Mitsubishi 380. Manual — part 426
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION
23A-244
INSPECTION PROCEDURE 12: No Diagnostic Trouble Codes (Does not Shift)
.
CIRCUIT OPERATION
A/T-ECU connector B-19 (terminal number 21)
receives battery positive voltage from the battery.
.
COMMENT
If shifting does not occur while driving and no diag-
nostic trouble codes are output, a malfunction of the
transmission inhibitor switch, or A/T-ECU may exist.
.
TROUBLESHOOTING HINTS (The most
likely causes for this condition:)
• Malfunction of the transmission inhibitor switch
• Damaged harness, connector
• Malfunction of the A/T-ECU
Circuit drawings
• Refer to circuit diagrams GROUP-
• Refer to configuration diagrams GROUP-
• Refer to component locations GROUP-
DIAGNOSIS
Required Special Tool:
• MB991958: Diagnostic Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
STEP 1. Check the vehicle acceleration.
Q: Does the vehicle accelerate poorly (transmission stays
in 3rd gear) when starting from a stop with the selector
lever in "D" range?
YES : Go to Step 2.
NO : Go to Step 5.
10DB125A
COVER
AIR
CLEANER
A/T
CONTROL
UNIT
CONNECTOR: B-19
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION
23A-245
STEP 2. Measure the backup power supply voltage at
A/T-ECU connector B-19 by using check harness special
tool MB992045.
(1) Disconnect all the connectors from the A/T-ECU.
(2) Connect special tool MB992045 (check harness) between
the A/T-ECU and the body-side harness connector.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between connector B-19 terminal 21
and ground.
• The voltage should measure battery positive voltage.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage battery positive voltage?
YES : Go to Step 5.
NO : Go to Step 3.
10DB125A
COVER
AIR
CLEANER
A/T
CONTROL
UNIT
CONNECTOR: B-19
10DB161A
A/T-ECU CHECK HARNESS
MB992045
A/T-ECU
A/T-ECU CHECK
HARNESS
CONNECTORS
10DB124A
B-19 HARNESS
CONNECTOR:
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION
23A-246
STEP 3. Check A/T-ECU connector B-19 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is the connector in good condition?
YES : Go to Step 4.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
. Then retest the system.
STEP 4. Check the harness for open circuit between
A/T-ECU connector B-19 terminal 21 and battery.
Q: Is the harness wire in good condition?
YES : Go to Step 5.
NO : Repair or replace the harness wire.
16DB564A
COVER
AIR
CLEANER
A/T
CONTROL
UNIT
CONNECTORS: B-19, B-22
10DB125A
COVER
AIR
CLEANER
A/T
CONTROL
UNIT
CONNECTOR: B-19
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION
23A-247
STEP 5. Using diagnostic tool MB991958, check data list
item 34: Inhibitor 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
connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set diagnostic tool MB991958 to the data reading mode.
• Item 34: Inhibitor Switch.
• Item 27: Sports mode select switch
• Item 28: Sports mode upshift switch
• Item 29: Sports mode downshift switch
• Move the selector lever positions and confirm that
the selected transmission range match the positions
shown on diagnostic tool MB991958.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the switch operating properly?
YES : Check for the symptom. If the symptom is not
eliminated, replace the A/T-ECU.
NO : Refer to
, (P0705): Transmission
Inhibitor Switch system, and refer to inspection
procedure 15 (Sports mode switch system)
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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