MITSUBISHI MONTERO 1998 Service Manual

Fig. 25: Identifying Cruise Control Circuit Connector Terminals:
Closed Throttle Switch & Throttle Position Sensor Connector
Courtesy of Mitsubishi Motor Sales of America
INSPECTION PROCEDURES FOR TROUBLE SHOOTING SYMPTOMS
Test No. 1
Defect in power supply system (including ground) for
diagnostic line may be possible. Probable causes are:
* Malfunction of connector.
* Malfunction of harness.
1) Check voltage between data link connector pin No. 16 and
ground. See Fig. 35. If battery voltage is present, go to next step.
If battery voltage is not present, check junction block connectors C-
81 and C-94. See Figs. 19, 21, 26 and 27. If connectors are defective,
repair as necessary. If connectors are okay and malfunction remains,
check harness between power supply and data link connector. Repair as
necessary.
2) At data link connector, measure continuity between pin No.
4 and ground and pin No. 5 and ground. If continuity is present,
replace scan tool. If continuity is not present, check data link
connector for damage or loose connections. Repair as necessary. If
connector is okay and malfunction remains, check harness between data
link connector and ground. Repair as necessary.

Fig. 26: Identifying Junction Block Connectors & Joint Connectors:
Junction Block (Front)
Courtesy of Mitsubishi Motor Sales of America

Fig. 27: Identifying Junction Block Connectors & Joint Connectors:
Junction Block (Rear)
Courtesy of Mitsubishi Motor Sales of America

Fig. 28: Identifying Junction Block Connectors & Joint Connectors:
Joint Connector C-130
Courtesy of Mitsubishi Motor Sales of America
Fig. 29: Identifying Junction Block Connectors & Joint Connectors:
Joint Connector C-131
Courtesy of Mitsubishi Motor Sales of America

Fig. 30: Identifying Junction Block Connectors & Joint Connectors:
Joint Connector C-132
Courtesy of Mitsubishi Motor Sales of America
Test No. 2
Malfunction of cruise control main switch or cruise control
ECU ground circuit may be present. Probable causes are:
* Malfunction of cruise control main switch.
* Malfunction of connector.
* Malfunction of harness.
* Malfunction of cruise control ECU.
1) Check cruise control main switch. See
CRUISE CONTROL SWITCH TESTS under COMPONENT TESTS. If switch is okay,
go to next step. If switch is defective, repair or replace as
necessary.
2) Disconnect main switch connector C-01. See Fig. 8. At
harness side of connector, measure voltage between connector terminal
No. 1 and ground. If battery voltage is present, go to next step. If
battery voltage is not present, check condition of junction block
connectors C-94 and C-101. If connector(s) are defective, repair as
necessary. If connectors are okay and malfunction remains, check
harness between cruise control main switch and power supply. Repair as
necessary.
3) Check condition of cruise control main switch connector C-
01, joint connector C-132 and cruise control ECU connector C-50.
Repair as necessary. If connectors are okay and malfunction remains,
check harness between cruise control main switch and ground, and
between main switch and cruise control ECU. Repair as necessary.
4) Disconnect cruise control ECU connector C-50. See Fig. 13.
Check for continuity between ground and connector terminals No. 6, 8,
and 14. If continuity is present, go to next step. If continuity is
not present, check condition of connectors between front wiring

harness, dash wiring harness and joint connector C-132. Repair as
necessary. If malfunction remains, check harness between cruise
control main switch and power supply. Repair as necessary.
5) Check condition of cruise control ECU connector C-50.
Repair as necessary. If connector is okay and malfunction persists,
replace cruise control ECU.
Test No. 3
Malfunction of cruise control main switch or cruise control
ECU ground circuit may be present. Probable causes are:
* Malfunction of cruise control main switch.
* Malfunction of clockspring.
* Malfunction of connector.
* Malfunction of harness.
1) Check cruise control switches. See
CRUISE CONTROL SWITCH TESTS under COMPONENT TESTS. Replace any failed
switch. If switches are okay, check clockspring. See CLOCKSPRING TEST
under COMPONENT TESTS. If clockspring is okay, go to next step.
Replace clockspring if not okay.
2) Disconnect clockspring connector C-128 and measure voltage
between terminal No. 2 and ground. See Fig. 15. If battery voltage is
present, go to next step. If battery voltage is not present, check
condition of IOD connector A-09X, joint connector C-131, junction
block connector C-81, junction block connector C-94 and junction block
connector C-101. Repair as necessary. See Figs. 4, 16, 19, 21, 22, 26,
27 and 29. If connectors are okay and malfunction remains, check
harness between clockspring and power supply. Repair as necessary.
3) Check condition of cruise control ECU connector C-50 and
clockspring connector C-128. Repair as necessary. See Figs. 13 and 15.
If connectors are okay and malfunction remains, check harness between
clockspring and cruise control ECU. Repair as necessary.
Test No. 4
Malfunction of stoplight switch or stoplight circuit may be
present. Probable causes are:
* Malfunction of stoplight switch.
* Malfunction of connector.
* Malfunction of harness.
* Malfunction of cruise control ECU.
1) If stoplight does not illuminate with brake pedal
depressed, go to next step. If stoplight illuminates with pedal
depressed, replace cruise control ECU.
2) Check stoplight switch. See
BRAKELIGHT/STOPLIGHT SWITCH TEST under COMPONENT TESTS. Replace
stoplight switch as necessary. If stoplight switch is okay, go to next
step.
3) Disconnect stoplight switch connector C-55. See Fig. 14.
At harness side of connector, measure voltage between terminal No. 2
and ground. If battery voltage is present, go to next step. If battery
voltage is not present, check condition of joint connector C-131 and
junction block connector C-94. Repair as necessary. See Fig. 26. If
connectors are okay and malfunction remains, check harness between
stoplight switch and power supply. Repair as necessary.
4) Check condition of cruise control ECU connector C-50 and
stoplight switch connector C-55. Repair as necessary. If connectors
are okay and malfunction remains, check harness between stoplight
switch and cruise control ECU. Repair as necessary.
Test No. 5

An open circuit in output signal circuit in Neutral range is
likely reason for malfunction. Probable causes are:
* Malfunction of park/neutral switch.
* Malfunction of connector.
* Malfunction of harness.
* Malfunction of cruise control ECU.
Check condition of park/neutral switch connector B-08, dash
harness/transmission harness connector C-124, cruise control ECU
connector C-50 and joint connector C-130. Repair as necessary. If
connectors are okay and malfunction remains, check harness between
park/neutral switch and cruise control ECU. Repair as necessary. If
harness is okay, replace cruise control ECU.
Test No. 6
An open circuit in circuit inside CANCEL switch is likely
caused by a malfunction in cruise control switch. Replace cruise
control switch.
Test No. 7
Because of an open circuit in battery back-up circuit system,
fail-safe function prevents diagnostic trouble codes from being
memorized and displayed even though cruise control is canceled.
Probable causes are:
* Malfunction of connector.
* Malfunction of harness.
* Malfunction of cruise control ECU.
1) Disconnect cruise control ECU connector C-50. See Fig. 13.
At harness side of connector, measure voltage between terminal No. 16
and ground. If battery voltage is present, go to next step. If battery
voltage is not present, check and repair IOD connector A-09X, joint
connector C-132, junction block connector C-81 and junction block
connector C-93 as necessary. See Figs. 4, 16, 19, 20, 26 and 30. If
connectors are okay and malfunction remains, check harness between
cruise control ECU and power supply. Repair as necessary.
2) Check condition of cruise control ECU connector C-50.
Repair as necessary. If connector is okay and malfunction remains,
replace cruise control ECU.
Test No. 8
A malfunction of switches or fail-safe function cancelling
cruise control may be present. Probable causes are:
* Malfunction of cruise control main switch.
* Malfunction of cruise control switch.
* Malfunction of clockspring.
* Malfunction of harnesses or connectors.
* Malfunction of park/neutral position switch.
* Malfunction of cruise control ECU.
1) Attach scan tool to DLC. If scan tool can communicate with
cruise control, go to next step. If scan tool cannot communicate with
cruise control, go to TEST NO. 2.
2) If input switch inspection is possible with scan tool, go
to next step. If input switch inspection is not possible, go to TEST
NO. 3.
3) If input switch Code 21, 22 or 27 are still displayed,
replace cruise control main switch. If codes are no longer displayed,
go to next step.
4) If input switch Code 23 is still displayed, go to TEST NO.

13. If input switch Code 26 is still displayed, go to TEST NO. 14. If
codes are no longer displayed, replace cruise control ECU.
Test No. 9
A malfunction of Vehicle Speed Sensor (VSS) or incorrect
vacuum in cruise control vacuum pump or actuator may be present.
Probable causes are:
* Malfunction of VSS.
* Malfunction of cruise control vacuum pump.
* Malfunction of actuator.
* Malfunction of cruise control ECU.
1) Check vehicle speed sensor. See VEHICLE SPEED SENSOR TEST
under COMPONENT TESTS. If speed sensor is okay, go to next step. If
speed sensor is defective, replace VSS.
2) Check cruise control vacuum pump. See VACUUM PUMP TEST
under COMPONENT TESTS. If pump is defective, replace pump. If pump is
okay, go to next step.
3) Check actuator. See ACTUATOR TEST under COMPONENT TESTS.
If actuator is defective, replace actuator. If actuator is okay,
replace cruise control ECU.
Test No. 10
A blown bulb in cruise control main switch or malfunction of
cruise control main switch is probable cause of malfunction. Replace
cruise control main switch.
Test No. 11
A malfunction of cruise control main switch, harness or
connector may exist. Probable causes are:
* Malfunction of cruise control main switch.
* Malfunction of connector.
* Malfunction of harness.
1) Check cruise control main switch. See
CRUISE CONTROL SWITCH TESTS under COMPONENT TESTS. If switch is okay,
go to next step. If switch is defective, replace cruise control main
switch.
2) Disconnect cruise control main switch connector C-01. At
harness side of connector, measure voltage between terminal No. 2 and
ground. If battery voltage is present, go to next step. If battery
voltage is not present, check joint connector C-130 and junction block
connector C-80. Repair as necessary. See Figs. 16, 18, 26 and 28. If
connectors are okay and malfunction remains, check harness between
cruise control main switch and power supply. Repair as necessary.
3) Check cruise control main switch connector C-01,
combination meter connector C-04, and joint connector C-130. Repair as
necessary. See Figs. 8, 9, 16 and 28. If connectors are okay and
malfunction remains, check harness between cruise control main switch
and dash lights rheostat. Repair as necessary.
Test No. 12
A malfunction of bulb, connector or harness may exist.
Probable causes are:
* Malfunction of bulb.
* Malfunction of connector.
* Malfunction of harness.
* Malfunction of cruise control ECU.
1) Perform cruise control indicator test. See

CRUISE CONTROL INDICATOR TEST under COMPONENT TESTS. If cruise control
indicator is defective, replace indicator. If indicator checks okay,
go to next step.
2) If cruise control indicator illuminates when cruise
control connector C-50 terminal No. 23 is grounded at harness side,
replace cruise control ECU. If indicator does not illuminate, check
combination meter connector C-12 and cruise control ECU connector C-
50. Repair as necessary. If connectors are okay and malfunction
remains, check harness between combination meter and cruise control
ECU. Repair as necessary.
Test No. 13
1) Perform stoplight switch test. See
BRAKELIGHT/STOPLIGHT SWITCH TEST under COMPONENT TESTS. If switch is
okay, go to next step. If switch is defective, replace brakelight
switch.
2) Check cruise control ECU connector C-50, stoplight switch
connector C-55 and joint connector C-131. Repair as necessary. See
Figs. 13 , 14, 16 and 29. If connectors are okay and malfunction
remains, check harness between joint connector C-131 and cruise
control ECU.
Test No. 14 (A/T)
1) Perform park/neutral switch test. See
PARK/NEUTRAL SWITCH TEST under COMPONENT TESTS. If switch is okay, go
to next step. If switch is defective, replace switch.
2) Check starter relay. Replace if defective. If relay is
okay, check cruise control ECU connector C-50 and joint connector C-
130. Repair as necessary. See Figs. 13, 16 and 28. If connectors are
okay and malfunction remains, check harness between cruise control ECU
and power supply.
COMPONENT TESTS
ACTUATOR TEST
Remove actuator. Apply vacuum to actuator. Actuator linkage
holder should move more than 1.38" (35 mm). Actuator diaphragm should
hold vacuum. Replace actuator if actuator does not test as specified.
BRAKELIGHT/STOPLIGHT SWITCH TEST
Disconnect stoplight switch connector C-55. When brake pedal
is pressed, continuity should be present between terminals No. 2 and
3. See Fig. 14. When brake pedal is released, continuity should be
present between terminals No. 1 and 4. Replace switch if it does not
test as specified.
CLOCKSPRING TEST
WARNING: Deactivate air bag system before performing any service
operation. See AIR BAG RESTRAINT SYSTEMS article. Do not
apply electrical power to any component on steering column
without first deactivating air bag system. Air bag may
deploy.
If clockspring fails any check, replace with a NEW
clockspring.
1) Check connectors and protective tube for damage and
deformities.
2) Visually check case for damage or deformities.

3) Continuity should be present between:
* Connector No. 1, terminal No. 1 and connector No. 4,
terminal No. 2.
* Connector No. 1, terminal No. 2 and connector No. 4,
terminal No. 1.
* Connector No. 1, terminal No. 3 and connector No. 3.
See Fig. 31.
4) Align paint mark on SRS connector No. 4 with notch in
clockspring connector No. 2 and join connectors. See Fig. 32. Using a
DVOM, check for continuity between terminals No. 22 and 23 at SRS Test
Harness (MB991613) connector No. 5.
Fig. 31: Identifying Clockspring Connectors
Courtesy of Mitsubishi Motor Sales of America