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Home >> Chevrolet >> 2001 >> Cavalier LS, 2.2 4 >> Repair and Diagnosis >> External Pages >> Different car >> Section 211 (Cruise Control System) >> Diagnostic Information and Procedures >> DTC P1585 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Pontiac Sunfire and 2004 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  Normally, ignition positive voltage should be present on the control circuit with the PCM disconnected and the ignition turned ON.
  2. 3:  Tests for short to voltage on the control circuit.
  3. 8:  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.
DTC P1585

Step Action Value(s) Yes No
Schematic Reference: Cruise Control Schematics 
1 Did you perform the Cruise Control Diagnostic System Check ? - Go to Step 2  Go to Diagnostic System Check - Cruise Control. 
2 
  1. Turn OFF the ignition.
  2. Disconnect the PCM harness connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Using a DMM connected to a good ground, measure the voltage of the cruise control inhibit signal circuit.
Does the voltage measure near the specified value?		 B+ Go to Step 3  Go to Step 4 
3 
  1. Turn OFF the ignition.
  2. Disconnect the cruise control module.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the cruise control inhibit signal circuit with a test lamp that is connected to a good ground.
Does the test lamp illuminate?		 - Go to Step 7  Go to Step 5 
4 Test the cruise control inhibit signal circuit for a open, high resistance or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 6 
5 Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 8 
6 Inspect for poor connections at the harness connector of the cruise control module. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 9 
7 Repair the short to voltage in the cruise control inhibit signal circuit.
Did you complete the repair?		 - Go to Step 10  -
8 
IMPORTANT: The replacement PCM must be programmed. Refer to Service Programming System (SPS) in Vehicle Control Systems.
Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls.		 - Go to Step 10  -
9 Replace the cruise control module. Refer to Cruise Control Module Replacement .
Did you complete the replacement?		 - Go to Step 10  -
10
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within normal cruise control operating conditions.
Does the DTC reset?		 - Go to Step 2  System OK
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