Troubleshooting for Lost Communication
Troubleshooting for Lost Communication
Wiring Diagram
Refer to CAN Communication System Circuit Diagram CAN Communication System Circuit Diagram.
Diagnosis Procedure
NOTE:
Before executing items in this flow, be sure to perform Initial Inspection and Diagnostic Overview CAN Communication System Check.
When "Lost Communication" is detected in any control modules, perform inspection using the following procedure.
1) Turn ignition switch to OFF position.
2) Connect SUZUKI scan tool to DLC (1) and ignition switch to ON.
Special Tool
(A): SUZUKI scan tool (SUZUKI-SDT)
3) Using "Communication Bus Check" under "Bus Check" of SUZUKI scan tool (SUZUKI-SDT), check for control module disabled to communicate (no display on screen).
4) Based on above check results, select applicable diagnosis flow code (A to L) from Diagnosis Flow Selection Table
and perform troubleshooting according to selected diagnosis flow.
NOTE:
If it is not possible to select suitable diagnosis flow code from "Diagnosis Flow Selection Table" or "two or more diagnosis flow codes are selectable", perform Troubleshooting for Communication Bus Off Troubleshooting for Communication Bus Off.
Diagnosis Flow Selection Table
NOTE:
Diagnosis flow codes A to K link with CAN communication lines [a] to [k] of CAN Communication System Circuit Diagram CAN Communication System Circuit Diagram.
Troubleshooting
Diagnosis flow code: A
1. CAN communication circuit check
Turn ignition switch to OFF position.
Disconnect connector from ECM and ABS / ESP(R) control module.
Check for proper terminal connection to CAN communication circuit at ECM and ABS / ESP(R) control module connectors.
If OK, check CAN communication circuits between ECM connector and ABS / ESP(R) control module connector for breaking.
Is each CAN communication circuit in good condition?
YES -
Go to Step 2.
NO -
Repair CAN communication circuit.
2. Power and ground circuit check of ECM
Check ECM power and ground circuits.
Is it in good condition?
YES -
Go to Step 3.
NO -
Repair power and/or ground circuit.
3. ECM CAN terminating resistance check
Connect connector to ECM.
Check CAN terminating resistance in ECM as follows.
- ESP(R) model:
Measure Resistance between "E53-43" and "E53-44" terminal of ESP(R) control module connector.
- Non-ESP(R) model:
Measure Resistance between "E03-10" and "E03-8" terminal of ABS control module connector.
Is resistance 114 - 134 ohms?
YES -
Substitute a known-good ABS / ESP(R) control module and recheck.
NO -
Substitute a known-good ECM and recheck.
Diagnosis flow code: B
1. CAN communication circuit check
Turn ignition switch to OFF position.
Disconnect connector from BCM and ABS / ESP(R) control module.
Check for proper terminal connection to CAN communication circuit at BCM and ABS / ESP(R) control module connectors.
If OK, check CAN communication circuits between BCM connector and ABS / ESP(R) control module connector for breaking.
Is each CAN communication circuit in good condition?
YES -
Substitute a known-good ABS / ESP(R) control module and recheck.
NO -
Repair CAN communication circuit.
Diagnosis flow code: C
1. CAN communication circuit check
Turn ignition switch to OFF position.
Disconnect connector from BCM and combination meter.
Check for proper terminal connection to CAN communication circuit at BCM and combination meter connectors.
If OK, check CAN communication circuits between BCM connector and combination meter connector for breaking.
Is each CAN communication circuit in good condition?
YES -
Go to Step 2.
NO -
Repair CAN communication circuit.
2. Power and ground circuit check of combination meter
Check combination meter power and ground circuits.
Is it in good condition?
YES -
Substitute a known-good combination meter and recheck.
NO -
Repair power and/or ground circuit.
Diagnosis flow code: D
1. Power and ground circuit check of steering angle sensor
Check steering angle sensor power and ground circuits.
Is it in good condition?
YES -
Go to Step 2.
NO -
Repair power and/or ground circuit.
2. CAN communication circuit check
Turn ignition switch to OFF position.
Disconnect connector from steering angle sensor and ESP(R) control module.
Check for proper terminal connection to CAN communication circuit at steering angle sensor and ESP(R) control module connectors.
If OK, check CAN communication circuits between steering angle sensor connector and ESP(R) control module connector for breaking.
Is each CAN communication circuit in good condition?
YES -
Replace steering angle sensor.
NO -
Repair CAN communication circuit.
Diagnosis flow code: E
1. Power and ground circuit check of keyless start control module
Check keyless start control module power and ground circuits.
Is it in good condition?
YES -
Go to Step 2.
NO -
Repair power and/or ground circuit.
2. CAN communication circuit check
Turn ignition switch to OFF position.
Disconnect connector from keyless start control module and BCM.
Check for proper terminal connection to CAN communication circuit at keyless start control module and BCM connectors.
If OK, check CAN communication circuits between keyless start control module connector and BCM connector for breaking.
Is each CAN communication circuit in good condition?
YES -
Substitute a known-good keyless start control module and recheck.
NO -
Repair CAN communication circuit.
Diagnosis flow code: F
1. Power and ground circuit check of 4WD control module
Check 4WD control module power and ground circuits.
Is it in good condition?
YES -
Go to Step 2.
NO -
Repair power and/or ground circuit.
2. CAN communication circuit check
Turn ignition switch to OFF position.
Disconnect connector from 4WD control module and ABS / ESP(R) control module.
Check for proper terminal connection to CAN communication circuit at 4WD control module and ABS / ESP(R) control module connectors.
If OK, check CAN communication circuits between 4WD control module connector and ABS / ESP(R) control module connector for breaking.
Is each CAN communication circuit in good condition?
YES -
Substitute a known-good 4WD control module and recheck.
NO -
Repair CAN communication circuit.
Diagnosis flow code: G
1. Power and ground circuit check of BCM
Check BCM power and ground circuits.
Is it in good condition?
YES -
Go to Step 2.
NO -
Repair power and/or ground circuit.
2. CAN communication circuit check
Turn ignition switch to OFF position.
Disconnect connector from BCM and ABS / ESP(R) control module.
Check for proper terminal connection to CAN communication circuit at BCM and ABS / ESP(R) control module connectors.
If OK, check CAN communication circuits between BCM connector and ABS / ESP(R) control module connector for breaking.
Is each CAN communication circuit in good condition?
YES -
Substitute a known-good BCM and recheck.
NO -
Repair CAN communication circuit.
Diagnosis flow code: H
1. Power and ground circuit check of TCM
Check TCM power and ground circuits.
Is it in good condition?
YES -
Go to Step 2.
NO -
Repair power and/or ground circuit.
2. CAN communication circuit check
Turn ignition switch to OFF position.
Disconnect connector from TCM and BCM.
Check for proper terminal connection to CAN communication circuit at TCM and BCM.
If OK, check CAN communication circuits between TCM connector and BCM connector for breaking.
Is each CAN communication circuit in good condition?
YES -
Substitute a known-good TCM and recheck.
NO -
Repair CAN communication circuit.
Diagnosis flow code: I
1. Power and ground circuit check of HVAC control module
Check HVAC control module power and ground circuits.
Is it in good condition?
YES -
Go to Step 2.
NO -
Repair power and/or ground circuit.
2. CAN communication circuit check
Turn ignition switch to OFF position.
Disconnect connector from HVAC control module and BCM.
Check for proper terminal connection to CAN communication circuit at HVAC control module and BCM connectors.
If OK, check CAN communication circuits between HVAC control module connector and BCM connector for breaking.
Is each CAN communication circuit in good condition?
YES -
Substitute a known-good HVAC control module and recheck.
NO -
Repair CAN communication circuit.
Diagnosis flow code: J
1. Power and ground circuit check of SDM
Check SDM power and ground circuits.
Is it in good condition?
YES -
Go to Step 2.
NO -
Repair power and/or ground circuit.
2. CAN communication circuit check
Turn ignition switch to OFF position.
Disconnect connector from SDM and BCM.
Check for proper terminal connection to CAN communication circuit at SDM and BCM connectors.
If OK, check CAN communication circuits between SDM connector and BCM connector for breaking.
Is each CAN communication circuit in good condition?
YES -
Substitute a known-good SDM and recheck.
NO -
Repair CAN communication circuit.
Diagnosis flow code: K
1. CAN communication circuit check
Turn ignition switch to OFF position.
Disconnect "G31" connector from BCM.
Check for proper terminal connection to CAN communication circuit at BCM connector.
If OK, check CAN communication circuits between DLC and BCM connector for breaking.
Is each CAN communication circuit in good condition?
YES -
Go to Step 2.
NO -
Repair CAN communication circuit.
2. Combination meter CAN terminating resistance check
Connect "G31" connector to BCM.
Disconnect connector from ABS / ESP(R) control module.
Measure resistance between CAN High terminal and CAN Low terminal on DLC.
Is resistance 114 - 134 ohms?
YES -
Go to Troubleshooting for Communication Bus Off Troubleshooting for Communication Bus Off.
NO -
Substitute a known-good BCM and recheck.
Diagnosis flow code: L
1. Power and ground circuit check of control module that fails to communicate
Check power and ground circuits of control module that fails to communicate (BCM or ABS / ESP(R) control module).
Is it in good condition?
YES -
Substitute a known-good control module (BCM or ABS / ESP(R) control module) and recheck.
NO -
Repair power and/or ground circuit.