13A-13
MPI – TROUBLESHOOTING
Replace the engine ECU
Check connectors B-19X & C-23
Check connector B-134
Check connectors B-19 & C-23
Check connector C-49
Check that the problem has been
solved
Inspect the oil feeder control
valve by itself (Ref: P13A-30)
Inspect the harness between the
engine control relay and the oil
feeder control valve, repair if
necessary
• Check for damage to the power
supply wire
Inspect the harness between the
engine control relay and the oil
feeder control valve, repair if
necessary
• Check if the power supply wire
is cut or has short circuited
Check connector C-49
Inspect the harness between the
engine ECU and the oil feeder
control valve, repair if necessary
• Check if the output wire is cut or
has short circuited
Temporary malfunction (Ref
Section 00: Dealing with
temporary malfunctions)
Replace the oil feeder control
valve
A-134 Measurement of the oil
feeder control valve
• Measure using a harness
connected to the connector
• Ignition switch: ON
•Voltage across earth at 1
OK: battery voltage
C-49 Measurement of engine
ECU
• Undo the connector and
measure on the harness side
• Ignition switch: ON
•Voltage across earth at 32
OK: battery voltage
Inspect the harness between the
engine ECU and the oil feeder
control valve
• Check for damage to the output
wire
OK
NG
OK
OK
OK
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
NG
NG
NG
NG
NG
OK
OK
Repair
Repair
Repair
Repair
Repair
Repair
Repair
Code No.P1021 Oil feeder control valve system Probable cause of the malfunction
Conditions for inspection
• Oil feeder control valve: OFF
Evaluation conditions
• Operational terminal voltage of the oil feeder control valve in the ECU is
abnormal for 4 seconds
• Malfunction of the oil feeder control
valve
• Broken circuit or short circuit in the oil
feeder control valve circuit, or poor
connector contact
• Malfunction of engine ECU
