Mitsubishi Grandis. Manual — part 845
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-47
Code No.26: Stop lamp switch system
OPERATION
The stop lamp switch judges whether the brake
pedal is depressed or released, and sends the
information to the engine-A/T-ECU.
DIAGNOSIS CODE SET CONDITIONS
If the stop lamp remains on for consecutively five
minutes or more while the vehicle is being driven or
all the stop lamp bulbs are blown, it is judged that
there is a short or open circuit in the stop lamp switch
and diagnosis code 26 is set.
POSSIBLE CAUSES
• Malfunction of brake pedal
• Malfunction of stop lamp switch
• Damaged harness wires and connectors
• Malfunction of the engine-A/T-ECU
DIAGNOSIS
STEP 1. Check that the stop lamps illuminate and
extinguish normally.
The stop lamps should illuminate when the brake
pedal is depressed, and extinguish when released.
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 2.
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
FUSIBLE
LINK
RELAY
BOX
STOP LAMP
SWITCH
ENGINE-
A/T-ECU
26
Stop lamp switch system circuit
<LHD>
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-48
STEP 2. Check the brake pedal height.
Refer to GROUP 35A
− On-vehicle Service, Brake
Pedal Check and Adjustment (Refer to
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Adjust the brake pedal height.
STEP 3. Check the stop lamp switch.
Refer to GROUP 35A
− Brake Pedal and Stop Lamp
Switch Continuity Check (Refer to
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Replace the stop lamp switch.
STEP 4. MUT-III data list
Item 26: Stop lamp switch (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 5.
STEP 5. Connector check: C-127 stop lamp
switch 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. Measure the voltage at stop lamp switch
connector C-127.
Disconnect the connector, and measure the voltage
between terminal No.2 and earth at the harness side.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 12.
STEP 7. Measure the voltage at engine-A/T-ECU
connector C-111.
(1) Connect stop lamp switch connector C-127.
(2) Measure the voltage between engine-A/T-ECU
connector C-111 terminal No.39 and earth.
OK:
Brake pedal depressed: System voltage
Brake pedal not depressed: 1 V or less
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Go to Step 10.
AC309520AD
Connector: C-127
Harness side
Brake pedal
4
3
2
1
AC309520AD
Connector: C-127
Harness side
Brake pedal
4
3
2
1
AC311284AH
Connector: C-111 <LHD>
Connector: C-111 <RHD>
Harness side
Engine-A/T-ECU
C-111 (GR)
C-111 (GR)
45
52
35
42 41
43
51
58
50
57
33
34
36
403938 37
47
55
48
56
44
49
46
54
3231
53
Engine-A/T-ECU
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-49
STEP 8. Connector check: C-111 engine-A/T-ECU
connector
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Repair the defective connector.
STEP 9. MUT-III data list
Item 26: Stop lamp switch (Refer to data list
reference 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.
AC311284AH
Connector: C-111 <LHD>
Connector: C-111 <RHD>
Harness side
Engine-A/T-ECU
C-111 (GR)
C-111 (GR)
45
52
35
42 41
43
51
58
50
57
33
34
36
403938 37
47
55
48
56
44
49
46
54
3231
53
Engine-A/T-ECU
TROUBLESHOOTING <A/T>
AUTOMATIC TRANSMISSION (FF)
23A-50
STEP 10. Connectors check: C-18 intermediate
connector, C-111 engine-A/T-ECU connector,
C-32 J/C (7) <LHD>
AC310615
AQ
Connector: C-18
<LHD>
C-18
2
6
1
5
9
3
7 8
10
4
AC310628
C-18
AC310628AT
Connector: C-18
<RHD>
C-18
2
6
1
5
9
3
7 8
10
4
AC311284AH
Connector: C-111 <LHD>
Connector: C-111 <RHD>
Harness side
Engine-A/T-ECU
C-111 (GR)
C-111 (GR)
45
52
35
42 41
43
51
58
50
57
33
34
36
403938 37
47
55
48
56
44
49
46
54
3231
53
Engine-A/T-ECU
AC310613
AY
Connector: C-32 <LHD>
C-32
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
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