Troubleshooting for Lost Communication
Troubleshooting for Lost Communication
Circuit Diagram
Refer to CAN Communication System Circuit Diagram CAN Communication System Circuit Diagram.
Diagnosis Procedure
NOTE:
- Be sure to perform Initial Inspection and Diagnostic Overview CAN Communication Check
before perform this flow.
- Occurrence of multiple troubles is not included in the scope of this trouble diagnosis.
When "Lost Communication" is detected in any control module, perform diagnosing by the following procedure.
1) Connect SUZUKI scan tool to DLC.
2) Push engine switch to change ignition mode to "ON".
3) Select "Communication Bus Check" under "Bus Check" menu of SUZUKI scan tool and check for disabled communicating control module (it is not displayed on screen).
4) Based on above check results, select applicable diagnosis flow code ([a] to [o]) from Diagnosis Flow Selection Table.
5) Perform troubleshooting according to selected diagnosis flow.
Diagnosis Flow Selection Table
NOTE:
- If an individual control module or sensor fails to communicate, check whether power circuit or ground circuit of control module or sensor is in good condition, by referring to system circuit diagram, etc. before diagnosing trouble with flow chart.
- If it is not possible to select suitable diagnosis flow from Diagnosis Flow Selection Table
or "two or more diagnosis flows are selectable", perform Troubleshooting for Communication Bus Off Troubleshooting for Communication Bus Off.
- Diagnosis flows [a] to [o] link with CAN communication lines [a] to [o] of CAN Communication System Circuit Diagram CAN Communication System Circuit Diagram.
Troubleshooting
Diagnosis flow: [a]
1. CAN communication circuit check
Disconnect negative (-) cable at battery.
Disconnect combination meter connector.
Check for proper connection to DLC and combination meter connector.
If connections are OK, check CAN communication circuit [a] between DLC and combination meter connector for open.
Is it in good condition?
YES -
Go to Step 2.
NO -
Repair or replace defective wire harness.
2. Combination meter terminating resistance check
Connect combination meter connector.
Disconnect ECM connector "E01".
Measure resistance between "G211-6" and "G211-14" terminals of DLC.
Is resistance 114 - 134 ohms?
YES -
Go to Troubleshooting for Communication Bus Off Troubleshooting for Communication Bus Off.
NO -
Substitute a known-good combination meter and recheck DTC. Service and Repair
Diagnosis flow: [b]
1. CAN communication circuit check
Disconnect negative (-) cable at battery.
Disconnect combination meter connector and keyless start control module connector "G04".
Check for proper connection to combination meter connector.
If connections are OK, check CAN communication circuit [b] between combination meter connector and keyless start control module connector for open.
Is it in good condition?
YES -
Substitute a known-good combination meter and recheck DTC. Service and Repair
NO -
Repair or replace the following defective part.
- CAN communication circuit [b] is faulty between combination meter and J/C
- J/C "G306" is faulty
Diagnosis flow: [c]
1. CAN communication circuit check
Disconnect negative (-) cable at battery.
Disconnect 4WD control module connector and keyless start control module connector "G04".
Check for proper connection to 4WD control module connector.
If connections are OK, check CAN communication circuit [c] between 4WD control module connector and keyless start control module connector for open.
Is it in good condition?
YES -
Substitute a known-good 4WD control module and recheck DTC. Service and Repair
NO -
Repair or replace the following defective part.
- CAN communication circuit [c] is faulty between 4WD control module and J/C
- J/C "G306" is faulty
- Poor connection of "G341" and "L374" connectors
Diagnosis flow: [d]
1. CAN communication circuit check
Disconnect negative (-) cable at battery.
Disconnect BCM connector "L03" and keyless start control module connector "G04".
Check for proper connection to BCM connector.
If connections are OK, check CAN communication circuit [d] between BCM connector and keyless start control module connector for open.
Is it in good condition?
YES -
Substitute a known-good BCM and recheck DTC. Service and Repair
NO -
Repair or replace the following defective part.
- CAN communication circuit [d] is faulty between BCM and J/C
- J/C "G306" is faulty
- Poor connection of "G341" and "L374" connectors
Diagnosis flow: [e]
1. CAN communication circuit check
Disconnect negative (-) cable at battery.
Disconnect BCM connector "L03" and keyless start control module connector "G04".
Check for proper connection to keyless start control module connector.
If connections are OK, check CAN communication circuit [e] between keyless start control module connector and BCM connector for open.
Is it in good condition?
YES -
Substitute a known-good keyless start control module and recheck DTC. Service and Repair
NO -
Repair or replace the following defective part.
- CAN communication circuit [e] is faulty between keyless start control module and J/C
- J/C "G306" is faulty
Diagnosis flow: [f]
1. CAN communication circuit check
Disconnect negative (-) cable at battery.
Disconnect steering angle sensor connector and keyless start control module connector "G04".
Check for proper connection to steering angle sensor connector.
If connections are OK, check CAN communication circuit [f] between keyless start control module connector and steering angle sensor connector for open.
Is it in good condition?
YES -
Substitute a known-good steering angle sensor and recheck DTC. Steering Angle Sensor Removal and Installation
NO -
Repair or replace the following defective part.
- CAN communication circuit [f] is faulty between steering angle sensor and J/C
- J/C "G306" is faulty
Diagnosis flow: [g]
1. CAN communication circuit check
Disconnect negative (-) cable at battery.
Disconnect SDM connector "G11" and keyless start control module connector "G04".
Check for proper connection to SDM connector.
If connections are OK, check CAN communication circuit [g] between keyless start control module connector and SDM connector for open.
Is it in good condition?
YES -
Substitute a known-good SDM and recheck DTC. SDM Removal and Installation
NO -
Repair or replace the following defective part.
- CAN communication circuit [g] is faulty between SDM and J/C
- J/C "G306" is faulty
Diagnosis flow: [h]
1. CAN communication circuit check
Disconnect negative (-) cable at battery.
Disconnect HVAC control module connector and keyless start control module connector "G04".
Check for proper connection to HVAC control module connector.
If connections are OK, check CAN communication circuit [h] between keyless start control module connector and HVAC control module connector for open.
Is it in good condition?
YES -
Substitute a known-good HVAC control module and recheck DTC. HVAC Control Module Removal and Installation
NO -
Repair or replace the following defective part.
- CAN communication circuit [h] is faulty between HVAC control module and J/C
- J/C "G306" is faulty
Diagnosis flow: [i]
1. CAN communication circuit check
Disconnect negative (-) cable at battery.
Disconnect rain / light sensor connector and keyless start control module connector "G04".
Check for proper connection to rain / light sensor connector.
If connections are OK, check CAN communication circuit [i] between rain / light sensor connector and keyless start control module connector for open.
Is it in good condition?
YES -
Substitute a known-good rain / light sensor and recheck DTC. Removal and Replacement
NO -
Repair or replace the following defective part.
- CAN communication circuit [i] is faulty between rain / light sensor and J/C
- J/C "G306" is faulty
- Poor connection of "G341" and "L374" connectors
- Poor connection of "K152" and "L383" connectors
Diagnosis flow: [j]
1. CAN communication circuit check
Disconnect negative (-) cable at battery.
Disconnect 4WD control module connector and BCM connector "L03".
Check for proper connection to 4WD control module and BCM connectors.
If connections are OK, check CAN communication circuit [j] between 4WD control module connector and BCM connector for open.
Is it in good condition?
YES -
Go to Step 2.
NO -
Repair or replace defective wire harness.
2. CAN communication circuit resistance check
Connect 4WD control module connector.
Measure resistance between "L03-4" and "L03-5" terminals of BCM connector.
Is resistance 114 - 134 ohms?
YES -
Substitute a known-good BCM and recheck DTC. Service and Repair
NO -
Substitute a known-good 4WD control module and recheck DTC. Service and Repair
Diagnosis flow: [k]
1. CAN communication circuit check
Disconnect negative (-) cable at battery.
Disconnect ESP(R) control module connector and BCM connector "E05".
Check for proper connection to ESP(R) control module and BCM connectors.
If connections are OK, check CAN communication circuit [k] between ESP(R) control module connector and BCM connector for open.
Is it in good condition?
YES -
Go to Step 2.
NO -
Repair or replace defective wire harness.
2. CAN communication circuit resistance check
Connect BCM connector.
Measure resistance between "E09-2" and "E09-15" terminals of ESP(R) control module connector.
Is resistance 114 - 134 ohms?
YES -
Substitute a known-good ESP(R) control module and recheck DTC. ESP Hydraulic Unit / Control Module Assembly Removal and Installation
NO -
Substitute a known-good BCM and recheck DTC. Service and Repair
Diagnosis flow: [l]
1. CAN communication circuit check
Disconnect negative (-) cable at battery.
Disconnect ESP(R) control module connector and ECM connector "E01".
Check for proper connection to ESP(R) control module connector.
If connections are OK, check CAN communication circuit [l] between ESP(R) control module connector and ECM connector for open.
Is it in good condition?
YES -
Substitute a known-good ESP(R) control module and recheck DTC. ESP Hydraulic Unit / Control Module Assembly Removal and Installation
NO -
Repair or replace the following defective part.
- CAN communication circuit [l] is faulty between ESP(R) control module and J/C
- J/C "E346" is faulty
Diagnosis flow: [m]
1. CAN communication circuit check
Disconnect negative (-) cable at battery.
Disconnect ESP(R) control module connector and ECM connector "E01".
Check for proper connection to ECM connector.
If connections are OK, check CAN communication circuit [m] between ESP(R) control module connector and ECM connector for open.
Is it in good condition?
YES -
Replace ECM and recheck DTC. Service and Repair
NO -
Repair or replace the following defective part.
- CAN communication circuit [m] is faulty between ECM and J/C
- J/C "E346" is faulty
Diagnosis flow: [n]
1. CAN communication circuit check
Disconnect negative (-) cable at battery.
Disconnect TCM connector "E19" and ECM connector "E01".
Check for proper connection to TCM connector.
If connections are OK, check CAN communication circuit [n] between TCM connector and ECM connector for open.
Is it in good condition?
YES -
Substitute a known-good TCM and recheck DTC. Service and Repair
NO -
Repair or replace the following defective part.
- CAN communication circuit [n] is faulty between TCM and J/C
- J/C "E346" is faulty
Diagnosis flow: [o]
1. CAN communication circuit check
Disconnect negative (-) cable at battery.
Disconnect P/S control module connector "E10" and ECM connector "E01".
Check for proper connection to P/S control module connector.
If connections are OK, check CAN communication circuit [o] between P/S control module connector and ECM connector for open.
Is it in good condition?
YES -
Substitute a known-good P/S control module and recheck DTC. Service and Repair
NO -
Repair or replace the following defective part.
- CAN communication circuit [o] is faulty between P/S control module and J/C
- J/C "E346" is faulty