Suzuki GRAND VITARA JB416, Service Manual

Page: 61 / 474

Engine General Information and Diagnosis: 1A-43
4 ECM and ABS / ESP
®
control module connector check
1) Check for proper connection at each ECM and ABS /
ESP
®
control module connector terminals with ignition
switch turned OFF.
2) If connections are OK, recheck ECM for DTC with
engine running.
Is there DTC P1685?
Go to Step 5. Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection: in Section
00 in related manual”.
5 ECM power and ground circuit check
1) Check ECM power and ground circuits referring to “ECM
Power and Ground Circuit Check: in related manual”.
Are they in good condition?
Go to Step 6. Repair ECM power and/
or ground circuits.
6 DTC check in ABS / ESP
®
control module
1) Check DTC U1073 in ABS / ESP
®
control module.
Is it indicated?
• For vehicle without
ESP
®
, go to “DTC
U1073: Control
Module
Communication Bus
Off: in Section 4E”.
• For vehicle with
ESP
®
, go to “DTC
U1073: Control
Module
Communication Bus
Off: in Section 4F”.
Go to Step 7.
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?
Go to Step 9. Go to Step 8.
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
Ω
?
CAN communication
circuit wire between
ABS or ESP
®
control
module and ECM
connector is open or
high resistance.
Substitute a known-
good ABS or ESP
®
control module
assembly and recheck.
Step Action Yes No