Mitsubishi Grandis. Manual — part 755
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-271
YES :
Go to Step 5 .
NO :
Repair.
STEP 9. Connector check: C-113 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Repair or replace.
STEP 10. Check harness between C-102 (terminal
No. 1) accelerator pedal position sensor
connector and C-113 (terminal No. 92)
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Repair.
AK305616AB
Connector: C-113
<L.H. drive vehicles>
<R.H. drive vehicles>
C-113 (GR)
C-113 (GR)
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
Harness side connector
AK305627
1
6 5 4 3 2
Connector: C-102
AB
C-102 (B)
Harness side
connector
C-102 (B)
<L.H. drive vehicles>
<R.H. drive vehicles>
AK305616AB
Connector: C-113
<L.H. drive vehicles>
<R.H. drive vehicles>
C-113 (GR)
C-113 (GR)
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
Harness side connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-272
STEP 11. Check harness between C-102 (terminal
No. 4) accelerator pedal position sensor
connector and C-113 (terminal No. 97)
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 12 .
NO :
Repair.
STEP 12. Check harness between C-102 (terminal
No. 3) accelerator pedal position sensor
connector and C-113 (terminal No. 114)
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.
• Check output line for damage.
Q: Is the check result normal?
YES :
Go to Step 13.
NO :
Repair.
AK305627
1
6 5 4 3 2
Connector: C-102
AB
C-102 (B)
Harness side
connector
C-102 (B)
<L.H. drive vehicles>
<R.H. drive vehicles>
AK305616AB
Connector: C-113
<L.H. drive vehicles>
<R.H. drive vehicles>
C-113 (GR)
C-113 (GR)
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
Harness side connector
AK305627
1
6 5 4 3 2
Connector: C-102
AB
C-102 (B)
Harness side
connector
C-102 (B)
<L.H. drive vehicles>
<R.H. drive vehicles>
AK305616AB
Connector: C-113
<L.H. drive vehicles>
<R.H. drive vehicles>
C-113 (GR)
C-113 (GR)
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
Harness side connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-273
STEP 13. Check harness between C-102 (terminal
No. 6) accelerator pedal position sensor
connector and C-113 (terminal No. 107)
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.
• Check output line for damage.
Q: Is the check result normal?
YES :
Go to Step 14 .
NO :
Repair.
STEP 14. Replace the accelerator pedal assembly
• After replacing the accelerator pedal assembly,
re-check the trouble symptoms.
Q: Is the check result normal?
YES :
Check end.
NO :
Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
AK305627
1
6 5 4 3 2
Connector: C-102
AB
C-102 (B)
Harness side
connector
C-102 (B)
<L.H. drive vehicles>
<R.H. drive vehicles>
AK305616AB
Connector: C-113
<L.H. drive vehicles>
<R.H. drive vehicles>
C-113 (GR)
C-113 (GR)
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
Harness side connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-274
Code No. P2173: Abnormal Intake Air Amount
FUNCTION
• Engine-ECU <M/T> or engine-A/T-ECU <A/T>
decides the allowable intake air amount in
accordance with the engine speed and the target
opening angle of throttle valve.
• Engine-ECU <M/T> or engine-A/T-ECU <A/T>
checks whether the actual intake air amount is
more than the allowable intake air amount.
TROUBLE JUDGMENT
Check Condition
• While engine is running.
Judgment Criterion
• The actual intake air amount is more than the
allowable in take air amount for 1.5 seconds.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are: )
• Failed air flow sensor.
• Throttle valve faulty operation.
• Failed throttle position sensor
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
DIAGNOSIS
STEP 1. MUT-III diagnosis code
Q: Diagnosis code set?
YES :
Inspection chart for diagnosis code (Refer
to
NO :
Go to Step 2 .
STEP 2. Replace the air flow sensor.
• After replacing the air flow sensor, re-check the
trouble symptoms.
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Check end.
STEP 3. Replace the throttle body assembly.
• After replacing the throttle body assembly,
re-check the trouble symptoms.
Q: Is the check result normal?
YES :
Replacing engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO :
Check end.
Code No. U1073: Bus Off
CAUTION
If diagnosis code U1073 is output from
engine-ECU <M/T> or engine-A/T-ECU <A/T>
surely perform CAN busline diagnosis.
CAUTION
Replace ECU after certainly confirming that the
communication circuits are normal.
TROUBLE JUDGMENT
Check Condition
• All the time
Judgment Criterion
• When the buss off error is detected.
COMMENT ON TROUBLE SYMPTOM
• The failure is possibly caused by malfunction of
the harness and connector in CAN busline or by
malfunction in engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
PROBABLE CAUSE
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
DIAGNOSIS
STEP 1. MUT-III CAN bus diagnostics
• Using MUT-III, perform CAN busline diagnosis.
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Correct CAN busline (Refer to 54D
−
Diagnosis
− Can Bus Diagnostics Chart
), and then go to Step 3 .
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