P0586

P0586-SPEED CONTROL VENT CONTROL CIRCUIT

P0586 - Speed Control Vent Control Circuit:

WHEN MONITORED
Engine running, the speed control switched on and the brake is not pressed..

SET CONDITION
The PCM detects an open or short to voltage in the Speed Control Vent Control circuit for more than 0.325 of a second. One Trip Fault. Three good trips to turn off the MIL.

POSSIBLE CAUSES
- (V35) S/C vent sol control circuit open
- (V35) S/C vent sol control circuit shorted to ground
- Speed control vent solenoid
- PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

DIAGNOSTIC TEST

1. SPEED CONTROL VENT CONTROL

NOTE: If this code is setting on a vehicle that doesn't have a S/C Servo, flash the correct code into the PCM or the wrong PCM may have previously been installed.

Ignition on, engine not running.
With the scan tool, actuate the Speed Control Vent Solenoid and note operation.

Q: Does the Speed Control Vent Solenoid actuate properly?

YES: Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Component Tests and General Diagnostics
Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
NO: Go To 2

2. SPEED CONTROL VENT SOLENOID




Turn the ignition off.
Disconnect the Speed Control Servo harness connector.
Ignition on, engine not running.
With the scan tool, actuate the Speed Control Vent Solenoid.
Using a 12-volt test light connected to ground, probe the (V35) S/C Vent Solenoid Control circuit in the Speed Control Servo harness connector.

Q: Does the test light illuminate brightly and flash?

YES: Replace the Speed Control Servo.
Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
NO: Go To 3

3. (V35) VENT CONTROL CIRCUIT OPEN




Turn the ignition off.
Disconnect the C3 PCM harness connector.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

Measure the resistance of the (V35) S/C Vent Control circuit from the Speed Control Servo harness connector to the appropriate terminal of special tool #8815.

Q: Is the resistance below 5.0 ohms?

YES: Go To 4
NO: Repair the excessive resistance in the (V35) S/C Vent Sol Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

4. (V35) VENT SOL CONTROL CIRCUIT SHORTED TO GROUND




Measure the resistance between ground and the (V35) S/C Vent Solenoid Control circuit in the Speed Control Servo harness connector.

Q: Is the resistance below 100 ohms?

YES: Repair the short to ground in the (V35) S/C Vent Sol Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
NO: Go To 5

5. PCM

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Q: Were there any problems found?

YES: Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
NO: Replace and program the Powertrain Control Module.
Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test