GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2001 🢒 Prizm 🢒 Body and Accessories 🢒 Cruise Control 🢒 DTC 011 or 015

Circuit Description

The cruise control module applies voltage and ground to both the open and close sides of the cruise control servo motor as driving conditions demand changing throttle settings.

Diagnostic Aids

Check for the following:

    • Cruise control cable for binding or broken cable
    • Short to ground in the RED/GRN or RED/BLK wires between the cruise control module and the servo

An intermittent malfunction may be caused by a fault in the servo motor electrical circuit. Inspect the wiring harness and components for any of the following conditions:

    • Backed out terminals
    • Improper mating of terminals
    • Broken electrical connectors locks
    • Improperly formed or damaged terminals
    • Faulty terminal to wire connections
    • Physical damage to the wiring harness
    • A broken wire inside the insulation
    • Corrosion of electrical connections, splices, or terminals

Repair any electrical circuit faults that were found. Refer to Wiring Repairs in Wiring Systems.

Test Description

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

  1. This step tests to see if the servo motor has the proper resistance.

    2.

  2. This step tests to see if the servo motor has the proper resistance.

    3.

  3. This step tests for proper movement of the actuator arm with the magnetic clutch energized.

    4.

  4. This step tests for proper movement of the actuator arm with the magnetic clutch energized.

Step

Action

Value(s)

Yes

No

Schematic Reference: Cruise Control Schematics

1

Did you perform the Diagnostic System Check - Cruise Control ?

--

Go to Step 2

Go to Diagnostic System Check - Cruise Control

2
  1. Turn the ignition switch to LOCK.
  2. Disconnect the cruise control servo connector. Refer to Cruise Control Servo Replacement for access.
  3. Turn ON the ignition, with the engine OFF.
  4. Test for a short to voltage or open in the Coast+ control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 14

Go to Step 3

3

Test for a short to voltage or open in the ACC+ control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 14

Go to Step 4

4

  1. Disconnect the cruise control servo connector.
  2. Measure resistance as follows:
    3. • Connect the positive lead of the DMM to terminal 1 of the cruise control servo.
    • Connect the negative lead of the DMM to terminal 2 of the cruise control servo.

Is the resistance within the specified range?

2-4 ohms

Go to Step 5

Go to Step 11

5

Measure resistance as follows:

    • Connect the positive lead of the DMM to terminal 2 of the cruise control servo.
    • Connect the negative lead of the DMM to terminal 1 of the cruise control servo.

Is the resistance equal to the specified value?

∞

Go to Step 6

Go to Step 11

6
  1. Disconnect the cruise control cable from the cruise control servo.
  2. Move the actuator arm back and forth.

Does the actuator arm move freely in both directions?

--

Go to Step 7

Go to Step 11

7

With the cruise control servo still disconnected.

  1. Connect a fused jumper from ground to terminal 4 of the cruise control servo.
  2. Connect a fused jumper from B+ to terminal 3 of the cruise control servo.
  3. Attempt to move the actuator arm.

Does the actuator arm move?

--

Go to Step 8

Go to Step 11

8

  1. Leave the ground and power connected to the servo.
  2. Connect a fused jumper between ground and terminal 2 of the cruise control servo.
  3. Connect a fused jumper between B+ and terminal 1.
  4. Observe the actuator arm.

Does the actuator arm move smoothly to the full open position?

--

Go to Step 9

Go to Step 11

9

  1. Reverse the power and ground connections on terminals 1 and 2.
  2. Observe the actuator arm.

Does the actuator arm move smoothly to the close position?

--

Go to Step 10

Go to Step 11

10

Inspect for poor connections at the harness connector of the cruise control module. 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 14

Go to Step 12

11

Inspect for poor connections at the harness connector of the cruise control servo. 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 14

Go to Step 13

12

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

Did you Complete the replacement?

--

Go to Step 14

--

13

Replace the cruise control servo. Refer to Cruise Control Servo Replacement .

Did you Complete the replacement?

--

Go to Step 14

--

14
  1. Turn the ignition switch to LOCK.
  2. Remove the STOP fuse.
  3. Remove the ECU-B fuse.
  4. Wait 30 seconds.
  5. Reinstall STOP and ECU-B fuses.
  6. Turn ON the ignition, with the engine OFF.
  7. Using the jumper, connect the DLC terminals Tc and E1.

Does the CRUISE indicator lamp flash the same trouble code?

--

Go to Step 2

System Ok