MULTIPLEX COMMUNICATION SYSTEM

id090200830400

Outline

• If the controller area network (CAN) system is malfunctioning, read the DTCs of the following modules, using the M-MDS to determine the malfunctioning system.

- PCM
- TCM
- DSC HU/CM
- ABS HU/CM
- Power retractable hardtop control module
- Keyless control module
- Steering angle sensor
- Instrument cluster

Flowchart

• Use the following flowchart to verify the cause of the trouble.

STEP

INSPECTION

ACTION

1
INSPECT DTC INDICATION
• Using the M-MDS, inspect if DTCs are displayed for the following module:
- PCM
- TCM
- DSC HU/CM
- ABS HU/CM
- Power retractable hardtop control module
- Keyless control module
- Steering angle sensor
- Instrument cluster
• Are any DTCs displayed?
Yes
Go to the next step.
No
Go to Step 5.
2
INSPECT CAN SYSTEM-RELATED DTC
• Are any DTCs other than the following displayed?
- U0073
- U0100
- U0101
- U0121
- U0155
- U0207
- U0214
- U0323
- U1900
- U2023
- U2197
- U2516
Yes
Repair the malfunctioning part by following the related DTC inspection.
Go to the next step.
No
Go to the next step.
3
INSPECT CAN SYSTEM-RELATED DTC
• Are any of the following DTCs displayed?
- PCM: U0073, U0101, U0121, U0155
- TCM: U0073, U0100
- DSC HU/CM: U0073, U0100, U0101, U0155, U1900, U2023
- ABS HU/CM: U0073, U1900, U2023
- Power retractable hardtop control module: U0073, U0100, U0101, U2197
- Keyless control module: U0073, U0100, U0207, U0323, U2023
- Steering angle sensor: U1900, U2516
- Instrument cluster: U0073, U0100, U0101, U0121, U0214
Yes
Repair the malfunctioning part by following the DTC inspection.
Go to the next step.
No
Troubleshooting completed.
4
VERIFY TROUBLESHOOTING COMPLETED
• Clear the DTC from the CAN system-related modules using the M-MDS.
• Start the engine.
• Are any of the CAN related DTCs displayed?
Yes
Go back to Step 3.
No
Troubleshooting completed.
5
INSPECT COMMUNICATION CONDITION
• Is there a response from the following modules?
- PCM
- TCM
- DSC HU/CM
- ABS HU/CM
- Power retractable hardtop control module
- Keyless control module
- Steering angle sensor
- Instrument cluster
Yes
Troubleshooting completed.
No
Go to the next step.
6
INSPECT MODULES THAT DO NOT RESPOND
• Inspect the power supply and the ground circuit for any units that do not respond.
• Are they normal?
Yes
Go to the next step.
No
Repair the malfunctioning part, then go back to Step 1.
7
INSPECT CONNECTOR AND WIRING HARNESS BETWEEN MODULES THAT DO NOT RESPOND AND DLC-2
• Turn the ignition switch to the LOCK position.
• Inspect the wiring harness and connector between any module that does not respond and the DLC-2.
PCM-DLC-2
- 1AM-F
- 1AI-E
TCM-DLC-2
- 1G-F
- 1C-E
DSC HU/CM-DLC-2
- X-F
- W-E
ABS HU/CM-DLC-2
- Z-F
- Y-E
Power retractable hardtop control module-DLC-2
- 3S-F
- 3U-E
Keyless control module-DLC-2
- 4AA-F
- 4Z-E
Steering angle sensor-DLC-2
- E-F
- F-E
Instrument cluster-DLC-2
- 1J-F
- 1L-E
• Is there any malfunction?
Yes
Repair the malfunctioning part, then go back to Step 1.
No
Go to the next step.
8
INSPECT WIRING HARNESS
• Turn the ignition switch to the ON position (Engine off).
• Measure the voltage between the following terminals.
- DLC-2 terminals F and GND
- DLC-2 terminals E and GND
• Is the voltage 2.0-3.0 V?
Yes
Go to the next step.
No
Go to Step 12.
9
INSPECT WIRING HARNESS
• Turn the ignition switch to the LOCK position.
• Measure the resistance between the following terminals.
- DLC-2 terminals F and E
• Is the resistance 59-65 ohms?
Yes
Replace the modules that do not respond, then go back to Step 1.
No
Go to the next step.
10
INSPECT PCM
• Disconnect the PCM connector.
• Measure the resistance between following terminals.
- PCM terminals 1AM and 1AI (part-side)
• Is the resistance 118-130 ohms?
Yes
Go to the next step.
No
Replace the PCM, then go to the next step.
11
INSPECT INSTRUMENT CLUSTER
• Disconnect the instrument cluster connector.
• Measure the resistance between the following terminals.
- Instrument cluster terminals 1J and 1L (part-side)
• Is the resistance 118-130 ohms?
Yes
Go to next step.
No
Replace the instrument cluster, then go to the next step.
12
CLASSIFY WIRING HARNESS MALFUNCTION OR MODULE MALFUNCTION
• Turn the ignition switch to the LOCK position.
• Disconnect the connector of any unit that does not respond. (If there are two or more units that do not respond, disconnect only one of the units.)
• Turn the ignition switch to the ON position.
• Measure the voltage between the following terminals.
- DLC-2 terminals F and GND
- DLC-2 terminals E and GND
• Is voltage 2.0-3.0 V?
Yes
Go to the next step.
No
Retry this step with other module connector disconnected.
If all units that do not respond are disconnected, go to Step 14.
13
INSPECT WIRING HARNESS OF ANY UNIT THAT DOES NOT RESPOND
• Turn the ignition switch to the LOCK position.
• Inspect for continuity between the following connector terminals of any disconnected unit.
PCM-DLC-2
- 1AM-other terminals
- 1AI-other terminals
TCM-DLC-2
- 1G-other terminals
- 1C-other terminals
DSC HU/CM-DLC-2
- X-other terminals
- W-other terminals
ABS HU/CM-DLC-2
- Z-other terminals
- Y-other terminals
Power retractable hardtop control module-DLC-2
- 3S-other terminals
- 3U-other terminals
Keyless control module-DLC-2
- 4AA-other terminals
- 4Z-other terminals
Steering angle sensor-DLC-2
- E-other terminals
- F-other terminals
Instrument cluster-DLC-2
- 1J-other terminals
- 1L-other terminals
• Is there continuity?
Yes
Repair or replace the wiring harness, then go back to Step 1.
No
Replace the disconnected unit, then go back to Step 1.
14
INSPECT CAN RELATED WIRING HARNESS
• Inspect the related wiring harnesses (CAN_L and/or CAN_H) for the short circuit (to power supply or ground).
• Is the wiring harness normal?
Yes
Repair or replace the wiring harness, then go back to Step 1.
No
Go back to Step 1.