Mitsubishi 3000GT Service Manual page 77

ENGINE - On-vehicle Service
check the crankshaft position sensor by reference to
GROUP 13A - On-vehicle Inspection of MFI Components.
(12)Disconnect the jumper wire connected at step (8).
(13)Check to be sure that the idling ignition timing is the
correct timing.
Actual ignition timing: Approx. 15" BTDC
NOTE
(1) Ignition timing is variable within about *7", even under
normal operating.
(2) And it is automatically further advanced by about
CURB IDLE SPEED CHECK
(1) The vehicle should be prepared as follows before the
inspection.
l Engine coolant temperature: 80-95°C (176-203°F)
Lights, electric cooling fan and accessories: OFF
l
Transaxle: neutral (P for A/T)
l
(2) Connect a tachometer. (Refer to P.ll-9.)
(3) Set a timing light.
(4) Using a jumper wire, ground the ignition timing adjusting
terminal.
(5) Start the engine and let it idle.
(6) Check the ignition timing is the standard value; if not,
adjust.
Standard value:
NOTE
Check the ignition timing with the scan tool not connected
to the data link connector.
(7) Remove the jumper wire from the ignition timing adjusting
terminal.
(8) When using the scan tool, turn OFF the ignition switch
and connect the tester to the data link connector.
(9) Idle the engine for two minutes.
(10)Check the idle speed.
Curb idle speed: 700 f 100 rpm
NOTE
(1) The idling speed is automatically regulated by the
idle-speed control system.
(2) The engine speed indicated is a third of actual speed.
In other words, the reading of the tachometer times
3 is actual speed.
GROUP 13A - Chart Classified by Problem Symptoms,
and check the MFI components.
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