Isuzu engine C22NE / 22LE / 20LE. Manual — part 103
DRIVEABILITY AND EMISSIONS 6E1-241
KEY
TRANSPONDER
ENCRYPT
ENCRYPT
TECH-2
CARTRIDGE
ENCRYPT
BATTERY
IGN''ON''
IGN''ON''
IGN''ON''
GND
BATTERY
INJECTION:STOP
IGNITION:STOP
GND
CPU
ECM
ANTENNA COIL
RELAY
(STARTER CUT)
VEHICLE
SPEED SENSOR
IMMOBILIZER
CONTROL UNIT
VSS IN
OTHER SYSTEM
DIAGNOSIS
VEHICLE SPEED SENSOR LINE
VSS OUT
CHECK
ENGINE
LAMP
(MIL)
ENGINE
MANAGEMENT
SYSTEM
DIAGNOSIS
DLC
DIAGNOSTIC TROUBLE CODE (DTC) (Flash DTC=83)
RECEIVED RESPONSE WAS NOT CORRECT
Circuit Description
The ECM decides whether that is an abnomality
in the immobilizer control system. DTC 83 is recorded
by the ECM when received response was not correct.
Condition for Setting the DTC
• Received response was not correct.
Action Taken When the DTC Sets
• Flashing the MIL.
• The engine does not start.
Condition for Clearing the MIL/DTC
• Use clear DTC information with Tech2. (Refer to
the immobilizer workshop manual.) (ISUZU TF
Immobilizer system)
Diagnostic Aids
Check for the following conditions:
• Poor connection at ECM and Immobilizer-Inspect
harness connectors for backed out terminals,
improper mating, broken locks, improperly formed
or damaged terminals, and poor terminal to wire
connection.
• Damaged harness-Inspect the wiring harness for
damage, If the harness appears to be OK,
disconnect the ECM and Immobilizer, turn the
ignition "ON" and observe a voltmeter connected to
the suspect driver circuit at the ECM and
Immobilizer harnass connector while moving
connectors and wiring harnesses relates to the
MIL. A change in voltage will indicate the location
of the fault.
6E1-242 DRIVEABILITY AND EMISSIONS
DTC (Flash DTC=83)
Received Response Was Not Correct
Step
Action
Value(s)
Yes
No
1
Was the "On-Board Diagnostic (OBD) system Check"
performed?
-
Go to Step 2
Go to OBD
system
check
2
Replace the ECM.
IMPORTANT: The replacement ECM must be
programmed. Refer to On-Vehicle Service in Engine
Control Module and Sensors for procedures and
Immobilizer system workshop manual.
And also refer to latest Service Bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement ECM.
Is the action complete?
-
Verify repair
-
DRIVEABILITY AND EMISSIONS 6E1-243
KEY
TRANSPONDER
ENCRYPT
ENCRYPT
TECH-2
CARTRIDGE
ENCRYPT
BATTERY
IGN''ON''
IGN''ON''
IGN''ON''
GND
BATTERY
INJECTION:STOP
IGNITION:STOP
GND
CPU
ECM
ANTENNA COIL
RELAY
(STARTER CUT)
VEHICLE
SPEED SENSOR
IMMOBILIZER
CONTROL UNIT
VSS IN
OTHER SYSTEM
DIAGNOSIS
VEHICLE SPEED SENSOR LINE
VSS OUT
CHECK
ENGINE
LAMP
(MIL)
ENGINE
MANAGEMENT
SYSTEM
DIAGNOSIS
DLC
DIAGNOSTIC TROUBLE CODE (DTC) (Flash DTC=84)
NO RESPONSE FROM IMMOBILIZER
Circuit Description
The ECM decides whether that is an abnomality in the
immobilizer control system. DTC 84 is recorded by the
ECM when no response from immobilizer.
Condition for Setting the DTC
• No response from immobizer.
Action Taken When the DTC sets
• Flashing the MIL.
• The Engine does not start.
Condition for Clearing the MIL/DTC
• Use clear DTC information with Tech2. (Refer to
the immobilizer workshop manual.) (ISUZU TF
Immobilizer system)
Diagnostic Aids
Check for the following conditions:
• Poor connection at ECM and Immobilizer-Inspect
harness connectors for backed out terminals,
improper mating, broken locks, improperly formed
or damaged terminals, and poor terminal to wire
connection.
• Damaged harness?Inspect the wiring harness for
damage, If the harness appears to be OK,
disconnect the ECM and Immobilizer, turn the
ignition "ON" and observe a voltmeter connected to
the suspect driver circuit at the ECM and
Immobilizer harnass connector while moving
connectors and wiring harnesses relates to the
MIL. A change in voltage will indicate the location
of the fault.
6E1-244 DRIVEABILITY AND EMISSIONS
DTC (Flash DTC=84)
No Response From Immobilizer
Step
Action
Value(s)
Yes
No
1
Was the "On-Board Diagnostic (OBD) system Check"
performed?
-
Go to Step 2
Go to OBD
system
check
2
Using the Tech2 system selection menu, select Body
function.
Does the Tech2 indicate DTC B****?
-
Refer to
"Immobilizer
workshop
manual"
Go to Step 3
3
Does the Tech2 indicate DTC 84?
-
Go to Step 4
Refer to
Diagnostic Aids
4
1. Check the Circuit for Immobilizer system.
2. Disconnect the VEHICLE SPEED SENSOR LINE VSS
OUT harness.
3. Check for open or short to ground in the wire between
the ECM and IMMOBILIZER CONTROL UNIT by
DMM.
If a problem found, repair as necessary.
Was a problem found?
-
Verify repair
Go to Step 5
5
Replace the ECM.
IMPORTANT: The replacement ECM must be
programmed. Refer to On-Vehicle Service in Engine
Control Module and Sensors for procedures and
Immobilizer system workshop manual.
And also refer to latest Service Bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement ECM.
Is the action complete?
-
Verify repair
-
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