Isuzu engine C22NE / 22LE / 20LE. Service manual — part 104
DRIVEABILITY AND EMISSIONS 6E1-245
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=85)
SECURITY CODE & SECURITY KEY NOT PROGRAMMED
Circuit Description
The ECM decides whether that is an abnomality in the
immobilizer control system. DTC 85 is recorded by the
ECM when security code & secret key not
programmed.
Condition for Setting the DTC
• Security code & secret key not programmed.
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.
6E1-246 DRIVEABILITY AND EMISSIONS
DTC (Flash DTC=85)
Security Code & Secret Key Not Programmed
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
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?
-
Go to Step 4
-
4
Does the Tech2 indicate DTC 85?
-
Go to Step 3
Verify repair.
DRIVEABILITY AND EMISSIONS 6E1-247
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=86)
RECEIVED INCORRECT SECURITY CODE
Circuit Description
The ECM decides whether that is an abnomality in the
immobilizer control system. DTC 86 is recorded by the
ECM when received incorrect security code.
Condition for Setting the DTC
• Received incorrect security code.
Action Taken When the DTC Sets
• Flashing the MIL.
• The engine does not start.
In case replacement ECM, Action Taken
When the DTC Sets
• Flashing the MIL.
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.
6E1-248 DRIVEABILITY AND EMISSIONS
DTC (Flash DTC=86)
Received Incorrect Security Code
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
Recheck the security code.
Is the action complete?
-
Verify repair
-
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