B3670

DTC B3670

Circuit Description
The folding top control (FTC) module monitors the folding top pump motor temperature, checking the temperature once every 300 milliseconds. The FTC module supplies a 5-volt reference and monitors the sensor low reference voltage from the thermistor located in the folding top pump motor. As the pump motor warms up, the thermistor resistance will decrease. The FTC module monitors the voltage drop across the thermistor and uses that to calculate the temperature of the pump motor. When the FTC module detects the temperature to be above the operating range, a DTC will be set.

DTC Descriptor
The diagnostic procedure supports the following DTC.

DTC B3670 Pump Motor Temperature Sensor Circuit

Conditions for Running the DTC
^ The battery voltage is between 9-16 volts.
^ The FTC module is in Accessory, RUN, or RAP.

Conditions for Setting the DTC
The FTC module detects that the folding top pump motor temperature is over 95�C (203�F).

Action Taken When the DTC Sets
^ Stores a current and history DTC B3670 in the FTC module.
^ The folding top operation is suspended.
^ A class 2 message is sent to the driver information center: TOP MOTOR OVER TEMP, as the folding top switch is pressed.

Conditions for Clearing the DTC
^ This DTC will become history once the pump motor temperature is below 90�C (194�F).
^ A history DTC will clear after 50 consecutive ignition cycles without a fault present.
^ History and current DTC can be cleared using the scan tool.

Diagnostic Aids
The following conditions may cause an intermittent malfunction:

^ An intermittent sticking or binding linkage condition can cause excessive current draw resulting in a temperature out of range.
^ The folding top pump motor or thermistor is shorted internally.

If the DTC does not reset after the code is cleared, then the switch may be the intermittent fault.