Mitsubishi Lancer Evolution 7. Manual — part 204
MPI -
Troubleshooting
13A-115
Terminal No.
Normal condition (Check condition)
Inspection item
3- 12
Fuel pressure control solenoid valve
28 - 36 Ω (at 20_C)
4- 12
Stepper motor coil (A1)
28 - 33 Ω (at 20_C)
17- 12
Stepper motor coil (A2)
5- 12
Stepper motor coil (B1)
18- 12
Stepper motor coil (B2)
6- 12
EGR control solenoid valve
36 - 44 Ω (at 20_C)
9- 12
Purge control solenoid valve
22 - 26 Ω (at 20_C)
11- 12
Waste gate solenoid valve
62 - 74 Ω (at 20_C)
13- Body earth
ENGINE-ECU earth
Continuity (0Ω)
26-Body earth
ENGINE-ECU earth
53- 12
Secondary air control solenoid valve
28 - 36 Ω (at 20_C)
54- 12
Oxygen sensor heater (Rear)
11 - 18 Ω (at 20_C)
60- 12
Oxygen sensor heater (Front)
4.5 - 8.0 Ω (at 20_C)
72- 92
Intake air temperature sensor
13 - 17 kΩ (When intake air temperature is -20_C)
5.7 - 6.7 kΩ (When intake air temperature is 0_C)
2.3 - 3.0 kΩ (When intake air temperature is 20_C)
1.0 - 1.5 kΩ (When intake air temperature is 40_C)
0.56 - 0.76 kΩ (When intake air temperature is 60_C)
0.30 - 0.42 kΩ (When intake air temperature is 80_C)
83- 92
Engine coolant temperature sensor
14 - 17 kΩ (When coolant temperature is -20_C)
5.1 - 6.5 kΩ (When coolant temperature is 0_C)
2.1 - 2.7 kΩ (When coolant temperature is 20_C)
0.9 - 1.3 kΩ (When coolant temperature is 40_C)
0.48 - 0.68 kΩ (When coolant temperature is 60_C)
0.26- 0.36 kΩ (When coolant temperature is 80_C)
MPI -
Troubleshooting
13A-116
INSPECTION PROCEDURE USING AN
ANALYZER
AIR FLOW SENSOR
Measurement Method
1. Disconnect the air flow sensor connector, and connect
the special tool (test harness: MB991709) in between.
(All terminals should be connected.)
2. Connect the analyzer special patterns pickup to air flow
sensor connector terminal No. 3.
Alternate Method (Test harness not available)
1. Connect the analyzer special patterns pickup to
engine-ECU terminal No. 65.
Standard Wave Pattern
Observation conditions
Function
Special patterns
Pattern height
Low
Pattern selector
Display
Engine r/min
Idle speed
Standard wave pattern
(V)
10
0
The time (cycle time) T is reduced when
the amount of intake air increases.
Times T1 and T2 are equal.
Time
T
T1
T2
Observation conditions (from conditions above engine speed is increased by racing.)
Time
(V)
10
0
T
Wave Pattern Observation Points
Check that cycle time T becomes shorter and the frequency increases when the engine speed is increased.
Analyzer
Special
patterns
pickup
MPI -
Troubleshooting
13A-117
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
Damaged rectifier or vortex generation column
Wave pattern characteristics
Unstable wave pattern with non-uniform frequency.
However, when an ignition leak occurs during acceleration,
the wave pattern will be distorted temporarily, even if the air
flow sensor is normal.
CAMSHAFT POSITION SENSOR AND CRANK ANGLE
SENSOR
Measurement Method
1. Disconnect the camshaft position sensor connector and
connect the special tool (test harness: MB991709) in
between. (All terminals should be connected.)
2. Connect the analyzer special patterns pickup to camshaft
position sensor terminal No. 2.
3. Disconnect the crank angle sensor connector and connect
the special tool (test harness: MD998478) in between.
4. Connect the analyzer special patterns pickup to crank
angle sensor terminal No. 2.
Alternate Method (Test harness not available)
1. Connect the analyzer special patterns pickup to
engine-ECU terminal No. 88. (When checking the
camshaft position sensor signal wave pattern.)
2. Connect the analyzer special patterns pickup to
engine-ECU terminal No. 89. (When checking the crank
angle sensor signal wave pattern.)
Crank angle
sensor connector
Camshaft position sensor
connector
Analyzer
Special patterns
pick-up
MPI -
Troubleshooting
13A-118
Standard Wave Pattern
Observation condition
Function
Special patterns
Pattern height
Low
Pattern selector
Display
Engine r/min
Idle speed
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 position
sensor output
wave pattern
TDC: Top dead centre
131_ 49_
No. 1 TDC
No. 3 TDC
No. 4 TDC
No. 2 TDC
Time
0
56_ 34_
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.
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