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-09

A-07

A-16

C-112

C-31

G-W

Ignition switch (IG1)

J/B

B-W

L-B

G-W

R-L

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

P.54D-16

). 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

P.13A-276

. 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

P.13A-399

). Then go to Step 4 .

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

Auto-cruise
control
switch

MAIN

MAIN switch: ON

MAIN switch: OFF

OFF

SET/COA
ST

MAIN switch: ON

SET switch: ON

SET switch: OFF

OFF

RESUME/
ACCELER
ATING

RESUME switch: ON

RESUME switch: OFF

OFF

CANCEL

CANCEL switch: ON

CANCEL switch: OFF

OFF

Stop lamp switch (for
stop lamp circuit)

Brake pedal: Depressed

Brake pedal: Released

OFF

Stop lamp switch (for
auto-cruise control
circuit)

Brake pedal: Depressed

Brake pedal: Released

OFF

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-51

Clutch switch <M/T>

Clutch pedal: Depressed

Clutch pedal: Released

OFF

Inhibitor switch <A/T>

Selector lever: N or P position

Selector lever: Other than N or P position

OFF

Accelerator switch (Idle
switch)

Accelerator pedal: Depressed

OFF

Accelerator pedal: Released

Auto-cruise control
operation

Auto-cruise control: active

Auto-cruise control: Inactive

OFF

Vehicle speed signal

Road test the vehicle

The speedometer and
MUT-III display the
same value.

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:

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

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

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

Terminal
No.

Check item

Check conditions

Normal
condition

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

Stop lamp switch

Ignition
switch: "ON"

Depress the brake pedal.

System voltage

Release the brake pedal.

1 V or less

Clutch switch <M/T>

Ignition
switch: "ON"

Depress the clutch pedal.

System voltage

Release the clutch pedal.

1 V or less

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

Brake switch

Ignition
switch: "ON"

Depress the brake pedal.

System voltage

Release the brake pedal.

1 V or less

Engine control relay

Ignition switch: "ON"

1 V or less

Ignition switch: "LOCK" (OFF)

System voltage

Engine-ECU <M/T>
or Engine-A/T-ECU
<A/T> backup power
supply

Ignition switch: "LOCK" (OFF)

System voltage

Accelerator pedal
position sensor
(main) power supply

Ignition switch: "ON"

4.9

− 5.1 V

Auto-cruise control
switch power supply

Ignition
switch: "ON"

All switches: OFF

4.7

− 5.0 V

"CRUISE" (MAIN) switch: "ON"

− 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

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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