Page 257 of 1680
{From page 11 52)
Chock lor a shon in lhe wi.asiVCC1. VCC2lin$l:1. Turn the ignition switch OFF-2. Disconnect the ECM connec,tor D (16P).
3. Check lor continuity betweenbody ground and ECM con-nector terminals D4 and D10individually.
- Repair short to body groundin tho wire between ECM {D4land MAP 3enso..- Rep.ir short to body groundin the wire between ECMlD10l, TP sensor and Fueltank pa6ssure sanso..
Chock lor an op€n in the wire3{lGP1.lGP2lines):1. Turn the ignition switch ON (ll).2, Measure voltage betweenbody ground and ECM connec-torterminals A'11 and A24 indi-vadually.- R6pe;r open in the wire{slbetween ECM 1A11, A24l andPGM-FI main .elay.- Check for poor connectionsor loose wi.es at the PGM-FImain relay.- Test tho PGM-FI main ral.v(see page 11-124).Check for an open in the wires(LG1, LG2line3l:1. Reconnect all sensor connec-tors.2. Reconnect the ECM connectorD (16P).
3. Turn the ignition switch ON (ll).4- M easu re voltage betweenbody ground and ECM connector terminals A9 and A22individually.
Repai. open in the wir€ls)bctween ECM {A9, A22l .ndG101 ihet had more then 1.0 V.
ls there lessthan 1.0 V?
Substitute , known-good ECMand rechock. f symptom/indica-tion goes away, roplac6 the odgi-n3l ECM.
Wire side of female terminals
ECM CONNECTOR A I32P)
a,
Wire side of female terminals
LGl
1 1-53
Page 279 of 1680
(From page 11-74)
Check tor an op6n in the wire{lGP, lGl* linel:Measure voltage between No. 3terminal and body ground.
Repair open in the wirebetween PGM-Fl mein relayand Pii.nary HO2S {Sonsor 11.Repair open in the wirebetween No. 15 ALTERNATORSP SENSOR 17.5 A) tuse in theund€r-d.sh fuse/rolav box andSecondary HO2S (S€n3or 21.
ls there battery vohage?
Check for an opon in the wh$:1. Turn the ignition switch OFF.2. Reconnect the HO2S connec-tor.3- Disconnect the ECM connectorA (32P).
4. Turn the ignition switch ON 1fl).5. Measure voltage between theECM connector terminals 46or A5* and A10.
Repair open in tha wire betw.enECM {A6 or A5rl and HO2S.ls there 0.1 V or less?
Substitute a known-good ECMand r.chcck. tf 3ymptom/indica-tion goes awey, repl.ce the odgi-nelECM.
PRIMARY HO2S {Sensor 1} CONNECTOR C113SECONDARY HO2S (Sensor 2ICONNECTOR C45tr
Wire side of female terminals
ECM CONNECTOR A I32P)
IGPlG1
so2HTC{GRN/RET
c
4tr
A, 4\'/ | PO2HTC \=/ \ltoRN/BLKt \-T--] \
PGl(BLK)
2a 1f lefil tt12't5t51? t8t92022 23
2526l2823
Wire side of temale terminals
(From page '11-74)
Check fo. a short in the wire(O2SHTC linel:1. Turn the ignition switch OFF.2. Disconnect the ECM connec-tor A (32P).
3. Check for continuity betweenthe ECM connector 46 or A5*termanai and body ground.
Rcpair short in the wire botweenECM IAG or A5*l .nd HO2S.ls there continuity?
Substituto a known-good ECMand recheck. lf symptom/indica-tion goes away, replac€ the origi-nalECM.
3 rl 15 6
15 15 17 lA
*r P0141
11-75
Page 292 of 1680
PGM-FI System
Electrical Load Detector (ELDI (USAI
The scan tool indicates Diagnostic Trouble Code (DTC) P1297: A low voltage problem in the Electrical Load
Detector (ELD) circuit.
ELD 3P CONNECTOR {C218)
Wire side of female termin€ls
Problem verification:1- Do the ECM Reset Procedure.2. Stan the engine.3. Turn on headlights.
Int€rmittont failure. swtom b OKat this time. Check tor poor con-neqtions or loose wi.es at C218IELDI and ECM-
ls DTC P1297 indicated?
Check for ao open in the wire
{lG1 linel:1. Turn the ignition and head-lights OFF.2. Disconnect the ELD 3P con-nector,3. Turn the ignition switch ON (ll).
4. Measure voltage betlveen bodyground and the ELD 3P connector te.minal No.'1.
Repair op6n in the wire baiwe€nNo. 15 ALTERNATOR SP SENSOR17.5 Al fus€ in the under-dashluse/relay box and ELD.
Chock lor short in the wire {ELline,:Measure voltage between bodyground and the ELD 3P connectorterminal No.3.
ls there approx. 5 Vl
Check for a short in the wire (EL
linel:1. Turn the ignition switch OFF.2. Disconnect the ECM connectorD (16P).
3. Check for continuity betweenbody ground and ECM con-nector terminal D16.
Sooair short in the wire betweenECM (D161 and ELD.
Substitut€ a known-9ood ECMand recheck. It symptom/indica-tion goes away, r€place the origi-nal ECM.
EL{GRN/REDI
ECM CONNECTOR D {16PI
Wire side oI Iemale tarminals
11-88
Page 300 of 1680
ldle Control System
System Description
The idle speed of the engine is controlled by the ldle Air Control (lAC) V8lve.
The valve changes the amount of air bypassing into the intake manifold in response to electric current controlled by the
ECM. When the IAC Valve is activated. the valve opens to maintain the proper idle speed.
81881 engine {B18Cl, B18C5 engines are similarl:
YELI - F.om PGM'FIBLK - MAIN RELAY
VARIOUS SENSORS
L
1 1-96
Page 307 of 1680
(From page t 1'102)
Ch6ck {or an op6n in the wireIACC linel:Mo m enta rily connect the A/Cclutch relay 4P connector termi-nal No. 4 to body ground with a,umper wire several times.
ls there a clicking noise fromthe A,/C compressor clutch?
ls there a clicking noise fromthe 4,./C compressor clutch?See air conditione. insoection{s€e section 22).
Repai. op6n in the wire betwe€ntho ECM lA17l and the A/C clutch
Check tor the oparation of theA/C:1. Start the eogine.2. Turn the blower switch ON.3. Turn the !y'C switch ON.
Check lor sn open in th6 wireIACS line):Measure voltage between ECMconnector terminals C5 and A9,
Air conditioning signal i3 OK.Repafu open in the wire betweenthe ECM {C5} and th€ A/C D.es-sure switch or A/C diode.
ls voltage less than 1.0 V?
- Substitute e known-good ECM.nd .echeck. lf 3ymptom/indi-cation goes away, rcplaco th€original ECM.- 56€ the air conditionor inspcc-tion {3eo soction 221.
UNDER HOOD FUSE/RELAYBOX 9P CONNECTOR tC216)
JUMPERWIREACC {SLK/RED)Wire side of temale- terminals
A {32P)
LGl(BRN/BLKI
ECM CONNECTORS
Wire side of female terminals
c (31P)
ACS{BLU/RED}
I
'1.1-103
Page 308 of 1680
This signals the ECM when the brake pedal is depressed
Inspeclion ot Brake Switch Signal.
Are the brake lights on withoutdepressing the brake pedal?
lnspect the HoRN STOP (20 Aifuse in the under-hood fuse/ relaybox,Do the brake lights come on?
Repair shori in the wire b€-
tween the brake switch and
the HoRN STOP {20 Al fuse.Replace tha HORN STOP (20 AlIus€.
Repair open in the wire be-tween the brtke switch andtho HORN STOP {20 Al tuse.
Inspect the brake switch {seesection 23).Check tor an open in the wire
{BKSW line):1- Depress the brake pedal.
2. Measure voltage between ECMconnector terminals D5 and Agwith the brake pedal depressed.
Repair open io th6 wiae batweonthe EcM lDs) rnd the brakeswitch.
Brake switch signal is OK.
ldle ControlSystem
Brake SwitchSignal
L
L
A {32P}LGl{BRN/BLX}
D {16P)
Wrre side of female terminals
I
Page 309 of 1680
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
Page 322 of 1680
The fuel supply system co
high pressure fuel pump, t
fuel pressure regulator. f
damper, and fuel delivery i
delivers pressure-regulated
cuts the luel delivery when
Fuel Supply System
System Description
consists of a fuel tank, in-tank
r, PGM-Fl main relay, fueffilter,
. fuel injectors, fuel pulsation
y and return lines. This system
ed fuel to the fuel injectors and
rn thq engine is not running.
Fuel Pressure
Relieving
Before disconnecting fuel pipes or hoses, release pres-
sure from the system by loosening the 12 mm banjo
bolt on top ol the fuel filter.
Do not smok€ while working on the tuel system,
Keep open flames or sparks away from you. work
arga.
Be sure to relieve fuel pressure while the ignition
swiich is ofl,
Make sure you have the anti theft code for the
radio, then write down the frequencies for the
radio's preset buttons.
Disconnect the battery negative cable from the bat-
tery negative terminal.
Remove the fuelfill cap.
Use a box end wrench on the 12 mm banjo bolt at
the fuel filter while holding the fuel filter with another
wrench.
Place a rag or shop towel over the '12 mm banjo
bolt.
Slowly loosen the 12 mm banjo bolt one complete
tu rn.
1 1-1 18
I
NOTE| Replace the washers whenever the 12 mm banjo
bolt is loosened or removed.
lnsDection
1. Relieve fuel pressure.
2. Remove the 12 mm banjo bolt from the fuel filter
while holding the fuel tilter with another wrench.
Attach the fuel pressure adapter bolt, 12 mm and
the special tool.
3. Stan the engine. Measure the tuel pressure with the
engine idling and the vacuum hose of the fuel pres-
sure regulator disconnected from the fuel pressure
regulator and pinched. lf the engine will not start,
turn the ignition switch ON (ll), wait for two sec-
onds, turn it off, then back on again and read the
tuel pressure.
Pressuro should be:
Bl8Bl engire:
270 - 320 kP. (2.8 - 3.3 kgl/cm' .40 - 47 psi)
818C1, 818C5 engines:
320 - 370 kPa (3.3 - 3.8 kgt/cm' . 47 - g psi)
12 mm
FUEL FILTER
