• | 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 an ignition 3 voltage circuit and a neutral indicator control circuit. When the neutral mode is selected, 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 detects an open, short to ground or a short to voltage.
• | The ignition is ON. |
• | System voltage is 9-18 volts. |
• | The system monitors the voltage on the neutral indicator control circuit. |
• | If the system detects a voltage of 3 volts or less for 1.5 seconds when the neutral indicator is not commanded, the DTC is logged. |
• | If the system detects a voltage of 4.5 volts or greater when the neutral indicator is commanded, the DTC is logged. |
The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition cycle.
• | The transfer case shift control module clears the DTC if the condition for setting the DTC is not currently present. |
• | A history DTC clears after 100 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.