Mitsubishi Montero Sport (2004+). Manual — part 177
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-121
STEP 13. Check for harness damage between engine
coolant temperature sensor connector A-67 (terminal No.
1) and PCM connector C-90 (terminal No. 44).
Q: Is the harness wire in good condition?
YES : Replace the PCM. Then go to Step 14.
NO : Repair it. Then go to Step 14.
STEP 14. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Procedure 6 −
Other Monitor
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0116 set?
YES : Repeat the troubleshooting.
NO : The procedure is complete.
AK104023
1
2
A-67(B)
AB
CONNECTOR: A-67
HARNESS
CONNECTOR:
COMPONENT SIDE
AK103762
42
43
48
49
50
51
52
53
54
55
56
57
46 45 44
58
59
60
61
62
63
64
65
66
47
41
AB
CONNECTOR: C-90
C-90(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-122
DTC P0117: Engine Coolant Temperature Circuit Low Input
AK000421
Intake Air Temperature Sensor Circuit
BLA
CK
YELLO
W
-GREEN
BLA
CK
57
2
5V
POWERTRAIN CONTROL MODULE (PCM)
ENGINE COOLANT
TEMPERATURE SENSOR
12
1
44
16
1
10
2 3 4 5 6 7 8 9
11
12 13 14 15 16 17 18 19 20 21 22
23 24 25 26 27 28 29 30 31 32 33
C-71
47
41
42 43
48 49 50 51 52 53 54 55 56 57
46
45
44
58
59
60 61 62 63
64 65 66
C-90
(MU803781)
1 2
A-67
(MU802406)
JOINT
CONNEC-
TOR (4)
AK104030
ENGINE COOLANT
TEMPERATURE SENSOR
A-67(B)
AB
CONNECTOR: A-67
AK103738AC
CONNECTOR: C-90
PCM
C-90(GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-123
.
CIRCUIT OPERATION
• 5-volt voltage is applied to the engine coolant
temperature sensor output terminal (terminal No.
1) from the PCM (terminal No. 44) via the resistor
in the PCM. The ground terminal (terminal No. 2)
is grounded with (terminal No. 57).
• The engine coolant temperature sensor is a neg-
ative temperature coefficient type of resistor. It
has the characteristic that when the engine cool-
ant temperature rises the resistor decreases.
• The engine coolant temperature sensor output
voltage increases when the resistor increases
and decreases when the resistor decreases.
.
TECHNICAL DESCRIPTION
• The engine coolant temperature sensor converts
the engine coolant temperature to a voltage and
output it.
• The PCM checks whether this voltage is within a
specified range.
.
DESCRIPTIONS OF MONITOR METHODS
Engine coolant temperature sensor output voltage is
out of specified range.
.
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)
• Not applicable
.
AK103912AB
CONNECTOR: C-71
C-71
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-124
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 2 seconds or more have passed since the staring
sequence was completed.
Judgement Criteria
• Engine coolant temperature sensor output volt-
age has continued to be 0.1 volt or lower [corre-
sponding to coolant temperature of 140
°C
(284
°F) or higher] for 2 seconds.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Procedure 6
.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Engine coolant temperature sensor failed.
• Shorted engine coolant temperature sensor cir-
cuit, or connector damage.
• PCM failed.
START
OUTPUT VOLTAGE > 4.6V
OUTPUT VOLTAGE < 0.1V
END
NO
NO
NO
YES
YES
YES
MALFUNCTION
GOOD
CONTINUOUS
FAILURE FOR 2secs
MONITORING
CONDITIONS?
NO
YES
AK301426
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