Diagnostic system check-transfer case controls (4WD models)

Note

  • The installed devices vary depending on the vehicle. All the devices that may be connected to the CAN communication circuit are shown in the diagnostic procedure. Perform diagnosis only for the applicable device procedure.
  • If there are no complaints on drivability, do not perform these diagnostic steps unless otherwise instructed in other sections.
  • Check for related Service Bulletins before starting the diagnosis.
  • Do not clear the DTC unless instructed to do so in a diagnostic step.
  • The battery should be fully charged.
  • The battery cable should be normal and securely connected.
  • The ground of the TCCM should be securely connected to the correct position.
  • The TCCM harness connectors should be clean and correctly connected.
  • The TCCM terminals should be clean and correctly connected.

1. Scan tool power-up check

1) Connect the scan tool. Does the scan tool power up?

Yes

=>Go to Scan tool communication verification.

No

Go to Scan tool does not power up.

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) Scan tool does not power up".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) Scan tool does not power up".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) Scan tool does not power up".

2. Scan tool communication verification

1) Turn ON the ignition switch.

2) Check the vehicle specifications and verify the status of communication with the TCCM using a scan tool. Can communication with the TCCM be established?

Yes

=>Go to Communication-related DTC check.

No

Go to Inspection for TCCM communication malfunction.

Refer to "53.Driveline Control 3A.Troubleshooting(4WD models) lost communication with the TCCM (models with radar sensor/ stereo camera)".

Refer to "53.Driveline Control 3A.Troubleshooting(4WD models) lost communication with the TCCM (models without radar sensor and stereo camera)".

3. Communication-related DTC check

1) Observe the DTC information with a scan tool. Is a DTC beginning with U or a DTC related to communication with other control modules set?

Yes

Go to the applicable DTC diagnosis.

No

=>Go to Control module internal-related DTC check.

4. Control module internal-related DTC check

1) Observe the DTC information with a scan tool. Is DTC P0800[45], P0800[A2], or P0800[A3] set?

Yes

Go to the applicable DTC diagnosis.

Note

  • When multiple DTCs are set, start diagnosing in numerical order of the DTCs unless otherwise instructed in the diagnostic step.

Refer to "53.Driveline Control 3A.Troubleshooting(4WD models) DTC P0800[45] Flash ROM Internal Checksum Error".

Refer to "53.Driveline Control 3A.Troubleshooting(4WD models) DTC P0800[A2] Battery Voltage Low Supply".

Refer to "53.Driveline Control 3A.Troubleshooting(4WD models) DTC P0800[A3] Battery Voltage High Supply".

No

=>Go to Other DTC check.

5. Other DTC check

1) Observe the DTC information with a scan tool. Are other DTCs set?

Yes

Go to the applicable DTC diagnosis.

Note

  • When multiple DTCs are set, start diagnosing in numerical order of the DTCs unless otherwise instructed in the diagnostic step.

No

=>Go to Check 4WD warning light illumination check.

6. Check 4WD warning light illumination check

1) Turn OFF the ignition switch.

2) Turn ON the ignition switch.

3) Check the check 4WD warning light in the instrument panel cluster.

Note

  • After the ignition switch is turned ON, the check 4WD warning light illuminates for approximately 3 seconds and then turns OFF.

The light turns ON and then turns OFF.

=>Go to 4WD indicator light and 4WD low indicator light illumination check.

Remains OFF

Go to Check 4WD warning light inoperative.

Refer to "53.Driveline Control 3A.Troubleshooting(4WD models) Check 4WD warning light inoperative".

Remains ON

Go to Check 4WD warning light always on.

Refer to "53.Driveline Control 3A.Troubleshooting(4WD models) Check 4WD warning light always on".

7. 4WD indicator light and 4WD low indicator light illumination check

1) Operate the vehicle in 4H and 4L modes respectively.

2) If the mode does not switch properly, refer to 4WD switch system check and inspect.

Refer to "53.Driveline Control 3A.Troubleshooting(4WD models) 4WD switch system check".

3) Check the 4WD indicator light and 4WD low indicator light.

Note

  • The 4WD indicator light illuminates when switching to 4H or 4L.
  • The 4WD low indicator light illuminates when switching to 4L.

The light turns ON when switching and then turns OFF.

=>Go to Customer's concern check.

The light remains OFF when switching.

Go to 4WD, 4WD low indicator light inoperative.

Refer to "53.Driveline Control 3A.Troubleshooting(4WD models) 4WD, 4WD low indicator light inoperative".

The light remains ON when switching.

Go to 4WD, 4WD low indicator light always on.

Refer to "53.Driveline Control 3A.Troubleshooting(4WD models) 4WD, 4WD low indicator light always on".

8. Customer's concern check

1) Check if the customer's concern is related to the following systems. Is the customer's concern related to the following systems?

  • Engine
  • Transmission

Yes

Go to the applicable control system inspection.

No

=>Go to Symptom check.

9. Symptom check

1) Check if the following symptoms are present. Is there any applicable symptom?

  • Abnormal noise and vibration from propeller shaft
  • Power not being transmitted to the wheels
  • Abnormal noise and vibration from front axle
  • Abnormal noise and vibration from rear axle
  • Intermittent conditions of transfer case control system
  • Oil leakage from front drive axle
  • Oil leakage from rear axle

Yes

Repair the applicable symptom.

Refer to "204.Driveline, Axle 17D.Symptom abnormal noise and vibration from propeller shaft".

Refer to "204.Driveline, Axle 17D.Symptom power not being transmitted to the wheels".

Refer to "204.Driveline, Axle 17D.Symptom abnormal noise and vibration from front axle".

Refer to "204.Driveline, Axle 17D.Symptom abnormal noise and vibration from rear axle".

Refer to "204.Driveline, Axle 17D.Symptom intermittent conditions of transfer case control system".

Refer to "204.Driveline, Axle 17D.Symptom oil leakage from front drive axle".

Refer to "204.Driveline, Axle 17D.Symptom oil leakage from rear axle".

No

Go to Intermittent conditions of transfer case control system.

Refer to "204.Driveline, Axle 17D.Symptom intermittent conditions of transfer case control system".

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