Suzuki Grand Vitara 2011 Manual page 260

1A-191 Engine General Information and Diagnosis: For Petrol Engine Model
Step
5 ECM power and ground circuit check
1) Check ECM power and ground circuits referring to "ECM
Power and Ground Circuit Check: For Petrol Engine
Model".
Are they in good condition?
6 DTC check in ABS / ESP® control module
1) Check DTC U1073 in ABS / ESP® control module.
Is it indicated?
7 CAN communication circuit check
1) Disconnect connectors from ABS or ESP® control
module and ECM.
2) Check that CAN communication circuit is as follows.
• Circuit resistance of CAN communication circuit is
less than 1 Ω between "WHT/RED" terminal of ECM
connector and "WHT/RED" terminal of ABS or ESP®
connector.
• Circuit resistance of CAN communication circuit is
less than 1 Ω between "WHT/BLU" terminal of ECM
connector and "WHT/BLU" terminal of ABS / ESP®
control module connector.
Is it in good condition?
8 CAN communication circuit check
1) Connect connector to ABS or ESP® control module with
ignition switch turned OFF.
2) Measure resistance at following connector terminals.
• Between "WHT/BLU" and "WHT" terminals of ABS or
ESP® control module connector.
• Between "WHT/RED" and "RED" terminals of ABS or
ESP® control module connector.
Is resistance below 1
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?
Action
Ω
?
Yes
Go to Step 6.
• For vehicle without
ESP®, go to "DTC
U1073: Control
Module
Communication Bus
Off (Petrol Engine
Model) in Section
4E".
• For vehicle with
ESP®, go to "DTC
U1073: Control
Module
Communication Bus
Off in Section 4F".
Go to Step 9.
CAN communication
circuit wire between
ABS or ESP® control
module and ECM
connector is open or
high resistance.
Go to Step 8.
No
Repair ECM power and/
or ground circuits.
Go to Step 7.
Go to Step 8.
Substitute a known-
good ABS or ESP®
control module
assembly and recheck.
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.