Mitsubishi Grandis. Manual — part 840
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-27
Code No.22: Input shaft speed sensor system
ENGINE-
A/T-ECU
INPUT SHAFT
SPEED SENSOR
IGNITION
SWITCH (IG1)
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
Input shaft speed sensor system circuit
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-28
OPERATION
The input shaft speed sensor detects the speed of
the underdrive clutch retainer, and sends the
information to the engine-A/T-ECU as a pulse signal.
DIAGNOSIS CODE SET CONDITIONS
The diagnosis code No.22 will be set if the input shaft
speed sensor does not send a pulse signal for one
second or more while the 3rd gears are engaged and
the vehicle speed is 40 km/h or more (the output
shaft speed sensor speed is 1000 r/min or more).
If the code No.22 is set four times, the transmission
will be fixed in 3rd gear as a fail-safe measure.
However, the transmission can be downshifted to
2nd gear by operating the selector lever.
POSSIBLE CAUSES
• Malfunction of input shaft speed sensor
• Malfunction of underdrive clutch retainer
• Damaged harness wires and connectors
• Malfunction of the engine-A/T-ECU
DIAGNOSIS
STEP 1. MUT-III data list
Item 0001: Input shaft speed sensor (Refer to data
list reference 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-112 input shaft
speed sensor connector
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 resistance at input shaft
speed sensor connector B-112.
Disconnect the connector, and measure the
resistance between terminal 1 and earth at the wiring
harness side.
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Go to Step 4.
STEP 4. Measure the voltage at engine-A/T-ECU
connector C-112.
(1) Connect input shaft speed sensor connector
B-112.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between engine-A/T-ECU
connector C-112 terminal No.88 and earth.
OK: 0.5 V or less
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 5.
AC302452
Battery tray
B-112 (B)
Harness side
Connector: B-112
AG
AC302452
Battery tray
B-112 (B)
Harness side
Connector: B-112
AG
AC311284
Connector: C-112 <LHD>
Connector: C-112 <RHD>
Harness side
Engine-A/T-ECU
C-112 (GR)
C-112 (GR)
Engine-A/T-ECU
AG
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-29
STEP 5. Connector check: C-112 engine-A/T-ECU
connector
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the defective connector.
STEP 6. MUT-III data list
Item 0001: Input shaft speed sensor (Refer to data
list reference table
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Cope with Intermittent
NO :
Replace the engine-A/T-ECU.
STEP 7. Connector check: C-112 engine-A/T-ECU
connector, C-116 J/C (4)
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Repair the defective connector.
AC311284
Connector: C-112 <LHD>
Connector: C-112 <RHD>
Harness side
Engine-A/T-ECU
C-112 (GR)
C-112 (GR)
Engine-A/T-ECU
AG
AC311284
Connector: C-112 <LHD>
Connector: C-112 <RHD>
Harness side
Engine-A/T-ECU
C-112 (GR)
C-112 (GR)
Engine-A/T-ECU
AG
AC310615
C-116
Connector: C-116
<LHD>
AP
23
12
1
7
29
18
4
26
15
1314
25
24
2 3
1617
28
27
5 6
10
32
21
1920
3031
8 9
22
33
11
AC310628AS
C-116
Connector: C-116
<RHD>
23
12
1
7
29
18
26
13
25
24
2
28
27
4
15
14
3
1617
5 6
10
32
21
1920
3031
8 9
22
33
11
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-30
STEP 8. Check the harness between input shaft
speed sensor connector B-112 terminal No.1 and
engine-A/T-ECU connector C-112 terminal No.88.
Check the earth line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the wiring harness.
STEP 9. Measure the voltage at input shaft speed
sensor connector B-112.
(1) Disconnect the connector, and measure the
voltage between terminal 3 and earth at the
wiring harness side.
(2) Turn the ignition switch to the ON position.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 12.
NO :
Go to Step 10.
AC302452
Battery tray
B-112 (B)
Harness side
Connector: B-112
AG
AC311284
Connector: C-112 <LHD>
Connector: C-112 <RHD>
Harness side
Engine-A/T-ECU
C-112 (GR)
C-112 (GR)
Engine-A/T-ECU
AG
AC302452
Battery tray
B-112 (B)
Harness side
Connector: B-112
AG
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