Mitsubishi Eclipse. Manual — part 168
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-165
.
CIRCUIT OPERATION
• A 5-volt power supply is applied on the throttle
position sensor power terminal (terminal No. 3)
from the ECM (terminal No. 81) <M/T> or PCM
(terminal No. 46) <A/T>.
The ground terminal (terminal No. 2) is grounded
with ECM (terminal No. 92) <M/T> or PCM (termi-
nal No. 57) <A/T>.
• When the throttle valve shaft is turned from the
idle position to the fully opened position, the
resistor between the throttle position sensor out-
put terminal (terminal No. 3) and ground terminal
will increase according to the rotation.
.
TECHNICAL DESCRIPTION
• The throttle position sensor outputs voltage which
corresponds to the throttle valve opening angle.
• The ECM <M/T> or PCM <A/T> checks whether
the voltage is within a specified range.
.
DESCRIPTIONS OF MONITOR METHODS
Compare load value with throttle position sensor out-
put voltage.
.
MONITOR EXECUTION
Continuous
.
MONITOR EXECUTION CONDITIONS (Other
monitor and Sensor)
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• Not applicable
Sensor (The sensor below is determined to be
normal)
• Volume airflow sensor
.
AK300060
PCM
CONNECTORS: C-54, C-57 <A/T>
AI
C-57 (GR)
C-54 (GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-166
DTC SET CONDITIONS <Range/Performance problem-Relation between main and sub>
Logic Flow Chart
.
Check Conditions
• 2 seconds or more have passed since the staring
sequence was completed.
• Engine speed is higher than 2,000 r/min.
• Volumetric efficiency is higher than 60 percent.
Judgement Criteria
• Throttle position sensor output voltage has con-
tinued to be 0.8 volt or lower for 2 seconds.
.
START
ENGINE SPEED > 2000rpm
LOAD VALUE > 60%
END
NO
NO
NO
NO
YES
YES
YES
YES
MALFUNCTION
GOOD
OUTPUT VOLTAGE
< 0.8V
MONITORING
CONDITIONS
CONTINUOUS
FAILURE FOR 2 secs
AK301427
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-167
DTC SET CONDITIONS <Range/Performance problem-relation between main and sub>
Logic Flow Chart
.
Check Conditions
• 2 seconds or more have passed since the staring
sequence was completed.
• Engine speed is lower than 3,000 r/min.
• Volumetric efficiency is lower than 30 percent.
Judgement Criteria
• Throttle position sensor output voltage has con-
tinued to be 4.6 volts or higher for 2 seconds.
.
OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-ll Drive Cycle −
Procedure 6
.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Throttle position sensor failed or maladjusted.
• Open throttle position sensor circuit, harness
damage or connector damage.
• ECM failed. <M/T>
• PCM failed. <A/T>
START
ENGINE SPEED < 3000rpm
LOAD VALUE < 30%
END
NO
NO
NO
NO
YES
YES
YES
YES
MALFUNCTION
GOOD
MONITORING
CONDITIONS
CONTINUOUS
FAILURE FOR 2 secs
OUTPUT VOLTAGE
> 4.6V
AK301428
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-168
DIAGNOSIS
Required Special Tools:
• MB991958 (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
STEP 1. Using scan tool MB991958, check data list item 14:
Throttle Position Sensor.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the data reading mode for item
14, Throttle Position Sensor.
• With the throttle valve in the idle position, voltage should
be between 0.535 and 0.735 volt.
• With the throttle valve in the full-open position, voltage
should be between 4.5 and 5.5 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
NO : Go to Step 2.
STEP 2. Check connector B-07 at throttle position sensor
for damage.
Q: Is the connector in good condition?
YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 14.
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
AK300402
2 1
3
4
CONNECTOR: B-07
AB
B-07 (B)
HARNESS CONNECTOR:
COMPONENT SIDE
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