DTC P1585 Cruise Control Inhibit Output Circuit. Chevrolet Malibu 2000

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2000 🢒 Malibu 🢒 DTC 🢒 DTC P1585 Cruise Control Inhibit Output Circuit

Engine Controls Components
Engine Controls Schematics
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice

Circuit Description

Output driver modules (ODMs) are used by the Powertrain Control Module (PCM) to turn on many of the current-driven devices that are needed to control various engine and transaxle functions. Each ODM is capable of controlling up to 7 separate outputs by applying ground to the device which the PCM is commanding ON. DTC P1585 set indicates an improper voltage level has been detected on the output circuit which controls the stepper motor cruise control inhibit circuit.

Conditions for Running the DTC

The ignition is ON.

System voltage is between 9.0 and 18.0 volts.

Conditions for Setting the DTC

•	An improper voltage level has been detected on the output circuit which controls the cruise control inhibit.

•	The above conditions present for at least 30 seconds.

Action Taken When the DTC Sets

The PCM stores conditions which were present when the DTC set as Failure Records only. This information will not be stored as Freeze Frame Records.

Conditions for Clearing the MIL/DTC

•	The DTC becomes history when the conditions for setting the DTC are no longer present.

•	The history DTC clears after 40 malfunction free warm-up cycles.

•	The PCM receives a clear code command from the scan tool.

Diagnostic Aids

Inspect for the following conditions:

Many situations may lead to an intermittent condition. Perform each inspection or test as directed.

Important: : Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing or replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.

•	Loose terminal connection

-	Use a corresponding mating terminal to test for proper tension. Refer to Testing for Intermittent Conditions and Poor Connections , and to Connector Repairs in Wiring Systems for diagnosis and repair.

Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. Refer to Testing for Intermittent Conditions and Poor Connections , and to Connector Repairs in Wiring Systems for diagnosis and repair.

•

Damaged harness--Inspect the wiring harness for damage. If the harness inspection does not reveal a problem, observe the display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the scan tool display may indicate the location of the fault. Refer to Wiring Repairs in Wiring Systems for diagnosis and repair.

•	Inspect the powertrain control module (PCM) and the engine grounds for clean and secure connections. Refer to Wiring Repairs in Wiring Systems for diagnosis and repair.

If the condition is determined to be intermittent, reviewing the Snapshot or Freeze Frame/Failure Records may be useful in determining when the DTC or condition was identified.

Test Description

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

Normally, ignition feed voltage should be present on the control circuit with the PCM disconnected and the ignition turned on.

Inspects for a shorted component or a short to B+ on the control circuit. Either condition would result in a measured current of over 500 milliamps. Also inspects for a component that is going open while being operated, resulting in a measured current of 0 milliamps.

inspects for a short to voltage on the control circuit.

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.

Step

Action

Value(s)

Yes

Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check .

Turn OFF the ignition.
Disconnect the PCM.
Turn ON the ignition.
Use a DMM in order to measure the voltage between the cruise control (CCM) module control circuit at the PCM harness connector and ground.

Is the voltage near the specified value?

B+

Go to Step 3

Go to Step 6

Use the DMM in order to measure the current between the cruise inhibit control circuit at the PCM harness connector and ground.
Monitor the current reading on the DMM for at least 2 minutes.

Does the current reading remain within the specified range?

0.001-0.5 amp

(1-500 mA)

Go to Step 11

Go to Step 4

Turn OFF the ignition.
Disconnect the (CCM) module (leave the PCM disconnected).
Turn ON the ignition.
Use the DMM in order to measure the voltage between the cruise inhibit control circuit and ground.

Does the voltage equal the specified value?

0.0 V

Go to Step 10

Go to Step 5

Locate and repair short to voltage in the cruise inhibit control circuit. Refer to Wiring Repairs in Wiring Systems.

Is action complete?

Go to Step 16

Turn OFF the ignition.
Inspect the ignition feed fuse for the (CCM) module.

Is the fuse open?

Go to Step 7

Go to Step 8

Locate and repair a short to ground in the ignition feed circuit for the CCM module. Refer to Wiring Repairs in Wiring Systems.
Replace the fuse.

Did you complete the repair?

Go to Step 16

Disconnect the cruise control module.
Turn ON the ignition.
Measure the voltage between the ignition feed circuit for the CCM module and ground.

Is the voltage near the specified value?

B+

Go to Step 9

Go to Step 13

Test the cruise inhibit control circuit for an open or a short to ground.
If a problem is found, repair the cruise inhibit control circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 16

Go to Step 10

Inspect for the following conditions:

•	A faulty connection of the cruise inhibit control circuit at the PCM.

•	A faulty connection of the cruise inhibit control circuit at the CCM module.

•	A faulty connection of the CCM module ignition feed circuit at the CCM module.

If a problem is found, replace any loose terminals as necessary. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Did you complete the repair?

Go to Step 16

Go to Step 14

Turn OFF the ignition.
Reconnect the PCM.
Disconnect the CCM module.
Turn ON the ignition.
Connect a test lamp between the cruise inhibit control circuit and the ignition feed circuit at the CCM module harness connector.
Using the scan tool outputs test function, cycle the cruise inhibit output on and off.

Does the test lamp flash on and off?

Go to Diagnostic Aids

Go to Step 12

Test the cruise inhibit control circuit for a faulty connection at the PCM. Refer to Wiring Repairs in Wiring Systems.
If a problem is found, replace the loose terminal.

Did you complete the repair?

Go to Step 16

Go to Step 15

Locate and repair open in ignition feed circuit to the cruise control module. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 16

Replace the cruise control module. Refer to Cruise Control Module Replacement in Cruise Control.

Did you complete the repair?

Go to Step 16

Important: : The replacement PCM must be programmed.

Refer to Powertrain Control Module Replacement/Programming .

Replace the PCM.

Did you complete the repair?

Go to Step 16

Review and record the scan tool Failure Records data.
Clear the DTCs.
Operate the vehicle within the Failure Records conditions.
Using a scan tool, monitor the Specific DTC info for DTC P1585 until the DTC P1585 test runs.

Does the scan tool indicate DTC P1585 failed this ignition?

Go to Step 2

System OK