Check Can Communication Error For Ecm; Dtc Check In Tcm (For A/T Model); Ecm Power And Ground Circuit Check - Suzuki GRAND VITARA JB416 Service Manual

1A-36 Engine General Information and Diagnosis:
Step
2 DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Check ECM, TCM (for A/T model), ABS / ESP® control
module, 4WD control module (if equipped), keyless start
control module (if equipped) and BCM for DTC.
Is there any DTC(s) other than CAN communication DTC(s)
at each control module (other than DTC P1618, P1674,
P1676, P1678, P1685 in ECM, DTC P1774, P1777, P1778
in TCM (for A/T model), DTC U1073, U1100, U1101, U1121,
U1126, U1139, U1140, U1144 in BCM, ABS / ESP
module and 4WD control module (if equipped), and DTC
No.31 / 33 in keyless start control module (if equipped))?
3

Check CAN communication error for ECM

1) Check ECM for DTC.
Is there DTC P1674?
4 ECM, ABS / ESP® control module and TCM (for A/T
model) connector check
1) Check for proper connection at each ECM, ABS / ESP®
control module and TCM (for A/T model) connector
terminals with ignition switch turned OFF.
2) If connections are OK, recheck ECM for DTC with
engine running.
Is there DTC P1676?
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?
6

DTC check in TCM (for A/T model)

1) Check DTC P1774 in TCM (for A/T model).
Is it indicated?
7 CAN communication circuit check
1) Disconnect connectors from TCM and ECM with ignition
switch turned OFF.
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 "RED" terminal of TCM connector.
• Circuit resistance of CAN communication circuit is
less than 1 Ω between "WHT/BLU" terminal of ECM
connector and "WHT" terminal of TCM connector.
Is it in good condition?
8 ABS or ESP® control module check
1) Measure resistance at following connector terminals.
• Between "WHT/BLU" terminal and "WHT" terminal of
ABS or ESP® control module connector.
• Between "WHT/RED" terminal and "RED" terminal of
ABS or ESP® control module connector.
Is measured resistance below 1
Action
®
Ω
?
Yes
Go to applicable DTC
diag. flow.
control
Go to "DTC P1674:
CAN Communication
(Bus Off Error): ".
Go to Step 5.
Go to Step 6.
Go to "DTC P1774:
CAN Communication
Bus Off: in Section 5A".
Go to Step 9.
CAN communication
circuit wire between
TCM and ECM
connector is open or
high resistance.
No
Go to Step 3.
Go to Step 4.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection: in Section
00 in related manual".
Repair ECM power and/
or ground circuits.
Go to Step 7.
Go to Step 8.
Substitute a known-
good ABS or ESP®
control module and
recheck.