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.The propshaft RPM can be displayed with a scan tool.
This DTC detects an open, short to ground, short to voltage or faulty sensor.
• | Ignition is ON. |
• | System voltage is 9-16 volts. |
• | Vehicle speed must be 16 km/h (10 mph). |
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:
• | The transmission is NOT in Park/Neutral. |
• | The engine is running. |
• | The front axle is engaged. |
• | The 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, such as correcting wheel slip. |
• | The SERVICE indicator (AWD) 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 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 rear speed sensor low circuit for a short to ground, a high resistance, or an open.
Tests the rear speed sensor high circuit for a short to ground, a high resistance, or an open.
Tests the rear speed sensor high circuit for a short to voltage.
Tests the rear speed sensor low circuit for a short to voltage.
Tests the rear speed sensor hight circuit for a short to the rear speed sensor low circuit.
Step | Action | Value(s) | Yes | No |
---|---|---|---|---|
Schematic Reference: Transfer Case Control Schematics | ||||
1 | Did you perform the Diagnostic System Check - Transfer Case? | -- | Go to Step 2 | |
Does the rpm value vary while driving? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | 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 | |
Did you find an correct the condition? | -- | Go to Step 12 | Go to Step 6 | |
Test the rear speed sensor high circuit for a short to ground, high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 7 | |
Test the rear speed sensor high circuit for a short to voltage. Refer to Testing for a Short to Voltage and Wiring Repairs in Wiring Systems. Did you find an correct the condition? | -- | Go to Step 12 | Go to Step 8 | |
Test the rear speed sensor low circuit for a short to voltage. Refer to Testing for a Short to Voltage and Wiring Repairs in Wiring Systems. Did you find an correct the condition? | -- | Go to Step 12 | Go to Step 9 | |
Test the rear speed sensor high circuit for a short to the rear speed sensor low circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 11 | |
10 | Replace the transfer case rear propshaft speed sensor. Refer to Transfer Case Speed Sensor Replacement . Did you complete the repair? | -- | Go to Step 12 | -- |
11 | Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement . Did you complete the repair? | -- | Go to Step 12 | -- |
12 |
Does the DTC reset? | -- | Go to Step 2 | System OK |