General Precautions of EFI System Maintenance
F-38
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
P0123 P0123
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) The circuit between the Pin 38# and the Pin 32#
of ECU in short circuit
2) The Pin 38# of ECU and the 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 electric resistance between the Pin 38# and
the Pin 32# of ECU
2) The voltage of the Pin 38# of ECU
47. P0261 1st-Cylinder Fuel Injector Control Circuit Short to Ground
Description about Malfunction Cause:
After engine has been started, the circuit voltage is to be measured by the drive module of fuel injector inside
ECU, and when the voltage complies with the voltage in the mode of short to ground, it is determined to be
the malfunction of circuit short to ground.
Schematic Circuit:
1
-Cylidner Fuel
Injector
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