Mitsubishi 380. Manual — part 344
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-44
STEP 13. Using Diagnostic Tool MB991958, check data list
item 74: Stoplamp Switch.
CAUTION
To prevent damage to Diagnostic Tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting Diagnostic Tool
MB991958.
(1) Connect Diagnostic Tool MB991958 to the data link
(2) Turn the ignition switch to the "ON" position.
(3) Set Diagnostic Tool MB991958 to data reading mode for
auto-cruise control system. (Refer to
• Item 74, Stoplamp Switch.
• When the brake pedal is depressed, the display on
Diagnostic Tool MB991958 should be "ON".
• When the brake pedal is released, the display on
Diagnostic Tool MB991958 should be "OFF".
(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect Diagnostic Tool MB991958.
Q: Is the switch operating properly?
YES : Go to Step 21.
NO : Replace the Engine ECU. [Refer to GROUP 13A,
Engine ECU
STEP 14. Using Diagnostic Tool MB991958, check data list
item 89: Normally closed Brake Switch.
CAUTION
To prevent damage to Diagnostic Tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting Diagnostic Tool
MB991958.
(1) Connect Diagnostic Tool MB991958 to the data link
(2) Turn the ignition switch to the "ON" position.
(3) Set Diagnostic Tool MB991958 to data reading mode for
auto-cruise control system. (Refer to
• Item 89, Normally closed Brake Switch.
• When the brake pedal is depressed, the display on
Diagnostic Tool MB991958 should be "ON".
• When the brake pedal is released, the display on
Diagnostic Tool MB991958 should be "OFF".
(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect Diagnostic Tool MB991958.
Q: Is the switch operating properly?
YES : Go to Step 21.
NO : Go to Step 15.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-45
STEP 15. Measure the terminal voltage at Engine ECU
connector B-21.
(1) Disconnect all the connectors from the Engine ECU.
(2) Connect special tool MB992044 between the Engine ECU
and the body-side harness connector.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the terminal voltage between special tool 94-pin
connector terminal 21 (Engine ECU connector B-21
terminal 21) and ground.
• When the brake pedal is depressed, the voltage should
measure battery positive voltage (approximately 12
volts).
• When the brake pedal is released, the voltage should
measure 1 volt or less.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
(6) Disconnect special tool MB992044 between the Engine
ECU and the body-side harness connector.
(7) Reconnect all the connectors to the Engine ECU.
Q: Is the measured voltage battery positive voltage
(approximately 12 volts) when the brake pedal is
depressed and 1 volt or less when the brake pedal is
released?
YES : Go to Step 20.
NO : Go to Step 16.
STEP 16. Check the stoplamp switch.
(1) Remove the stoplamp switch. (Refer to GROUP 35A, Brake
Pedal
).
(2) Connect an ohmmeter to the stoplamp switch between
terminals 3 and 4.
(3) Check for continuity between the terminals when the
plunger of the stoplamp switch is pushed in and when it is
released.
(4) The stoplamp switch is operating properly if the circuit is
open between terminals 3 and 4 when the plunger is
pushed in, and if resistance value is less than 2 ohms
between terminals 3 and 4 when the plunger is released.
Q: Is the stoplamp switch operating properly?
YES : Install the stoplamp switch. (Refer to GROUP 35A,
Brake Pedal
). Then go to Step 17.
NO : Replace the stoplamp switch. (Refer to GROUP 35A,
Brake Pedal
). Then go to Step 22.
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
1
2
3
4
ACX01917AJ
C-30 STOPLIGHT SWITCH
CONNECTOR
AC205057
CONTINUITY
NO
CONTINUITY
4.5 mm (0.18 in)
AC
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-46
STEP 17. Check Engine ECU connector B-21 and stoplamp
switch connector C-30 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Are the connectors and terminals in good condition?
YES : Go to Step 18.
NO : Repair or replace the damaged components. (Refer to
GROUP 00E, Harness Connector Inspection
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
17DB045A
CONNECTOR: C-30
C-30
C-30 HARNESS
CONNECTOR:
COMPONENT SIDE
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-47
STEP 18. Check the harness wire between Engine ECU
connector B-21 terminal 21 and stoplamp switch
connector C-30 terminal 3 for damage.
Q: Is the harness wire in good condition?
YES : Go to Step 19.
NO : Repair the damaged harness wire if possible, or as
recommended, replace complete harness. Then go to
Step 22.
STEP 19. Check the harness wire between stoplamp
switch connector C-30 terminal 4 and ground for damage.
Q: Is the harness wire in good condition?
YES : Go to Step 20.
NO : Repair the damaged harness wire if possible, or as
recommended, replace complete harness. Then go to
Step 22.
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
17DB045A
CONNECTOR: C-30
C-30
C-30 HARNESS
CONNECTOR:
COMPONENT SIDE
16DB401A
ENGINE
ECU
GROUND
TERMINAL
RELAY BOX
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