Suzuki GRAND VITARA JB416, Service Manual

Page: 57 / 474

Engine General Information and Diagnosis: 1A-39
DTC Troubleshooting
NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions For DTC Troubleshooting: in related manual”.
Step Action Yes No
1 Was “Engine and Emission Control System Check”
performed? Go to Step 2. Go to “Engine and
Emission Control
System Check: in
related manual”.
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
®
control
module and 4WD control module (if equipped), and DTC
No.31 / 33 in keyless start control module (if equipped))?
Go to applicable DTC
diag. flow. Go to Step 3.
3 CAN communication error check for ECM
1) Check ECM for DTC.
Is there DTC P1674?
Go to “DTC P1674:
CAN Communication
(Bus Off Error): ”. Go to Step 4.
4 ECM, ABS / ESP
®
control module and BCM connector
check
1) Check for proper connection at each ECM, ABS / ESP
®
control module and BCM connector terminals with
ignition switch turned OFF.
2) If connections are OK, recheck ECM for DTC with
engine running.
Is there DTC P1678?
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 BCM
1) Check DTC U1073 in BCM.
Is it indicated?
Go to “DTC U1073 (No.
1073): Control Module
Communication Bus
Off: in Section 10B”. Go to Step 7.
7 CAN communication circuit check
1) Disconnect connectors from BCM 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 “RED” terminal of BCM connector.
• Circuit resistance of CAN communication circuit is
less than 1
Ω
between “WHT/BLU” terminal of ECM
connector and “WHT” terminal of BCM connector.
Is it in good condition?
Go to Step 9. Go to Step 8.