2000 MITSUBISHI MONTERO Service Repair Manual

DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-47
Terminal
No.Normal condition: Inspection conditions (engine status) Check item
21A/C relayA/C switch: OFF→ONSystem voltage→0-1
V
31Idle switchIgnition switch: ONRelease the foot from the
accelerator pedal.0-1V
Step on the accelerator
pedal slightly3 V or higher
32A/C switchA/C in operation (compressor in operation)System voltage
36Selector switch
between A/T and M/TIgnition switch: ONSystem voltage (M/T)
46Control relayIgnition switch: ON0-1V
Ignition switch: ON→OFF (in about 8 seconds)System voltage
51Pump speed sensorEngine: Idling (Use a digital voltage meter to check.)0V↔5V
(repeat the change)
55Accelerator pedal
position sensor (sub)Ignition switch: ONAccelerator pedal: Idling
position0.9 - 1.1 V
Accelerator pedal: Fully
opened position3.7 V or higher
60Sensor power supplyIgnition switch: ON4.6 - 5.4 V
71Ignition switch-STEngine: Cranking8 V or higher
80Back-up power supplyIgnition switch: OFFSystem voltage
81Power supply to accel-
erator pedal position
sensor (main)Ignition switch: ON4.6 - 5.4 V
82Ignition switch-IGIgnition switch: ONSystem voltage
83Engine coolant tem-
perature sensorIgnition switch: ONEngine coolant
temperature: 0_C3.7 - 4.3 V
Engine coolant
temperature: 20_C2.8 - 3.4 V
Engine coolant
temperature: 40_C1.9 - 2.5 V
Engine coolant
temperature: 80_C0.6 - 1.2 V
84Accelerator pedal posi-
tion sensor (main)Ignition switch: ONAccelerator pedal: Idling
position0.9 - 1.1 V
Accelerator pedal: Fully
opened position3.7 V or higher
85Boost pressure sensorIgnition switch: ON (101 kPa)1.0 - 1.4 V
86Vehicle speed sensorDIgnition switch: ON
DMove the vehicle forward slowly0V↔8 - 12 V
(repeat the change)
87Fuel temperature sen-
sor
Ignition switch: ONFuel temperature: 0_C3.2 - 3.6 V
sorFuel temperature: 20_C2.3 - 2.7 V
Fuel temperature: 40_C1.5 - 1.9 V
Fuel temperature: 80_C0.4 - 0.8 V


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-48
Terminal
No.Normal condition: Inspection conditions (engine status) Check item
88Boost air temperature
sensorIgnition switch: ONIntake air temperature:
0_C3.2 - 3.8 V
Intake air temperature:
20_C2.3 - 2.9 V
Intake air temperature:
40_C1.4 - 2.0 V
Intake air temperature:
80_C0.4 - 1.0 V
89Crank angle sensorEngine: Idling (Use a digital voltage meter to check.)0V↔5V
(repeat the change)
90EGR valve position
sensor
Engine: After warm-
inguptheengine
Idling under no load2.3 - 3.3 V
sensoring up the engineEngine is suddenly racedMomentarily drops from
voltage during idling
91Parking switchIgnition switch: ON
(Enginestops)
Parking brake: ON0-1V
(Engine stops)Parking brake: OFFSystem voltage
CHECK CHART FOR RESISTANCE AND CONTINUITY
BETWEEN TERMINALS
1. Turn the ignition switch to LOCK (OFF) position.
2. Disconnect the engine-ECU connector.
3. Measure the resistance and check for continuity between
the terminals of the engine-ECU harness-side connector
while referring to the check chart.
NOTE
(1) When measuring resistance and checking continuity,
a harness for checking contact pin pressure should
be used instead of inserting a test probe.
(2) Checking need not be carried out in the order given
in the chart.
Caution
If the terminals that should be checked are mistaken,
or if connector terminals are not correctly shorted
to earth, damage may be caused to the vehicle wiring,
sensors, engine-ECU and/or ohmmeter.
Be careful to prevent this!
4. If the ohmmeter shows any deviation from the standard
value, check the corresponding sensor, actuator and
related electrical wiring, and then repair or replace.
5. After repair or replacement, recheck with the ohmmeter
to confirm that the repair or replacement has corrected
the problem.


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I
n sp ectio n it e m N
orm alc o ndit io n (C heck co ndit io n) 1
-15 G
E actu ato r 0
.6 4 -0.7 2 Ω F
×e↔c × t s→ ↔e n→id va ↔v e 6
.8 -9.2 Ω T
im in g c→ nt± → ↔v a ↔v e 1
0.8 -11 .2 Ω E
G R c→ nt± → ↔s → ↔e n→id va ↔v e N→.2 3
6 -44 Ω (a t 20_C ) 9
-12 E
G R co ntr o ls o le noid va lv e No.1 3
6 -44 Ω (a t 20_C ) 1
3 -B ody earth E
ngin e-E C U earth C
ontin uit y (0 Ω) 2
6 -B ody earth 1
4 -12 T
hro ttle so le noid va lv e 2
9 -35 Ω (a t 20_C ) 3
1 -61 I
d le sw it c h C
ontin uit y (R epla ce th e fo ot fr o m th e acce le ra to r
p edal) N
o co ntin uit y (w hen acce le ra to r pedal is fu lly
d epre sse d) 5
1 -61 P
um psp eed se nso r 1
.3 6 -1.8 4 kΩ C
→nt± → ↔s ↔e eve p→sit i→ n se ns→ ± 5
.6 -6.2 Ω 5
.6 -6.2 Ω 1
1 .2 -12.4 Ω T
im e± pis t→ n p→sit i→ n se ns→ ± 1
60 -168 Ω 8
0 -84 Ω 8
0 -84 Ω

DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-50
Terminal No. Normal condition (Check condition)Inspection item
83 - 61Engine coolant temperature sensor5.1 - 6.5 kΩ(when the engine coolant temperature is
0_C)
2.1 - 2.7 kΩ(when the engine coolant temperature is
20_C)
0.9 - 1.3 kΩ(when the engine coolant temperature is
40_C)
0.26 - 0.36 kΩ(when the engine coolant temperature
is 80_C)
87 - 61Fuel temperature sensor5.1 - 6.5 kΩ(when the fuel temperature is 0_C)
2.1 - 2.7 kΩ(when the fuel temperature is 20_C)
0.9 - 1.3 kΩ(when the fuel temperature is 40_C)
0.26 - 0.36 kΩ(when the fuel temperature is 80_C)
88 - 61Boost air temperature sensor5.3 - 6.7 kΩ(when the intake air temperature is 0_C)
2.3 - 3.0 kΩ(when the intake air temperature is 20_C)
1.0 - 1.5 kΩ(when the intake air temperature is 40_C)
0.30 - 0.42 kΩ(when the intake air temperature is
80_C)


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P
ro be se le ct sw it c h T
IM E/D IV . 1
0 m s V
O LT S /D IV . 2
V A
C -G ND -DC D
C O
th er -
E
ngin e r/m in I
d le sp eed

B
TD C35 _ B
TD C9_
AT D C
1 2 _
T
E xp la n atio n of W ave Patte rn
T he cra nk angle se nso r dete cts th e ro ta tio n of a se nsin g pla te . Acco rd in gly , th e perio d T (s e co nds) ca n
b e measu re d and th e engin e sp eed ca n be ca lc u la te d fr o m th e fo llo w in g fo rm ula .
E ngin e sp eed (r/m in ) = 2
4 T (s e c) ×
60 = 3
0
T (s e c)
W ave Patte rn Observ atio n Poin ts
C heck th at cycle tim e T beco m es sh orte r and th e fr e quency in cre ase s when th e engin e sp eed is in cre ase d.
E xam ple s of Abnorm al W ave Patte rn s
D Exa m ple 1
C au se of pro ble m
S enso r in te rfa ce malf u nctio n
W ave patte rn ch ara cte ris tic s
R ecta ngula r w ave patte rn is outp ute ve n when th e engin e
i s not sta rte d.
D Exa m ple 2
C au se of pro ble m
A bnorm alit y in se nso r dis k
W ave patte rn ch ara cte ris tic s
W ave patte rn is dis p la ce d to th e le ft or rig ht.

P
ro be se le ct sw it c h S
eta cco rd in g to th e pro be. T
IM E/D IV . A
bout1 0 m se c V
O LT S /D IV . A
bout0 .5 V A
C -G ND -DC D
C E
ngin e r/m in I
d le sp eed

2
4 × T (s e c) ×
60
W ave Patte rn Observ atio n Poin ts
C heck th at cycle tim e T beco m es sh orte r and th e fr e quency in cre ase s when th e engin e sp eed is in cre ase d.
E xam ple s of Abnorm al W ave Patte rn s
D Exa m ple 1
C au se of pro ble m
M alf u nctio n or open cir c u it in se nso r
W ave patte rn ch ara cte ris tic s
N o sig nal is outp ut eve n when engin e is sta rte d.
D Exa m ple 2
C au se of pro ble m
I n co rre ct gap betw een se nso r and se nsin g gear pla te
W ave patte rn ch ara cte ris tic s
N o sig nalis outp ut eve n when engin e is sta rte d, or sig nal
a m plit u de is sm all.