Suzuki GRAND VITARA JB416, Service Manual

Page: 449 / 474

Immobilizer Control System: 10C-11
DTC P1621: Immobilizer Communication Line Error
S5JB0EA304012
Wiring Diagram
Refer to “Immobilizer Control System Wiring Circuit Diagram: ”
Detecting Condition and Trouble Area
7 Check for short to power supply wire circuit in CAN
communication wire circuits
1) Measure resistance at the following wire terminals with
the ignition switch at ON position.
Vehicle equipped without ESP
®
system
• Between “E03-6” wire terminal at ABS control
module connector and body ground
• Between “E03-12” wire terminal at ABS control
module connector and body ground
Vehicle equipped with ESP
®
system
• Between “E53-13” wire terminal at ESP
®
control
module connector and body ground
• Between “E53-44” wire terminal at ESP
®
control
module connector and body ground
Is voltage 0 V?
Go to Step 8. Repair short to power
supply wire circuit in
CAN communication
wire circuits.
8 Check of keyless start control module power and
ground wire circuits
1) Check keyless start control module power and ground
wire circuits referring to “Keyless Start Control Module
Power and Ground Circuit Check: in Section 10E in
related manual”.
Are they in normal?
Replace keyless start
control module with a
known-good one and
recheck. Repair malfunctional
wire circuit.
Step Action Yes No
Detecting Condition Trouble Area
Communication error between immobilizer control module
(ICM) and ECM is detected by ECM. • Related fuse(s) blown
• Poor connection at immobilizer control module (ICM)
connector
• Poor connection at ECM connector
• Open in power supply wire circuit
• Open in ground wire circuit
• Open in communication wire circuits
• Short to ground wire circuit in communication wire
circuits
• Short to power supply wire circuit in communication
wire circuits
• Short of communication wire circuits
• Immobilizer control module (ICM) faulty
• ECM faulty