• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
The Neutral indicator circuit consists of a ignition 3 voltage circuit and a Neutral indicator control circuit. When the Neutral mode has been selected by the driver, current is supplied to the Neutral indicator by the ignition 3 voltage circuit, traveling through the Neutral indicator LED at which time the transfer case shift control module supplies the ground through the Neutral indicator control circuit. This DTC indicates an open, short to ground or a short to voltage.
• | The ignition is ON. |
• | The system voltage is 9-18 volts. |
• | The system monitors the voltage on the Neutral indicator control circuit. |
• | If the system detects a voltage 3.5 volts or less when the Neutral indicator is not commanded, the DTC is logged. |
• | If the system detects a voltage 3.5 volts or more when the Neutral indicator is commanded, the DTC is logged. |
The SERVICE 4WD indicator will remain illuminated for the remainder of the current ignition cycle.
• | The transfer case shift control module will clear the DTC if the condition for setting the DTC is not currently present. |
• | A history DTC will clear after 33 consecutive ignition cycles without a fault present. |
• | History DTCs can be cleared using a scan tool. |
Transfer Case Control Schematics
Transfer Case Description and Operation
Control Module References for scan tool information.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.