Mitsubishi Grandis. Manual — part 745
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-231
Code No. P1603: Battery Backup Circuit Malfunction
OPERATION
• Power is directly supplied to the engine-ECU
<M/T> or engine-A/T-ECU <A/T> (terminal No.
58) from the battery.
FUNCTION
• The engine-ECU <M/T> or engine-A/T-ECU
<A/T> is check the open circuit of battery backup
line.
TROUBLE JUDGMENT
Check Conditions
• After engine starting sequence is completed.
• Battery positive voltage is 10 V or higher.
Judgment Criterion
• Battery backup line voltage is 6 V or lower for 2
seconds.
AK305569
31
35363738394041 42 43
444546474849
50 51
5253
545556
57 58
32
33 34
9
AB
Fusible link (26)
W
W
W-G
W-G
58
Battery
backup
Engine-ECU <M/T> or
engine-A/T-ECU <A/T>
3
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
20A
Relay
box
Battery backup circuit
A-16
C-111
(MU803803)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-232
PROBABLE CAUSE
• Open/short circuit in battery backup line circuit or
loose connector contact
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
DIAGNOSIS PROCEDURE
STEP 1. MUT-III diagnosis code
• Temporarily place the ignition switch in "LOCK"
(OFF) position, and 10 seconds after that, place it
in "ON" position again.
Q: Is the diagnosis code P1603 set?
YES :
Go to Step 2 .
NO :
Intermittent malfunction (Refer to GROUP
00
− How to use Troubleshooting/Inspection
).
STEP 2. Perform voltage measurement at C-111
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: ON
• Voltage between terminal No. 58 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Check intermediate connector A-16, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between battery and C-111
(terminal No. 58) engine-ECU <M/T>
connector or engine-A/T-ECU <A/T>
connector.
• Check power supply line for
open/short circuit.
STEP 3. Check harness between battery and
C-111 (terminal No. 58) engine-ECU <M/T>
connector or engine-A/T-ECU <A/T> connector.
NOTE: Before checking harness, check intermediate
connector A-16, and repair if necessary.
• Check earthing line for damage.
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Repair or replace.
AK305625AB
Connector: C-111
<L.H. drive vehicles>
<R.H. drive vehicles>
C-111 (GR)
C-111 (GR)
Harness side connector
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
52
53
54
55
56
57
58
50
51
AK305625AB
Connector: C-111
<L.H. drive vehicles>
<R.H. drive vehicles>
C-111 (GR)
C-111 (GR)
Harness side connector
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
52
53
54
55
56
57
58
50
51
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-233
STEP 4. Connector check: C-111 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector.
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair or replace.
STEP 5. Check the trouble symptoms.
Q: Does trouble symptom persist?
YES :
Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service
Points
AK305625AB
Connector: C-111
<L.H. drive vehicles>
<R.H. drive vehicles>
C-111 (GR)
C-111 (GR)
Harness side connector
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
52
53
54
55
56
57
58
50
51
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-234
Code No. P2100: Throttle Valve Control Servo Circuit (open)
OPERATION
• Controls the current that is applied from the
engine-ECU <M/T> or engine-A/T-ECU <A/T>
(terminals No. 133, No. 141) to the
electronic-controlled throttle valve (terminals No.
1, No. 2).
FUNCTION
• Engine-ECU <M/T> or engine-A/T-ECU <A/T>
varies the direction and the amperage of the
current that is applied to the throttle valve control
servo in order to control the opening of the
throttle valve.
TROUBLE JUDGMENT
Check Condition
• Battery positive voltage is 8.3 V or higher.
Judgement Criteria
• Throttle actuator control motor current is 0.1 A or
less for 0.72 second.
PROBABLE CAUSE
• Failed throttle valve control servo.
• Open/short circuit in throttle valve control servo
circuit or lose connector contact.
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
AK305570
6
1 2 3 4 5
121122
123 124
125126127128129 130 131 132 133
134135
136137 138 139 140 141
142143
144
145 146
1 2
3 4
5 6 7
11
10
9
8
AB
133
1
Engine-ECU <M/T> or
engine-A/T-ECU <A/T>
B
R-L
L-Y
B
141
145
144
4
3
11
B
2
B-06
GND
GND
Throttle valve control servo circuit
C-114
(MU803801)
C-115
(MU801850)
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
Electronic-controlled
throttle valve
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