Suzuki Wagon R Manual page 4068

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DTC B3040 W-Line Communication Failure
Wiring Circuit
Refer to "Wiring Circuit" in this section.
DTC Detecting Condition and Trouble Area
DTC Detecting Condition
No response from ECM while Immobilizer Control
Module requests signal.
Troubleshooting
Step
1
1) Ignition switch at OFF position.
2) Disconnect connector from ECM.
3) Check for proper connection to ECM at
G21-2 terminal.
Is it in good condition?
2
1) Ignition switch at OFF position.
2) Disconnect connector from immobilizer con-
trol module.
3) Check for proper connection to immobilizer
control module at G17-7 terminal.
Is it in good condition?
3
With connectors connected, measure voltage
between terminal G17-7 and ground with igni-
tion switch at ON position.
Is it 10 – 14 V?
4
With ignition switch at ON position, measure
voltage between G21-33 or G21-49 and
ground.
Are they 10 – 14 V?
IMMOBILIZER CONTROL SYSTEM (Z10XEP / Z12XEP ENGINE MODELS) 8G4-13
Action
Trouble Area
• W-line circuit
• ECM power circuit
Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
Substitute a known-good
ECM referring to "Proce-
dure after ECM Replace-
ment" in this section and
recheck.
No
Repair or replace.
Repair or replace.
W-line (WHT) circuit
open.
ECM power supply (BLK/
RED) circuit open.

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