Mitsubishi Grandis. Manual — part 839
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-23
STEP 13. Check the harness between A/T control
solenoid valve assembly connector B-109
terminal No.1 and engine-A/T-ECU connector
C-113 terminal No.119.
Check the output line for short-circuited or open
circuit.
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair the wiring harness.
STEP 14. Check the harness between A/T control
solenoid valve assembly connector B-109
terminal No.2 and engine-A/T-ECU connector
C-113 terminal No.96.
Check the earth line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair the wiring harness.
Code No.16: A/T fluid temperature sensor system (short circuit)
A/T FLUID TEMPERATURE SENSOR
SYSTEM CIRCUIT
Refer to
.
OPERATION
Refer to
.
DIAGNOSIS CODE SET CONDITION
If the A/T fluid temperature sensor output voltage has
been approximately 0 V for at least one second
(indicating abnormally high oil temperature), it
indicates that the A/T fluid temperature sensor circuit
is shorted and diagnosis code No.16 will be set.
AC303628
B-109 (GR)
Harness side
AG
Connector: B-109
AC311284
Engine-A/T-ECU
Harness side
Engine-A/T-ECU
C-113 (GR)
C-113 (GR)
104
93
95
98
92
94
96
97
99
100
91
103
110
111
101
108
109
105
107
106
102
115
117
112
118
116
114 113
120 119
AF
Connector: C-113 <LHD>
Connector: C-113 <RHD>
AC303628
B-109 (GR)
Harness side
AG
Connector: B-109
AC311284
Engine-A/T-ECU
Harness side
Engine-A/T-ECU
C-113 (GR)
C-113 (GR)
104
93
95
98
92
94
96
97
99
100
91
103
110
111
101
108
109
105
107
106
102
115
117
112
118
116
114 113
120 119
AF
Connector: C-113 <LHD>
Connector: C-113 <RHD>
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-24
POSSIBLE CAUSES
• Malfunction of the A/T fluid temperature sensor
• Damaged harness wires and connectors
• Malfunction of the engine-A/T-ECU
DIAGNOSIS
STEP 1. MUT-III data list
Item 15: A/T fluid temperature sensor (Refer to Data
List Table
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Cope with Intermittent
NO :
Go to Step 2.
STEP 2. Connector check: B-109 A/T control
solenoid valve assembly
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the defective connector.
STEP 3. Measure the voltage at A/T control
solenoid valve assembly connector B-109.
(1) Disconnect the connector, and measure the
voltage between terminal 1 and earth at the
wiring harness side.
(2) Turn the ignition switch to the ON position.
OK: 4.5
− 4.9 V
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Go to Step 6.
STEP 4. Measure the resistance at A/T control
solenoid valve assembly connector B-109.
Disconnect the connector, and measure the
resistance between terminal 1 and 2 at the sensor
side.
OK:
• 16.7 − 20.5 kΩ (at 0°C)
• 7.3 − 8.9 kΩ (at 20°C)
• 3.4 − 4.2 kΩ (at 40°C)
• 1.9 − 2.2 kΩ (at 60°C)
• 1.0 − 1.2 kΩ (at 80°C)
• 0.57 − 0.69 kΩ (at 100°C)
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Replace the A/T fluid temperature sensor.
STEP 5. MUT-III data list
Item 15: A/T fluid temperature sensor (Refer to Data
List Table
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Cope with Intermittent
Malfunction
).
NO :
Replace the engine-A/T-ECU.
STEP 6. Measure the voltage at engine-A/T-ECU
connector C-113.
(1) Connect A/T control solenoid valve assembly
connector B-109.
AC303628
B-109 (GR)
Harness side
AG
Connector: B-109
AC303628
B-109 (GR)
Harness side
AG
Connector: B-109
AC303628AF
B-109 (GR)
Connector: B-109
Sensor side
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-25
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between engine-A/T-ECU
connector C-113 terminal No.119 and earth.
OK:
• 3.8 − 4.0 V (at 20°C)
• 3.2 − 3.4 V (at 40°C)
• 1.7 − 1.9 V (at 80°C)
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Go to Step 7.
STEP 7. Connector check: C-113 engine-A/T-ECU
connector
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Repair the defective connector.
AC311284
Engine-A/T-ECU
Harness side
Engine-A/T-ECU
C-113 (GR)
C-113 (GR)
104
93
95
98
92
94
96
97
99
100
91
103
110
111
101
108
109
105
107
106
102
115
117
112
118
116
114 113
120 119
AF
Connector: C-113 <LHD>
Connector: C-113 <RHD>
AC311284
Engine-A/T-ECU
Harness side
Engine-A/T-ECU
C-113 (GR)
C-113 (GR)
104
93
95
98
92
94
96
97
99
100
91
103
110
111
101
108
109
105
107
106
102
115
117
112
118
116
114 113
120 119
AF
Connector: C-113 <LHD>
Connector: C-113 <RHD>
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-26
STEP 8. Check the harness between A/T control
solenoid valve assembly connector B-109
terminal No.1 and engine-A/T-ECU connector
C-113 terminal No.119.
Check the output line for short-circuited or open
circuit.
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the wiring harness.
AC303628
B-109 (GR)
Harness side
AG
Connector: B-109
AC311284
Engine-A/T-ECU
Harness side
Engine-A/T-ECU
C-113 (GR)
C-113 (GR)
104
93
95
98
92
94
96
97
99
100
91
103
110
111
101
108
109
105
107
106
102
115
117
112
118
116
114 113
120 119
AF
Connector: C-113 <LHD>
Connector: C-113 <RHD>
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