Suzuki 2006 SX4, Service Manual

Page: 1439 / 1478

Immobilizer Control System: 10C-14
Troubleshooting
DTC P1636: Immobilizer Information Registration Failure
S6RW0CA304016
Wiring Diagram
Refer to “Immobilizer Control System Wiring Circuit Diagram”.
Detecting Condition and Trouble Area
Troubleshooting
Step Action Yes No
1 Was “Immobilizer Control System Check” performed? Go to Step 2. Go to “Immobilizer
Control System Check”.
2 DTC confirmation
1) Clear DTC referring to “DTC Clearance”.
2) Turn the ignition switch to OFF position.
3) Check DTC referring to “DTC Check”.
Is DTC P1625 still detected?
Substitute a known-
good ICM and recheck
DTC. If DTC P1625 is
still detected, substitute
a known-good ECM and
recheck. Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.
Detecting Condition Trouble Area
The registration of the immobilizer control system
information in ECM is failed. • CAN communication circuit
• Keyless start control module (if equipped)
• Combination meter
• TCM (A/T model)
• 4WD control module (if equipped)
• ABS control module
• BCM
• ECM
Step Action Yes No
1 Was “Immobilizer Control System Check” performed? Go to Step 2. Go to “Immobilizer
Control System Check”.
2 DTC check of ECM
1) Check ECM for DTC referring to “DTC Check in Section
1A”.
Is DTC U0073, U0101, U0121 and/or U0140 detected?
Go to applicable DTC
diag. flow. Go to Step 3.
3 DTC check of BCM
1) Check BCM for DTC referring to “DTC Check in Section
10B”.
Is DTC U0073, U0100, U0101, U0155 and/or U1144
detected?
Go to applicable DTC
diag. flow. Go to Step 4.
4 CAN communication circuit check
1) Disconnect connectors from ECM, BCM and ABS
control module.
2) Check CAN communication circuit for open, short and
high resistance.
• Between ECM and ABS control module
• Between BCM and ABS control module
Is each CAN communication circuit in good condition?
Go to Step 5. Repair circuit.