
DTC P0100 MASS AIR FLOW SENSOR (MAFS)......120
Component Description ...........................................120
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................120
ECM Terminals and Reference Value .....................120
On Board Diagnosis Logic.......................................120
DTC Confirmation Procedure ..................................121
Wiring Diagram ........................................................122
Diagnostic Procedure ..............................................123
Component Inspection .............................................126
DTC P0110 INTAKE AIR TEMPERATURE
SENSOR......................................................................127
Component Description ...........................................127
On Board Diagnosis Logic.......................................127
DTC Confirmation Procedure ..................................127
Wiring Diagram ........................................................128
Diagnostic Procedure ..............................................129
Component Inspection .............................................131
DTC P0115 ENGINE COOLANT TEMPERATURE
SENSOR (ECTS) (CIRCUIT).......................................132
Component Description ...........................................132
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................132
On Board Diagnosis Logic.......................................132
DTC Confirmation Procedure ..................................133
Wiring Diagram ........................................................134
Diagnostic Procedure ..............................................135
Component Inspection .............................................136
DTC P0120 THROTTLE POSITION SENSOR...........137
Component Description ...........................................137
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................137
ECM Terminals and Reference Value .....................138
On Board Diagnosis Logic.......................................138
DTC Confirmation Procedure ..................................138
Wiring Diagram ........................................................140
Diagnostic Procedure ..............................................141
Component Inspection .............................................142
DTC P0130 HEATED OXYGEN SENSOR 1
(FRONT) (CIRCUIT).....................................................144
Component Description ...........................................144
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................144
ECM Terminals and Reference Value .....................144
On Board Diagnosis Logic.......................................145
DTC Confirmation Procedure ..................................145
Overall Function Check ...........................................146
Wiring Diagram ........................................................147
Diagnostic Procedure ..............................................148
Component Inspection .............................................149DTC P0131 HEATED OXYGEN SENSOR 1
(FRONT) (LEAN SHIFT MONITORING).....................150
Component Description ...........................................150
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................150
ECM Terminals and Reference Value .....................150
On Board Diagnosis Logic.......................................151
DTC Confirmation Procedure ..................................151
Overall Function Check ...........................................152
Diagnostic Procedure ..............................................153
Component Inspection .............................................154
DTC P0132 HEATED OXYGEN SENSOR 1
(FRONT) (RICH SHIFT MONITORING)......................156
Component Description ...........................................156
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................156
ECM Terminals and Reference Value .....................156
On Board Diagnosis Logic.......................................157
DTC Confirmation Procedure ..................................157
Overall Function Check ...........................................158
Diagnostic Procedure ..............................................159
Component Inspection .............................................160
DTC P0133 HEATED OXYGEN SENSOR 1
(FRONT) (RESPONSE MONITORING).......................162
Component Description ...........................................162
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................162
ECM Terminals and Reference Value .....................162
On Board Diagnosis Logic.......................................163
DTC Confirmation Procedure ..................................163
Overall Function Check ...........................................164
Wiring Diagram ........................................................165
Diagnostic Procedure ..............................................166
Component Inspection .............................................169
DTC P0134 HEATED OXYGEN SENSOR 1
(FRONT) (HIGH VOLTAGE)........................................170
Component Description ...........................................170
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................170
ECM Terminals and Reference Value .....................170
On Board Diagnosis Logic.......................................171
DTC Confirmation Procedure ..................................171
Wiring Diagram ........................................................172
Diagnostic Procedure ..............................................173
Component Inspection .............................................174
DTC P0135 HEATED OXYGEN SENSOR 1
(FRONT) HEATER.......................................................175
Description ...............................................................175
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................175
ECM Terminals and Reference Value .....................175
On Board Diagnosis Logic.......................................175
CONTENTS(Cont'd)
EC-2

DTC Confirmation Procedure ..................................175
Wiring Diagram ........................................................177
Diagnostic Procedure ..............................................178
Component Inspection .............................................179
DTC P0137 HEATED OXYGEN SENSOR 2(REAR)
(MIN. VOLTAGE MONITORING).................................180
Component Description ...........................................180
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................180
ECM Terminals and Reference Value .....................180
On Board Diagnosis Logic.......................................180
DTC Confirmation Procedure ..................................181
Overall Function Check ...........................................182
Wiring Diagram ........................................................183
Diagnostic Procedure ..............................................184
Component Inspection .............................................186
DTC P0138 HEATED OXYGEN SENSOR 2(REAR)
(MAX. VOLTAGE MONITORING)...............................187
Component Description ...........................................187
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................187
ECM Terminals and Reference Value .....................187
On Board Diagnosis Logic.......................................187
DTC Confirmation Procedure ..................................188
Overall Function Check ...........................................189
Wiring Diagram ........................................................190
Diagnostic Procedure ..............................................191
Component Inspection .............................................193
DTC P0139 HEATED OXYGEN SENSOR 2(REAR)
(RESPONSE MONITORING).......................................194
Component Description ...........................................194
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................194
ECM Terminals and Reference Value .....................194
On Board Diagnosis Logic.......................................194
DTC Confirmation Procedure ..................................195
Overall Function Check ...........................................196
Wiring Diagram ........................................................197
Diagnostic Procedure ..............................................198
Component Inspection .............................................200
DTC P0140 HEATED OXYGEN SENSOR 2(REAR)
(HIGH VOLTAGE)........................................................201
Component Description ...........................................201
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................201
ECM Terminals and Reference Value .....................201
On Board Diagnosis Logic.......................................201
DTC Confirmation Procedure ..................................202
Overall Function Check ...........................................202
Wiring Diagram ........................................................203
Diagnostic Procedure ..............................................204
Component Inspection .............................................205DTC P0141 HEATED OXYGEN SENSOR 2
(REAR) HEATER.........................................................207
Description ...............................................................207
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................207
ECM Terminals and Reference Value .....................207
On Board Diagnosis Logic.......................................207
DTC Confirmation Procedure ..................................208
Wiring Diagram ........................................................209
Diagnostic Procedure ..............................................210
Component Inspection ............................................. 211
DTC P0171 FUEL INJECTION SYSTEM
FUNCTION (LEAN SIDE)............................................212
On Board Diagnosis Logic.......................................212
DTC Confirmation Procedure ..................................212
Wiring Diagram ........................................................213
Diagnostic Procedure ..............................................214
DTC P0172 FUEL INJECTION SYSTEM
FUNCTION (RICH SIDE).............................................218
On Board Diagnosis Logic.......................................218
DTC Confirmation Procedure ..................................218
Wiring Diagram ........................................................220
Diagnostic Procedure ..............................................221
DTC P0300 - P0304 NO.4-1CYLINDER
MISFIRE, MULTIPLE CYLINDER MISFIRE...............224
On Board Diagnosis Logic.......................................224
DTC Confirmation Procedure ..................................224
Diagnostic Procedure ..............................................225
Component Inspection .............................................229
DTC P0325 KNOCK SENSOR (KS)...........................230
Component Description ...........................................230
ECM Terminals and Reference Value .....................230
On Board Diagnosis Logic.......................................230
DTC Confirmation Procedure ..................................230
Wiring Diagram ........................................................231
Diagnostic Procedure ..............................................232
Component Inspection .............................................233
DTC P0335 CRANKSHAFT POSITION SENSOR
(CKPS) (OBD)..............................................................234
Component Description ...........................................234
ECM Terminals and Reference Value .....................234
On Board Diagnosis Logic.......................................234
DTC Confirmation Procedure ..................................235
Wiring Diagram ........................................................236
Diagnostic Procedure ..............................................237
Component Inspection .............................................238
DTC P0340 CAMSHAFT POSITION SENSOR
(CMPS).........................................................................239
Component Description ...........................................239
ECM Terminals and Reference Value .....................239
On Board Diagnosis Logic.......................................240
DTC Confirmation Procedure ..................................240
CONTENTS(Cont'd)
EC-3

CONSULT-II Reference Value in Data Monitor
Mode ........................................................................306
ECM Terminals and Reference Value .....................306
Wiring Diagram ........................................................308
Diagnostic Procedure ..............................................309
Component Inspection .............................................310
START SIGNAL...........................................................312
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................312
ECM Terminals and Reference Value .....................312
Wiring Diagram ........................................................313
Diagnostic Procedure ..............................................314
FUEL PUMP.................................................................316
System Description ..................................................316
Component Description ...........................................316
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................316
ECM Terminals and Reference Value .....................316
Wiring Diagram ........................................................317
Diagnostic Procedure ..............................................318
Component Inspection .............................................320
POWER STEERING OIL PRESSURE SWITCH.........321
Component Description ...........................................321
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................321
ECM Terminals and Reference Value .....................321
Wiring Diagram ........................................................322Diagnostic Procedure ..............................................323
Component Inspection .............................................324
ELECTRICAL LOAD SIGNAL.....................................325
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................325
ECM Terminals and Reference Value .....................325
Wiring Diagram ........................................................326
MI & DATA LINK CONNECTORS..............................329
Wiring Diagram ........................................................329
SERVICE DATA AND SPECIFICATIONS (SDS).......330
Fuel Pressure Regulator..........................................330
Idle Speed and Ignition Timing ................................330
Ignition Coil ..............................................................330
Mass Air Flow Sensor..............................................330
Engine Coolant Temperature Sensor ......................330
Fuel Pump ...............................................................330
IACV-AAC Valve ......................................................330
Injector .....................................................................330
Throttle Position Sensor ..........................................331
Heated Oxygen Sensor 1 (Front) Heater ................331
Intake Air Temperature Sensor ................................331
EVAP Canister Purge Volume Control Valve ..........331
Heated Oxygen Sensor 1 (Rear) Heater.................331
Crankshaft Position Sensor (OBD)..........................331
CONTENTS(Cont'd)
EC-5

System ChartNCEC0013
Input (Sensor) ECM Function Output (Actuator)
ICamshaft position sensor
IMass air flow sensor
IEngine coolant temperature sensor
IHeated oxygen sensor 1 (front)
IIgnition switch
IThrottle position sensor
IPNP switch
IAir conditioner switch
IKnock sensor
ICrankshaft position sensor (OBD)*1
IBattery voltage
IPower steering oil pressure switch
IVehicle speed sensor or ABS actuator and
electric unit (control unit)
IIntake air temperature sensor
IHeated oxygen sensor 2 (rear)*2
ITCM (Transmission control module)*3
IClosed throttle position switch
IElectrical load
IRefrigerant pressure sensorFuel injection & mixture ratio control Injectors
Distributor ignition system Power transistor
Idle air control system IACV-AAC valve
Fuel pump control Fuel pump relay
Heated oxygen sensor 1 (front) monitor &
on board diagnostic systemMalfunction indicator
(On the instrument panel)
Heated oxygen sensor1&2(front & rear)
heater controlHeated oxygen sensor1&2
heater (front & rear)
EVAP canister purge flow controlEVAP canister purge volume con-
trol solenoid valve
Cooling fan control Cooling fan relay
Air conditioning cut control Air conditioner relay
*1: These sensors are not used to control the engine system. They are used only for the on board diagnosis.
*2: Under normal conditions, this sensor is not for engine control operation.
*3: The DTC related to CVT will be sent to ECM.
ENGINE AND EMISSION CONTROL OVERALL SYSTEMSR20DE
System Chart
EC-22

Idle Speed/Ignition Timing/Idle Mixture Ratio
Adjustment
NCEC0028PREPARATIONNCEC0028S01IMake sure that the following parts are in good order.
a)Battery
b)Ignition system
c)Engine oil and coolant levels
d)Fuses
e)ECM harness connector
f)Vacuum hoses
g)Air intake system
(Oil filler cap, oil level gauge, etc.)
h)Fuel pressure
i)Engine compression
j)Throttle valve
k)EVAP system
IOn models equipped with air conditioner, checks should
be carried out while the air conditioner is ªOFFº.
IWhen checking idle speed on models equipped with CVT,
ignition timing and mixture ratio, checks should be carried
out while shift lever is in ªPº or ªNº position.
IWhen measuring ªCOº percentage, insert probe more
than 40 cm (15.7 in) into tail pipe.
ITurn off headlamps, heater blower, rear window defogger.
IOn vehicles equipped with daytime running light systems,
set lighting switch to the 1st position to light only small
lamps.
IKeep front wheels pointed straight ahead.
IIf engine stops immediately after starting or idle condition
is unstable, perform the following to initialize IACV-AAC
valve:
a)Stop engine and wait 9 seconds.
b)Turn ignition ªONº and wait 1 second.
c)Turn ignition ªOFFº and wait 9 seconds.
IMake the check after the cooling fan has stopped.
BASIC SERVICE PROCEDURESR20DE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment
EC-34

FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATANCEC0031S02The ECM records the driving conditions such as fuel system status, calculated load value, engine coolant
temperature, short term fuel trim, long term fuel trim, engine speed, vehicle speed and absolute pressure
sensor at the moment a malfunction is detected.
Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data.
The data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT-II or
GST. The 1st trip freeze frame data can only be displayed on the CONSULT-II screen, not on the GST. For
details, see EC-SR-71.
Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be stored in the
ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no prior-
ity for 1st trip freeze frame data and it is updated each time a different 1st trip DTC is detected. However, once
freeze frame data (2nd trip detection/MI on) is stored in the ECM memory, 1st trip freeze frame data is no
longer stored. Remember, only one set of freeze frame data can be stored in the ECM. The ECM has the fol-
lowing priorities to update the data.
Priority Items
1Freeze frame data Misfire Ð DTC: P0300 - P0304 (0300 - 0304)
Fuel Injection System Function Ð DTC: P0171 (0171), P0172 (0172)
2 Except the above items (Includes CVT related items)
3 1st trip freeze frame data
For example, the CVT malfunction (Priority: 2) was detected and the freeze frame data was stored in the 2nd
trip. After that when the misfire (Priority: 1) is detected in another trip, the freeze frame data will be updated
from the CVT malfunction to the misfire. The 1st trip freeze frame data is updated each time a different mal-
function is detected. There is no priority for 1st trip freeze frame data. However, once freeze frame data is
stored in the ECM memory, 1st trip freeze data is no longer stored (because only one freeze frame data or
1st trip freeze frame data can be stored in the ECM). If freeze frame data is stored in the ECM memory and
freeze frame data with the same priority occurs later, the first (original) freeze frame data remains unchanged
in the ECM memory.
Both 1st trip freeze frame data and freeze frame data (along with the DTCs) are cleared when the ECM
memory is erased. Procedures for clearing the ECM memory are described in ªHOW TO ERASE EMISSION-
RELATED DIAGNOSTIC INFORMATIONº. Refer to EC-SR-56.
SYSTEM READINESS TEST (SRT) CODENCEC0031S03System Readiness Test (SRT) code is specified in Mode 1 of ISO 15031-5. It indicates whether the self-diag-
nostic tests for non-continuously monitored items have been completed or not.
Inspection/Maintenance (I/M) tests of the on board diagnostic (OBD) II system may become the legal require-
ments in some states/areas. All SRT codes must be set in this case. Unless all SRT codes are set, conduct-
ing the I/M test may not be allowed.
SRT codes are set after self-diagnosis has been performed one or more times. This occurs regardless of
whether the diagnosis is in ªOKº or ªNGº, and whether or not the diagnosis is performed in consecutive trips.
The following table lists the four SRT items (14 test items) for the ECM used in P11 models.
SRT items Self-diagnostic test items
Catalyst monitoringIThree way catalyst function P0420 (0420)
Oxygen sensor monitoringIHeated oxygen sensor 1 (front) (Circuit) P0130 (0130)
IHeated oxygen sensor 1 (front) (Lean shift monitoring) P0131 (0131)
IHeated oxygen sensor 1 (front) (Rich shift monitoring) P0132 (0132)
IHeated oxygen sensor 1 (front) (Response monitoring) P0133 (0133)
IHeated oxygen sensor 1 (front) (High voltage) P0134 (0134)
IHeated oxygen sensor 2 (rear) (Min. voltage monitoring) P0137 (0137)
IHeated oxygen sensor 2 (rear) (Max. voltage monitoring) P0138 (0138)
IHeated oxygen sensor 2 (rear) (Response monitoring) P0139 (0139)
IHeated oxygen sensor 2 (rear) (High voltage) P0140 (0140)
Oxygen sensor heater monitoringIHeated oxygen sensor 1 (front) heater P0135 (0135)
IHeated oxygen sensor 2 (rear) heater P0141 (0141)
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONSR20DE
Emission-related Diagnostic Information (Cont'd)
EC-50

SRT item Self-diagnostic test itemTest value (GST display)
Test limit Application
TID CID
HO2SHeated oxygen sensor 1
(front)09H 04H Max. X
0AH 84H Min. X
0BH 04H Max. X
0CH 04H Max. X
0DH 04H Max. X
Heated oxygen sensor 2
(rear)19H 86H Min. X
1AH 86H Min. X
1BH 06H Max. X
1CH 06H Max. X
HO2S HTRHeated oxygen sensor 1
(front) heater29H 08H Max. X
2AH 88H Min. X
Heated oxygen sensor 2
(rear) heater2DH 0AH Max. X
2EH 8AH Min. X
EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMSNCEC0031S05X: Applicable Ð: Not applicable
Items
(CONSULT-II screen terms)DTC*4
SRT codeTest value/Test
limit
(GST only)1st trip DTC*4Reference
page CONSULT-II
GST*2ECM*1
NO SELF DIAGNOSTIC
FAILURE INDICATEDP0000 0000ÐÐÐÐ
MAF SEN/CIRCUIT P0100 0100 Ð Ð X EC-SR-120
AIR TEMP SEN/CIRC *5 P0110 0110 Ð Ð X EC-SR-127
COOLANT T SEN/CIRC P0115 0115 Ð Ð X EC-SR-132
THRTL POS SEN/CIRC P0120 0120 Ð Ð X EC-SR-137
HO2S1 (B1) P0130 0130 X X X*3 EC-SR-144
HO2S1 (B1)*5 P0131 0131 X X X*3 EC-SR-150
HO2S1 (B1)*5 P0132 0132 X X X*3 EC-SR-156
HO2S1 (B1)*5 P0133 0133 X X X*3 EC-SR-162
HO2S1 (B1)*5 P0134 0134 X X X*3 EC-SR-170
HO2S1 HTR (B1)*5 P0135 0135 X X X*3 EC-SR-175
HO2S2 (B1) *5 P0137 0137 X X X*3 EC-SR-180
HO2S2 (B1) *5 P0138 0138 X X X*3 EC-SR-187
HO2S2 (B1) *5 P0139 0139 X X X*3 EC-SR-194
HO2S2 (B1) *5 P0140 0140 X X X*3 EC-SR-201
HO2S2 HTR (B1) *5 P0141 0141 X X X*3 EC-SR-207
FUEL SYS LEAN/BK1*5 P0171 0171 Ð Ð X EC-SR-212
FUEL SYS RICH/BK1 *5 P0172 0172 Ð Ð X EC-SR-218
MULTI CYL MISFIRE *5 P0300 0300 Ð Ð X EC-SR-224
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONSR20DE
Emission-related Diagnostic Information (Cont'd)
EC-54

ItemDIAGNOSTIC TEST MODE
WORK
SUP-
PORTSELF-DIAGNOS-
TIC RESULTS
D ATA
MONI-
TORD ATA
MONI-
TOR
(SPEC)ACTIVE
TESTDTC
CONFIRMATION
DTC*1FREEZE
FRAME
DATA*2SRT
STATUSDTC
WORK
SUP-
PORT
ENGINE CONTROL COMPONENT PARTS
OUT-
PUTInjectors X X X
Power transistor (Ignition timing) XX
(Ignition
signal)XXX
IACV-AAC valve X X X X X
EVAP canister purge volume con-
trol solenoid valveX XXX
Air conditioner relay X X
Fuel pump relay X X X X
Heated oxygen sensor 1 (front)
heaterXXXX
Heated oxygen sensor 2 (rear)
heaterXXXX
Cooling fan X X X X
Calculated load value X X X
X: Applicable
*1: This item includes 1st trip DTCs.
*2: This mode includes 1st trip freeze frame data or freeze frame data. The items appear on CONSULT-II screen in freeze frame data
mode only if a 1st trip DTC or DTC is detected. For details, refer to EC-SR-50.
FUNCTIONNCEC0034S03
Diagnostic test mode Function
Work supportThis mode enables a technician to adjust some devices faster and more accurately by following the
indications on the CONSULT-II unit.
Self-diagnostic resultsSelf-diagnostic results such as 1st trip DTC, DTCs and 1st trip freeze frame data or freeze frame
data can be read and erased quickly.*1
Data monitor Input/Output data in the ECM can be read.
Data monitor (spec)Input/Output specifications of the basic fuel schedule, AFM, A/F feedback control value and the
other data monitor items can be read.
Active testDiagnostic Test Mode in which CONSULT-II drives some actuators apart from the ECMs and also
shifts some parameters in a specified range.
DTC confirmation The status of system monitoring tests and the self-diagnosis status/result can be confirmed.
ECM part number ECM part numbers can be read.
*1 The following emission-related diagnostic information is cleared when the ECM memory is erased.
1) Diagnostic trouble codes
2) 1st trip diagnostic trouble codes
3) Freeze frame data
4) 1st trip freeze frame data
5) System readiness test (SRT) codes
6) Test values
7) Distance traveled while MI is activated
8) Others
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONSR20DE
CONSULT-II (Cont'd)
EC-70