Suzuki Baleno Manual page 2261

DTC42 SERIAL DATA CIRCUIT MALFUNCTION (BETWEEN IMMOBILIZER CONTROL
MODULE AND FUEL INJECTION PUMP)
DESCRIPTION
If ECU code is not transmitted from Fuel Injection Pump, Immobilizer Control Module sets DTC42.
INSPECTION:
STEP
1 Was "Immobilizer Diag. Flow Table" per-
formed?
2 1) Disconnect coupler at immobilizer con-
trol module.
2) Check voltage between coupler termi-
nal below and body ground with ignition
switch ON. See Fig.1.
D E127-6 and body ground
D E127-1 and body ground
Are they 10 – 14 V?
3 1) Disconnect fuel cut valve at coupler.
See Fig.2.
2) Check voltage between C64-2 terminal
and body ground with ignition switch
ON. See Fig.3.
Is it 10 – 14 V?
4 Is there continuity between C64-3 and
body ground?
See Fig.3.
ACTION
IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED) 8G-15
YES
Go to Step 2.
Go to Step 3.
Go to Step 4.
D Poor E127-1/6 terminals
connection,
D Poor fuel cut valve terminal
connection,
D Faulty double relay or
D Faulty fuel injection pump
1. Immobilizer control module
2. Fuel injection pump
3. Double relay
4. Coupler for fuel cut valve
NO
Go to "Immobilizer Diag.
Flow Table".
D "PNK/BLU" wire open or
D Poor C64-4 terminal
connection
D "YEL" wire open,
D "PNK" wire open,
D "BLK/ORN" wire open
or
D Poor double relay cou-
pler terminal connection
"BLK/ORN" wire open