DTC P1585: Cruise Control Inhibit Output Circuit: Testing
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
- Perform the CRUISE CONTROL DIAGNOSTIC SYSTEM CHECK . Once test has been performed, go to next step.
- Turn off the ignition. Disconnect the PCM harness connector. Turn on the ignition, with the engine off. Using a DMM connected to a good ground, measure the voltage of the cruise control inhibit signal circuit. If the voltage measures near B+, go to next step. If not, go to step 4.
- Turn off the ignition. Disconnect the cruise control harness connector. Turn on the ignition, with the engine off. Probe the cruise control inhibit signal circuit with a test lamp connected to a good ground. If the test lamp illuminates, go to step 7. If not, go to step 5.
- Test the cruise control inhibit signal circuit for a short to ground. If you found and corrected the condition, go to step 10. If not, go to step 6.
- Inspect for poor connections at the harness connector of the PCM. If you found and corrected the condition, go to step 10. If not, go to step 8.
- Inspect for poor connections at the harness connector of the cruise control module. If you found and corrected the condition, go to step 10. If not, go to step 9.
- Repair the short to voltage in the cruise control inhibit signal circuit. If you found and corrected the condition, go to step 10.
- Replace the PCM. See REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. Program the PCM. See POWERTRAIN CONTROL MODULE under PROGRAMMING. If you completed the replacement, go to step 10.
- Replace the cruise control module. See CRUISE CONTROL MODULE under REMOVAL & INSTALLATION. If you completed the replacement, go to step 10.
- Use the scan tool in order to clear the DTCs. Operate the vehicle within normal cruise control operating conditions. If the DTC resets, go to step 2.