Mitsubishi Grandis. Manual — part 739
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-207
Code No. P0622: Alternator FR Terminal System
OPERATION
• The energized state of the alternator field coil is
inputted from the alternator (terminal No. 4) to the
engine-ECU <M/T> or engine-A/T-ECU <A/T>
(terminal No. 86).
FUNCTION
• A signal of the power supply duty ratio for the
alternator field coil is inputted to the engine-ECU
<M/T> or engine-A/T-ECU <A/T>.
• In response to the signal, the engine-ECU <M/T>
or engine-A/T-ECU <A/T> detects the alternator
output current and controls the idling speed
according to the output current (electric load).
TROUBLE JUDGMENT
Check Condition
• Engine speed is 50 r/min or higher.
Judgment Criterion
• Input voltage from the alternator FR terminal has
continued to be approximately battery positive
voltage for 20 seconds.
PROBABLE CAUSE
• Failed alternator
• Open/short circuit in alternator FR terminal circuit
or loose connector
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
AK305598
4
3
2
1
61
656667686970 717273
74757677787980 8182
8384
858687
8889
62
6364
AB
Engine-ECU <M/T> or
engine-A/T-ECU <A/T>
Alternator
Y-B
Y-B
IC voltage
regulator
B-17
86
3
4
Alternator circuit
B-119
(MU802046)
C-112
(MU803804)
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
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-208
DIAGNOSIS PROCEDURE
STEP 1. Connector check: B-119 alternator
connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace.
STEP 2. Perform voltage measurement at B-119
alternator connector.
• Disconnect connector, and measure at male
connector side.
• Ignition switch: ON
• Voltage between terminal No. 4 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Go to Step 3 .
STEP 3. Connector check: C-112 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector.
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Repair or replace.
AK300990
2
1
3
4
AC
B-119 (GR)
Connector: B-119
Harness side connector
AK300990
2
1
3
4
AC
B-119 (GR)
Connector: B-119
Harness side connector
AK305617
Connector: C-112
C-112 (GR)
C-112 (GR)
AB
Harness side connector
<R.H. drive vehicles>
<L.H. drive vehicles>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-209
STEP 4. Check harness between B-119 (terminal
No. 4) alternator connector and C-112 (terminal
No. 86) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.
NOTE: Before checking harness, check intermediate
connector B-17, and repair if necessary.
• Check output line for open/short circuit.
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair.
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
).
STEP 6. Perform voltage measurement at C-112
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.
• Measure engine-ECU <M/T> or engine-A/T-ECU
<A/T> terminal voltage.
• Engine: Idle after warm-up
• Transmission: Neutral <M/T> or P range <A/T>
• Radiator fan: Inactive
• Voltage between terminal No. 86 and earth.
OK: Switching the headlamps to ON from
OFF causes the voltage to fall.
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Go to Step 5 .
AK300990
2
1
3
4
AC
B-119 (GR)
Connector: B-119
Harness side connector
AK305617
Connector: C-112
C-112 (GR)
C-112 (GR)
AB
Harness side connector
<R.H. drive vehicles>
<L.H. drive vehicles>
AK305617
Connector: C-112
C-112 (GR)
C-112 (GR)
AB
Harness side connector
<R.H. drive vehicles>
<L.H. drive vehicles>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-210
STEP 7. Check harness between B-119 (terminal
No. 4) alternator connector and C-112 (terminal
No. 86) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.
NOTE: Before checking harness, check intermediate
connector B-17, and repair if necessary.
• Check output line for damage.
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Repair.
STEP 8. Check trouble symptom.
Q: Same symptoms regenerated?
YES :
Replace alternator.
NO :
Intermittent malfunction (Refer to Group 00
− How to Use troubleshooting/Inspection
Service Points
Code No. P0638: Throttle Valve Control Servo Circuit Range/Performance Problem
OPERATION
• Refer to P0657 − Throttle valve control servo
circuit
• Refer to P2101 − Throttle valve control servo
circuit
FUNCTION
• engine-ECU <M/T> or engine-A/T-ECU <A/T>
checks the electronic controlled throttle system
for abnormal conditions.
AK305617
Connector: C-112
C-112 (GR)
C-112 (GR)
AB
Harness side connector
<R.H. drive vehicles>
<L.H. drive vehicles>
AK300990
2
1
3
4
AC
B-119 (GR)
Connector: B-119
Harness side connector
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