Isuzu KB P190. Manual — part 1466
IMMOBILIZER CONTROL SYSTEM (4JK1/4JJ1/HFV6) 11A-13
Scan Tool Does Not Communicate with CAN Device
Circuit Description
The engine control module (ECM), transmission control
module (TCM) (AISIN A/T only) and ICU all
communicate with the scan tool over the controller area
network (CAN) link. The ECM, TCM, ICU and the data
recording module (DRM) communicate with each other
over the same CAN link. (4JK1/ 4JJ1)
The ECM, TCM, powertrain interface module (PIM) and
ICU all communicate with the scan tool over the CAN
link. (HFV6)
Diagnostic Aids
The following conditions will cause a loss of CAN serial
data communication between the ECM, TCM and PIM
or between the scan tool and any control module:
• A CAN serial data circuit open
• A CAN serial data circuit shorted to ground
• A CAN serial data circuit shorted to voltage
• An internal condition within a module or connector
on the CAN serial data circuit, that causes a short
to voltage or ground to the CAN serial data circuit
Schematic Reference: Immobilizer Controls
Schematics
Connector End View Reference: ICU Connector End
View
Circuit/ System Testing Scan Tool Does Not Communicate with CAN Device (4JK1/ 4JJ1)
Step
Action
Value(s)
Yes
No
1
Did you perform the Diagnostic System Check -
Immobilizer Controls?
—
Go to Step 2
Go to Diagnostic
System Check -
Immobilizer
Controls
2
Important: Make sure the CANdi module is not
malfunctioning. When functioning properly, the
CANdi module LED will be flashing. In the event of
a problem, the LED will be continually illuminated
or not illuminated.
1.
Install a scan tool.
2.
Turn ON the ignition, with the engine OFF.
3.
Attempt to establish communication with the
listed control modules.
• Immobilizer Control Unit (ICU)
• Engine control module (ECM)
• Transmission control module (TCM)
(AISIN A/T only)
Does the scan tool communicate with any of the
listed control modules?
—
Go to Step 3
Go to Step 7
3
Does the scan tool communicate with the ECM?
—
Go to Step 4
Go to Diagnostic
System Check -
Engine Controls
4
Notice: If no AISIN automatic transmission is
installed, skip to Step 5.
Does the scan tool communicate with the TCM?
—
Go to Step 5
Go to Diagnostic
System Check -
Transmission
Controls
5
Does the scan tool communicate with the ICU?
—
Go to Step 6
Go to Lost
Communication with
The Immobilizer
Control Unit (ICU)
11A-14 IMMOBILIZER CONTROL SYSTEM (4JK1/4JJ1/HFV6)
6
Test the CAN Low and High serial data circuit for an
intermittently short to ground, intermittently short to
voltage or short circuit each other. Then, test the
CAN Low and High serial data circuit for an
intermittently open (based on which control module
did not communicate) at the connection in the
circuit.
Did you find and correct the condition?
—
Go to Step 17
System OK
7
1.
Inspect for an intermittent, for poor
connections and for corrosion at the data link
connector (DLC) (pins 6 and 14 of B-58)
2.
Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 17
Go to Step 8
8
Notice: If no data recording module (DRM) is
installed, skip to Step 9.
1.
Turn OFF the ignition.
2.
Disconnect the DRM C-139 harness
connector.
3.
Turn ON the ignition, with the engine OFF.
4.
Attempt to communicate with the ECM, TCM
and ICU.
Does the scan tool communicate with the ECM,
TCM and ICU?
—
Go to Step 13
Go to Step 9
9
1.
Turn OFF the ignition.
2.
Reconnect the DRM C-139 harness connector
if disconnected.
3.
Disconnect the ECM J1 (E-90) and J2 (C-58)
harness connectors.
4.
Turn ON the ignition, with the engine OFF.
5.
Attempt to communicate with the TCM and
ICU.
Does the scan tool communicate with the TCM and
ICU?
—
Go to Step 14
Go to Step 10
10
Notice: If no AISIN automatic transmission is
installed, skip to Step 11.
1.
Turn OFF the ignition.
2.
Reconnect the ECM J1 (E-90) and J2 (C-58)
harness connectors.
3.
Disconnect the TCM C-94 and C-95 harness
connectors.
4.
Turn ON the ignition, with the engine OFF.
5.
Attempt to communicate with the ECM and
ICU.
Does the scan tool communicate with the ECM and
ICU?
—
Go to Step 15
Go to Step 11
Step
Action
Value(s)
Yes
No
IMMOBILIZER CONTROL SYSTEM (4JK1/4JJ1/HFV6) 11A-15
Circuit/ System Testing Scan Tool Does Not Communicate with CAN Device (HFV6)
11
1.
Turn OFF the ignition.
2.
Reconnect the ECM J1 (E-90) and J2 (C-58)
harness connectors if disconnected.
3.
Reconnect the TCM C-94 and C-95 harness
connectors if disconnected.
4.
Disconnect the ICU B-109 harness connector.
5.
Turn ON the ignition, with the engine OFF.
6.
Attempt to communicate with the ECM and
TCM.
Does the scan tool communicate with the ECM and
TCM?
—
Go to Step 16
Go to Step 12
12
Repair the open circuit, short to ground, short to
voltage or short circuit each other on the CAN Low
or High serial data circuit between the DLC and
ECM, TCM, ICU or DRM.
Did you complete the repair?
—
Go to Step 17
—
13
Replace the DRM. Refer to DRM Replacement.
Did you complete the replacement?
—
Go to Step 17
—
14
Important: Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement?
—
Go to Step 17
—
15
Important: Replacement TCM must be
programmed.
Replace the TCM. Refer to TCM Replacement.
Did you complete the replacement?
—
Go to Step 17
—
16
Important: Replacement ICU must be
programmed.
Replace the ICU. Refer to ICU Replacement.
Did you complete the replacement?
—
Go to Step 17
—
17
Attempt to establish communication with the ECM,
TCM and ICU.
Does the scan tool communicate with the ECM,
TCM and ICU?
—
System OK
Go to Step 2
Step
Action
Value(s)
Yes
No
1
Did you perform the Diagnostic System Check -
Immobilizer Controls?
—
Go to Step 2
Go to Diagnostic
System Check -
Immobilizer
Controls
Step
Action
Value(s)
Yes
No
11A-16 IMMOBILIZER CONTROL SYSTEM (4JK1/4JJ1/HFV6)
2
Important: Make sure the CANdi module is not
malfunctioning. When functioning properly, the
CANdi module LED will be flashing. In the event of
a problem, the LED will be continually illuminated
or not illuminated.
1.
Install a scan tool.
2.
Turn ON the ignition, with the engine OFF.
3.
Attempt to establish communication with the
listed control modules.
• Immobilizer Control Unit (ICU)
• Engine control module (ECM)
• Transmission control module (TCM)
• Powertrain Interface module (PIM)
Does the scan tool communicate with any of the
listed control modules?
—
Go to Step 3
Go to Step 8
3
Does the scan tool communicate with the PIM?
—
Go to Step 4
Go to Diagnostic
System Check -
Powertrain Interface
Module
4
Does the scan tool communicate with the ECM?
—
Go to Step 5
Go to Diagnostic
System Check -
Engine Controls
5
Notice: If no automatic transmission is installed,
skip to Step 6.
Does the scan tool communicate with the TCM?
—
Go to Step 6
Go to Diagnostic
System Check -
Transmission
Controls
6
Does the scan tool communicate with the ICU?
—
Go to Step 7
Go to Lost
Communication with
The Immobilizer
Control Unit (ICU)
7
Test the CAN Low and High serial data circuit for an
intermittently short to ground, intermittently short to
voltage or short circuit each other. Then, test the
CAN Low and High serial data circuit for an
intermittently open (based on which control module
did not communicate) at the connection in the
circuit.
Did you find and correct the condition?
—
Go to Step 20
System OK
8
1.
Inspect for an intermittent, for poor
connections and for corrosion at the data link
connector (DLC) (pins 6 and 14 of B-58).
2.
Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 20
Go to Step 9
9
1.
Turn OFF the ignition.
2.
Disconnect the ECM C-56 and E-60 harness
connectors.
3.
Turn ON the ignition, with the engine OFF.
4.
Attempt to communicate with the TCM, PIM
and ICU.
Does the scan tool communicate with the TCM,
PIM and ICU?
—
Go to Step 16
Go to Step 10
Step
Action
Value(s)
Yes
No
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