The Rear Propshaft Speed Sensor is a Permanent Magnet (PM) generator. The PM generator produces a pulsing AC voltage. The AC voltage level and number of pulses increases as speed increases. The module converts the pulsating AC voltage to a propshaft RPM which is used for calculations, and to monitor the difference between the front and rear propshaft speed. The propshaft RPM can be displayed with a scan tool.
This DTC detects an open , short to ground, short to voltage or faulty sensor.
The system will log the DTC if the rear propshaft input indicates a speed of less than 16 RPM for 30 seconds while all of the following are true:
• | Transmission is NOT in Park/Neutral |
• | Engine is running |
• | Front axle is engaged |
• | Vehicle Speed On Class 2 Data bus exceeds 10 mph |
• | All Shifts to AUTO 4WD mode will be disabled. If the current mode is AUTO 4WD , the system will not allow any further adaptive events (correct wheel slip). |
• | The SERVICE indicator (4WD/AWD) lamp will be latched ON 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 no longer exists. |
• | A history DTC will clear after 100 consecutive ignition cycles without a fault present. |
• | History DTCs can be cleared using a scan tool. |
The number(s) below refer to the step number(s) on the diagnostic table.
Tests to see if the malfunction is intermittent.
Tests the internal resistance of the propshaft speed sensor.
Tests to see if the propshaft speed sensor can generate a sufficient amount of AC voltage.
Tests the RSS LO circuit for a short to ground, high resistance, or an open.
Tests the RSS HI circuit for a short to ground, high resistance, or an open.
Tests the RSS HI circuit for a short to voltage.
Tests the RSS LO circuit for a short to voltage.
Tests the RSS HI circuit for a short to the RSS LO circuit.
Step | Action | Value(s) | Yes | No |
---|---|---|---|---|
1 | Was the Transfer Case Diagnostic System Check performed? | -- | Go to Step 2 | Go to Diagnostic System Check |
Does the rpm value vary while driving? | -- | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 | |
Is the resistance reading within the specified values? | 1300-2700 ohms | Go to Step 4 | Go to Step 10 | |
Is the voltage reading greater than the specified value? | 0.5 V AC | Go to Step 5 | Go to Step 10 | |
Was the condition found and corrected? | -- | Go to Step 12 | Go to Step 6 | |
Test the RSS HI circuit for a short to ground, high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring System. Was the condition found and corrected? | -- | Go to Step 12 | Go to Step 7 | |
Test the RSS HI circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Was the condition found and corrected? | -- | Go to Step 12 | Go to Step 8 | |
Test the RSS LO circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Was the condition found and corrected? | -- | Go to Step 12 | Go to Step 9 | |
Test the RSS HI circuit for a short to the RSS LO circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Was the condition found and corrected? | -- | Go to Step 12 | Go to Step 11 | |
10 | Replace the transfer case rear propshaft speed sensor. Refer to Speed Sensor Replacement . Is the repair complete? | -- | Go to Step 12 | -- |
11 | Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement . Is the repair complete? | -- | Go to Step 12 | -- |
12 |
Does the DTC reset? | -- | Go to Step 2 | System OK |