Mitsubishi Galant 9G. Manual — part 934
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-36
P0403
Exhaust gas recirculation control circuit
P0421
Warm up catalyst efficiency below threshold (bank 1)
P0431
Warm up catalyst efficiency below threshold (bank 2)
P0441
Evaporative emission control system incorrect purge flow
P0442
Evaporative emission control system leak detected (Small leak)
P0443
Evaporative emission control system purge control valve circuit
P0446
Evaporative emission control system vent control circuit
P0450
Evaporative emission control system pressure sensor malfunction
P0451
Evaporative emission control system pressure sensor range/performance
P0452
Evaporative emission control system pressure sensor low input
P0453
Evaporative emission control system pressure sensor high input
P0455
Evaporative emission control system leak detected (Gross leak)
P0456
Evaporative emission control system leak detected (Very small leak)
P0461
Fuel level sensor (main) circuit range/performance
P0462
Fuel level sensor circuit low input
P0463
Fuel level sensor circuit high input
P0506
Idle control system RPM lower than expected
P0507
Idle control system RPM higher than expected
P0513
Immobilizer malfunction
P0551
Power steering pressure switch circuit range/performance
P0554
Power steering pressure switch circuit intermittent
P0603
EEPROM malfunction
P0606*
Powertrain control module main processor malfunction
P0622
Generator FR terminal circuit malfunction
P0630
VIN malfunction
P0638*
Throttle actuator control motor circuit range/ performance problem
P0642*
Throttle position sensor power supply
P0657
Throttle actuator control motor relay circuit malfunction
P0705
Transmission range
switch circuit malfunction
(PRNDL input)
• A/T DTC No. 27 (Transmission range switch
system: Open circuit)
• A/T DTC No. 28 (Transmission range switch
system: Short circuit)
P0712*
Transmission fluid
temperature sensor low
input
• A/T DTC No. 16 (Transmission fluid
temperature sensor system: Short circuit)
P0713*
Transmission fluid
temperature sensor high
input
• A/T DTC No. 15 (Transmission fluid
temperature sensor system: Open circuit)
DTC
DIAGNOSTIC ITEM
REFERENCE
PAGE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-37
P0715*
Input/turbine speed
sensor circuit
• A/T DTC No. 22 (Input shaft speed sensor
system: Short circuit/Open circuit)
P0720*
Output speed sensor
circuit
• A/T DTC No. 23 (Output shaft speed sensor
system: Short circuit/Open circuit)
P0731*
Gear 1 incorrect
• A/T DTC No. 41 (1st gear incorrect ratio)
P0732*
Gear 2 incorrect
• A/T DTC No. 42 (2nd gear incorrect ratio)
P0733*
Gear 3 incorrect
• A/T DTC No. 43 (3rd gear incorrect ratio)
P0734*
Gear 4 incorrect
• A/T DTC No. 44 (4th gear incorrect ratio)
P0736*
Gear R incorrect
• A/T DTC No. 46 (Reverse gear incorrect
ratio)
P0741
Torque converter clutch
circuit performance or
stuck off
• A/T DTC No. 52 (Torque converter clutch
solenoid system: Defective system)
P0742
Torque converter clutch
circuit stuck on
• A/T DTC No. 53 (Torque converter clutch
solenoid system: Lock-up stuck on)
P0743*
Torque converter clutch
circuit electrical
• A/T DTC No. 36 (Torque converter clutch
solenoid system: Short circuit/Open circuit)
P0753*
Shift solenoid "A"
electrical
• A/T DTC No. 31 (Low and reverse solenoid
valve system: Short circuit/Open circuit)
P0758*
Shift solenoid "B"
electrical
• A/T DTC No. 32 (Underdrive solenoid valve
system: Short circuit/Open circuit)
P0763*
Shift solenoid "C"
electrical
• A/T DTC No. 33 (Second solenoid valve
system: Short circuit/Open circuit)
P0768*
Shift solenoid "D"
electrical
• A/T DTC No. 34 (Overdrive solenoid valve
system: Short circuit/Open circuit)
P1530
A/C1 switch circuit intermittent
P1602*
Communication malfunction (between PCM main processor and system
LSI)
P1603*
Battery backup line malfunction
P1751*
A/T control relay
malfunction
• A/T DTC No. 54 (A/T control relay system:
Short circuit to ground /open circuit)
P2066
Fuel level sensor (sub) circuit range/performance
P2100*
Throttle actuator control motor circuit (open)
P2101*
Throttle actuator control motor magneto malfunction
P2122*
Accelerator pedal position sensor (main) circuit low input
P2123*
Accelerator pedal position sensor (main) circuit high input
P2127*
Accelerator pedal position sensor (sub) circuit low input
P2128*
Accelerator pedal position sensor (sub) circuit high input
P2135*
Throttle position sensor (main and sub) range/performance problem
P2138*
Accelerator pedal position sensor (main and sub) range/performance
problem
DTC
DIAGNOSTIC ITEM
REFERENCE
PAGE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-38
NOTE: Do not replace the powertrain control module (PCM) until a through terminal check reveals there are
no short/open circuits.
NOTE: Check that the PCM ground circuit is normal before checking for the cause of the problem.
NOTE: After the PCM detects a malfunction, a diagnostic trouble code is recorded the next time the engine is
started and the same malfunction is re-detected. However, for items marked with a "*", the diagnostic trouble
code is recorded on the first detection of the malfunction.
NOTE: Sensor 1 indicates the sensor mounted at a position closest to the engine, and sensor 2 indicates the
sensor mounted at the position second closest to the engine.
NOTE: Bank 1 indicates the right bank side cylinder, and Bank 2 indicates the left bank side cylinder.
SYMPTOM CHART
M1131151500726
CAUTION
During diagnosis, a DTC associated with other
system may be set when the ignition switch is
turned on with connector(s) disconnected. On
completion, confirm all systems for DTC(s). If
DTC(s) are set, erase them all.
CAUTION
Disconnecting the battery cables or removing the
combination meter will erase the learned value of
the fuel gauge. To recover the learned value,
input a vehicle speed (by actually driving the
vehicle or inputting a simulated vehicle speed),
and stop the vehicle. This will complete the learn-
ing process.
.
NOTE: Check that the PCM ground circuit is normal
before checking for the cause of the problem.
P2228*
Barometric pressure circuit low input
P2229*
Barometric pressure circuit high input
U1073
Bus off
U1102
ABS
−ECU time−out
U1108*
Combination meter time
−out
U1110
A/C
−ECU time−out
DTC
DIAGNOSTIC ITEM
REFERENCE
PAGE
TROUBLE SYMPTOMS
INSPECTION
PROCEDURE
REFERENCE
PAGE
Communication
with scan tool is
impossible
Communication with all systems is not possible
1
Communication with PCM only is not possible
2
Malfunction
Indicator Lamp
(SERVICE
ENGINE SOON
or Check
Engine Lamp)
and related
parts
The Malfunction Indicator Lamp (SERVICE ENGINE
SOON or Check Engine Lamp) does not illuminate
right after the ignition switch is turned to the "ON"
position
3
The Malfunction Indicator Lamp (SERVICE ENGINE
SOON or Check Engine Lamp) remains illuminated
and never goes out
4
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-39
.
PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)
Starting
Cranks, won't start
5
Starts up and dies
6
Hard starting
7
Idling stability
(improper
idling)
Unstable idle (rough idle, hunting)
8
Idle speed is high (improper idle speed)
9
Idle speed is low (improper idle speed)
10
Idling stability
(engine stalls)
When the engine is cold, it stalls at idle (die out)
11
When the engine is hot, it stalls at idle (die out)
12
The engine stalls when accelerating (pass out)
13
The engine stalls when decelerating
14
Driving
Hesitation, sag or stumble
15
Acceleration shock
16
Deceleration shock
17
Poor acceleration
18
Surge
19
Knocking
20
Dieseling (Run-on)
21
Too high CO and HC concentration when idling
22
IM240 test
failure
Transient, mass emission tailpipe test failure
23
Purge flow test of the evaporative emission canister
failure
24
Pressure test of the evaporative system failure
25
Generator output voltage is low (approximately 12.3 volts)
26
Fans (radiator fan, A/C condenser fan) are inoperative
27
Power supply system and ignition switch-IG system
28
Fuel pump system
29
Ignition switch-ST system and transmission range switch system
30
Ignition circuit system
31
A/C system
32
TROUBLE SYMPTOMS
INSPECTION
PROCEDURE
REFERENCE
PAGE
ITEMS
SYMPTOM
At starting
Won't start
The starter cranks the engine, but there is no combustion within the
cylinders, and the engine won't start.
Starts up and
dies
The engine starts, but then engine soon stalls.
Hard starting
Engine starts after cranking a while.
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