Mitsubishi Pajero Pinin. Manual — part 55
![](/vehicles/winoney/gatous/faminuwi/sdigis.png)
GDI –
Troubleshooting
13A-86
Standard wave pattern
Crank angle
sensor output
wave pattern
(V)
75
_
BTDC
2 engine revolutions
(1 camshaft revolution)
5
_
BTDC
The time (cycle time) T is
reduced when the engine
speed increases
0
Camshaft posi-
tion sensor out-
put wave pat-
tern
TDC: Top dead centre
No. 1
TDC
No. 3 TDC
No.
4
TDC
No. 2
TDC
Time
0
T
4
4
Wave Pattern Observation Points
Check that cycle time T becomes shorter when the engine speed increases.
Examples of Abnormal Wave Patterns
D
Example 1
Cause of problem
Sensor interface malfunction
Wave pattern characteristics
Rectangular wave pattern is output even when the engine
is not started.
D
Example 2
Cause of problem
Loose timing belt
Abnormality in sensor disk
Wave pattern characteristics
Wave pattern is displaced to the left or right.
![](/vehicles/winoney/gatous/faminuwi/ywng.png)
GDI –
Troubleshooting
13A-87
INJECTORS AND INJECTOR OPEN CIRCUIT CHECK
SIGNAL
Measurement Method
1.
Connect the analyzer special patterns pickup to terminal
1 (No.1 injector) of the engine-ECU connector.
2.
Connect the analyzer special patterns pickup to terminal
96 (injector open circuit check signal) of the engine-ECU
connector.
3.
After checking terminal 1, check terminal 9 (No.2 injector),
terminal 24 (No.3 injector) and terminal 2 (No.4 injector).
Standard Wave Pattern
Observation conditions
Function
Special pattern
Pattern height
Low
Pattern selector
Display
Engine r/min
Idle speed
Standard wave pattern
4
0
8
4
0
(V)
Injector
open circuit
check+
signal
Injector
drive signal
(ms)
Wave Pattern Observation Points
D
Check that the injector drive time is identical to the time
displayed on the MUT-
II
.
D
Check that the injector signals become greatly extended
but soon return to their normal wave length when the
engine is suddenly raced.
D
Check that the injector open circuit check signal is
synchronized with each rising portion of the injector drive
signal.
Special patterns
pickup
Analyzer
Normal wave
pattern
![](/vehicles/winoney/gatous/faminuwi/wacopirouril.png)
GDI –
Troubleshooting
13A-88
IGNITION COIL AND POWER TRANSISTOR
Power transistor control signal
Measurement Method
1.
Disconnect the ignition coil connector, and connect the
special tool (test harness: MB991658) in between. (All
terminals should be connected.)
2.
Connect the analyzer special patterns pickup to terminal
3 of each ignition coil connector in turn.
Alternate Method (Test harness not available)
1.
Connect the analyzer special patterns pickup to
engine-ECU terminal 3 (No. 1 ignition coil), terminal 13
(No. 2 ignition coil), terminal 12(No. 3 ignition coil), terminal
4 (No. 4 ignition coil) respectively.
Standard Wave Pattern
Observation condition
Function
Special patterns
Pattern height
Low
Pattern selector
Display
Engine r/min
Approx. 1,200 r/min
Standard wave pattern
Crank angle
sensor output
wave pattern
Power transistor
control signal
wave pattern
(V)
Compression top dead center
θ
: Spark advance angle
Ignition period
OFF
Dwell section
Time
θ
T
4
0
0
T: Crank angle
T1
ON
T1: Time calculated by engine-ECU
Special
patterns
pickup
Analyzer
![](/vehicles/winoney/gatous/faminuwi/mun.png)
GDI –
Troubleshooting
13A-89
Wave Pattern Observation Points
Point:
Condition of wave pattern build-up section and maximum voltage (Refer to abnormal wave pattern
examples 1 and 2.)
Condition of wave pattern build-up section and maximum voltage
Probable cause
Rises from approx. 2V to approx. 4.5V at the top-right
Normal
2V rectangular wave
Open-circuit in ignition primary circuit
Rectangular wave at power voltage
Power transistor malfunction
Examples of Abnormal Wave Patterns
D
Example 1
Wave pattern during engine cranking
Cause of problem
Open-circuit in ignition primary circuit
Wave pattern characteristics
Top-right part of the build-up section cannot be seen, and
voltage value is approximately 2V too low.
D
Example 2
Wave pattern during engine cranking
Cause of problem
Malfunction in power transistor
Wave pattern characteristics
Power voltage results when the power transistor is ON.
--- Normal wave pattern
2V
V
B
--- Normal wave pattern
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст