Introduction to the trouble diagnosis of driveline, axle

1. Introduction to the trouble diagnosis of transfer case control system

1. Description of diagnosis

The transfer control failure symptoms are divided into symptoms that can be detected by the DTCs via illumination of the check 4WD warning light, and symptoms that the driver can detect as vehicle problems. Continue the diagnosis in accordance with the diagnostic system check-transfer case controls.

2. About self-diagnosis

The TCCM has a self-diagnosis function and performs the check operation at the time of system start-up to determine the presence of system malfunctions and failed sections. If a malfunction is detected, the check 4WD warning light is illuminated and the DTC is stored.

Caution

  • The illuminated warning lights turn OFF every time the ignition switch is turned OFF, but the DTCs continue to be stored unless the clearing procedure is performed. While driving or for intermittent failures etc., even when the ignition switch is turned from OFF to ON, the control unit determines if the systems are normal at that point, and because the normal illumination pattern may displayed, inspect and repair following the trouble diagnostic flow.

3. Condition for clearing check 4WD warning light and DTC

The TCCM turns OFF the check 4WD warning light when the diagnostic runs and passes. A current DTC is cleared when the diagnostic runs and passes. A history DTC is recorded until the log is cleared with a scan tool. The DTC can be cleared with a scan tool.

2. Introduction to the trouble diagnosis of differential lock

1. Description of diagnosis

The differential lock control failure symptoms are categorized into symptoms that can be detected by the DTCs via illumination of the rear differential lock failure warning light, and symptoms which the driver can recognize as vehicle problems. Continue the diagnosis in accordance with the diagnostic system check - differential lock controls.

2. About self-diagnosis

The rear differential lock control unit has a self-diagnosis function, and it starts diagnosing the system when the ignition switch is turned ON. This continues until the ignition switch is turned OFF. If a malfunction is found, a DTC is set and the rear differential lock failure warning light illuminates.

Caution

  • The illuminated warning lights turn OFF every time the ignition switch is turned OFF, but the DTCs continue to be stored unless the clearing procedure is performed. While driving or for intermittent failures etc., even when the ignition switch is turned from OFF to ON, the control unit determines if the systems are normal at that point, and because the normal illumination pattern may displayed, inspect and repair following the trouble diagnostic flow.

3. Condition for clearing the rear differential lock failure warning light and DTC

When the diagnostic runs and passes, the rear differential lock control unit turns OFF the rear differential lock failure warning light. A current DTC is cleared when the diagnostic runs and passes. A past DTC is recorded until the log is cleared with a scan tool. The DTC can be cleared with a scan tool.

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