Mitsubishi Galant (2004+). Manual — part 1289
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-849
DTC P1603: Battery Backup Line Malfunction
.
TECHNICAL DESCRIPTION
• The PCM checks the open circuit of battery
backup line.
NOTE: When the system detects an open circuit in
the battery backup line, it makes 1 failure judgment
of other diagnostic trouble codes (DTCs).
.
RED-WHITE
AK302869
RED-WHITE
WHITE
BATTERY
42
BATTERY
BACKUP
POWERTRAIN CONTROL
MODULE (PCM)
Battery Backup Circuit
B-20
9
20A
RELAY
BOX
22
21
23 24 25
26 27 28 29
30 31 32 33 34
35 36 37 38
39 40 41 42 43
AK303085
CONNECTOR: B-20
PCM
AB
AIR CLEANER
B-20
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-850
DESCRIPTIONS OF MONITOR METHODS
Battery backup line voltage is under specified value.
.
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
.
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine starting sequence was completed.
• Battery positive voltage is higher than 10 volts.
Judgement Criteria
• Battery backup line voltage has continued to be 6
volts or lower for 2 seconds.
.
OBD-II DRIVE CYCLE PATTERN
None.
.
START
MONITORING
CONDITIONS
CIRCUIT VOLTAGE
MALFUNCTION
CONTINUOUS
FAILURE FOR 2secs
NO
YES
YES
NO
< 6V
END
GOOD
NO
Yes
AK302411
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-851
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Open or shorted battery backup line, harness
damage or connector damage.
• PCM failed.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
• MB991923: Power Plant ECU Check Harness
STEP 1. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
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) Erase the DTC.
(4) Start the engine and run it at idle.
(5) Read the DTC.
(6) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P1603 set?
YES : Go to Step 2.
NO : The inspection is complete.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-852
STEP 2. Measure the backup power supply voltage at PCM
connector B-20 by using power plant ECU check harness
special tool MB991923.
(1) Disconnect the all PCM connectors and connect power
plant ECU check harness special tool MB991923 between
the separated connectors.
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
AK203002
25
21
24 23 22
29 28 27 26
34 33 32 31 30
38 37 36 35
43 42 41 40 39
AB
POWER PLANT ECU
CHECK HARNESS CONNECTOR
MB991923
PCM
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