1991 MITSUBISHI MONTERO Service Manual

CRUIS E C O NTR O L S YSTE M

1991 M it s u bis h i M onte ro
1991-92 SAFETY EQUIPMENT
Mitsubishi Cruise Control Systems
Montero
DESCRIPTION & OPERATION
The cruise control system is electronically and vacuum
controlled. System components include a control unit, actuator, vacuum
pump, cruise control switch, clutch pedal switch, cruise indicator
light, diode, inhibitor switch (A/T), stoplight switch, vehicle speed
sensor and A/T control unit.
The system has self-diagnostic capability. When
self-diagnostic mode is activated, each switch and sensor is checked
for defects. When cruise control system has been cancelled without
using a normal cancel method, a code will be set and stored in control
unit. Codes can be retrieved to help determine which circuit is
malfunctioning.
PRELIMINARY INSPECTION
Before performing TROUBLE SHOOTING steps, inspect linkage
assembly, actuator, cables and vacuum hoses. Ensure linkage and cables
move smoothly. Ensure cables do not have excessive slack or tension.
TROUBLE SHOOTING
NOTE: For further trouble shooting information, see CHECK RESULTS
& SYMPTOM CHARTS. See Figs. 11-16.
SYSTEM CANCELS OR WILL NOT RESET AFTER CANCELLATION
1) Check trouble codes, see SELF-DIAGNOSTICS under DIAGNOSIS
& TESTING. If no trouble codes are stored, ensure cruise control can
be set.
2) If cruise control can be set, system may have cancelled
because of driving on steep hills or loose wiring connection. If
cruise control still cannot be set, perform SYSTEM INPUT TESTS under
DIAGNOSIS & TESTING.
3) On 1991 models, if SYSTEM INPUT TESTS check okay, check
actuator circuit. See TEST NO. 5 under CIRCUIT TESTS (1991). On 1992
models, if SYSTEM INPUT TESTS check okay, check vacuum pump circuit.
See TEST NO. 6 under CIRCUIT TESTS (1992). On all models, if SYSTEM
INPUT TESTS do not check okay, see INPUT CODE CHART. See Fig. 9 or 10.
ADJUSTMENTS
CRUISE CONTROL CABLE
1991
1) Ensure cruise control and accelerator cables are free of
bends and folds. Remove actuator cover. Loosen lock nuts and adjusting
nuts to free cables. Adjust accelerator cable "A" to correct
dimension. See Fig. 1 or 2.
2) Tighten lock nuts. Loosen adjustment bolts on intake air
plenum. Adjust plate so that inner cable free play is .04-.08" (1-2

mm). Tighten adjustment plate bolts.
3) Ensure throttle link is touching fixed Speed Adjusting
Screw (SAS). With intermediate link "A" in contact with stopper,
tighten adjusting nut "A" in direction that reduces inner cable free
play. See Fig. 3.
4) Stop turning adjusting nut "A" just before intermediate
link "A" begins to move. Back off adjusting nut "A" 1/2 turn. Inner
cable free play should be 0-.04" (0-1 mm). Tighten lock nut. Ensure
the distance intermediate link "B" begins to move when selector of
actuator turns is 04-.08" (1-2 mm). See Fig. 4.
5) Press accelerator pedal to ensure intermediate links "A"
and "B" operate smoothly. Install actuator cover.
Fig. 1: Adjusting Cruise Control & Accelerator Cables (1991 - 1 Of 4)\
Courtesy of Mitsubishi Motor Co.

Fig. 2: Adjusting Cruise Control & Accelerator Cables (1991 - 2 Of 4)\
Courtesy of Mitsubishi Motor Co.
Fig. 3: Adjusting Cruise Control & Accelerator Cables (1991 - 3 Of 4)\
Courtesy of Mitsubishi Motor Co.

Fig. 4: Adjusting Cruise Control & Accelerator Cables (1991 - 4 Of 4)\
Courtesy of Mitsubishi Motor Co.
1992
Remove link protector. Loosen lock nut. Hold link "A" so that
it touches link "B". Adjust free play by turning adjusting nut until
free play is .04-.08" (1-2 mm). Tighten lock nut. See Fig. 5.
Fig. 5: Adjusting Cruise Control Cable (1992)
Courtesy of Mitsubishi Motor Co.
DIAGNOSIS & TESTING

CRUISE CONTROL SWITCH FUNCTION TEST
NOTE: If vehicle speed decreases approximately 9 MPH below set
speed, set speed will be cancelled.
1) Cruise control switch is part of multifunction switch
mounted on steering column. To operate cruise control system, turn
ignition on. Turn cruise control switch to ON position. Ensure switch
indicator light comes on.
NOTE: Speed will not set beyond system limit of 90 MPH.
2) With cruise control switch in ON position, drive vehicle
between 25 and 90 MPH. Press and release SET button. Vehicle speed
should stay at set speed. Instrument cluster cruise indicator light
should come on. To increase set speed, turn control switch to RESUME
position and hold until new set speed is reached.
3) To lower set speed, press SET button and hold until new
set speed is reached. To return to set speed after cancellation, move
resume switch from ON to OFF position. Vehicle speed should return to
previous setting before cancellation. Set speed should cancel when any
of the following occurs:
* Brake pedal is pressed.
* Clutch pedal is pressed.
* Transmission is shifted to Neutral or Park.
* Cruise control main switch is turned off.
* Ignition switch is turned off.
SELF-DIAGNOSTICS
1) Self-diagnostics should be performed when cruise control
cancels without the driver using normal cancel modes. Diagnosis
connector is located on right side of fuse box. Use analog voltmeter
or Multi-Use Tester (MB991341) for code retrieval.
2) Use multi-use tester according to operating instructions
provided with tester. Connect leads of analog voltmeter between cruise
control terminal and ground terminal of self-diagnostic connector. See
Fig. 6 . Read voltmeter needle sweeps to determine trouble code.
NOTE: On 1991 models, codes No. 13, 14, 15, 16 and 17 will be
displayed whether malfunction is present or not.
3) Once trouble codes have been displayed, see SELF-
DIAGNOSTIC CODE CHART to determine appropriate CIRCUIT TEST. See
Fig. 7 or 8.
4) To clear trouble codes, either disconnect battery cable or
turn ignition on. Turn main cruise control switch and set switch to ON
position. Within one second turn resume switch to ON position.
5) Hold stoplight switch and cruise control switch in ON
position for more than 5 seconds. Verify codes are cleared.
Fig. 6: Identifying Self-Diagnostic Connector Terminals
Courtesy of Mitsubishi Motor Co.

Fig. 7: 1991 Self-Diagnostic Code Chart
Courtesy of Mitsubishi Motor Co.
Fig. 8: 1992 Self-Diagnostic Code Chart
Courtesy of Mitsubishi Motor Co.
SYSTEM INPUT TESTS
1991
1) System input tests should be performed if no trouble codes
are stored when performing SELF-DIAGNOSTICS.

2) System input tests cycle each cruise control switch and
sensor. Use analog voltmeter or Multi-Use Tester (MB991341) for system\
input check. Use multi-use tester according to operating instructions
provided with tester. Connect leads of analog voltmeter between cruise
control terminal and ground terminal of self-diagnostic connector. See
Fig. 6.
3) Turn ignition on and check items No. 1-3 on INPUT CODE
CHART. See Fig. 9 0r 10. Start engine and check items No. 4 and 5 on
INPUT CODE CHART. To display results of each input check, press SET
switch while holding RESUME switch in ON position. Read codes. Codes
will display if circuit tested is okay.
1992
1) System input tests should be performed if no trouble codes
are stored when performing SELF-DIAGNOSTICS. System input tests cycle
each cruise control switch and sensor.
2) Use Multi-Use Tester (MB991341) for system input check.
Use multi-use tester according to operating instructions provided with
tester. Connect leads of analog voltmeter between cruise control
terminal and ground terminal of self-diagnostic connector. See Fig. 6.
Turn ignition switch to ON position. Follow INPUT CODE CHART sequence.
See Fig. 9 or 10.
3) To display results of input check, move SET switch to ON
position. Then turn MAIN switch to ON position. Within one second,
activate RESUME switch. Codes will display if circuit tested is okay.
Fig. 9: 1991 Input Code Chart
Courtesy of Mitsubishi Motor Co.

Fig. 10: 1992 Input Code Chart
Courtesy of Mitsubishi Motor Co.