Suzuki GRAND VITARA JB416 Service Manual page 62

1A-44 Engine General Information and Diagnosis:
Step
9 DTC check in ECM
1) Connect connectors to ABS or ESP® control module
and ECM with ignition switch turned OFF.
2) Disconnect connector from BCM with ignition switch
turned OFF.
3) Check ECM for DTC(s).
Is there DTC P1685?
10 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 P1685?
11 DTC check in ECM
1) Disconnect connector from keyless start control module
(if equipped) with ignition switch turned OFF.
2) Check ECM for DTC.
Is there DTC P1685?
12 DTC check in ECM
1) Disconnect connector from combination meter with
ignition switch turned OFF.
2) Check ECM for DTC.
Is there DTC P1685?
Action Yes
Go to Step 8.
Go to Step 9.
Go to Step 10.
Go to Step 11.
No
CAN communication
circuit wire between
BCM and CAN circuit
junction connector is
open or high resistance.
If wires are OK, check
BCM power and ground
circuits. If circuits are
OK, substitute a known-
good BCM and recheck.
CAN communication
circuit wire between
TCM and CAN circuit
junction connector is
open or high resistance.
If wires are OK, check
TCM power and ground
circuits. If circuits are
OK, substitute a known-
good TCM (for A/T
model) and recheck.
CAN communication
circuit wire between
keyless start control
module and CAN circuit
junction connector is
open or high resistance.
If wires are OK, check
keyless start control
module power and
ground circuit. If circuit
are OK, substitute a
known-good keyless
start control module and
recheck.
CAN communication
circuit wire between
combination meter and
CAN circuit junction
connector is open or
high resistance. If wires
are OK, check
combination meter
power and ground
circuits. If circuits are
OK, substitute a known-
good combination meter
and recheck.