C1761

CIRCUIT DESCRIPTION
The ESC module supplies 8 volts to the position sensors. The position sensors use the supplied 8 volts to produce an analog output range of 0 - 5 volts. The ESC module monitors the position sensor output voltage for an out of range condition. The position sensor normal operating range is 0.35 - 4.75 volts. An out of range condition is current if the data is not within this range.

CONDITIONS FOR SETTING THE DTC
- The ESC module senses position sensor output voltage under 0.35 volts or over 4.75 volts.
- The condition must be detected for 1 second in 4 consecutive ignition cycles.

ACTION TAKEN WHEN THE DTC SETS
- Stores a DTC C1761 in the ESC memory.
- Provides shocks absorber solenoid control based on the vehicle speed only.
- Sends a message to the IPC to display the SERVICE RIDE CONTROL message.

CONDITIONS FOR CLEARING THE DTC
- A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present. The ESC module senses the correct position sensor output voltage (0.35 - 4.75 volts) for 1 second.
- Use the IPC clearing DTC feature.
- Using a scan tool.

DIAGNOSTIC AIDS
- The following conditions may cause an intermittent malfunction to occur:
- An intermittent open or short in the RF position sensor circuit.
- Bent, disconnected, or damaged position sensor linkage.
- When using a scan tool in order to read position sensor voltage, always make sure the vehicle is sitting with the full vehicle weight on its wheels. Measuring position sensor voltage with the vehicle raised and the wheels hanging may lead to incorrect diagnosis.
- The ESC module uses an ignition cycle counter diagnostic approach to set this DTC. This requires the ESC module to detect the malfunction 4 times before setting the DTC. To disable this feature, use a scan tool to clear all DTCs before performing diagnostic procedures.
- The malfunction may be set due to a DTC C1768 Position Sensor Supply Overcurrent. If this is the case, go to DTC C1768 table before proceeding with DTC C1761.
- An intermittent DTC C1761 may produce a random firm ride condition.
- If the DTC is a history DTC, the problem may be intermittent. Using a scan tool, monitor the position sensor voltage while moving the wiring and the connectors. This can often cause the malfunction to occur.

TEST DESCRIPTION








DTC C1761 RF Position Sensor

The numbers below refer to the step numbers on the diagnostic table:
2. This step checks for a DTC C1768. This DTC must be diagnosed first before continuing to diagnose a DTC C1761.
3. This step measures the RF position sensor voltage with a scan tool and checks if the voltage readings are within a specified range.
4. This step checks for any visual damage to the RF position sensor.
5. This step checks if the ESC module is able to provide supply voltage to the RF position sensor.
6. This step checks if the ESC module is able to detect a change in position sensor voltage. The voltage reading will change from 0 volts bumper removed) to 7.0 - 8.5 volts bumper applied).
7. This step checks for an intermittent malfunction and requests a thorough inspection of the related RF position sensor circuit wiring and connectors.