Suzuki GRAND VITARA JB416, Service Manual

Page: 51 / 474

Engine General Information and Diagnosis: 1A-33
3 ECM, TCM (for A/T model), BCM, ABS / ESP
®
control
module, 4WD control module (if equipped), combination
meter, keyless start control module (if equipped) and
steering angle sensor (for vehicle with ESP
®
)
connectors check
1) Check for proper connection at each ECM, TCM (for A/T
model), BCM, ABS / ESP
®
control module, 4WD control
module (if equipped), combination meter, keyless start
control module (if equipped) and steering angle sensor
(for vehicle with ESP
®
) connector terminals with ignition
switch turned OFF.
2) If connections are OK, recheck ECM for DTC with
engine running.
Is there DTC P1674?
Go to Step 4. Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection: in Section
00 in related manual”.
4 ECM power and ground circuit check
1) Check ECM power and ground circuit referring to “ECM
Power and Ground Circuit Check: in related manual”.
Are they in good condition?
Go to Step 5. Repair ECM power and/
or ground circuits.
5 DTC check in BCM, TCM (for A/T model), ABS / ESP
®
control module, 4WD control module (if equipped) and
keyless start control module (if equipped) (bus off)
1) Check DTC(s) in TCM (for A/T model), ABS / ESP
®
control module, 4WD control module (if equipped) and
BCM.
Is there DTC(s) P1774 in TCM (for A/T model), U1073 in
BCM, ABS / ESP
®
control module and 4WD control module
(if equipped) and/or DTC No.33 in keyless start control
module (if equipped)?
Go to Step 6. Go to Step 7.
6 DTC check in ECM (bus off)
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check TCM (for A/T model), BCM, ABS / ESP
®
control
module and 4WD control module (if equipped) for
DTC(s).
Is there DTC(s) P1774 in TCM (for A/T model), U1073 in
BCM, ABS / ESP
®
control module, 4WD control module (if
equipped) and/or DTC No.33 in keyless start control module
(if equipped)?
Go to Step 7. CAN communication
circuit wire between
ECM and ABS / ESP
®
control module is open
or high resistance. If
wires are OK, substitute
a known-good ECM and
recheck.
7 DTC check in ECM
1) Connect connectors to ECM and disconnect connector
from BCM with ignition switch turned OFF.
2) Check ECM for DTC(s).
Is there DTC P1674?
Go to Step 8. CAN communication
circuit wire between
BCM and CAN circuit
junction connector is
open or high resistance.
If wires are OK,
substitute a known-
good BCM and recheck.
8 DTC check in ECM
1) Disconnect connectors from TCM (for A/T model) with
ignition switch turned OFF.
2) Check ECM for DTC.
Is there DTC P1674?
Go to Step 9. CAN communication
circuit wire between
TCM and CAN circuit
junction connector is
open or high resistance.
If wires are OK,
substitute a known-
good TCM (for A/T
model) and recheck.
Step Action Yes No