turn signal ACURA INTEGRA 1998 Service Repair Manual
[x] Cancel search | Manufacturer: ACURA, Model Year: 1998, Model line: INTEGRA, Model: ACURA INTEGRA 1998Pages: 1680, PDF Size: 53.14 MB
Page 241 of 1680
ECM Data
By connecting the OBD ll scan tool or the Honda PGM Tester to the 16P data link connector (DLC), various data can beretrieved from the EcM The items risted in the tabre berow conform to the sAE recommended practice.The Honda PGM Tester also reads data beyond that recommended bv SAE.understanding this data wirl herp to rind the causes of intermiftent fairures or engine probrems.
NOTE:
' The "operatlng values" given below are approximate values and may be different depending on the environment andthe individual car.' Unless noted otherwise, "at idle speed" means idling with the engiFe completely warmed up, transmissron in park orneutral and the A,/C and all accessories turned off.
DataDescriptionOperating ValueFreeze Data
Diagnostic
Trouble Code(DTC)
lf the ECM detects a problem, it will store tt as a cocteconsisting ot one letter and four numbers.Depending on the problem, an SAE-defined code{Poxxx) or a Honda-defined code (plxxx) will beoutput to the lester.
lf no problem is detected,
there is no output.
YES
Engine SpeedThe ECM computes engine speed from the signalssent from the Crankshaft Position sensor.This data is used for determining the I|me andamount of fuel injection.
Nearly the same as
tachometer indication at
idle speed:
81881,818C1 engines:
750 t 50 rpm
818C5 engine:
800 1 50 rpm
YES
Vehicle SpeedThe ECM converts pulse signals trom the VehicleSpeed Sensor (VSS) into speed data.
Nearly the same as
speedometer indicationYES
Manitold
Absolute
Pressure {MAP)
The absolute pressure created in the intake manifoldby engine load and speed.With engine stopped:
Nearly the same as atmo
spheric pressure. At idle
speed:
24 - 37 kPa (180 - 280
mmHg,7.1 1'1.0 inHg)
YES
Engine Coolant
Temperature
(ECT)
The ECT sensor converts coolant temperature intovoltage and signals the ECM. The sensor is a thermis-tor whose internal resistance changes with coolanttemperature. The ECM uses the voltage signals fromlhe ECT sensor to determine the amount of iniectedfuel.
With cold engine:
Same as ambient temper
ature and IAT
With engine warmed up:
approx. 176 - 200'F
{80 - 93.C)
, YES
Heated Oxygen
Sensor (HO2S)
{sensor 1)(sensor 2)
The Heated Oxygen Sensor detects the oxygen con-tent in the exhaust gas and sends voltage signals tothe ECM. Based on these signals,lhe ECM controlsthe airlfuel ratio. When the oxygen content is high{that is, when the ratio is leaner than the stoichiomericratio), the voltage signal is lower. When the oxygencontent is low (that is, when the ratio is richer thanthe stoichiomeric ratio), the voltage signal is higher.
0.0 - 1.25 V
At idle speed:
abour 0.'1 - 0.9 V(sensor I )NO(sensor 1)
(conl'd)
11-37
Page 243 of 1680
Engine Control Module Terminal Arrangement
ECM CONNECTOR A I32P}
ECM CONNECTOR A I32PI
*1: USA*2:818C1 engine*3:A,/T*4: 818C1, 818C5 engines
female terminals
NOTEr Standard battery voltageis 12 V.
{cont'di
LG22A
TerminalWireTerminal nameDescriptionSignal
YELlNJ4 (No. 4 FUEL INJECTOR)Drives No. 4 fuel iniector.With engine running: pulses2BLUlNJ3 (No.3 FUEL INJECTOR)Drives No. 3 fuel injector.
3REDlNJ2 (No.2 FUEL INJECTOB)Drives No.2 fuel injector.
BRNlNJl (No. 1 FUEL INJECTOR)Drives No. l Iuel iniector.
5GRN/REDS 02SHTC (SECONDARY
HEATED OXYGEN SENSORHEATER CONTROL)
Drives secondary heated oxygensensor heater,With ignition switch ON (ll)i battery volrageWith fully warmed up engine runningiduty controlled
6ORN/BLKP O2SHTC {PRIMARY HEAIEDOXYGEN SENSOB HEAIERCONTFOL)
Draves primary heated oxygensensor heater,With ignition swirch ON (ll): battery voltageWith lully warmed up engine running:duty controlled
84G RNI/ELVTS (VTEC
SOLENOID VALVE)Drives VTEC solenoid valve.With engine at low rpm: 0 VWith engine at high rpm: battery voltageIBRN/BLKLG1 (LOGIC GROUND)Ground for the ECM control circuit.Less than 1.0 V at alltimes10BLKPGl (POWER GROUND)Ground for the EC[, power circuit.Less than 1.0 V at all times't'lYEUBLKIGPl {POWER SOURCE)Power source for the ECMcontrolcircuit.With ignition switch ON 1ll): battery voltageWith ignition switch OFF| 0 V
12BLI(8LUIACV(IDLE AIR CONTROL VALVE}Drives IACV.With engine running: about 6 V 10 V(depending on engine speed)
REDPCS (EVAP PURGE CONTROLSOLENOID VALVE)Drives EVAP purge controlsolenoid valve.Wilh engane running, engine coolant above154"F (68'C): duty controlled
GRN/BLUFLR (FUEL PUMP RELAY)Drives fuel pump relay.0 V for two seconds after turning ignitionswitch ON (ll), then battery voltage
17B LVBEDACC (fuC CLUTCH RELAY)Drives A,/C clulch relay.With compressor ON: 0 VWith compressor OFFt baftery voltage
18GRN/ORNMIL (I\4ALFUNCTION
INDICATOR LAMPiDrives MlL.With MIL turned ON:0 VWjth MIL turned OFF: battery vottage
19*,WHT/GRNALTC (ALTERNATOR
CONTROL)Sends alternator control signal,With fully warmed up engine runninglbattery voltageDuring driving with small electrical load: 0 V
20YEUGRNICM (IGNITION CONTROLMODULE)Sends ignition pulse.With ignition switch ON (ll): battery voltageWith engine running: about'10 V(depending on engine speed)22BRN/BLKLG2 (LOGIC GROUND)Ground forthe ECM controlcifcuit.Less than 1.0 V at all times8LKPG2 (POWEfl GROUND)Ground for the ECM power circuit.Less than 1.0 V at all times
24YEUELKIGP2 (POWER SOURCE)Power source for the ECMcontrolcircuit,With ignition switch ON {lli: battery voltageWith ignition switch OFF: 0 V
25*3WHT/BLKVREF (REFERENCE VOLTAGE)Provides reference voltage toother control units,With ignition swirch ON (ll): about 5 VWath ignition switch OFF: 0 V
26. 'PNK/8LU
IAB SOL (INTAKE AIR BYPASSCONTROL SOLENOID VALVE)Drives IAB conlrol solenoidWith engrne running, engrae speed betow5,750 rpm: battery voltageWith engine running, engine speed above5,750 rpm: 0 V
27* IGRNFANC (BADIATOR FANCONTROL)Drives radiator fan relay.With radiator {an running: 0 VWith radiator Ian stopped: battery voltage
2ABLU2WBS (EVAP BYPASSSOLENOID VALVE)Drives EVAP bypass solenoidWith ignition switch ON (ll): battery vottage
29LT GRNVSV (EVAP CONlROLCANISTER VENT SHUT VAVLE)Drives EVAP control canister ventshut valve.Wilh ignilion switch ON lll): banery votrasc
1 1-39
Page 245 of 1680
ECM CONNECTOR D (16P}
Wire side of female terminals
ECM CONNECTOR D (16P1NOTE| Standard battery voltage is 12 V.
TerminalnumberWirecolorT6rminal nameDoscriptionSignal
1RED/BLKTPS (THROTTLE POSITIONSENSOR)Detects TP sensor s;gnal.With throttle fully open: about 4.5 VWith throttle fully closed: about 0.5 V
2REDAr'r'HTECT (ENGINE COOLANTTEMPERATUBE SENSOB}Detects ECT sensor signal.With ignition switch ON (ll)r about0.1 - 4.8 V (depending on engine coolanttemperalure)
3WHT//ELMAP {MANIFOLD AESOLUTEPBESSURE SENSOR)Detects MAP sensor signal.With ignition switch ON (ll)iabout 3 VAt idle: about 1.0 V {depending on enginespeeol
4YELA/VHTvccl{SENSOR VOLTAGE)Power source for MAP sensor,With ignition switch ON (ll): about 5 V
5GRNAVHTBKSW (BRAKE SWITCH)Detects brake switch signal.With brake pedal released: 0 VWith brake pedal depressed: batteryvoltage
6*!RED/BLUKS (KNOCK SENSOR}Detects KS signal.With engine running: pulses
lPHO2S (PRIMARY HEATEDOXYGEN GENSOR)Detects primary oxygen sensorsignal.With throttle fully opened, fully warmed upengine: above 0.6 VWith throttle quickly closed: below 0.4 V
8RED/VEL
IAT (INTAKE AIRTEMPERATURE SENSOR)Detects IAT sensor signal.With ignition switch ON {ll): about0.1 - 4.8 V (depending on intake airtemperature)
10YEL/BLUvcc2(SENSOB VOLTAGE)Provides sensor voltage,With ignition switch ON (ll): about 5 VWith ignition switch OFF: 0 V
1lGRN/8LUSG2 (SENSOR GROUND}Sensor ground.Less than 1.0 V at all times.
GFNA/VHT(SENSOR GROUND}Ground tor MAP sensor.Less than 1.0 V at all times.
OBN/BLUSHO2S GND (SECONDARY
HEATED OXYGEN SENSORGROUND)
Ground for secondary heatedoxygen sensor,Less than 1.0 V at alltimes.
148LU/REDSH02S (SECONDARY
HEATED OXYGEN SENSOR}Detects secondary oxygensensor srgnal.With throttle fully opened. fully warmed upengine: above 0,6 VWith throttle quickly closed: below 0.4 V
LT GRNPTANK (FUEL TANK PRESSURE SENSOR)Detects fueltank pressure sensor.With luel fill cap opened: about 2-5 V
GRN/RED
EL (ELOiDetects ELD signal.With parking lights turned on at idle: about2.5 -3.5 VWith low beam headlights turned on at idle:about 1.5 - 2.5 V*1:USA*2: 818C1 engine"3:A"/T*4: B18C'1, 818C5 engines
11-41
Page 252 of 1680
PGM-FI System
System Description
ENGINE CONTROL MODULE (ECM)OUTPUTS
*1: USA*2: 818C1 engine*3: A,/T*4: 818C1, 818C5 engines
PGM-FI Sy3tem
The PGM-Fl system on this model is a sequential multiport fuel injection system.
Fuel lniector Timing and Duration
The ECM contains memories for the basic discharge durations at various engine speeds and manifold pressures. The
basic discharge duration, after being read out from the memory. is further modified by signals sent from various sensors
to obtain the final discharge duration.
ldle Air Control
ldle Ai. Control Valve (lAC Valve)
When the engine is cold, the Ay'C compressor is on. the transmission is in gear (Ay'T only)the brake pedal is depressed, the
P/S load is high, or the alternator is charging, the ECM controls current to the IAC Valve to maintain correct idle speed.
lgnition Timing Control
. The ECM contains memories for basic ignition timing atvarious engine speeds and manifold pressures, lgnitiontiming
is also adjusted for engine coolant temperature.
. AKnockControl System isadoptedwhich sets the ideal ignition timing for the octane n um ber of gasoline used*r,
Other Control Functions
L Starting Control
When the engine is started, the ECM provides a rich mi{ure by increasing fuel injector duration.
2. Fuel PumD Control
. When the ignition switch is initially turned on, the ECM supplies ground to the PGM-FI main relay that supplies
current to the fuel pump for two seconds to pressurize the fuel system.
. When the engine is running, the ECM supplies ground to the PGM-FI main relay that supplies current to the fuel
DUmO.
. When the engine is not running and the ignition is on. the ECM cuts ground to the PGM-FI main relay which cuts
current to the fuel oumo.
INPUTS
TDc/CKP/CYP Sensor
CKF Sensor
MAP Sensor
ECT Sensor
IAT Sensor
TP Sensor
HO2S
VSS
BARO Sensor
ELD*1
Starter Signal
ALT FR Signal
Air Conditioning Signal
A,/T Gear Position Signal*3
Battery Voltage (lGN.1)
Brake Switch Signal
PSP Switch Signal*'
Knock Sensor*1
VTEC Pressure Switch*4
Fuel Tank Prssure Sensor
Fuel InjectorTiming and Duration
Electronic ldle Control
Other Control Functions
lgnition Timing Control
ECM Back-uD Functions
Fuel-lnjectors
PGM-Fl Main Relay (Fuel Pump)
MIL
IAC Valve
A,/C Compressor Clutch Relay
Radiator Fan Belay*1
Condenser Fan Relay
ALT*1
rcM
EVAP Purge Control Solenoid
Valve
H02S Heater
VTEC Solenoid Valve*'
IAB Control Solenoid Valve*,
EVAP Bypass Solenoid Valve
EVAP Control Canister Vent
Shut Valve
11-48
Page 253 of 1680
3.Fuel Cut-off Control
. Du ring dece leration with the th rottle va lve closed, cu rrent to the fuel injectors is cutoffto improvefuel economyat
speeds over following rpm:. B'1881 engine: 970 rpm {Canada model: 1.050 rpm). B18C1 engine:970 rpm {Canada model: 1.050 rpm). 818C5 engine: 1,300 rpm (Canada model: 1,400 rpm)
. Fuel cut-off action also takes place when engine speed exceeds 7,000 rpm (B'1881 engine), 8.100 rpm (818C1
engine) or 8,600 rpm (818C5 engine), regardless ol the position of the thronle valve, to protect the engine from
over-revving.
A,,/C ComDressor Clutch Relav
When the ECM receives a demand for cooling from the air conditioning system, it delays the compressor from being
energized, and enriches the mixture to assure smooth transition to the A,/C mode.
Evaporative Emission (EVAP) Purge Control Solenoid Valve
When the engine coolanl temperature is above '154'F (68'C) and the air conditioner on. the ECM controls the EVAPpurge control solenoid valve which controls vacuum to the EVAP purge control canister.
Intake Air Eypass (lAB) Control Solenoid Valve*a
When the engine rpm is below 5,750 rpm, rhe IAB control solenoid valve is activated by a signal from the ECM, intake
air flows through the long intake path, then high torque is delivered. At speeds higher than 5,750 rpm, the solenoidvalve is deactivated by the ECM, and intake air flows through the short intake path in order to reduce the resistance in
airflow.
Sell-diagnosis Function lMalfunction Indicator Lamp {MlL)lWhen an abnormality occurs in a signal from a sensor, the ECM supplies ground for the MIL and stores the code in
erasable memory. When the ignition is initially turned on, the ECM supplies ground for the N4lL tor two seconds to
check the MIL bulb condition.
Two Driving Cycle Detection Method
To prevent false indications, the Two Driving Cycle Detection Method is used for the HO2S, fuel metering-related, idle
control system, ECT sensor, TWC and EVAP control system and other self-diagnostic functions, When an abnormality
occurs, the ECM stores it in its memory. When the same abnormality recurs after the ignition switch is turned OFFand ON (ll)again, the ECM informs the driver by lighting the MlL.
However, to ease troubleshooting, this function is cancelled when you shon the service check connector. The MIL will
then blink immediately when an abnormality occurs.
4.
5.
6.
3.
4.
ECM Fail-safe/8ack.up F0nctions
1. Fail-sate Function
When an abnormality occurs in a signal from a sensor, the ECM ignores that signal and assumes a pre-programmed
value for that sensor that allows the enqine to continue to run.
2. Back-uo Function
When an abnormality occurs in the ECM itself, the fuel injectors are controlled by a back-up circuit independent of the
system in order to permit minimal driving.
11-49
Page 258 of 1680
J
i
'ilPGM-FI System
Manifold Absolute Pressure (MAPI Sensor
The scan tool indicates Diagnostic Trouble Code (DTC) P0107r A low voltage (high vacuum) problem in the
N4anifold Absolute Pressure (MAP) sensor.
The MAP sensor converts manifold absolute pressure into electrical signals and inputs the ECM.
OUTPUTVOLTAGE
(vt3.5
2.5
2.O
1.5
1.0
0.5
0lin.HglGAUGEREADING(mmHgl
MAP SENSOR 3P CONNECTOR IC114I
vccrIYEL/REDI
i
Ii
{
il
The MIL haa baen raportGd on.DTC P0107 is storcd,
Problem ve.ification:L Turn the ignition switch ON (ll).
2. Check th€ MAP with the scantool.
Intermittent tailulo. systam i! OKat thk lime. Chock tor pooa con-noctions or loosa wir.3 al C114{MAP s€n3orl dnd ECM.
ls approx.0 kPa (0 mmHg.0 in.Hg)or 2.8 V indicated?
Chcck lor an opan or 3hoJt in thoMAP 3on!or:1. Turn the ignition switch OFF.2, Disconn6ct th6 MAP sensor3P conn6ctor.3. Turn lhe ignition switch ON (lll.
4. Ch€ck the MAP with the scantool.
ls approx.0 kPa (0 mmHg,0 in.Hg)or 2.8 V indicated?
Ch6ck for .n op.n in wiro IVCCIlin.l:Measure vollage betwe€n theMAP sensor 3P conn€ctor termi'nals No. l and No.2,
R.pair op.n in thc wile lrotweenECM {Dll and MAP sensoi.ls there approx.5 V?
(To page 11-55)
Wire side of female terminals
Page 267 of 1680
The scan tool indicates Diagnostic Trouble Code (DTC) P0122: A low voltage problem in the Throttle Position{TP) sensor circuil.
The TP Sensor is a potentiometer. lt is connected to the throttle valve shaft. As the throttle position changes, the throttleposition sensor varies the voltage signalto the ECM.
ARUSHHOI.DER
BRUSH 5
FULLTHROTTLE
TP SENSOR CONNECTOR IC115)
Wire side of temale terminals
ECM CONNECTOR D {16P)
(GRN/BLUI
Wire side ot female terminals
sG2 / -\
fr rrr r 'tr\
- 1 2 3)
|{- f- /
| _-,/tlI /6 I TPS-\j/
Terminalside of maletermrnats(To page 11-64)
The MIL has be€n reDort€d on.DTC P0122 is stor€d.
Problem veritication:1. Start the engine. Hold theengine at 3,000 rpm with noload (in Park or neutral) untilthe radiator fan comes on, thenturn the ignition switch OFF.2. Turn the ignition switch ON (ll).
3. Check the throttle positionwith the scan tool.
ls there approx. 10% whenthe throttle is fully closedand approx.90o/o when thethrottle is fully opened?
lntermittenl tailure, system is OKat this time. Check tor poor con-nections or loose wires at Cl15{TP s€nsor) end ECM.
Check lor an open in ihe wire(VCC2line):
1. Turn the ignition switch OFF.2. Disconnect the TP sensor con,nector,3. Turn the ignition switch ON (ll).4. Measure voltage betweenTP sensor connector terminalsNo. l and No. 3.
ls there approx. 5 V7
Check fo. an open in wire IVCC2line):lleasure voltage between ECMconnector terminals D10 and D11.
R.p.ir opon in tho wire betwoenECM {D101 and TP sen3or.ls there approx. 5 V?
Substitute a known-good ECMand recheck. lf pr6sc.ibed volt-age ia now available, replaco theoriginalECM.
Check for an open or 3hort in TP3ensor:1. Turn the ignition switch OFF.2. Measure resistance betweenTP sensor terminals No. '1 andNo.2 with the throttle fullyctoseo,
OUTPUT VOLTAGE {V)
4
RESISTOR3
2
TERMINAL
I
o
THROTTLEOPEI{INGBUS}IINGIDLE
sG2{GRN/BLK)vcc2IYEL/BLU}
vcc2{YEL/BI
l\e
4E
i2iRN,
. llLI5
6/101t 12
t515
(cont'd)
Page 287 of 1680
t@
tFffi6l
F136il
l-P1362l
Fi3BTl
tFE82-l
Crankshaft Position/Top Dead Center/Cylinder Position (CKP/TDC/CYPI Sensor
The scan tool indicates Diagnostic Trouble Code {DTC) P0335: A malfunction in the Crankshaft Position (CKP)
sensor circuit.
The scan tool indicates Diagnostic Trouble Code (DTC) P0336: A range/performance problem in the CrankshaftPosition (CKP) sensor circuit.
The scan tool indicates Djagnostic Trouble Code (DTC) Pl361: Intermittent interruption in the Top Dead Center(TDC) sensor circuit.
The scan tool indicates Diagnostic Trouble Code (DTC) P1362: No signal in the Top Dead Center (TDC) sensorcircuit.
The scan tool indicates Diagnostic Trouble Code (DTC) P1381: Intermittent interruption in the Cylinder Position(CYP) sensor circuit.
The scan tool indicates Diagnostic Trouble Code (DTC) P]382: No signal in the Cylinder Position (CYP) sensorcircuit.
D€scription
The CKP Sensor determines timing for fuel injection and ignition of each cylinder and also detects engine speed. The TDCSensor determines ignition timing at stan-up (cranking) and when crank angle is abnormal. The Cyp Sensor detects theposition of No. 1 cylinder for sequential fuel injection to each cylinder.
NOTE: ll DTC P1359 is stored at the same time as DTC P0335, P0336, Pl361, P1362, P1381 and/or P1382. troubleshoot DTCP1359 first, then troubleshoot those DTCS.
Problcm va.itic.lion:'1. Do the ECM Reset Procedure.2. Stan the engine.
- Th. MIL ha3 bacn r.oort.d on.- olc P0335, P0336, P1361.P1362, P1381 and/o. P1382 erottorad.
Intormittcnt tailurc, rystem is OKat this lima. Checl tor poor con-naclions or loose wire3 at C109{CKP/lDC/CYP Scn30rl rnd €CM.
ls DTC P0335, P0336, P1361, P1362.P1381 and/or P'l382 indicared?
Chcck for .n open in thc TDC/CYP ,.n3or:L Turn the ignition switch OFF.2. Disconnect the CKP/TDC/CYP
3, Measure aesistance betweenthe terminals oI the indicatedsensor {see table).
Rcplaca tho distributor hou3ingscnsor {soa soction 231,ls rhere 0.5 - 1.0 kO?
TOC P (GRN}
Termanal side of male terminals
CYP P {YELI
CYPM IBLK)
SENSOnoTcSENSORTEEMINALECMTEflMINALCOLOR
CKPP0335c2BLU
P0336c12BLU/YEL {WHTI
TDCP13613G8N
P13627c13WHT/8LU {BEO)
CYPP13814c4YEI
P1382ac14WHT (BLK)
I ): ENGINE WIRE HARNESS SIDE
(To page 11-84)
-83
Page 294 of 1680
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
Page 299 of 1680
JP1681 | The scan tool indicates Diagnostic Trouble Code (DTC) P1681: A low voltage problem in the A/T Fl signal A
circuit.
P1682 | The scan tool indicates Diagnostic Trouble Code {DTC) Pl682: A high voltage problem in the A//T Fl signal A
circuit.
]TtOgOl fh" scan tool indicates Diagnostic Trouble Code (DTC) P1686: A low voltage problem in the A"/T Fl signal B
ctrcutt.
lFt Ogt-l fh" scan tool indicates Diagnostic Trouble Code (DTC) P1687: A high voltage problem in the A"/T Fl signal B
crrcurt.
ECM CONNECTOR C {31PI
IGRN/BLU)
Wire side of female terminals
TCM CONNECTOR {22P) {C419}Wire side of female terminals
2!a5't0
tl1213 tatat6It1a19 ,/
AFSB I I AFSA
{GRYI T- _IIGRN
@)o
2311to21 ;'15 15 17 13 13
E./ zl za
G-\
AFSIGR
\-
a
AFlGl
I
sBl
L]
r@!I AFSA
| {GRN/lRt ltl
iFSGRIA[/BLUt
12 3 a 5 6 7 89
tz /'tt //t't /ts zo
to ,/
DTC P1681, P1682, P1686 end/or P'1687 are stored.
Problem verificetion:1. Do the ECM Reset Procedure.2. orive the car for several milesso that the transmissionupshifts and downshifts severarlrmes.
Intormittent lailure. system is OKat thi3 tim€. Check tor ooo. con-nections or loo3o wir6s al C419{TCM} .nd ECM.
ls DTC P1681, P1682, Pl686and/or P1687 indicated?
Check tor a short in th6 wires{AFSA, AFSB linel:1. Turn the ignition switch OFF.2, Disconnect the 22P connectorfrom the TCM.3. Disconnect the ECM conn6c-tor C (31P).
4. Check for continuity betweenbody ground and ECM con-nector terminal C28 (C27)*.
Rcoair 3hort in tho wiros betweenECM lC28 or C27*l rnd TCM.ls there continuity?
Check fo. an open in the wiresIAFSA, AFSB lines):Check for continuity between ECMconnector terminal C28 (C27)* andTCM 22P connector terminal No. 7(No.6i*.
Repai. opsn in the wiros bdtweenECM lC28 or C27'l and TCM.
Subsiiiutg a known-good ECMend r6ch€ck. lf 3ymptom/indica-tion goes away, repl.c6 the origi-nal ECM.
":DTC P1686 or Pl687 (NT Fl sisnal 8l
1 1-95