Mitsubishi Galant (2004+). Manual — part 999
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-813
DTC P1021: Engine Oil Control Valve Circuit
1
2
3
4
1 2
MFI RELAY
B-17X
ENGINE OIL
CONTROL VALVE
POWERTRAIN CONTROL
MODULE (PCM)
1
2
4
1
2
128
3
Engine Oil Control Valve Circuit
BATTERY
B-23
B-33
MU802779
RED-
WHITE
RED-
WHITE
WHITE-RED
RED
AK303895
121 122 123 124 125 126 127
128 129 130 131 132 133
134 135 136 137 138 139 140
141 142 143 144 145 146
147 148 149 150 151 152 153
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-814
.
CIRCUIT OPERATION
• The engine oil control valve power is supplied
from the MFI relay (terminal No. 4).
• The PCM controls ground engine oil control valve
by turning the power transistor in the PCM "ON"
and "OFF".
.
TECHNICAL DESCRIPTION
• The engine oil control valve switches the cams to
operate the MIVEC system in the low-speed or
high-speed mode in accordance with the signals
from the PCM.
.
DTC SET CONDITIONS
Check Conditions
• Ignition switch: "ON"
• Battery positive voltage is higher than 10 volts.
• MIVEC operating in the low-speed mode.
Judgment Criteria
• The PCM terminal voltage of engine control valve
circuit is less than 1.5 volts for 2 seconds.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Engine oil control valve failed.
• Open or shorted engine oil control valve circuit, or
harness damage or connector damage.
• PCM failed.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
• MB991923: Power Plant ECU Check Harness
AK303896AB
CONNECTOR: B-33
ENGINE OIL
CONTROL VALVE
B-33 (B)
RADIATOR
UPPER HOSE
AK303803AB
CONNECTOR: B-17X
MFI RELAY
B-17X
AK303059
CONNECTOR: B-23
PCM
AB
AIR CLEANER
B-23
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-815
STEP 1. Check harness connector B-33 at the engine oil
control valve for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12.
STEP 2. Check the engine oil control valve.
(1) Disconnect the engine oil control valve connector B-33.
(2) Measure the resistance between engine oil control valve
side connector terminal No. 1 and No. 2.
Standard value: 6.9
− 7.9 ohms [at 20°C (68°F)]
Q: Is the measured resistance between 6.9 and 7.9 ohms
[at 20
°C (68°F)]?
YES : Go to Step 3.
NO : Replace the engine oil control valve. Then go to Step
12.
AK303897
1
2
AB
CONNECTOR: B-33
B-33 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
AK303897
1
2
AB
CONNECTOR: B-33
B-33 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
AK302152
1 2
AC
ENGINE OIL CONTROL
VALVE CONNECTOR
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-816
STEP 3. Measure the power supply voltage at engine oil
control valve harness side connector B-33.
(1) Disconnect the connector B-33 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 5.
NO : Go to Step 4.
STEP 4. Check harness connector B-17X at MFI relay for
damage.
Q: Is the harness connector in good condition?
YES : Repair harness wire between MFI relay connector
B-17X (terminal No. 4) and engine oil control valve
connector B-33 (terminal No. 1) because of open
circuit or short circuit to ground. Then go to Step 12.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12.
AK303897
1
2
AB
CONNECTOR: B-33
B-33 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
AK302157
B-33 HARNESS
CONNECTOR:
COMPONENT SIDE
AC
AK303806
2
1
3
4
AB
CONNECTOR: B-17X
B-17X
RELAY BOX
TRIANGLE
MARK
HARNESS CONNECTOR:
COMPONENT SIDE
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