MITSUBISHI TRITON 1997 Workshop Manual

MPI ± Troubleshooting13A-68
Terminal No. Normal condition (Check condition)Inspection item
4±12Stepper motor coil (A1)28 ± 33 W (At 20
C)
17 ± 12Stepper motor coil (A2)
5±12Stepper motor coil (B1)
18 ± 12Stepper motor coil (B2)
6±12EGR control solenoid valve36 ± 44 W (At 20
C)
9±12Purge control solenoid valve36 ± 44 W (At 20
C)
13 ± Body earthEngine-ECU earthContinuity (0W)
26 ±Body earthEngine-ECU earth
35 ± 12Oxygen sensor heaterApprox. 12 W (At 20
C)
52 ± 72Intake air temperature sensor5.3 ± 6.7 kW (When intake air temperature is 0
C)
2.3 ± 3.0 kW (When intake air temperature is 20
C)
1.0 ± 1.5 kW (When intake air temperature is 40
C)
0.30 ± 0.42 kW (When intake air temperature is 80
C)
63 ± 72Engine coolant temperature sensor5.1 ± 6.5 kW (When coolant temperature is 0
C)
2.1 ± 2.7 kW (When coolant temperature is 20
C)
0.9 ± 1.3 kW (When coolant temperature is 40
C)
0.26 ± 0.36 kW (When coolant temperature is 80
C)
67 ± 72Idle position switchContinuity (when throttle valve is at idle position)
No continuity (when throttle valve is slightly open)
71 ±Body earthInhibitor switch Continuity (when select lever is at P or N)
No continuity (when select lever is at D, 2, L or R)

S
pecia l p atte rn s P
atte rn h eig ht L
ow P
atte rn s e le cto r D
is p la y E
ngin e r /m in I
d le s p eed

S
pecia l p atte rn s P
atte rn h eig ht L
ow P
atte rn s e le cto r D
is p la y E
ngin e r /m in I
d le s p eed C
ra nk a ngle s e nso r S
pecia l
p atte rn s
p ic ku p A
naly ze r

C
ra nk a ngle
s e nso r o utp ut
w ave p atte rn (
V ) 7
5 B TD C
5 B TD C2
e ngin e r e vo lu tio n
( 1 c a m sh aft r e vo lu tio n)
The tim e ( c ycle tim e) T is
r e duce d w hen th e e ngin e
s p eed in cre ase s
T o p d ead
c e ntr e s e nso r
o utp ut w ave
p atte rn 8
5 45
T D C: T o p d ead c e ntr e No.1 T D C No.3 T D C No.4 T D C No.2 T D C T
im e
W ave P atte rn O bserv atio n P oin ts
C heck th at c ycle tim e T b eco m es s h orte r w hen th e e ngin e s p eed in cre ase s.
E xam ple s o f A bnorm al W ave P atte rn s

Exa m ple 1
C au se o f p ro ble m
S enso r in te rfa ce m alf u nctio n
W ave p atte rn c h ara cte ris tic s
R ecta ngula r w ave p atte rn is o utp ut e ve n w hen th e e ngin e
i s n ot s ta rte d.

Exa m ple 2
C au se o f p ro ble m
L oose tim in g b elt
A bnorm alit y in s e nso r d is k
W ave p atte rn c h ara cte ris tic s
W ave p atte rn is d is p la ce d to th e le ft o r r ig ht.

S
pecia l p atte rn s P
atte rn h eig ht V
aria ble V
aria ble k n ob A
dju st w hile v ie w in g th e w ave p atte rn P
atte rn s e le cto r D
is p la y E
ngin e r /m in I
d le s p eed S
pecia l
p atte rn s
p ic ku p A
naly ze r

P
ro bable c a use S
ole noid c o il b ack e le ctr o m otiv e fo rc e is lo w o r d oesn 't
a ppear a t a ll. S
hort in th e in je cto r s o le noid

S
pecia l p atte rn s P
atte rn h eig ht H
ig h P
atte rn s e le cto r D
is p la y E
ngin e c o ndit io n W
hen th e e ngin e c o ola nt te m pera tu re is 2 0
C o r b elo w , tu rn th e ig nit io n s w it c h fr o m O FF
t o O N ( w it h out s ta rtin g th e e ngin e). W
hile th e e ngin e is id lin g, tu rn th e A /C s w it c h to O N. I
m media te ly a fte r s ta rtin g th e w arm e ngin e ( a ppro x. 1 m in ute ) S
pecia l
p atte rn s
p ic ku p A
naly ze r

P
ro bable c a use I
n duce d e le ctr o m otiv e fo rc e d oes n ot a ppear o r is e xtr e m ely s m all. M
oto r is m alf u nctio nin g P
ro bable c a use C
oil r e ve rs e e le ctr o m otiv e fo rc e d oes n ot a ppear o r is e xtr e m ely s m all. S
hort in th e c o il

S
pecia l p atte rn s P
atte rn h eig ht L
ow P
atte rn s e le cto r D
is p la y E
ngin e r /m in A
ppro x. 1 ,2 00 r /m in O
FF ON
D well s e ctio n
Tim e
6
4
2
0
6
4
2
0 T
q

P
ro bable c a use R
is e s fr o m a ppro x. 2 V to a ppro x. 4 .5 V a t th e to p-rig ht N
orm al 2
V r e cta ngula r w ave O
pen-c ir c u it in ig nit io n p rim ary c ir c u it R
ecta ngula r w ave a t p ow er v o lt a ge P
ow er tr a nsis to r m alf u nctio n V
B
-
-- N orm al w ave p atte rn