Dtc86 - Can Communication Fault (Can Timeout Error) - Isuzu 4HL1 Workshop Manual

DTC86 - CAN Communication Fault (CAN Timeout Error)

Circuit Description
Mutual communications (CAN communications) are
established between ECM and VIM so that the data
received by the ECM is sent to the VIM and vice versa.
DTC86 will be set when the CAN signal is not input.
Major Faulty Event
• Poor driveability
• Terminated VIM control (e.g., tachometer or PTO)
Conditions for Setting the DTC
CAN signal is not input for 1 second.
Action Taken When the DTC Sets
• After the DTC is set, the ECM will illuminate the
CHECK ENGINE lamp (MIL).
• Communications between ECM and VIM are
terminated and
predetermined values will be dominant.
Conditions for Clearing MIL/DTC
When the system fails and the DTC is stored to the
ECM, even repairing the faulty portion will not clear the
DTC from the memory. To clear the DTC, conduct the
following steps.
1. Turn off the idle position switch for not less than 1
second but not more than 3 seconds. (Press the
accelerator pedal.)
the control mode
ECM
(Engine
Control
Module)
97 89
VIM
2. Turn on the idle position switch for not less than 1
second but not more than 3 seconds. (Release the
accelerator pedal.)
3. Turn off the idle position switch for not less than 1
second but not more than 3 seconds. (Press the
accelerator pedal.)
4. Turn on the idle position switch for not less than 1
second but not more than 3 seconds. (Release the
accelerator pedal.)
5. Turn off the idle position switch for not less than 1
second but not more than 3 seconds. (Press the
accelerator pedal.)
6. After the above operations are properly completed,
the CHECK ENGINE lamp (MIL) illuminates for 3
seconds to report the memory is cleared.
7. Turn off the starter switch. Wait for 5 seconds and
turn on the starter switch again.
When Tech 2 has been connected to the vehicle, the
with
DTC can be cleared through the memory clear
operation with Tech 2.
Engine Control System 1A-169
LNW21AMF007601-X