Page 465 of 2053

M161 ENGINE CONTROLS 1F2 -- 47
D AEW OO M Y_2000
KAB1F460
Failure
CodeDescriptionTrouble AreaMaintenance Hint
72No. 1 injector short
circuit to battery
When malfunction of injector
circuit
Injector #1 short circuit to
powerDInspection the power to injector #1 or
bad contact
DInspection the injector
DInspection the ECM
73No. 1 injector short
circuit to ground or open
When malfunction of injector
circuit
Injector #1 short circuit to
ground or openDInspection the ECM pin 63 about short
circuit or open with bad contact
DInspection the injector
DInspection the ECM
74No. 2 injector short
circuit to battery
When malfunction of injector
circuit
Injector #2 short circuit to
powerDInspection the power to injector #2 or
bad contact
DInspection the injector
DInspection the ECM
75No. 2 injector short
circuit to ground or open
When malfunction of injector
circuit
Injector #2 short circuit to
ground or openDInspection the ECM pin 64 about short
circuit or open with bad contact
DInspection the injector
DInspection the ECM
76No. 3 injector short
circuit to battery
When malfunction of injector
circuit
Injector #3 short circuit to
powerDInspection the power to injector #3 or
bad contact
DInspection the injector
DInspection the ECM
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1F2 -- 48 M161 ENGINE CONTROLS
D AEW OO M Y_2000
Failure
CodeDescriptionTrouble AreaMaintenance Hint
77No. 3 injector short
circuit to ground or open
When malfunction of injector
circuit
Injector #3 short circuit to
ground or openDInspection the ECM pin 65 about short
circuit or open with bad contact
DInspection the injector
DInspection the ECM
78No. 4 injector short
circuit to battery
When malfunction of injector
circuit
Injector #4 short circuit to
powerDInspection the power to injector #4 or
bad contact
DInspection the injector
DInspection the ECM
79No. 4 injector short
circuit to ground or open
When malfunction of injector
circuit
Injector #4 short circuit to
ground or openDInspection the ECM pin 66 about short
circuit or open with bad contact
DInspection the injector
DInspection the ECM
YAA1F420YAA1F430
Injector Spray Pattern Check
1. Turn the ignition switch OFF.
2. Remove the fuel injector connectors.
3. Remove the fuel distributor and injector with a unit. At this time, do not remove the supply and return line.
Notice:Prepare the beaker for taking the fuel.
4. Connect the shop made cable to the injector with a firing order.
5. Connect the other end of shop made cable to the positive battery cable and negative battery cable.
6. Turn the ignition switch ON.
7. Check the injector for normal spray pattern as shown in the figure. Check injector for leaks or later drop
Injector Resistance Inspection
1. Turn the ignition switch OFF.
2. Remove the fuel injector connectors.
3. Measure the fuel injector coil resistance using a multimeter.
Specified Value
14 ~ 17Ω
Notice:Replace the fuel injector if the measured value is out of the specified values. Check the connector and wire
connection between the ECM and the injector if the measured values are normal.
Page 467 of 2053
M161 ENGINE CONTROLS 1F2 -- 49
D AEW OO M Y_2000
Injector Pulse Width Inspection
1. Turn the ignition switch OFF.
2. Install the scan tool.
3. Turn the ignition switch ON.
4. Monitor the “INJECTION TIME” with a scan tool.
Cranking
8.0 ms
Engine Idle3~5ms
Wide Open Throttle (WOT)14 ms
Page 468 of 2053
1F2 -- 50 M161 ENGINE CONTROLS
D AEW OO M Y_2000
PURGE CONTROL VALVE
YAA1F440
The fuel vaporization control system is installed to inhibit the fuel vaporized gas from discharging into the atmosphere.
The fuel vaporized gas that is accumulated in the canister abstracts through the purge control valve purification during
the engine combustion (except the decreasing mode) and coolant temperature of over 80°C. For this reason, the En-
gine Control Module (ECM) transacts the engine speed, air inflow quantity, coolant temperature, and intake tempera-
ture.
The purge control valve is activated by the ECM frequency according with the engine rotating speed to adjust the
purification rate. The purification rate is determined by the continuous valve opening interval.
The purge control valve is activated by the ECM for the following conditions:
DCoolant temperature of over 80°C
DEngine speed of over 1,000 rpm
D2 minutes after starting
DWhen the fuel cut -- off mode is not activated
Page 469 of 2053

M161 ENGINE CONTROLS 1F2 -- 51
D AEW OO M Y_2000
KAB1F230
Failure
CodeDescriptionTrouble AreaMaintenance Hint
40Purge control valve
short circuit to batteryWhen short circuit to power
sourceDInspection the ECM pin 34 about short
circuitoropenwithbadcontact
41
Purge control valve
short circuit to ground or
openWhen short circuit to ground or
open
circuitor open withbadcontact
DInspection the source power of valve
DInspection the purge control solenoid
vale
54Purge control circuit
malfunctionWhen malfunction of purge
control : not workvale
DInspection the ECM
Test
YAA1F460
1. Maintain the normal temperature and idling state by
operating the engine.
2. Connect the ECM terminal No. 11 and No. 34 and
check for normal operation through the output waves
using oscilloscope.Notice:Test during purge control valve operation after
the minimum of 1 minute after the engine turned on.
3. Connect the ECM terminal No. 34 and No.10 and
check for current consumption during the ignition
switch ON.
Specified Value
0.3 ~ 0.5 A
4. Remove the line to canister and measure the pres-
sure with the vacuum pressure gauge.
Specified Value
> 500 mbar
(after approx. 1 min.)
purge control valve operates
at this time
Notice:Test while at normal temperature and at idling
state by operating the engine.
Page 470 of 2053
1F2 -- 52 M161 ENGINE CONTROLS
D AEW OO M Y_2000
FUEL RAIL
YAA1F0E0
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M161 ENGINE CONTROLS 1F2 -- 53
D AEW OO M Y_2000
Fuel Pressure Test
Tools Required
103 589 00 21 00 Fuel Pressure Gauge
1. Turn the ignition switch to “OFF” position.
2. Remove the fuel pressure test connector.
YAA1F700
3. Connect the fuel pressure gauge to the fuel pressure test connector.
4. Test the fuel pressure at idling by operating the engine using the fuel pressure gauge 103 589 00 21 00.
Vacuum Hose Connected (bar)
3.2~3.6
Vacuum Hose Disconnected (bar)3.7~4.2
5. Replace the pressure regulator diaphragm if out of the specification.
Internal Leakage Test
1. Connect the fuel pressure gauge 103 589 00 21 00 to
the fuel pressure test connector.
YAA1F0K0
2. Stop the engine for approximately 30 minutes and then check the fuel pressure changes.
Pressure change
Fuel pressure drops slowlyDFuel leakage at the injector
DFaulty fuel pressure regulator ’s diaphragm and O-ring
Fuel pressure drops rapidlyDFaulty check valve in the fuel pump
3. If there is no change in fuel pressure and maintain the following pressure over 30minutes, it is normal.
Fuel pressure (bar)
≥2.5
Page 472 of 2053

1F2 -- 54 M161 ENGINE CONTROLS
D AEW OO M Y_2000
FUEL PRESSURE REGULATOR
YA A 1 F0 F0
Function of the Fuel Pressure Regulator
The fuel pressure regulator maintains the fuel pressure
in the fuel line with the pressure of 3.2 bars to 3.8 bars
according to the intake manifold pressure. This operat-
ing pressure cannot be changed, and the fuel injection
volume will be only determined by the injection time.
Over supplied fuel returns to the fuel tank through the
return line.
There is no negative pressure applied to the spring
chamber (9) during the full load, and it is separated from
the fuel chamber (8) by the diaphragm (5).
When the fuel pressure goes up, the diaphragm forces
the compression spring (6) in the direction of compres-
sion . At this moment, the valve (3) sticks to the dia-
phragm by the fuel pressure, and the fuel return line (2)
opens. The fuel over supplied returns to the fuel tank
through the return line.
YAA1F490
2. Fuel return line
3. Valve
5. Diaphragm
6. Compression Spring
8. Fuel Chamber
9. Spring Chamber
A. Valves Closed
B. Valves Opened