General Precautions of EFI System Maintenance
F-85
113. P1612 Communication Between Anti-theft Device and ECU Disconnected
Description about Malfunction Cause:
In the case when engine is not started if the key is placed at “ON”, the anti-theft device will send messages to
ECU for two times, and this malfunction will appear, when ECU has failed to receive the message from the
anti-theft device for the first time.
Schematic Circuit:
Malfunction Diagnostic Guide:
Required Equipment: (Diagnostic Instrument with EOBD Diagnostic Function)
Step I: Use diagnostic instrument to read the malfunction information
Read Result I Read Result II
SVS lamp flickers P-CODE Present SVS lamp Off P-CODE Present
P1612
P1612
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1. The communication line between the anti-theft
device and the Pin 71# of ECU in open circuit
2. The communication line between the anti-theft
device and the Pin 71# of ECU in bad contact
3. The Pin 71# of ECU in bad contact
Maintenance tips:
The malfunction is not ultimately confirmed and it
may possibly be a random malfunction. Inspect the
following items:
1. The communication line between the anti-theft
device and the Pin 71# of ECU
2. The contact of the Pin 71# of ECU.
114. P1613 Communication Between Anti-theft Device and ECU Disconnected
Description about Malfunction Cause:
In the case when engine is not started if the key is placed at “ON”, the anti-theft device will send message to
ECU for two times, and this malfunction will appear when ECU has received the signal from the anti-theft
device for the first time, but failed to receive for the second time.
Schematic Circuit:
Anti-theft
Device
To Next Page
