OBD port MITSUBISHI DIAMANTE 1900 Repair Manual

.
4-8 DRIVEABILITYAND EMISSIONS CONTROLS
93154g17 Fig. 33 PCM mounting location-Mirage
Mirage and 1999-00 Galant
) See Figure 33
*The Powertrain Control Module (PCM) is
located above the passenger side kickpanel.
1. Disconnect the negative battery cable.
2. Remove the @love box, right side kickpanel
and lower panel assemblies.
3. Unplug the connectors and remove fasteners.
Remove the PCM.
4. Installation is the reverse of the removal proce-
dure.
1994-98 Galant
+ See Figure 34
1, Disconnect negative battery cable.
2. Remove both center console side panels.
3. Unplug the wiring connector and remove the
mounting hardware. Slide the PCM out the side.
4. installation is the reverse of the removal proce-
dure.
Diamante and 1990-93 Galant
) See Figures 35 and 38
*The Powertrain Control Module (PCM) is
located behind the glove box assembly.
1, If equipped, disarm the air bag system
2. Remove the passenger side lower instrument
panel and shower duct.
3. Remove the glove box striker, glove box, glove
box outer casing and the screw below the assembly.
4. Unplug wiring connector and remove mount-
ing hardware. Slide out the PCM.
To install: 5. Install the PCM with the mounting hardware.
6. Attach the wire connector.
7. Install the glove box striker, the glove box, the
glove box casing and the screw below the assembly.
Q3154g15 Fig. 35 PCM mounting location-1990-93
Galant
93154g16 Fig. 38 PCM mounting location-Diamante
8. Install the passenger side lower instrument
panel and the shower duct.
9. Reconnect the negative battery cable
OPERATION
The Oxygen (02) sensor is a device which pro-
duces an electrical voltage when exposed to the oxy-
gen present in the exhaust gases. The sensor is
mounted in the exhaust system, usually in the mani-
fold or a boss located on the down pipe before the
catalyst. The oxygen sensors used on some models
are electrically heated internally for faster switching
when the engine is started cold. The oxygen sensor
produces a voltage within 0 and 1 volt. When there is
a large amount of oxygen present (lean mixture), the
sensor produces a low voltage (less than 0.4~). When
there is a lesser amount present (rich mixture) it pro-
duces a higher voltage (0.6-I .Ov). The stoichiometric
or correct fuel to air ratio will read between 0.4 and
0.6~. By monitoring the oxygen content and convert-
ing it to electrical voltage, the sensor acts as a rich-
lean switch. The voltage is transmitted to the PCM.
Some models have two sensors, one before the
catalyst and one after. This is done for a catalyst eff i-
ciency monitor that is a part of the OBD-II engine
controls. The one before the catalyst measures the
exhaust emissions right out of the engine, and sends
the signal to the PCM about the state of the mixture
as previously talked about. The second sensor re-
ports the difference in the emissions after the exhaust
gases have gone through the catalyst. This sensor re-
ports to the PCM the amount of emissions reduction
the catalyst is performing.
The oxygen sensor will not work until a predeter-
mined temperature is reached, until this time the
PCM is running in what as known as OPEN LOOP
operation. OPEN LOOP means that the PCM has not
yet begun to correct the air-to-fuel ratio by reading the oxygen sensor. After the engine comes to operat-
ing temperature, the PCM will monitor the oxygen
sensor and correct the air/fuel ratio from the sensor’s
readings. This is what is known as CLOSED LOOP
operation.
A Heated Oxygen Sensor (H02S) has a heating el-
ement that keeps the sensor at proper operatmg tem-
perature during all operating modes. Maintaining
correct sensor temperature at all times allows the
system to enter into CLOSED LOOP operation
sooner.
In CLOSED LOOP operation, the PCM monitors
the sensor input (along with other inputs) and adjusts
the injector pulse width accordingly. During OPEN
LOOP operation, the PCM ignores the sensor input
and adjusts the injector pulse to a preprogrammed
value based on other inputs.
TESTING
# See Figure 37
93154p36 Fig. 37 The HD2S can be monitored with an
appropriate and Data-stream capable scan
tool
Do not pierce the wires when testing this
sensor; this can lead to wiring harness dam-
age. Backprobe the connector to properly
read the voltage of the HD2S.
1. Disconnect the H02S.
2. Measure the resistance between PWR and
GND terminals of the sensor. Resistance should be
approximately 6 ohms at 68°F (20°C) If resistance is
not within specification, the sensor’s heater element
is faulty.
3. With the H02S connected and engine running,
measure the voltage with a Digital Volt-Ohmmeter
(DVOM) between terminals
HD2S and SIG RTN (GND) of the oxygen sensor connector. Voltage
should fluctuate between 0.01-l .O volts. If voltage
fluctuation is slow or voltage is not within specifica-
tion, the sensor may be faulty.
REMOVAL &INSTALLATION
) See Figures 38, 39, 40, 41, and 42
1. Disconnect the negative battery cable
2. Raise and support the vehicle safely.

4-28 DRIVEABILITYAND EMISSIONS CONTROLS
Fig. 88 Plug the scan tool into the DLC un-
Fig. 89 Follow the directions on the scan
der the driver’s side of the instrument panel
tool screen to retrieve the DTC’s 3. Locate the Diagnostic Link Connector (DLC),
which is usually under the left-hand side of the in-
strument panel.
4. Start the engine and drive the vehicle until the
transaxle goes into the failsafe mode.
5. Park the vehicle, but do not turn the ignition
OFF. Allow it to idle.
6. Attach a voltmeter (analog or digital) to the test
terminals on the Diagnostic Link Connector (DLC).
The negative lead should be attached to terminal 4
and the positive lead to terminal 1.
7. Observe the voltmeter and count the flashes
(or arm sweeps if using an analog voltmeter); note
the applicable codes.
- 8. After all of the DTC(s) have been retrieved, fix
the applicable problems, clear the codes, drive the
vehicle, and perform the retrieval procedure again to
ensure that all of the codes are gone.
WITHASCANTOOL
Control module reset procedures are a very im-
portant part of OBD II System diaqnostics.
This step should be done at the end of any fault
code repair and at the end of any driveability repair.
Clearing codes can be performed by any of the
Fig. 90 in this case, we would choor- A ’ ma*-. . . * .
Trouble Codes to retrieve the DTC’s
-.- -
A mere mar
. . methods below: l Clear the control module memory with the
se l-
I I ng. vi me rtim In mts venicie contains no Generic Scan Tool (GST) l DTC’S Clear the control module memory with the ve-
L’-‘m iufacturer’s specific tester
The Federal government decided that it was time
to create a standard for vehicle diagnostic systems
codes for ease of servicing and to insure that certain
of the vehicle’s systems were being monitored for
emissions purposes. Since OBD II codes are stan-
dardized (they all contain one letter and four num-
bers), they are easy to decipher.
The OBD II system in the Mitsubishi models is de-
signed so that it will flash the DTC’s out on a volt-
meter (even though a scan tool is better). However,
the first two characters of the code are not used. This
is because the transaxle is a part of the powertrain, so
all transaxle related codes will begin with a P. Also, *The MIL will may also be de-activated for
some codes if the vehicle completes three
consecutive trips without a fault detected
with vehicle conditions similar to those pre-
sent during the fault.
WITHOUTASCAN TOOL
If there are still codes p
resent, either the codes
were not properly cleared f
:Are the codes identical to
those flashed out previous
I$‘), or the underlying
problem is still there (Are I
only some of the codes the
same as oreviouslv?).
since there are no overlapping numbers between SAE
and Mitsubishi codes, the second digit is also not
necessary.
The system flashes the codes o
ut ma series of
flashes in
three nmm mh nrnlll -- J.-lr-, ---.. ~.--
p corresponding to
one of the
three last diaits of the OBD II code. There-
fore, Code WJJ wuuw UC:
IIKWAJ WI III XVWI flashes, followed by five flashes, then by three
flashes. Each group of flashes is se
pause. All of the flashes are of the (
witi the or$, nvrontinn hoinn mm sented by z
long flash,
(shorted Tt SWIWI LIIW. rparated by a brief
;ame duration,
88, “rw”I.‘L’“‘I uv,,,y LUI”.
Zero is repre-
1 long flash. Therefore, seven flashes, one
two flashes would indicate a PO702 code
3 nnmn^r ,.:*....:I I r
SCANTOOLCODES
. YYY” I ‘I” I cuI”I”.J PO100 Mass or Volume Air Flow Circuit Malfunc-
Lb
non
PO101 Mass orVolume Air Flow Circuit
Range/Performance Problem
PO102 Mass or Volume Air Flow Circuit Low In-
Put
.
To retrieve the codes, perform the following: PO103 Mass or Volume Air Flow Circuit High In-
i Put
1. Perform the preliminary inspection, located PO104 Mass or Volume Air Flow Circuit Intermit-
-;
Vehicle speed es446e35 Fig. 92 For OBO ii code retrieval without us-
ing a scan tool on Mitsubishi models, con-
nect the DVOM and jumper wire as shown
In 1996, all Mitsubishi switched from an arbitrary
code listing and format, to the federally regulated On
Board Diagnostics 2nd Generation (OBD II) code sys-
tern. Normally, OBD II equipped vehicles do not have
the option of allowing the person servicing the vehi-
cle to flash the codes out with a voltmeter; usually a
scan tool is necessary to retrieve OBD II codes. Mit-
subishi, however, does provide this option, earlier in this section. This is very important, since a
loose or disconnected wire, or corroded connector
terminals can cause a whole slew of unrelated DTC’s
to be stored by the computer; you will waste a lot of
time performing a diagnostic “goose chase.”
2. Grab some paper and a pencil or pen to write
down the DTC’s when they are flashed out. tent
PO105 Manifold Absolute Pressure/Barometric
Pressure Circuit Malfunction
PO106 Manifold Absolute Pressure/Barometric
Pressure Circuit Range/Performance Problem
PO107 Manifold Absolute Pressure/Barometric
Pressure Circuit Low Input

l
II-24 MASTER INDEX
ADJUSTMENT 8-25
REMOVAL &INSTALLATION 8-25
HYDRAULIC CONTROL UNIT 9-25
REMOVAL & INSTALLATION 9-25
IDLE AIR CONTROLMOTOR 4-9
OPERATION 4-9
REMOVAL&INSTALLATION 4-9
TESTING 4-9
IDLESPEED 1-28
PREVENTIVEMAINTENANCE 1-28
SYSTEM INSPECTION 1-29
SYSTEMSERVlCE&REPAlR 1-28
IGNITION LOCK CYLINDER 8-29
REMOVAL & INSTALLATION 8-29
IGNITION SWITCH 8-30
REMOVAL & INSTALLATION 8-30
IGNITION COIL(s) 2-5
REMOVAL&INSTALLATION 2-6
TESTING . 2-5
IGNITION COIL 2-3
REMOVAL&INSTALLATION 2-3
TESTING 2-3
IGNITION TIMING l-25
GENERALINFORAMTION l-25
INSPECTION&ADJUSTMENT l-26
INSIDE REAR VIEW MIRROR
IO-IO
REPLACEMENT IO-IO
INSPECTION 3-55
REPLACEMENT 3-56
INSTRUMENT CLUSTER 6-17
REMOVAL&INSTALLATION 6-I;
INSTRUMENTPANEL IO-6
REMOVAL &INSTALLATION IO-6
INSTRUMENTS AND SWITCHES 6-17
INTAKE MANIFOLD 3-7
REMOVAL &INSTALLATION 3-7
INTAKEAIRTEMPERATURESENSOR 4-10
OPERATION 4-10
REMOVAL&INSTALLATION 4-11
TESTING 4-11
INTERIOR 1 O-6
JACKING I-46
. JACKING PRECAUTIONS 1-47
JUMP STARTING A DEAD BATTERY 1-44
JUMPSTARTING PRECAUTIONS l-45
JUMPSTARTING PROCEDURE l-45
KNUCKLE,HUB, AND BEARING 8-13
REMOVAL &INSTALLATION 8-13
LIGHTING 6-19
LOWER BALLJOINT 8-10
INSPECTION 8-10
REMOVAL & INSTALLATION 8-10
LOWER CONTROLARM 8-10
REMOVAL&INSTALLATION 8-10
LOWER CONTROL ARMS 8-23
REMOVAL & INSTALLATION 8-23
MACPHERSONSTRUTAND COILSPRING
8-7
OVERHAUL 8-7
REMOVAL & INSTALLATION 8-7
MAINTENANCEORREPAIR? l-2
MANIFOLDABSOLUTEPRESSURESENSOR
4-12
OPERATION 4-12
REMOVAL&INSTALLATION 4-13
TESTING 4-12
MANUAL RACK AND PINION STEERING GEAR
8-31
REMOVAL & INSTALLATION 8-31
MANUALTRANSAXLEASSEMBLY 7-2
REMOVAL & INSTALLATION. 7-2
MANUAL TRANSAXLE 7-2 MANUALTRANSAXLE l-35
DRAIN &REFILL l-36
FLUID RECOMMENDATIONS l-35
LEVEL CHECK l-35
MASSAIRFLOWSENSOR 4-11
OPERATION 4-11
REMOVAL&INSTALLATION 4-11
TESTING 4-11
MASTER CYLINDER 9-3
BRAKE PEDALADJUSTMENTS 9-4
REMOVAL & INSTALLATION 9-3
MULTI-POINT FUEL INJECTION SYSTEM (MPI) 5-3
DBD-1 TROUBLE CODES 4-26
OBD-II TROUBLE CODES 4-27
OIL PAN 3-30
REMOVAL & INSTALLATION 3-30
OIL PUMP 3-33
REMOVAL & INSTALLATION 3-33
OIL PRESSURESENDING UNIT 2-12@T
REMOVAL&INSTALLATION 2-1.2
TESTING 2-12
OUTSIDE MIRRORS IO-3
REMOVAL&INSTALLATION IO-3
OXYGENSENSOR 4-8
OPERATION 4-8
REMOVAL&INSTALLATION 4-8
TESTING 4-8
PARK/NEUTRAL POSITIONSWITCH 7-10
ADJUSTMENT 7-10
REMOVAL & INSTALLATION 7-10
PARKING BRAKE 9-20
PCVVALVE l-15
REMOVAL&INSTALLATION I-15
PINION SEAL 7-16
REMOVAL &INSTALLATION 7-16
POWER BRAKEBOOSTER 9-5
REMOVAL &INSTALLATION 9-5
POWER RACK AND PINION STEERING GEAR 8-32
REMOVAL &INSTALLATION 8-32
POWERSEATMOTOR IO-11
REMOVAL & INSTALLATION IO-11
POWER STEERING PUMP 8-34
REMOVAL & INSTALLATION 8-34
SYSTEM BLEEDING 8-36
POWER TRANSlSTOR(IGNITION MODULE) 2-7
REMOVAL&INSTALLATION 2-7
POWERSTEERING PUMP l-42
FLUID RECOMMENDATIONS l-42
LEVELCHECK l-42
POWER TRANSlSTOR(Ignition Module) 2-4
REMOVAL&INSTALLATION 2-4
PRESSURERELIEFVALVE 5-9
REMOVAL&INSTALLATION 5-9
PROPORTIONING VALVE 9-6
REMOVAL & INSTALLATION 9-6 *
RADIATOR 3-18
REMOVAL &INSTALLATION 3-18
RADIO RECEIVER/AMPLIFIER/TAPE PLAYER/CD PLAYER 6-14
READING CODES 4-26
WITHASCANTOOL 4-26
WITHOUTASCANTOOL 4-27
READING CODES 4-27
WITHASCANTOOL 4-27
WITHOUTASCANTOOL 4-27
REAR AXLE DIFFERENTIAL 7-15
REAR HALFSHAFTAND SEAL 7-15
REMOVAL&INSTALLATION 7-15
REAR MAIN SEAL 3-54
REMOVAL & INSTALLATION 3-54