13A-11
MPI – TROUBLESHOOTING
Check connector B-33
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Check connectors B-19X & C-23
Inspect the harness between the
intake cam position sensor and
the engine control relay, repair if
necessary
• Check if the power supply wire
is cut or has short circuited
Measurements taken at engine
ECU connector C-50
• Measurement of voltage at
engine ECU terminals
• Undo the B-33 intake cam
position sensor connector
• Ignition switch: ON
•Voltage across earth 53
OK: 4.9~5.1V
Check connector C-50
Check connector C-49
Inspect the harness between the
intake cam position sensor and
the engine ECU
• Check if the earth wire is cut or
damaged
Harness inspection between the
intake cam position sensor and
the engine ECU
• Check if the earth wire is cut or
damaged
Replace the engine ECU
Replace engine ECU
Check that the problem has been
solved
Check that the problem has been
solved
Check connector C-50
Inspect the harness between the
intake cam position sensor and
the engine ECU, repair if
necessary
• Check if the output wire is cut
Temporary malfunction (Ref
Section 00: Dealing with
temporary malfunctions)
Temporary malfunction (Ref
Section 00: Dealing with
temporary malfunctions)
Measurements taken at the B-33
connector of the intake cam
position sensor
• Undo the connector and take
measurements using the
harness
(1) Voltage across earth at 3
(ignition switch: ON)
OK: battery voltage
(2) Voltage across earth at 2
(ignition switch: ON)
OK: 4.9~5.1V
(3) Resistance across earth at 1
OK: Less than 2Ω
Code No.P1012 Intake cam position sensor system Probable cause of the malfunction
Conditions for inspection
• With engine cranking or running
Evaluation conditions
• Sensor output voltage does not change for 4 seconds (with no input of
pulse signals)
• Malfunction of the intake cam position sensor
• Broken circuit or short circuit in the intake
cam position sensor circuit, or poor
connector contact
• Malfunction of engine ECU
OK
OK
NG
(1) NG
(2) NG
(3) NG
OK
NG
NG
OK
OK
OK
NG
NG
NG
OK
NG
OK
OK
NG
NG
OK
OK
NG
Repair
Repair
Repair
Repair
Repair
Repair
Repair
