General Precautions of EFI System Maintenance
F-73
Step I: Use diagnostic instrument to read the malfunction information
Read Result I Read Result II
SVS lamp On P-CODE Present SVS lamp Off P-CODE Present
P0645
P0645
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) Circuit between ECU Pin 69# and A/C
compressor relay Pin 85# is open.
2) Circuit between A/C compressor relay Pin 30#
and main relay is open.
3) Circuit between A/C compressor relay Pin 87#
and battery is open.
Maintenance tips:
The malfunction is not ultimately confirmed and it
may possibly be a random malfunction. Inspect the
following items:
1) Examine resistance of circuit between Pin 69#
of ECU connector and A/C compressor relay Pin
85#.
2) Examine resistance of circuit between A/C
compressor relay Pin 30# and main relay.
3) Examine resistance of circuit between A/C
compressor relay Pin 87# and battery.
93. P0646 Control Circuit of A/C Compressor Relay Short to Ground
Description about Malfunction Cause:
After engine has been started, the voltage of relay circuit is to be measured by circuit control module 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:
Battery
Main relay
A/C Compressor Relay
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