GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Prizm 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Cruise Control System Check

Scan Tool Diagnostics

Verify that the CHECK ENGINE lamp is not lit. If the lamp is lit, check for DTCs first before diagnosing cruise control problems. Four DTCs could impact cruise control operation. These DTCs are the following:

    • P0505 -- Idle Signal.
    • P0758 -- Shift solenoid 2 signal.
    • P0120 -- Throttle position sensor (TPS).
    • P0500 -- Vehicle speed sensor (VSS).
    • P1780 -- Park/Neutral Position (PNP) switch.

Scan Tool diagnostics are not available for the Prizm cruise control system.

Flash DTC Diagnostics

Flash DTC diagnostics read current DTCs. You can enable FLASH DTC diagnostics by locating the Data Link Connector (DLC) which is in the LH rear of the engine compartment, mounted to the strut tower. Connect a jumper to terminal 11 (Tc) and terminal 3 (E1) with the ignition switch set to the ON position. This action pulls the cruise control module (CCM) terminal 5 to ground and signals the CCM to enter the FLASH DTC diagnostic display mode.

The CCM displays the DTCs by flashing the cruise control indicator lamp. Each DTC that is displayed consists of the following:

  1. A series of flashes which represent the tens (first) DTC digit
  2. A 2.5 second pause
  3. A series of flashes which represent the ones (second) DTC digit

For example, a FLASH DTC of 32 would be displayed as: three flashes, a 2.5 second pause, and two more flashes. Each DTC is flashed once before moving on to the next DTC. After all the DTCs are displayed, the entire DTC sequence is continually repeated until you remove the jumper from the DLC.

If there are no DTCs present, the CCM will flash the CRUISE indicator lamp lamp continuously. This indicates that FLASH DTC diagnostics have been enabled. The SDM will continue to flash the Cruise indicator lamp until the jumper wire is removed from the DLC.

Flash Code DTC Table

Flash Code

Diagnostic Area

Failure

DTC

11

Servo Motor Circuit

Short

DTC 11 Servo Motor Circuit Shorted

12

Servo Magnetic Clutch

Open or short

DTC 12 Magnetic Clutch CKT Open or Short to Ground

14

Servo

Mechanical malfunction

DTC 14 Motor CKT Open or S/Gnd

15

Servo Motor Circuit

Open

DTC 11 Servo Motor Circuit Shorted

21

Vehicle Speed Sensor (VSS)

Open or short

DTC 21 VSS CKT Open or S/Gnd

23

Vehicle Speed Sensor(VSS)

Vehicle speed input 16 km/h (10 mph) lower than set speed

DTC 23 Speed Drops More Than 10 mph

32

Cruise Control Switch

Short

DTC 32 Cruise Control Switch Shorted

34

Cruise Control Switch

Incorrect voltage

DTC 34 Abnormal Sgnl From Cruise Control Switch

41

Cruise Control Module

Continuous output to actuator

DTC 41 Continuous CCM Output to Actuator

42

Power Supply

Power supply voltage less than 10V

DTC 42 Low System Voltage

43

Cruise Control Module

Power supply line is abnormal

DTC 43 Abnormal Ignition Power Supply

Diagnostic Aids

Check for the following:

    • Open ECU-IG fuse.
    • Open ECU-B fuse.
    • Open STOP fuse.
    • Clean, tight G203.

In the case of an intermittent malfunction, inspect the wiring harness or component connectors 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

Number(s) below refer to the step number(s) on the Diagnostic Table.

  1. This step commands the cruise control module to enter the diagnostic mode and tests the cruise control switch in the SET/COAST position.

    2.

  2. Steps 4-5 test the cruise control switch in the RES/ACC position.

    3.

  3. This step tests the brake pedal stop lamp switch.

    4.

  4. This step tests the PNP switch.

    5.

  5. This step tests the clutch pedal position (CPP) interrupt switch.

    6.

  6. This step tests the vehicle speed sensor (VSS).

    7.

  7. This step tests for any flash code DTCs.

    8.

  8. This step tests for either a short between the CCM and the Instrument cluster assembly or a faulty CCM.

    9.

  9. This step tests the ability of the cruise control module to delay overdrive (OD) upshift when holding set speed under vehicle load.

Step

Action

Value(s)

Yes

No

1
  1. Turn ignition to LOCK.
  2. Wait 10 seconds.
  3. Turn ignition switch to ON.

Is the CRUISE indicator lamp OFF?

--

Go to Step 2

Go to Step 12

2

Depress the CRUISE ON-OFF switch and release.

Is the CRUISE indicator lamp ON steady?

--

Go to Step 3

Go to Step 13

3

  1. Turn ignition switch to LOCK.
  2. Wait 5 seconds.
  3. Turn ignition switch to ON.
  4. If the vehicle has an automatic transaxle, Move the gear shift lever to the drive (D) position.
  5. Move the cruise control switch downward to the SET/COAST position and hold.
  6. Press the CRUISE ON-OFF switch and release.

Does the CRUISE indicator lamp flash twice, pause, and then repeat this sequence?

--

Go to Step 4

Go to DTC 32 Cruise Control Switch Shorted

4

Move the cruise control switch upward to the RES/ACC position.

Does the CRUISE indicator lamp flash 3 times, pause, and then repeat this sequence?

--

Go to Step 5

Go to DTC 32 Cruise Control Switch Shorted

5

Pull and release the cruise control switch to the CANCEL position while observing the CRUISE control indicator.

Is the CRUISE indicator lamp OFF when the cruise control switch is pulled to the CANCEL position, and ON when the cruise control switch is released?

--

Go to Step 6

Go to DTC 32 Cruise Control Switch Shorted

6

Press and release the brake pedal while observing the CRUISE indicator lamp.

Is the CRUISE indicator lamp OFF with the brake pedal is pressed, and ON with the brake pedal released?

--

Go to Step 7

Go to Step 35

7

Is the vehicle equipped with an automatic transaxle?

--

Go to Step 8

Go to Step 9

8

Move the Automatic Transaxle Control Lever to neutral (N), then to drive (D) while observing the CRUISE indicator lamp.

Is the CRUISE indicator lamp ON with the manual selector in drive (D), and OFF in neutral (N)?

--

Go to Step 10

Go to Step 26

9

Press the clutch pedal while observing the CRUISE indicator lamp.

Is the CRUISE indicator lamp OFF when the clutch pedal is pressed and ON when the clutch pedal is released?

--

Go to Step 10

Go to Step 28

10

  1. Turn ignition switch to LOCK.
  2. Wait 5 seconds.
  3. Start the vehicle.
  4. If the vehicle has an automatic transaxle, Move the gear shift lever to the drive (D) position.
  5. Move the cruise control switch downward to the SET/COAST position and hold.
  6. Press the CRUISE ON-OFF switch and release.
  7. Accelerate driving wheels to 40 km/h (25 mph) while observing the CRUISE indicator lamp.

Does the CRUISE indicator lamp flash?

--

Go to Step 43

Go to DTC 21 VSS CKT Open or S/Gnd

11

  1. Turn ignition switch to LOCK.
  2. Connect a J 36169-A between terminal 3 (E1) and terminal 11 (Tc) of the data link connector which is located in the LH rear of the engine compartment on the strut tower.
  3. Turn the ignition switch to ON.

Does the cruise control indicator flash at a steady, rapid rate?

--

Go to Step 34

Go to Step 14

12

  1. Turn ignition switch to LOCK.
  2. Disconnect the cruise control module connector located next to the instrument panel compartment on the RH side of the instrument panel. Refer to Cruise Control Module Replacement .
  3. Turn the ignition switch to ON.

Is the CRUISE indicator lamp ON?

--

Go to Step 18

Go to Step 17

13

Does the CRUISE indicator lamp flash ON and OFF?

--

Go to Step 11

Go to Cruise Control Inoperative, Speedometer Operative

14

Does the CRUISE indicator lamp flash any DTCs?

--

Go to the Flash Code DTC Table located in the above Diagnostic Aids section

Go to Step 15

15
  1. Turn ignition to the LOCK position.
  2. Disconnect the cruise control module connector.
  3. Test for continuity between terminal 5 of the cruise control module connector and terminal 11 (Tc) of the DLC.

Does continuity exist?

--

Go to Step 17

Go to Step 19

16

  1. Start engine.
  2. Set the overdrive (OD) switch to the ON position
  3. Accelerate vehicle to 80 km/h (50 mph).
  4. press the cruise control switch to the CRUISE ON-OFF position and set speed to engage cruise control.
  5. Make sure transaxle is in 4th gear (OD).
  6. Press and hold the parking brake release button while pulling up the parking brake gradually (to induce load drag) up to the moment that the transaxle downshifts into 3rd gear.
  7. Immediately release the parking brake and notice a 2 second delay before the transaxle upshifts from 3rd gear into OD.

Did the transaxle delay OD upshift?

--

Go to Step 11

Go to DTC P0758 Shift Solenoid #2 Electrical

17
  1. Inspect the cruise control module terminal for poor contact.
  2. Inspect other wires and connectors for proper connections.
  3. If no circuitry problem is found, replace the cruise control module.

Refer to Cruise Control Module Replacement .

Is the replacement complete?

--

Go to Step 34

--

18

Repair the short to ground in the GRN/RED wire between the cruise control module connector terminal 4 and terminal 7 of connector C4 of the instrument cluster assembly. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

19

Repair the open in the PNK/BLK wire between the cruise control module connector terminal 5 and terminal 11 of the DLC connector. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

20
  1. Turn ignition to LOCK.
  2. Disconnect the cruise control module (CCM) connector located next to the instrument panel compartment on the RH side of the instrument panel. Refer to Cruise Control Module Replacement .
  3. Test for continuity between terminal 13 of the cruise control module connector and terminal 3 of connector C3 of the Powertrain Control Module (PCM).

Does continuity exist?

--

Go to Step 22

Go to Step 21

21

Repair the open between the BLU/WHT wire of terminal 13 of the cruise control module connector and terminal 3 of connector C3 of the PCM. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 34

--

22

With the CCM and PCM connectors still disconnected. Test for continuity between terminal 14 of the CCM and terminal 12 of connector C2 of the PCM.

Does continuity exist?

--

Go to Step 24

Go to Step 23

23

Repair the open between the RED/WHT wire of terminal 14 of the CCM and terminal 12 of connector C2 of the PCM. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 34

--

24

With the CCM and PCM connectors still disconnected. Test for continuity between terminal 6 of the CCM and terminal 22 of connector C1 of the PCM.

Does continuity exist?

--

Go to Step 16

Go to Step 25

25

Repair the open between the BRN/YEL wire of terminal 6 of the CCM and terminal 22 of connector C1 of the PCM. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 34

--

26
  1. Turn the ignition switch to LOCK.
  2. Disconnect the cruise control module connector which is located next to the instrument panel compartment on the RH side of the instrument panel. Refer to Cruise Control Module Replacement .
  3. Test for voltage between terminal 3 of the cruise control module connector and ground.
  4. Press firmly on the brake pedal.
  5. Shift the manual selector to the drive (D) position.
  6. Turn the ignition switch to ON.

Is the voltage within the specified range?

10-12 V

Go to Step 17

Go to Step 27

27

Repair the open in the BLU/BLK wire between terminal 3 of the cruise control module and SP251. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 34

--

28
  1. Turn the ignition switch to LOCK.
  2. Disconnect the cruise control module connector which is located next to the instrument panel compartment on the RH side of the instrument panel. Refer to Cruise Control Module Replacement .
  3. Connect a J 35616-200 between terminal 3 of the cruise control module connector and ground.
  4. Turn the ignition switch to ON.

Is the test lamp OFF when the clutch pedal is pressed and ON when the clutch pedal is released?

--

Go to Step 17

Go to Step 29

29
  1. Turn the ignition switch to LOCK.
  2. Connect a test lamp between terminal 2 of the clutch pedal position (CPP) interrupt switch and ground.

Is the test lamp OFF when the clutch pedal is pressed and ON when the clutch pedal is released?

--

Go to Step 30

Go to Step 31

30

Repair the open between terminal 3 of the cruise control module connector and terminal 2 of the clutch pedal position (CPP) switch connector. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 34

--

31
  1. Turn the ignition switch to LOCK.
  2. Connect a test lamp between terminal 1 of the clutch pedal position (CPP) interrupt switch connector and ground.

Does the test lamp light?

--

Go to Step 32

Go to Step 33

32

Adjust or replace the clutch pedal position (CPP) switch. Refer to Clutch Pedal Position Switch Replacement .

Is the adjustment or replacement complete?

--

Go to Step 34

--

33

Repair the open between terminal 1 of the clutch pedal position (CPP) switch connector and terminal 2 of connector C4 of junction block 2. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 34

--

34
  1. Turn the ignition switch to LOCK.
  2. Reconnect all connector(s).
  3. Turn the ignition switch to ON.
  4. Observe the CRUISE indicator lamp.
  5. Press the cruise control switch to the CRUISE ON-OFF position and release.
  6. Observe the CRUISE indicator lamp.

Was the CRUISE indicator lamp OFF when the ignition switch was turned to ON, then the CRUISE indicator lamp turned ON when the cruise control switch was pressed to the CRUISE ON-OFF position and released?

--

System OK

Go to Step 1

35
  1. Disconnect the cruise control module connector. Refer to Cruise Control Module Replacement .
  2. Depress the brake pedal and hold.
  3. Test for continuity between terminal 2 of the cruise control module connector and terminal 7 of connector C 3 of the junction block 2

Is there continuity?

--

Go to Step 36

Go to Step 37

36

Release the brake pedal while still testing for continuity.

Is there continuity after releasing the brake pedal?

--

Go to Step 38

Go to Step 17

37

Test for continuity between terminal 1 and terminal 2 of the stoplamp switch.

Is there continuity when the brake pedal is pressed?

--

Go to Step 39

Go to Step 38

38

Adjust or replace the stoplamp switch. Refer to Stop Lamp Switch Adjustment or Stop Lamp Switch Replacement in Hydraulic Brakes.

Is the adjustment or replacement complete?

--

System OK

--

39

Test for continuity between terminal 2 of the cruise control module connector and terminal 1 of the stoplamp switch.

Is there continuity?

--

Go to Step 40

Go to Step 42

40

Test for continuity between terminal 7 of connector C3 of junction block 2 and terminal 2 of the stoplamp switch.

Is there continuity?

--

Go to Step 35

Go to Step 41

41

Repair the RED/WHT wire between terminal 7 of connector C3 of junction block 2 and terminal 2 of the stoplamp switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

System OK

--

42

Repair the GRN/WHT wire between terminal 2 of the cruise control module connector and terminal 1 of the stoplamp switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

System OK

--

43

Determine if vehicle is equipped with a 3 speed or 4 speed automatic transaxle (4 speed transaxles have an overdrive switch on the automatic transaxle control lever).

Does vehicle have a 4 speed automatic transaxle?

--

Go to Step 16

Go to Step 11