR Signal.
Check for a shon in the wire {ALTF line):1. Turn the ignition switch OFF.2. Disconnecl the negative baatery cable from the battery.3. Disconnect the ECM connectorc (31P).
4. Check for continuity betweenbody ground and ECM con-nector terminal C17.
ls there approx.5 V?
Check the operation ofthe ALT:1. Turn the;Onition switch OFF-2. Reconnect the ALT GRN 4P(3P)* connector to the ALT.3. Start the engine. Hold theengine at 3,000 rpm wkh noload {in Park or neutral) untilthe radiator fan comes on,then let it idle.4. Measure voltage bet/veen ECMcon nector termina ls C17 and A9.
Ropair short in the wir6 betweenth6 ECM (C17) and the ALT.
Substitute a known-good ECMand recheck. It prescribed voltagGis now available, replace th€ origi-nal ECM.
Does the voltage decrease whenheadlights and rear defogger areturned on?ALT FR signal is OK.
Check tor an open in the wire {ALTF line):1. Turn the ignition switch OFF-2. Disconnect the negative bat-tery cable from the battery.3. Disconnect the ECM connector C (31P).
4. Disconnect the ALT GRN 4P(3Pi* connector from the ALT.5. Connect the ALT GRN 4P (3p)*
connector terminal No. 4 (No.'l)* to body ground with a
6. Check for continuity betweenbody ground and ECM connector terminal C17.
Ropair open wire bstw€an theECM {C17} and rhe ALT.ls there continuity?
ri Canada
11-101

Starter Switch Signal
This signals the ECM when the engine is cranking.
NOTEI. M/T:Clutch pedal must be depressed.. A,/T: Transmission in E or E position.
Wire sida of female terminals
Check for an opon or short in thcwi.. ISTS lin.l:Measure voltage between ECMconnector terminals C6 and Agwith the ignition switch in thostart position (lll).
Inspect the No.31 STARTER SIG-NAL (7.5 Alluse in the under-dashfuse/relay box,
ls there battery voltage?
- Repair 3hort in the wire be-tween tho ECM lc6l rnd theNo. 31 STARTER SIGNAL (7.sAl tus€ or the PGM-FI mainr€lay.- Roplace the No. 31 STARTERSIGNAL 17.5 Al fuso.
Starter switch signal b OK.
Ropair open in tho wire botwaonih6 ECM {CGl and the No, 3lSTARTER SIGNAL {7.5 Al fuse.
11-105

{From page 11-'106)
Check tor an op€n in the wiro {ATpPN lin€):Turn the ignition switch OFF.Fgconnect the 10P connectorto the gauge assembly.Reconnect the 26P connectorto the TCM.stan the engine.M€asure voltage between ECMconnector termanals C29 andAg with the transmission inE position.
- Ropair open in th6 wiro bo-twoen tho ECM {C291 and thogru96 a3sgmbly.- Repair open in GRN wir. bo-twaan thc gauga !srembly.nd tho A/T g.ar po3itiongwitch.
ls there less than 1.0 V?
Chod( for an opon in tho wir6 (ATPPN linel:Measure voltage between ECMconnector terminals C29 and A9with the transmission in E] posi,tron.
R.psir op.n in GRN/WHT wirob€twcan th. gaugc rsr.mbly andthc A/T ge.r po.ition 3whch.
ls there less than 1.0 V?
A/T g6er position signal i3 OK.
a l32P)LGl{BRN/BLKI
Wire side of female terminals
ATP PN{I-T GRN/BLKI
11-107

Power Steering Pressure (PSP) Switch Signal (USA)
This signals the ECM when the power steering load is high.
ECM CONNECTORS
Check lor an open in the wire (PSP
SW line):1. Turn the ignition switch ON (ll).
2. Measure voltage between ECM
connector terminals C16 andA9.
A {32P1LGl{BRN/BLK)
c (31P}
PSP SWIGRNI
Wire side oI female termanals
PSP SwlTCH 2P CONNECTOR IC311I
PSP SW {GRNI
luupen r-{ r \wrRE 4rl
GND (BLK)
Wire side oI female terminalsi,
Inspection ot PSP switch signal.
Check lor an op€n in the wire (PSP
SW linel:1. Turn the ignition switch OFF
2. Disconnect the PSP swirch 2P
3. Turn the ignition switch ON (ll).
4. At the wire side, connect the
PSP switch 2P connector ter
minals No. 1 and No.2 with a
iumper wire.5. Measure voltage teNveen ECM
connector terminals C16 andA9.
ls there less than 1.0 V?
- Repair open in the wire be-
tween the ECM lcl6l .nd the
PSP 3witch.- Repai. open in BLK wire be'
tween the PSP switch and
G301.
ls there less than 1.0 V7Check the operation of the PSPswitch:1- Stan the engine2. Turn steering wheel to full
3. Measure voltage between ECM
connector terminals c16 andA9.
ls there battery voltage?
PSP switch signal is oK.{To page l1 t09)