General Precautions of EFI System Maintenance
F-72
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
P0629
P0629
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) The circuit connected to Pin 70# of ECU and the
circuit of Pin 30# for fuel pump relay in short
circuit
2) The circuit connected to Pin 70# of ECU and the
circuit of Pin 86# for fuel pump relay in short
circuit
3) The circuit connected to Pin 70# 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) Measure whether or not the voltage for Pin 70#
of ECU is under normal condition
2) Measure the electric resistance between Pin 70#
of ECU and Pins 30# and 86# of Relay
92. P0645 Control Circuit of A/C Compressor Relay in Open Circuit
Description about Malfunction Cause:
After engine has been started, circuit control module of ECU examines voltage of A/C compressor relay
control circuit. If open mode value is detected, malfunction of open A/C compressor relay control circuit is
indicated.
Schematic Circuit:
Malfunction Diagnostic Guide:
Required Equipment: (Diagnostic Instrument with EOBD Diagnostic Function, Digital Multimeter, and
Correct Circuit Diagram)
Battery
Main relay
Relay
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