Page 344 of 1395
PGM-FI System
Grankshaft Speed Fluctuation (CKF) Sensor
fF13361l Tj":""l.tool indicates Diagnostic Trouble Code (DTCI P1336: Intermittent interruption inthe Crankshaft Speed: Fluctuation (CKF) sensor circuit.
The scan tool indicates Diagnostic Trouble Code (DTC) P1337: No signal in the Crankshaft Speed Fluctuation (CKF)
sensor circuit.
Description
The diagnostic system has a pulser rotor on the crankshaft and a pulse pick-up sensor on the engine block. The ECM/PCM
monitors the crankshaft speed fluctuation based on the CKF sensor signal, and judges that an engine misfire occurred if
the fluctuation goes beyond a predetermined limit.
37 mod.l:
CKF SENSOR 2P CONNECTOR IClO4I
T:]l-r'r Lll
l1 zLl''''CKF P I lcKF Mtalu/aeot fdJ twxrneor\-7
Terminal side of male terminals
(To page 11-113)
11-142
- Tho MIL ha3 been reported on.- DTC P1336 and/or P1337 arestored.
Problem verificrtion:1. Do the PCM Reset Procedure.2. Start the engine.
Intermittent {ailure, systom is OK.l thia timo. Ch6ck tor poor con-nections or loose wir$ at ClorlICKF sonsorl .nd at tho PCM.
Chock tor an opon in th6 CKF .en'30r:1. Turn the ignition switch OFF.2. Disconnect the CKF sensor 2Pconnector,3, M easure the resistancebetween the CKF sensor 2Pconnector terminals No. 'l andNo.2.
ls there 1.6-3.2 kO?
Check fo. a short in the CKF 3en-sot:Check for continuity betweenbody ground and the CKF sensor2P connector terminals No. 1 andNo.2 individually.
CKF SENSOR
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Page 346 of 1395
PGM-FI System
Grankshaft Speed Fluetuation (CKFI Sensor (cont'dl
.98 - 00 modols:
CKF SENSOR 2P CONNECTOR IClO'I
r-:-i-_ltr_- |l1 2ll,,-'CKF P I ICKF MtsLuneotTOl wlrrneo)\7
Terminal side of male terminals
r:l
t! El
.KFP XA"*."talu rneor \:f
f rwxvneor
ECM/PCM CONNECTOR C (31P)
CKF PIBLU/REDI
CKF M(WHT/BEOI
Wi16 side of l6male terminals
1278__l
-lI(o
T
161716't9202122
,/ 2s262728293()3l
M
- The MIL has boon reported on.- DTC P1336 and/or P1337 arestored.
ProblGm verification:1. Do the ECM/PCM Reset Pro-cedure,2. Stan the engine.
Inte.mittant failuro, 3y*om b OKat thb tima. Chack lor ooor con-nections or looso wirea at C10a{CKF sensorl and.t the ECM/PCM,
Chgck forun open in tho CKF son-sori1. Turn the ignition switch OFF.2. Disconnect the CKF sensor 2Pconnector.3. Measure the resistancebetween the CKF sensor 2Pconnector terminals No. 1 andNo.2.
lsthere 1.6 - 3.2 kO?
Check for a short in the CKF sen-
Check lor continuity betweenbody ground and the CKF sensor2P connector terminals No. 1 andNo.2 individually.
Check for an open in the wiresICKF linca):1. Feconnect the CKF sensor 2Pconnector.2. Disconnect ECM/PCM connec-tor C (31P).
3. Measure resistance betweenECM/PCM connector termi'nals C22 and C31.
Repair opon in the wir6 botwoonthe ECM/PCM 1C22, glll lnd th6CKF s6n3or.
ls there 1.6 - 3.2 kO?
(To page 11'1451
11-144
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Page 349 of 1395
ECM/PCM Internal Circuit
lFi6oil Th" """n tool indicates Diagnostic Trouble Code {DTC) P1607: An ECM/PCM Internal Circuit Problem.
- The MIL has been reoorted on.- DTC PlmT is slor6d.
Problom veritication:1. Do the ECM/PCM Reset Pro
2. Turn the ignition switch ON (ll).
3, Wait three seconds,
ls DTC P1607 indicated?
Sub3tiiut€ a known-good ECM/PCM and recheck. lf symptom/indication goes away, replace theoriginal ECM/rcM.
11-147
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Page 351 of 1395
ldle Control System
System Description
The idle speed of the engjne is controlled by the ldle Air Control (lAC) Valve'
The valve changes the amount of air bypassing into the intake manifold in response to electric current controlled by the
ECM/PCM. When the lAc valve is activated, the valve opens to maintain the proper idle speed.
YEL/ From PGM'FI
BLK TMAIN RELAY
VARIOUSSENSORS
4.
IAC VALVE
INTAKE MANIFOLD
After the engine starts, the IAC valve opens for a certain time. The amount of air is increased to raise the idle speed
about 150 - 300 rpm.
when the cootant temperature ts row, the lAc valve is opened to obtain the proper fast idle speed The amount o{
bvoassed air is thus controlled in relation to the engine coolant temperature
When the idle speed is out o{ specification and the scan tool does not indicate Diagnostic Trouble Code (DTC) P0505
or P1508, check the following items:
. Adjust the idle speed (see page 11-169, 170)
. Air conditioning signal (seepagell-1551
. ALT FR signal (see page 1l-159)
. Starter switch signal (see page 11-16'1)
. A,/T gear position signal (see section 14)
. PSP switch signal (seepagell-162)
. Brake switch signal (see page 11-165)
. Fast idlethermovalve (see page'11 168)
. Hoses and connecttons. IAC valve and its mounting O-rings
lf the above items are normat, suDslitute a known-good IAC valve and readjust the idle speed {see page 11-169, 170)
lf the idle speed still cannot be adjusted to specification (and the scan tool does not indicate DTC P0505 or Pl508)
after IAC valve reolacement, substitute a known-good ECM/PCM and recheck lf symptom goes away' replace the
original ECM/PCM.
11-149
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Page 353 of 1395
(From page 11-150)
{From page 11-150}
THERMO VALVE(A/T onlyl
Check the IAC valve:Disconnect the 2P connector from
the IAC valve.
Does the engine speed droP
or the engine stall?
Adiust the (basel idl€ speed lseepage 11-169, 1t0). Itihe ba3e idle
speed cannot be adiust€d, clean
the Dorts in the throttle body.
UPPER
Check the tast idle lhermo valve:
1. Turn the ignition switch OFF.
2. Remove the intake air ductfrom the throttle body.3. Start the engine and let it idle.
4. Put your finger on the lowerpon in the throttle body.
Check engine cool.nt level and for
air in the cooling sy3lem. lf OK,
reolace the f.st idle thermo valve.Does the engine speed drop?
Put your Iinger on the uPPer Portin the throttle body.
Check for vacuum leaks, make
sure the throttle valve is com'pletely clo3ed. and repair as nec-Does the engine speed droP?
Adjust the idle spoed lsee Page11-169. 1701. lf the adiustmentdoes not correct lhe problem,
r.olace the IAC valve.
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Page 354 of 1395
ldle Control System
ldle Air Control llAC) Valve
The scan tool indicates Diagnostic Trouble Code (DTC) Pl508: A probtem in the ldle Air Controt flAC) varvecircuit.
The IAC Valve changes the amount of air bypassing the throttle body in response to a current signal from the ECM/PCM inorder to maintain the proper idle speed.
37 model;
IAC VALVE 2P CONNECTOR {C132}
,f rcp'# IYEL/BI.(II2f-1-d)
Y
Wir€ side of female terminals
PCM CONNECTOR A I32PI
tacvIBLK/BLU)
From AIR To INTAKECLEANER MANIFOLD
Wire side of female terminals
The MIL has beon .eport€d on.OIC Pl508 is sto.ed.
Problem veiification:1. Do the PCM Reset Procedure.2. Start the engine, and warm itup to normal operating tem-perature.
Inte.mittent failure, systcm b OKat thi3 time. Check tor poo. con-nections or loose wircs at C132(lAC v.lvel and at the PCM.
ls DTC Pl508 indicated?
Check lor an open in the wir6{lGPl lins}:1. Turn the ignition switch OFF.2. Disconnect the IAC valve 2Pconnector.3. Turn the ignition switch ON {ll).4. Measure voltage between bodyground and the IAC valve 2Pconnector term inal No.2.
Repair open in the wire trctwoontha IAC v!lv6 and the PGM-Flmain relly.
Chock for an opan o. short in thowi.e (lACv linel:1. Turn the ignition switch OFFand reconnect the IAC valve2P connector.2. Disconnect the PCM conneclorA (32P).
3. Turn the ignition switch ON {ll).4, Measure voltage betweenbody ground and PCM con-nector terminal A12.
{To page 1l-153)
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Page 356 of 1395
The MIL has boen r.ported on.DIC Pl 508 b 3tored.
Problem veritication:L Do the ECM/PCM Reset Pro-cedure.2. Start the engine, and warm itup to normal operating tem-perature.
Int€rmittent failure, systom is OKal lhis timo. Check lor poor con-nections or looro wirca at C132(lAc vrlvel and .t rho EcM/PcM.
ls DTC P1508 indicated?
Chock tor an open in the wir6llGPl linel:1. Turn the ignition switch OFF.2. Disconnect the IAC valve 2Pconnector,3. Turn the ignition switch ON (ll).4. Measure voltage between bodyground and the IAC valve 2Pcon nector termina I No, 2.
Repair opon in the wira botwoonthe IAC valve and tho PGM-FImain aalay.
Check tor an open or short in thewire (IACV linel:1. Turn the ignition switch OFFand reconnect the IAC valve2P connector.2. Disconnect ECM/PCM con-nector B {25P).3. Turn the ignition switch ON {ll}.4. Measure voltage betweenbody ground and ECM/PCMconnector terminal 823.
Ropair open or short in thg wirebetween tho ECM/FCM lB23l andthe IAC valve.
ls there battery voltage?
Check the IAC valve func,tion:Momentarily connect ECM/PCMconnector terminals 823 and 82with a jumper wire several times.
Does the IAC valve click?
Subslitute . known-good ECM/PCM .nd rechock. lf symptom/indication goes aw.y, replac.th€ original ECM/PCM.
ldle Air Control (lAC) Valve {cont'd}
'98 - 00 models:
IAC VALVE 2P CONNECTOR {C132I
F rcpt*l tYELrBLxlI2/'-- rf)
Y
Wire side ot fem.le terminals
ECM/PCM CONNECTOR B (25PI
Wire side of female torminals
258
9'to1l13t7
1920212223
tAcv(BLK/BLUIv
PG1{BLKI
12 | t3 4 58
910 111317
1920 | 121)22
tAcv(BLK/
BLU)JUMPER WIRE
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Page 357 of 1395
Air Conditioning Signal
This signals the EcM/PcM when there is a demand for cooling from the air conditioning system.
'97 modol:
Wire side of lemale terminals
PCM CONNECTOR C (31PI
ACS IBLU/RED)
PCM CONNECTOR A (:TIPI
(cont'd)
1 1-1 55
Chock for a shorl in thc wiro(ACS linol:1. Turn the ignition switch OFF.2. Disconnect the A/C pressure
switch 2Pconneclor.3. Turn the ignition switch ON (ll).,1. [Ieasu re voltage betweenPCM connector terminals C5
and A9.
Check for . .hon in the wire IAGSlinel:1. Turn the ignition switch OFF.2. Disconnect PCM connector C(31P).
3. Check for continuity betweenbody ground and PCM con-nector torminal C5.
Reoaii short in tho wire b€twoenrh6 PCM (Csl and the A/C pres-
3urc 3witch.
- Subcdtrte a known{ood PCMand recheck. lf pr6actibed volt-age is now av{ilable, roplacethe origind PCM,- Soe the eir conditionor in3p€c-lion lsee soction 221.
Check tor an opon in the wite(ACC lino):1. TLrrn the ignition switch OFF.2. Roconnect the A/C pressure
switch 2P connector.3. Turn the ignition switch ON (ll).
4. Momenta rily connect PCMconnector terminals A9 and417 with a iumper wire sev'eraltimes,
Wire side of female terminals
JUMPER WIRE
(To page 11-156)Wire side oI Iemale terminals
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