Mitsubishi 380. Manual — part 342
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-36
DIAGNOSIS
Required Special Tools:
• MB991958: Diagnostic ToolDiagnostic Tool (MUT-III Sub
Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
• MB991223: Harness Set
• MB992044: ENGINE-ECU Check Harness
STEP 1. 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 14.
NO : Go to Step 2.
STEP 2. Check the stoplamp operation.
Check the stoplamp operation.
• When the brake pedal is depressed, the stoplamp will
illuminate.
• When the brake pedal is released, the stoplamp does
not illuminate.
Q: Does the stoplamp illuminate (when the brake pedal is
depressed) and the stoplamp does not illuminate (when
the brake pedal is released)?
YES : Go to Step 3.
NO : Go to Step 6.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-37
STEP 3. 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 18 (Engine ECU connector B-21
terminal 18) 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 13.
NO : Go to Step 4.
10DB133A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-38
STEP 4. 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 5.
NO : Repair or replace the damaged components. (Refer to
GROUP 00E, Harness Connector Inspection
10DB133A
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
17-39
STEP 5. Check the harness wire between Engine ECU
connector B-21 terminal 18 and stoplamp switch
connector C-30 terminal 1 for damage.
Q: Is the harness wire in good condition?
YES : Go to Step 13.
NO : Repair the damaged harness wire if possible, or as
recommended, replace complete wiring 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
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