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Initial Inspection and Diagnostic Overview




Troubleshooting for CAN-DTC

Perform this troubleshooting when CAN-DTC is detected.

NOTE:

- The connectors of the ECM are watertight. If tester probes are directly connected to any of the connectors when checking the ECM and its circuits, the watertight performance of the connector will be affected, possibly resulting in corrosion of connector terminals and damage to electrical circuits.
Always use the special tool when checking the ECM and its circuits. Connect tester probes only to the special tool's connectors.
- If you connect a voltmeter or ohmmeter directly to control module terminals by removing control module connectors, you can damage the control module.
Never connect a voltmeter or an ohmmeter directly to any terminal of control module by disconnecting control module connectors.

NOTE:

- When performing this troubleshooting, be sure to have full understanding of Vehicle Damage Warnings Precaution of Troubleshooting for CAN
and observe it.
- It may be possible that CAN system has trouble because of fuse blown or low battery voltage.
Before troubleshooting, check to make sure that fuse, battery voltage and generator status are normal.
- When performing "Communication Bus Check" using SUZUKI scan tool (SUZUKI-SDT) in each step of this troubleshooting, use the following table to determine whether the control module is in good condition or not.
Also, while performing "Communication Bus Check", do not perform any work other than instructed in this troubleshooting. Or, it may occur that display of control module / sensor on SUZUKI-SDT screen and/or its background color may change.






- When disconnecting each control module connector in this troubleshooting, various DTCs will be detected. Be sure to clear DTCs in the following control modules after completing this troubleshooting.

- ECM
- BCM
- TCM (CVT model)
- Keyless start control module (keyless start model)
- 4WD control module (4WD model)
- ESP(R) control module (ESP(R) model)
- HVAC control module (Auto A/C model)
- P/S control module (EPS model)
- SDM (Advanced air bag model)

Wiring Diagram

Refer to Symptom Related Diagnostic Procedures Troubleshooting for Communication Error with Scan Tool Using CAN.

Trouble area

Refer to Symptom Related Diagnostic Procedures Troubleshooting for Communication Error with Scan Tool Using CAN.

Troubleshooting



1. DTC Check

Check DTC in the following control modules.
- ECM
- TCM
- ESP(R) control module
- BCM
- HVAC control module
- Keyless start control module
- 4WD control module
- SDM

Is there any DTC other than CAN-DTC?
YES
Go to applicable troubleshooting of DTC other than CAN-DTC.
NO
Go to Step 2.

2. Control module connector check

Disconnect negative cable at battery.
Be sure to disconnect scan tool from DLC.
Disconnect connectors of all control modules / sensors (communicated by CAN) and CAN junction connector. Symptom Related Diagnostic Procedures
Check for proper connection to terminal of each CAN line of each CAN line of disconnected in Step 3) connectors.
Check CAN junction connector for open, short to other CAN line and high resistance.
If OK, connect all connectors of control modules / sensors communicated by CAN and CAN junction connector securely.
Recheck all control modules communicated by CAN for DTC.

Is there any CAN-DTC?
YES
Go to Step 3.
NO
Intermittent trouble. Check for intermittent.

3. CAN line check

Disconnect negative cable at battery.
Disconnect connectors of all control modules / sensors (communicated by CAN). Symptom Related Diagnostic Procedures
Check all CAN lines between control modules / sensors (communicated by CAN) and DLC for open, short to power circuit, short to ground circuit, short to other CAN line and high resistance. Symptom Related Diagnostic Procedures

Are all CAN lines in good condition?
YES
Go to Step 4.
NO
Repair CAN line.

4. Power and ground circuits check of BCM, ECM, ABS / ESP(R) control module and combination meter

Check power and ground circuits the following control module.
- ECM: Component Tests and General Diagnostics
- BCM: BCM Power Circuit and Ground Circuit Check
- Combination meter: [1][2]Electrical Diagrams
- ABS / ESP(R) control module:
- ABS model: ABS Hydraulic Unit / Control Module Assembly Power Supply and Ground Circuit Check
- ESP(R) model: ESP Hydraulic Unit / Control Module Assembly Power Supply and Ground Circuit Check

Are they in good condition?
YES
Go to Step 5.
NO
Repair power and/or ground circuit.

5. CAN communication check of BCM, ECM, ABS / ESP(R) control module and combination meter

Turn ignition switch to OFF position.
Connect BCM, ECM, ABS / ESP(R) control module and combination meter connectors.
Perform "Communication Bus Check" under "Bus Check" using SUZUKI-SDT with ignition switch turned ON.

Are all of BCM, ECM, ABS / ESP(R) control module and combination meter normally displayed?
YES
Go to Step 12.
NO
Go to Step 6.

6. Terminating resistance check in ECM and combination meter

Turn ignition switch to OFF position and then disconnect negative (-) cable at battery.
Measure resistance between CAN High terminal (2) and CAN Low terminal (3) on DLC (1).






If resistance 57 - 67 ohms?
YES
Go to Step 7.
NO
Go to Step 8.

7. Substitute ECM and recheck

Substitute a known-good ECM and recheck.

Is it in good condition?
YES
End.
NO
Substitute a known-good combination meter and recheck. If NG, go to Step 11.

8. Terminating resistance check in ECM

Disconnect combination meter connector.
Measure resistance between CAN High terminal and CAN Low terminal on DLC as the same manner as Step 6.

Is resistance 114 - 134 ohms?
YES
Substitute a known-good combination meter.
NO
Go to Step 9.

9. Internal circuit check in BCM

Make sure that ignition switch is OFF position and battery negative (-) cable is disconnected.
Disconnect ABS / ESP(R) control module connector.
Measure resistance between the following.
- Between CAN High terminal on DLC and "E08-2" terminal on ABS / ESP(R) control module connector.
- Between CAN Low terminal on DLC and "E08-15" terminal on ABS / ESP(R) control module connector.

Is each resistance 0 - 1 ohms?
YES
Go to Step 10.
NO
Substitute a known-good BCM.

10. Internal circuit check in ABS / ESP(R) control module

Make sure that ignition switch is OFF position and battery negative (-) cable is disconnected.
Connect ABS / ESP(R) control module connector and disconnect ECM connector.
Measure resistance between the following.
- Between CAN High terminal on DLC and "E01-4" terminal on ECM connector.
- Between CAN Low terminal on DLC and "E01-19" terminal on ECM connector.

If each resistance 0 - 1 ohms?
YES
Substitute a known-good ECM and recheck. If NG, go to step 11.
NO
Substitute a known-good ABS / ESP(R) control module.

11. Substitute BCM and recheck

Substitute a known-good BCM and recheck.

Is it in good condition?
YES
End.
NO
Substitute a known-good ABS / ESP(R) control module.

12. CAN communication check of TCM (CVT model)

Turn ignition switch to OFF position.
Connect TCM connectors.
Perform "Communication Bus Check" under "Bus Check" using SUZUKI-SDT with ignition switch turned ON.

Are all of BCM, ECM, ABS / ESP(R) control module, combination meter and TCM normally displayed?
YES
Go to Step 13.
NO
Check power and ground circuits of TCM.
If OK, substitute a known-good TCM.

13. CAN communication check of keyless start control module (keyless start model)

Turn ignition switch to OFF position.
Connect keyless start control module connector.
Perform "Communication Bus Check" under "Bus Check" using SUZUKI-SDT with ignition switch turned ON.

Are all of BCM, ECM, ABS / ESP(R) control module, combination meter, TCM and keyless start control module normally displayed?
YES
Go to Step 14.
NO
Check power and ground circuits of keyless start control module.
If OK, substitute a known-good keyless start control module.

14. CAN communication check of Yaw rate / G sensor assembly (ESP(R) model)

Turn ignition switch to OFF position.
Connect Yaw rate / G sensor assembly connector.
Perform "Communication Bus Check" under "Bus Check" using SUZUKI-SDT with ignition switch turned ON.

Are all of BCM, ECM, ABS / ESP(R) control module, combination meter, TCM, keyless start control module and Yaw rate / G sensor assembly normally displayed?
YES
Go to Step 15.
NO
Check power and ground circuit of Yaw rate / G sensor assembly referring to "Step 3" to "Step 5" under DTC C1034 / C1039: Yaw Rate / G Sensor Assembly Power Supply Failure / Internal Failure. If OK, substitute a known-good Yaw rate / G sensor assembly.

15. CAN communication check of steering angle sensor (ESP(R) model)

Turn ignition switch to OFF position.
Connect steering angle sensor.
Perform "Communication Bus Check" under "Bus Check" using SUZUKI-SDT with ignition switch turned ON.

Are all of BCM, ECM, ABS / ESP(R) control module, combination meter, TCM, keyless start control module, Yaw rate / G sensor assembly, combination meter, ID controller, 4WD control module and steering angle sensor normally displayed?
YES
Go to Step 18.
NO
Check power and ground circuit of steering angle sensor referring to "Step 4" and "Step 5" under DTC C1037: Steering Angle Sensor Power Supply Failure. If OK, substitute a known-good steering angle sensor assembly.

16. CAN communication check of ID controller (Canada model)

Turn ignition switch to OFF position.
Connect ID controller.
Perform "Communication Bus Check" under "Bus Check" on SUZUKI-SDT with ignition switch turned ON.

Are all of BCM, ECM, ABS / ESP(R) control module, TCM, keyless start control module, Yaw rate / G sensor assembly, combination meter and ID controller normally displayed?
YES
Go to Step 16.
NO
Check power and ground circuits of ID controller. If OK, substitute a known-good ID controller.

17. CAN communication check of 4WD control module (4WD model)

Turn ignition switch to OFF position.
Connect 4WD control module.
Perform "Communication Bus Check" under "Bus Check" on SUZUKI-SDT with ignition switch turned ON.

Are all of BCM, ECM, ABS / ESP(R) control module, combination meter, TCM, keyless start control module, Yaw rate / G sensor assembly, combination meter, ID controller and 4WD control module normally displayed?
YES
Go to Step 17.
NO
Check power and ground circuits of 4WD control module referring to "Step 2" and "Step 3" under DTC C1240: 4WD Control Module Power Supply Circuit Malfunction. If OK, substitute a known-good 4WD control module.

18. CAN communication check of SDM (Advanced air bag model)

Turn ignition switch to OFF.
Connect SDM connector.
Perform "Communication Bus Check" under "Bus Check" on SUZUKI-SDT with ignition switch turned ON.

Are all of BCM, ECM, ABS / ESP(R) control module, combination meter, TCM, keyless start control module, Yaw rate / G sensor assembly, combination meter, ID controller, 4WD control module, steering angle sensor and SDM normally displayed?
YES
Recheck DTC.
NO
Check power and ground circuit of SDM.
If OK, substitute a known-good SDM.

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