Mitsubishi 3000GT Service Manual page 138

MULTIPORT FUEL INJECTION - Troubleshooting
OBD-II DRIVE CYCLE
All kinds of diagnostic trouble code can be monitored by carrying out a short drive in accordance with
the following drive cycle pattern. In other words, doing such a drive allows to regenerate any kind of
trouble which involves illuminating the check engine/malfunction indicator lamp and to check if the repair
procedure has eliminated the trouble (the check engine/malfunction indicator lamp is no more illumir$ed).
NOTE
1. For checking the following three systems for illumination of the check engine/malfunction indicator
lamp, perform the driving up to the point B twice successively. Before beginning with the first driving,
turn off the ignition switch for more than 10 seconds.
EGR system
l
Fuel trim
l
Evaporative emission control system
l
2. In case of the systems other than those three mentioned above, performing a drive up to the point
A twice successively will suffice for determining if the check engine/malfunction indicator lamp illuminates
or not. Before beginning with the first driving, turn off the ignition switch for more than 10 seconds.
3. Perform test drives under the following conditions:
(1) On vehicles with automatic transmission, set selector lever in D range, overdrive switch ON,
Power/Economy changeover switch in P range.
(2) Acceleration: Keep the throttle in l/4-3/4 opened conditions.
(3) Deceleration: Lower the vehicle speed below 15 mph or the engine speed below 1,000 r/min
(without operating brake and clutch).
(4) During cruising: Keep the throttle opening constant.
(5) During stopping: Keep the throttle fully closed, A/C OFF and transmission in neutral.
(6) Coolant temperature at starting: 10% (50°F) or more
(7) Intake air temperature at starting: 40°C (104OF) or more
(8) Intake air temperature during driving: 50°C (122"F)or more
Drive cycle pattern
E
H
F
G
H
I
H
K
L
M
H
0 H
H
H
Catalytic converter
Misfire
EGR system
MDP sensor
Fuel trim
Evapo. emission control system
,
H
H
H
J:
K:
L:
M: CTP switch
N:
0:
Q:
TSB Revision
,
ECT sensor
TP sensor, IAT sensor, BAR0 sensor
Injector circuit (open)
Solenoid valve circuit (open)
TC waste gate, EGR, EVAP purge, Fuel pressure
l
CMP sensor, CKP sensor, VAF sensor
Excessive time to enter closed loop fuel control
1
H