PCM INSPECTION [G6]

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Using M-MDS

Note
•  PIDs for the following parts are not available on this model. Go to the appropriate part inspection page.
―  CMP sensor
―  Main relay

1.  Connect the M-MDS to the DLC-2.

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2.  Turn the ignition switch to ON position.

3.  Measure the PID value.

•  If PID value is not within the specification, follow the instructions in “Inspection item (s)” column.
Note
•  The PID/DATA MONITOR function monitors the calculated value of the input/output signals in the PCM. Therefore, an output device malfunction is not directly indicated as a malfunction of the monitored value for the output device. If a monitored value of an output device is out of specification, inspect the monitored value of the input device related to the output control.
•  For input/output signals except those of the monitoring items, use a voltmeter to measure the PCM terminal voltage.
•  The simulation items that are used in the ENGINE CONTROL SYSTEM OPERATION INSPECTION are as follows.
―  ACCS, EVAPCP, FP, FPRC, FUELPW1, IAC, INJ 1, INJ 2

PID MONITOR Table

Monitor item (Definition)

Unit/Condition

Condition/Specification (Reference)

Inspection item (s)

PCM terminal
ACCS
(A/C relay)
On/Off
•  Ignition switch on:Off
•  A/C switch on and fan switch on at idle:On
•  The following PIDs
―  RPM
―  TP
―  ECT
―  ACSW
•  A/C relay
1J
ACSW
(A/C switch)
On/Off
•  A/C switch and fan switch on at ignition switch on: On
•  A/C switch off at ignition switch on: Off
•  A/C switch
1Q
ARPMDES
(Target engine speed)
RPM
•  Indicate the target engine speed
•  CMP sensor
—
BARO
(Barometric pressure)
Kpa
•  Below 400 m {0.25 mile} above sea level:100—103kPa {1.01—10.5 kgf/cm2}
•  DTCP1195 is indicated.
follow DTC Troubleshooting
—
V
•  Below 400 m {0.25 mile} above sea level:3.9—4.0V
BOO
(Brake switch)
On/Off
•  Brake pedal depressed:On
•  Brake pedal released:Off
•  Brake switch
1O
CPP/PNP
(Shift lever position)
Drive/Neutral
•  Neutral:Neutral
•  Other than neutral:Drive
•  Neutral switch
1V
ECT
(Engine coolant temperature)
°C
°F
•  Indicate the ECT
•  ECT sensor
2Q
V
•  Ignition switch to the ON position (after warm up):0.58 V
EVAPCP
(Purge solenoid valve duty value)
%
•  Ignition swich on:0%
•  Idle:0%
•  The following PIDs
―  IAT
―  RPM
―  ECT
―  MAF
―  TP
―  O2S11
―  VPWR
2X
FP
(Fuel pump relay)
On/Off
•  Ignition swich on:Off
•  Idle:On
•  Cranking:On
•  The following PIDs
―  RPM
•  Fuel pump relay
1H
FPRC
(PRC solenoid valve)
On/Off
•  Ignition swich on:Off
•  Idle:Off
•  Engine start at hot condition:On
•  The following PIDs
―  IAT
―  RPM
―  ECT
―  TP
―  VPWR
•  PRC solenoid valve
2T
FUELPW1
(Fuel injector)
ms
•  Ignition switch on:0.0ms
•  Idle:3.0—5.0ms
•  The following PIDs
―  IAT
―  RPM
―  ECT
―  MAF
―  TP
―  O2S11
―  VPWR
―  PSP
―  BOO
―  ACSW
•  CMP sensor
2U, 2V
IAC
(IAC valve control)
ms
•  Idle:2.4—2.7ms
•  The following PIDs
―  IAT
―  RPM
―  ECT
―  MAF
―  TP
―  PSP
―  ACSW
―  Test
―  CPP/PNP
•  IAC valve
2W
IAT
(Intake air temperature)
°C
°F
•  Indicate the IAT
•  IAT sensor
2L
V
•  IAT 20 °C {68 °F}:2.15 V
IDLE_SW
(Idle switch)
Idle/Off Idle
•  Accelerator depressed:Off idle
•  Accelerator released:Idle
•  Idle switch
1N
LOAD
(Engine load)
%
•  Indicate the engine load
—
—
LONGFT1
(Long term fuel trim)
%
•  Indicate the long term fuel trim
—
—
MAF
(Mass air flow)
g/s
•  Indicate the MAF amount
•  MAF sensor
2O
V
•  Ignition switch to the ON position:1.45 V
•  Idle (after warm up):2.15 V
MIL
(Malfunction indicator)
On/Off
•  Indicate that the engine control system malfunction accurs
Perform applicable DTC troubleshooting
—
MTSW
(Transmission distinction)
1/0
•  Ignition switch to the ON position:1
•  Related wiring harness
1L
O2S11
(O2S)
V
•  Ignition switch on:0—1.0V
•  Idle (After warm up):0—1.0V
•  Acceleration (After warm up):0.5—1.0V
•  Deceleration (After warm up):0—0.5V
•  O2S
2N
PSP
(PSP switch)
High/Low
•  Steering wheel fully turned:High
•  Steering wheel straight ahead position:Low
•  PSP switch
1P
RPM
(Engine speed)
RPM
•  Indicate engine speed
•  CMP sensor
—
SELTESTDTC
(Diagnostic trouble codes)
—
—
Perform applicable DTC troubleshooting
—
SHRTFT1
(Short term fuel trim)
%
•  Indicate the short term fuel trim
—
—
SPARKADV
(Ignition timing)
°
•  Indicate the ignition timing
•  The following PIDs
―  MAF
―  IAT
―  RPM
―  TP
―  ECT
―  PSP
―  CPP/PNP
―  ACSW
―  Test
•  CMP sensor
•  Idle speed and ignition timing
2E
Test
(Test mode)
ON/OFF
•  Test mode On:ON
•  Test mode Off:OFF
—
—
TP
(TP sensor)
V
•  Closed throttle position:0.4—0.6 V
•  Wide open throttle:3.4—4.7 V
•  TP sensor
2M
VPWR
(Battery positive voltage)
V
•  Under any condition:B+
•  Battery
1A
VSS
(Vehicle speed)
KPH
•  Vehicle speed 20 km/h {mph}:20 km/h {mph}
•  Vehicle speed 40 km/h {mph}:40 km/h {mph}
•  VSS
1M


Without Using the M-MDS

Caution
•  The PCM terminal voltages vary with change in measuring conditions and vehicle conditions. Always carry out a total inspection of the input systems, and PCM to determine the cause of trouble. Otherwise, a wrong diagnosis will be made.

1.  Remove the PCM.

2.  Reconnect PCM connector and battery negative terminal.

Note
•  With the PCM connector connected, body ground the voltmeter negative ( - ) lead and measure voltage at each PCM terminal by inserting the voltmeter positive ( + ) lead.

3.  Measure the voltage at each terminal.

•  If any incorrect voltage is detected, inspect the related system(s), wiring harnesses and connector(s) referring to the Action column in the terminal voltage table.


Terminal voltage table (Reference)

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Terminal

Signal

Connected to

Test condition

Voltage (V)

Inspection item
1A
Back-up power supply
Battery
Under any condition
B+
•  Battery
•  Related wiring harness
1B
Power supply
Main relay
Ignition switch off
1.0 or less
•  Related wiring harness
Ignition switch to the ON position
B+
1C
—
—
—
—
—
1D
Serial communication
DLC (Terminal KLN)
Because of this terminal is for serial communication, good/no good judgment by terminal voltage is not possible. Carry out inspection according to DTCs.
—
—
1E
DTC output
DLC (Terminal FEN)
Ignition switch to the ON position and terminal TEN (in DLC) short to chassis ground
Not DTC stored
1.0 or less
•  Related wiring harness
DTC stored
0—B+
DLC-2 (Terminal KLN)
Because of this terminal is for serial communication, good/no good judgment by terminal voltage is not possible. Carry out inspection according to DTCs.
—
—
1F
—
—
—
—
—
1G
—
—
—
—
—
1H
Fuel pump control
Fuel pump relay
Ignition switch to the ON position
B+
•  Fuel pump relay
•  Related wiring harness
Cranking
1.0 or less
Idle
1I
—
—
—
—
—
1J
A/C control
A/C relay
A/C not operating
B+
•  A/C relay
•  Related wiring harness
A/C operating
1.0 or less
1K
Diagnostic test mode
DLC (Terminal TEN)
Ignition switch to the ON position
Terminal TEN (DLC) open
B+
•  Related wiring harness
Terminal TEN (DLC) short to ground
1.0 or less
1L
Transmission distinction
Ground
Under any condition
1.0 or less
•  Related wiring harness
1M
Vehicle speed
VSS
Vehicle stopped
0 or Approx. 5.0
•  VSS
•  Related wiring harness
Vehicle running
Approx. 5.0
1N
CTP
CTP switch
Ignition switch to the ON position
Accelerator pedal depressed
B+
•  CTP switch
•  Related wiring harness
Accelerator pedal released
1.0 or less
1O
Brake
Brake switch
Brake pedal depressed
B+
•  Brake switch
•  Related wiring harness
Brake pedal released
1.0 or less
1P
PSP
PSP switch
Idle
Steering wheel at straight ahead position
B+
•  PSP switch
•  Related wiring harness
While turning steering wheel
1.0 or less
1Q
A/C
A/C switch
Ignition switch to the ON position
A/C switch and fan switch on
1.0 or less
•  A/C switch
•  Related wiring harness
A/C switch off
B+
1R
4×2/4×4 distinction*1
Ground
Under any condition
1.0 or less
•  Related wiring harness
1S
—
—
—
—
—
1T
—
—
—
—
—
1U
—
—
—
—
—
1V
Load/no load distinction
Neutral/clutch switch
Ignition switch to the ON position
Transmission neutral position or clutch pedal depressed
1.0 or less
•  Neutral switch
•  Clutch switch
•  Related wiring harness
Other than transmission neutral and clutch pedal released
B+
2A
Fuel injector ground
Ground
Under any condition
1.0 or less
•  Related wiring harness
2B
Power ground
Ground
Under any condition
1.0 or less
•  Related wiring harness
2C
System ground
Ground
Under any condition
1.0 or less
•  Related wiring harness
2D
Internal ground
MAF sensor, IAT sensor, ECT sensor, O2S, TP sensor
Under any condition
1.0 or less
•  Related wiring harness
2E
CMP
CMP sensor (integrated into distributor)
Ignition switch to the ON position
5.0
•  CMP sensor
•  Related wiring harness
Idle
1.8—2.3
2F
IGT control
Igniter
Ignition switch to the ON position
1.0 or less
•  Ignition control module
•  Related wiring harness Related wiring harness
Idle
0.35—0.5
2G
—
—
—
—
—
2H
—
—
—
—
—
2I
—
—
—
—
—
2J
—
—
—
—
—
2K
Constant voltage (Vref)
TP sensor
Ignition switch to the ON position
4.5—5.5
•  Related wiring harness
2L
IAT
IAT sensor
Ignition switch to the ON position
IAT 20 °C {68 °F}
2.15
•  IAT sensor
•  Related wiring harness
2M
TP
TP sensor
Ignition switch to the ON position
APP is released
0.4—0.6
•  TP sensor
•  Related wiring harness
APP is depressed
3.4—4.7
2N
O2S
O2S
Ignition switch to the ON position
0.55
•  O2S
•  Related wiring harness
Idle
Engine cold
0.0—1.0
After warm up
0.0—1.0
Acceleration
0.5—1.0
Deceleration
0.0—0.5
2O
MAF
MAF sensor
Ignition switch to the ON position
1.45
•  MAF sensor
•  Related wiring harness
Idle (after warm up)
2.15
2P
—
—
—
—
—
2Q
ECT
ECT sensor
Ignition switch to the ON position
IAT 20 °C {68 °F}
1.02
•  ECT sensor
•  Related wiring harness
After warm up
0.58
2R
—
—
—
—
—
2S
—
—
—
—
—
2T
Pressure regulator control
PRC solenoid valve
Idle (after warm up)
B+
•  PRC solenoid valve
•  Related wiring harness
2U
Fuel injector control
Fuel injector No.1, No.3
Ignition switch to the ON position
B+
•  Fuel injector
•  Related wiring harness
Idle
B+
2V
Fuel injector No.2, No.4
Ignition switch to the ON position
B+
•  Fuel injector
•  Related wiring harness
Idle
B+
2W
IAC
IAC valve
Ignition switch to the ON position
0.2
•  IAC valve
•  Related wiring harness
Idle (after warm up)
Approx. 1.0
2X
Purge control
Purge solenoid valve
Ignition switch to the ON position
B+
•  Purge solenoid valve
•  Related wiring harness
Idle
B+
2Y
—
—
—
—
—
2Z
Engine speed output
Tachometer (integrated into instrument cluster)
Ignition switch to the ON position
B+
•  Instrument cluster
•  Related wiring harness
Idle
4.9—7.0

*1  :4×2