P1585

DTC P1585

CIRCUIT DESCRIPTION
The powertrain control module (PCM) uses output driver modules (ODMs) to control many functions of the engine and the transaxle. The ODMs supply the ground path for a PCM controlled device when the PCM commands the device ON. Each ODM is able to control several outputs. Unlike the quad driver modules (QDMs) used in earlier model years, the ODMs are able to diagnose each output circuit. The PCM monitors the ODMs for circuit conditions that are incorrect for the commanded state of the ODM.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P1585 Cruise Control Inhibit Output Circuit

CONDITIONS FOR RUNNING THE DTC
- The engine speed is 450 RPM or more.
- System voltage is between 8-16 volts.

CONDITIONS FOR SETTING THE DTC
- The PCM detects an improper voltage level on the output circuit that controls the cruise inhibit control circuit.
- The condition exists for at least 10 seconds.

ACTION TAKEN WHEN THE DTC SETS
- The PCM will not illuminate the malfunction indicator lamp (MIL).
- The PCM will store the conditions present when the DTC sets as Failure Records data only.

CONDITIONS FOR CLEARING THE DTC
- The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
- The DTC can be cleared by using the scan tool Clear DTC Information function.

DIAGNOSTIC AIDS
In order to determine whether an improper voltage level exists on the output circuit, the PCM compares the voltage level to the commanded state. For example, a failure condition exists if the PCM detects a low voltage level when the device is commanded OFF, or a high voltage level when the device is commanded ON.

If the condition is intermittent, refer to Testing for Intermittent Conditions and Poor Connections in Diagnostic Aids.

TEST DESCRIPTION

Steps 1 - 10:

The numbers below refer to the step numbers on the diagnostic table.
2. Normally, ignition positive voltage should be present on the control circuit with the PCM disconnected and the ignition turned ON.
3. This step tests for a short to voltage on the control circuit.
9. This vehicle is equipped with a PCM which utilizes an electrically erasable programmable read only memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed.