Mitsubishi Galant 9G. Manual — part 1170
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-980
DTC SET CONDITIONS
<Range/Performance problem -relation between main and sub>
Logic Flow Chart
.
Check Condition
• Ignition switch is "ON" position.
• Accelerator pedal position sensor (main) output
voltage is between 0.6 and 4.8 volts.
• Accelerator pedal position sensor (sub) output
voltage is between 0.2 and 4.8 volts.
• Change of accelerator pedal position sensor
(sub) output voltage per 25 milliseconds is lower
than 0.06 volt.
Judgement Criteria
• Voltage obtained with the formula given below is
1.0 volt or higher for 0.2 second: [accelerator
pedal position sensor (main) output voltage
−
[accelerator pedal position sensor (sub) output
voltage +0.3 volt].
.
OBD-II DRIVE CYCLE PATTERN
None.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Accelerator pedal position sensor failed.
• Harness damage in accelerator pedal position
sensor circuit or connector damage.
• PCM failed.
AK303911
START
END
NO
NO
YES
YES
YES
NO
MALFUNCTION
GOOD
CONTINUOUS
FAILURE FOR 0.2secs
MONITORING
CONDITIONS
APS (MAIN) -
{APS (SUB) +0.3V}
> =1.0V
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-981
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
STEP 1. Check harness connector C-24 at accelerator
pedal position sensor for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 16.
STEP 2. Check the continuity at accelerator pedal position
sensor harness side connector C-24.
(1) Disconnect the connector C-24 and measure at the harness
side.
(2) Measure the continuity between terminal No. 2 and ground.
• Should be less than 2 ohms.
Q: Does continuity exist?
YES : Go to Step 6.
NO : Go to Step 3.
AK303202
1
6 5 4 3 2
ACCELERATOR
PERAL
AB
CONNECTOR: C-24
C-24 (B)
ACCELERATOR
PEDAL POSITION
SENSOR
HARNESS
CONNECTOR:
COMPONENT SIDE
AK303202
1
6 5 4 3 2
ACCELERATOR
PERAL
AB
CONNECTOR: C-24
C-24 (B)
ACCELERATOR
PEDAL POSITION
SENSOR
HARNESS
CONNECTOR:
COMPONENT SIDE
1
6 5 4 3 2
AK303204
C-24 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-982
STEP 3. Check harness connector B-20 at PCM for
damage.
Q: Q: Is the harness connector in good condition?
YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 16.
AK303092
25
21
24 23 22
29 28 27 26
34 33 32 31 30
38 37 36 35
43 42 41 40 39
CONNECTOR: B-20
B-20
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-983
STEP 4. Check for harness damage between accelerator
pedal position sensor connector C-24 (terminal No. 2) and
PCM connector B-20 (terminal No. 31).
Q: Is the harness wire in good condition?
YES : Go to Step 5.
NO : Repair it. Then go to Step 16.
AK303202
1
6 5 4 3 2
ACCELERATOR
PERAL
AB
CONNECTOR: C-24
C-24 (B)
ACCELERATOR
PEDAL POSITION
SENSOR
HARNESS
CONNECTOR:
COMPONENT SIDE
AK303092
25
21
24 23 22
29 28 27 26
34 33 32 31 30
38 37 36 35
43 42 41 40 39
CONNECTOR: B-20
B-20
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
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