GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC P42 Commercial Chassis 🢒 Body and Accessories 🢒 Cruise Control 🢒 Cruise Control Does Not Set or Accelerate

Cruise Control Does Not Set or Accelerate Gasoline

Step

Action

Value(s)

Yes

No

1

Was the Cruise Control System Check performed?

--

Go to Step 2

Go to Cruise Control System Check

2
  1. Connect a Scan Tool .
  2. Turn the igniton switch to the RUN position.
  3. Inspect for vehicle control module (VCM) diagnostic trouble codes (DTC's).

Are there any DTC's found?

--

Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls

Go to Step 3

3
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the cruise control module.
  3. Connect the J 42958 as specified in the user manual.
  4. Turn the ignition switch to the RUN position.
  5. Place the cruise switch in the OFF positon.

Are the BRAKE and IGNITION lamps illuminated on the J 42958 ?

--

Go to Step 5

Go to Step 4

4

Inspect the condition of the 1-3  fuse.

Is the fuse open?

--

Go to Step 23

Go to Step 10

5

Place the cruise control switch in the ON position.

Are the ON/OFF, BRAKE, IGNITION, and CRUISE lamps illuminated on the J 42958 ?

--

Go to Step 6

Go to Step 12

6

Press and hold the set/coast (S/C) switch.

Does the SET/COAST lamp illuminate on the J 42958 ?

--

Go to Step 7

Go to Step 15

7

Press and hold the res/acc (R/A) switch.

Does the RES/ACC lamp illuminate on the J 42958 ?

--

Go to Step 8

Go to Step 17

8

Press and hold the brake pedal.

Does the BRAKE LIGHTS lamp illuminate on the J 42958 ?

--

Go to Step 9

Go to Step 19

9
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the J 42958 .
  3. Leave the cruise control module disconnected.
  4. Connect a scan tool.
  5. Connect a J 39200 , set to AC voltage and on the Hz scale, from the cruise control module harness connector, cavity K to cavity E. Refer to Using Connector Test Adapters in Wiring Systems.
  6. Turn the ignition switch to the ON position.
  7. Raise and suitably support the vehicle.
  8. Inspect the vehicle speed on the scan tool and inspect the J 39200 while rotating one of the vehicle drive wheels.

Is the frequency within the specified value?

1.11 Hz/mph

Go to Step 35

Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls

10
  1. Disconnect the J 42958 .
  2. Connect a test light from the cruise control module connector, cavity F to ground. Refer to Using Connector Test Adapters in Wiring Systems.

Does the test light illuminate?

--

Go to Step 11

Go to Step 24

11

Connect a test light from the cruise control module connector, cavity E to cavity F.

Does the test light illuminate?

--

Go to Step 35

Go to Step 25

12
  1. Disconnect the J 42958 .
  2. Connect a test light from the cruise control module connector, cavity A to ground.

Does the test light illuminate?

--

Go to Step 35

Go to Step 13

13

Connect a test light from the cruise control switch connector, cavity B to ground.

Does the test light illuminate?

--

Go to Step 26

Go to Step 14

14

Connect a test light from the cruise control switch connector, cavity A to ground.

Does the test light illuminate?

--

Go to Step 33

Go to Step 27

15
  1. Disconnect the J 42958 .
  2. Connect a test light from the cruise control module connector, cavity B to ground.
  3. Press and hold the set/coast (S/C) switch.

Does the test light illuminate?

--

Go to Step 35

Go to Step 16

16
  1. Connect a test light from the cruise control switch connector, cavity D to ground.
  2. Press and hold the set/coast (S/C) switch.

Does the test light illuminate?

--

Go to Step 28

Go to Step 33

17
  1. Disconnect the J 42958 .
  2. Connect a test light from the cruise control module connector, cavity C to ground.
  3. Press and hold the res/acc (R/A) switch.

Does the test light illuminate?

--

Go to Step 35

Go to Step 18

18
  1. Connect a test light from the cruise control switch connector, cavity C to ground.
  2. Press and hold the res/acc (R/A) switch.

Does the test light illuminate?

--

Go to Step 29

Go to Step 33

19
  1. Disconnect the J 42958 .
  2. Connect a test light from the cruise control module connector, cavity G to ground.

Does the test light illuminate?

--

Go to Step 20

Go to Step 30

20

Connect a test light from the cruise control module connector, cavity D to ground.

Does the test light illuminate?

--

Go to Step 35

Go to Step 21

21

Connect at test light from the torque converter clutch (TCC)/stop lamp switch connector, cavity D to ground.

Does the test light illuminate?

--

Go to Step 32

Go to Step 22

22

Connect a test light from the TCC/stop lamp switch connector, cavity C to ground.

Does the test light illuminate?

--

Go to Step 34

Go to Step 31

23

Repair the short to ground in CKT 241 (BRN) to the cruise control module connector, cavity F and replace the fuse.

Did you complete the repair?

--

Go to Cruise Control System Check

--

24

Repair the open in CKT 241 (BRN) to the cruise control module connector, cavity F.

Did you complete the repair?

--

Go to Cruise Control System Check

--

25

Repair the open in CKT 451 (BLK/WHT) from the cruise control module connector, cavity E to G 108.

Did you complete the repair?

--

Go to Cruise Control System Check

--

26

Repair the open in CKT 397 (GRY) to the cruise control module connector, cavity A.

Did you complete the repair?

--

Go to Cruise Control System Check

--

27

Repair the open in CKT 241 (BRN) to the cruise control switch connector, cavity A.

Did you complete the repair?

--

Go to Cruise Control System Check

--

28

Repair the open in CKT 84 (BLU) to the cruise control module connector, cavity B.

Did you complete the repair?

--

Go to Cruise Control System Check

--

29

Repair the open in CKT 87 (GRY/BLK) to the cruise control module connector, cavity C.

Did you complete the repair?

--

Go to Cruise Control System Check

--

30

Repair the open in CKT 20 (LT BLU) to the cruise control module connector, cavity G.

Did you complete the repair?

--

Go to Cruise Control System Check

--

31

Repair the open in CKT 241 (BRN) to the TCC/stop lamp switch connector, cavity C.

Did you complete the repair?

--

Go to Cruise Control System Check

--

32

Repair the open in CKT 420 (PPL) to the cruise control module connector, cavity D.

Did you complete the repair?

--

Go to Cruise Control System Check

--

33

Replace the cruise control switch. Refer to Multifunction Turn Signal Lever Replacement - On Vehicle in Steering Wheel and Column-Tilt.

Did you complete the repair?

--

Go to Cruise Control System Check

--

34

Replace the TCC/stop lamp switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes.

Did you complete the repair?

--

Go to Cruise Control System Check

--

35
  1. Inspect the cruise control module connector for proper terminal contact.
  2. Repair any poor terminal contact that you find.
  3. If no poor terminal contact was found, replace the cruise control module.

Did you complete the repair?

--

Go to Cruise Control System Check

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Cruise Control Does Not Set or Accelerate Diesel

Refer to Cruise Control Diagnosis in Engine Controls--6.5L--L65