General Precautions of EFI System Maintenance
F-44
Malfunction Diagnostic Guide:
Required Equipment: (Diagnostic Instrument with EOBD Diagnostic Function, Digital Multimeter, and
Correct Circuit Diagram)
Step I: Use diagnostic instrument to read the malfunction information
Read Result I Read Result II
MIL Lamp On P-CODE Present MIL Lamp Off P-CODE Present
P0268
P0268
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) The circuit connected to Pin 47# of ECU and the
134 main relay circuit in short circuit
2) The circuit connected to Pin 47# of ECU and
other power supply circuit in short circuit
Maintenance tips:
The malfunction is not ultimately confirmed and it
may possibly be a random malfunction. Inspect the
following items:
1) The circuit connected to Pin 47# of ECU and the
134 main relay circuit in short circuit
2) The circuit connected to Pin 47# of ECU and
other power supply circuit in short circuit
55. P0300 Multi-Cylinder Misfire
Description about Malfunction Cause:
Misfire indicates that the engine fails to release effective ignition energy (malfunction of ignition) in the
cylinder due to the ignition system arising from deviation in fuel injection volume (deviation in concentration
of mixed gas), too low cylinder compressed pressure, or any other factors, leading to the interruption or
malfunction of combustion in the burning process inside the cylinder, which will give rise to emission over
standard, or damage of catalytic converter due to over heat. As for OBD diagnostic test, when the frequency
of misfire exceeds the set value, the system will generally determine misfire malfunction.
Related Malfunction Symptoms:
1. Idling Jitter
2. Weak Acceleration
3. Increased Fuel Consumption
4. Emission over Standard
Malfunction Diagnostic Guide:
Required Equipment: (Diagnostic Instrument with EOBD Diagnostic Function, Digital Multimeter, and
Correct Circuit Diagram)
Main relay
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