Mitsubishi Grandis. Manual — part 791
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-5
SPECIAL TOOL
M1172000600361
TROUBLESHOOTING
DIAGNOSIS TROUBLESHOOTING FLOW
M1172002000332
Refer to GROUP 00 - How to Use
Troubleshooting/Inspection Service Points
DIAGNOSIS FUNCTION
M1172002100340
METHOD OF READING THE DIAGNOSIS
CODE
Use the MUT-III to read the diagnosis code (Refer to
GROUP 00
− How to Use
Troubleshooting/Inspection Service Points
Tool
Number
Name
Use
MB991955
A: MB991824
B: MB991827
C: MB991910
D: MB991911
E: MB991825
F: MB991826
MUT-III
sub-assembly
A: Vehicle
Communicati
on Interface
(V. C. I.)
B: MUT-III USB
cable
C: MUT-III main
harness A
(Vehicles with
CAN
communicatio
n system)
D: MUT-III main
harness B
(Vehicles
without CAN
communicatio
n system)
E: MUT-III
measurement
adapter
F: MUT-III
trigger
harness
Reading diagnosis code
CAUTION
MUT-III main harness A should
be used. MUT-III main harness B
should not be used for this
vehicle. If you connect MUT-III
main harness B instead, the CAN
communication does not
function correctly.
MB991658
Test harness
Inspection of data list
MB991910
MB991826
MB991955
MB991911
MB991824
MB991827
MB991825
A
B
C
D
E
F
DO NOT USED
MB991658
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-6
METHOD OF ERASING THE DIAGNOSIS
CODE
Use the MUT-III to erase the diagnosis code (Refer
to GROUP 00
− How to Use
Troubleshooting/Inspection Service Points
CHECK CHART FOR DIAGNOSIS CODES
M1172002200358
Code No.
Diagnosis item
Reference page
15
Auto-cruise control switch system
21
Cancel latch signal system
22
Stop lamp switch system <L.H. drive vehicles>
Stop lamp switch system <R.H. drive vehicles>
23
Engine-ECU <M/T> or engine-A/T-ECU <A/T> and
its related components
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-7
DIAGNOSTIC TROUBLE CODE
PROCEDURES
Code No.15 Auto-cruise Control Switch System
OPERATION
This circuit judges the signals of each switch (SET,
RESUME and CANCEL) of the auto-cruise control
switch. The engine-ECU <M/T> or engine-A/T-ECU
<A/T> detects the state of the auto-cruise control
switch by sensing the voltages shown below.
• When all switches are OFF: 4.7 − 5.0 volts
• When the MAIN switch is ON: 0 − 0.3 volt
• When the SET switch is ON: 2.0 − 2.8 volts
• When the RESUME switch is ON: 3.3 − 4.1 volts
• When the CANCEL switch is ON: 0.8 − 1.5 volts
DIAGNOSIS CODE SET CONDITIONS
If the auto-cruise control switch is operated, this
diagnosis code will be set when the engine-ECU
<M/T> or engine-A/T-ECU <A/T> terminal voltage is
different from the standard value.
AC311228
Auto-cruise
control switch
Clock
spring
Auto-cruise control switch system circuit
Engine-ECU <M/T> or engine-A/T-ECU <A/T>
C-114
C-113
C-17
C-310
C-311
C-304
C-305
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
G
B
B
B-W
V-W
V-W
V-R
V-R
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-8
POSSIBLE CAUSES
• Malfunction of the auto-cruise control switch.
• Malfunction of the clock spring.
• Damaged harness or connector.
• Malfunction of the engine-ECU <M/T>.
• Malfunction of the engine-A/T-ECU <A/T>.
DIAGNOSIS
STEP 1. MUT-III data list
• Item 01: Main switch (Refer to data list reference
• Item 02: Set switch (Refer to data list reference
• Item 03: Resume switch (Refer to data list
reference table
).
• Item 04: Cancel switch (Refer to data list
reference table
).
Q: Is the check result normal?
YES :
Go to Step 17.
NO :
Go to Step 2.
STEP 2. Measure the voltage at auto-cruise
control switch connector C-305.
(1) Remove the air bag module (driver’s side) (Refer
to GROUP 52B, Driver’s, Front Passenger’s Air
Bag Module(s) and Clock Spring
).
(2) Connect the negative (
−) battery cable.
(3) Turn the ignition switch to the "ON" position and
the MAIN switch to the "OFF" position.
(4) Measure the voltage between connector C-305
terminal No.2 and earth.
OK: 4.7
−5.0 V
(5) Turn the ignition switch to the "LOCK" (OFF)
position.
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Go to Step 3.
AC311366
Connector: C-305
<L.H. drive vehicles>
<R.H. drive vehicles>
C-305 (Y)
C-305 (Y)
AC
Clock
spring
Clock
spring
1 2 3
AC205053AI
C-305 harness
connector:
harness side
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