Exhaust System - Mitsubishi 3000GT Service Manual

INTAKE AND EXHAUST - Troubleshooting (Active Exhaust System)
TROUBLESHOOTING PROCEDURE
(1) Make sure that the valve operating cable is not dislocated.
(2) Make sure that the connectors of each component are positively connected and that no fuse has
blown.
(3) Have an overall understanding of the substance and procedure of checking by reference to the Trouble-
shooting Quick-Reference Table and perform check in the proper sequence.
(4) Check each component with its connectors disconnected.
If no abnormality is found in all parts by the check performed in the following sequence, the problem
is probably caused by faulty active exhaust control unit and therefore the active exhaust control unit
is replaced.
Part to be
checked
1
Valve Operate valve
manually.
Active Refer to P.1540.
exhaust
switch
Power
3 Check continuity be- Continuity present
window tween terminals (1) and
relay
(3) of relay.
With battery voltage ap-
plied between terminals
(1) and (3) of relay,
check continuity be-
tween terminals (4) and
(5) of relay.
4 Actuator Check continuity be-
assembly tween
SPORT mode.
Check continuity be- Continuity present be-
tween terminals while
idling in TOUR mode.
Apply battery voltage
between terminals (1)
and (3).
5 Cable
Operate active exhaust
switch (while idling).

EXHAUST SYSTEM)

QUICK-REFERENCE TABLE
Checking Normal condition
procedure
Operates freely.
No continuity present
terminals in between terminals (2)
and (5).
Continuity present be-
tween terminals (5) and
tween terminals (2) and
(5).
No continuity present
between terminals (5)
and (6).
Motor operates.
Motor turns in reverse
direction when polarity
is reversed.
Actuator operates and
valve operates as well.
TSB Revision
Probable cause
Valve sticking Replace main muffler.
Faulty switch Replace switch.
Replace power window
Faulty power window
relay relay.
Replace actuator as-
Faulty actuator assem-
sembly.
Broken or maladjusted Replace or adjust cable.
cable
1
Remedy