Dtc B3040 W-Line Communication Fail - Suzuki WagonR+ RB310 Service Manual

8G3-10 IMMOBILIZER CONTROL SYSTEM (Z13DT ENGINE MODEL)

DTC B3040 W-Line Communication Fail

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
G88-88 terminal.
Is it in good condition?
2 1) Ignition switch at OFF position.
2) Disconnect connector from Immobilizer
Control 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 G88-4, G88-5, or G88-6 and
ground.
Are they 10 – 14 V?
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 according to "Proce-
dure for 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.