Mitsubishi Grandis. Manual — part 802
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-49
INSPECTION PROCEDURE 8: When the auto-cruise control MAIN switch is turned ON, the auto-cruise
control indicator lamp does not illuminate. (However, the auto-cruise control system is normal).
Combination
meter
C-02
Daytime
dipper
button
Dipper
circuit
CPU
Front-ECU
(Tail lamp relay)
Relay box
J/C (5)
J/C (CAN1)
J/C (CAN2)
Auto-cruise control indicator lamp drive circuit
C-202
C-205
G-W
C-125
C-125
C-09
A-07
A-16
C-112
C-31
G-W
Ignition switch (IG1)
J/B
B-W
L-B
G-W
B
B
R-L
R-L
R-L
B-L
B-L
R
R
B
B
B-L
NOTE
:
L.H. drive vehicles
:
R.H. drive vehicles
AC311469
Engine-ECU <M/T> or
engine-A/T-ECU <A/T>
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
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-50
CIRCUIT OPERATION
The engine-ECU <M/T> or engine-A/T-ECU <A/T>
detects MAIN switch "ON" signal to illuminate the
auto-cruise control indicator lamp on the combination
meter.
COMMENT
Connector(s), wiring harness in the CAN bus line
between the engine-ECU <M/T> or engine-A/T-ECU
<A/T> and the combination meter, power supply to
the engine-ECU <M/T> or engine-A/T-ECU <A/T>,
the combination meter, the engine-ECU <M/T> or
engine-A/T-ECU <A/T> may be defective.
TROUBLESHOOTING HINTS
• Malfunction of the combination meter
• Malfunction of the connector.
• Malfunction of the harness.
• Malfunction of the engine-ECU <M/T>.
• Malfunction of the engine-A/T-ECU <A/T>.
DIAGNOSIS
STEP 1. MUT-III CAN bus diagnosis
• Using MUT-III, perform CAN busline diagnosis.
Q: Is the check result satisfactory?
YES :
Go to Step 2
NO :
Repair the CAN bus lines (Refer to GROUP
54D, Diagnosis-Can Bus Diagnostic Chart
). Then go to Step 4 .
STEP 2. MUT-III MPI diagnosis
• Using MUT-III, perform MPI diagnosis.
Q: Is diagnosis code U1108 set?
YES :
Refer to GROUP 13A, MPI Diagnosis -
Code No U1108: Combination Meter
Time-Out
. Then go to Step 4 .
NO :
Go to Step 3 .
STEP 3. Retest the system.
Q: Does the auto-cruise control indicator lamp
illuminate when the MAIN switch is turned "ON"?
YES :
It can be assumed that this malfunction is
intermittent.
NO :
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T> (Refer to GROUP
13A, Engine-ECU and Engine-A/T-ECU
STEP 4. Retest the system.
Q: Does the auto-cruise control indicator lamp
illuminate when the MAIN switch is turned "ON"?
YES :
The procedure is complete.
NO :
Return to Step 1 .
DATA LIST REFERENCE TABLE
M1172002400396
Item No.
Check item
Check condition
Normal condition
01
Auto-cruise
control
switch
MAIN
MAIN switch: ON
ON
MAIN switch: OFF
OFF
02
SET/COA
ST
MAIN switch: ON
SET switch: ON
ON
SET switch: OFF
OFF
03
RESUME/
ACCELER
ATING
RESUME switch: ON
ON
RESUME switch: OFF
OFF
04
CANCEL
CANCEL switch: ON
ON
CANCEL switch: OFF
OFF
05
Stop lamp switch (for
stop lamp circuit)
Brake pedal: Depressed
ON
Brake pedal: Released
OFF
06
Stop lamp switch (for
auto-cruise control
circuit)
Brake pedal: Depressed
ON
Brake pedal: Released
OFF
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-51
07
Clutch switch <M/T>
Clutch pedal: Depressed
ON
Clutch pedal: Released
OFF
Inhibitor switch <A/T>
Selector lever: N or P position
ON
Selector lever: Other than N or P position
OFF
08
Accelerator switch (Idle
switch)
Accelerator pedal: Depressed
OFF
Accelerator pedal: Released
ON
09
Auto-cruise control
operation
Auto-cruise control: active
ON
Auto-cruise control: Inactive
OFF
10
Vehicle speed signal
Road test the vehicle
The speedometer and
MUT-III display the
same value.
11
Throttle position sensor
(main)
• Remove the
intake air hose
at the throttle
body
• Disconnect the
throttle position
sensor, and then
connect terminal
numbers No. 3,
No. 4, No. 5 and
No. 6 with the
use of the
special tool:
MB991658.
• Ignition switch:
ON
Fully close the throttle
valve with your finger
300
− 700 mV
Fully open the throttle
valve with your finger
4,000 mV or more
No load
500
− 700 mV
Shift lever: "N"
→ "D" <A/ T>
Voltage rises
12
Accelerator pedal
position sensor (main)
Ignition switch: ON Accelerator pedal:
Released
800
− 1,200 mV
Accelerator pedal:
Depressed
Increases in response
to the pedal
depression stroke
Accelerator pedal: Fully
depressed
4,000 mV or more
13
Cancel code
Ignition switch: "ON"
The cancel code,
which set when the
auto-cruise control
system was cancelled
at the last time, is set
again.
Item No.
Check item
Check condition
Normal condition
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-52
CHECK AT ECU TERMINAL
M1172002700342
AC312498
C-110
C-111
C-112
C-113
C-114
AB
Terminal
No.
Check item
Check conditions
Normal
condition
15
Throttle valve control
servo relay
Ignition switch: "ON"
System voltage
Running at 3,500 r/min while engine is warming up
after having been started.
1 V or less
39
Stop lamp switch
Ignition
switch: "ON"
Depress the brake pedal.
System voltage
Release the brake pedal.
1 V or less
40
Clutch switch <M/T>
Ignition
switch: "ON"
Depress the clutch pedal.
System voltage
Release the clutch pedal.
1 V or less
51
Inhibitor switch
<A/T>: "P" and "N"
Ignition
switch: "ON"
Select lever: N or P range
System voltage
Select lever: Other than N or P range 1 V or less
54
Brake switch
Ignition
switch: "ON"
Depress the brake pedal.
System voltage
Release the brake pedal.
1 V or less
57
Engine control relay
Ignition switch: "ON"
1 V or less
Ignition switch: "LOCK" (OFF)
System voltage
58
Engine-ECU <M/T>
or Engine-A/T-ECU
<A/T> backup power
supply
Ignition switch: "LOCK" (OFF)
System voltage
92
Accelerator pedal
position sensor
(main) power supply
Ignition switch: "ON"
4.9
− 5.1 V
94
Auto-cruise control
switch power supply
Ignition
switch: "ON"
All switches: OFF
4.7
− 5.0 V
"CRUISE" (MAIN) switch: "ON"
0
− 0.3 V
"COAST/SET" switch: ON
2.0
− 2.8 V
"ACC/RES" switch: ON
3.3
− 4.1 V
"CANCEL" switch: ON
0.8
− 1.5 V
97
Sensor impressed
voltage
Ignition switch: "ON"
4.9
− 5.1 V
106
Throttle position
sensor power supply
Ignition switch: "ON"
4.9
− 5.1 V
107
Accelerator pedal
position sensor (sub)
Ignition
switch: "ON"
Release the accelerator pedal
0.4
− 1.0 V
Depress the accelerator pedal.
3.6 V or more
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