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Test description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 7:  This step tests the cruise control set/coast switch signal circuit for an open or for a high resistance.
  2. 8:  This step tests the cruise control resume/accel switch signal circuit for an open or for a high resistance.
  3. 9:  This step tests the ignition 1 voltage circuit for an open, for a short to ground, or for a high resistance.
  4. 26:  DTCs will set in the PCM when you perform this table.
Cruise Control Inoperative/Malfunctioning

Step Action Yes No
Schematic Reference: Cruise Control Schematics 
Connector End View Reference: Cruise Control Connector End Views , or Powertrain Control Module (PCM) Connector End Views in Engine Controls-5.7L, or Throttle Actuator Control (TAC) Module Connector End Views in Engine Controls-5.7L
1 Did you perform the Cruise Control Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Cruise Control 
2
  1. Install a scan tool.
  2. Turn the ignition ON, with the engine OFF.
  3. Turn the cruise control On/Off switch OFF.
  4. With the scan tool, observe the Cruise On/Off Switch parameter in the powertrain control module (PCM) Cruise Control Data data list.
Does the Cruise On/Off Switch parameter display Off?		 Go to Step 4  Go to Step 3 
3
  1. Turn the ignition OFF.
  2. Disconnect the cruise control switch.
  3. Turn the ignition ON, with the engine OFF.
  4. With the scan tool, observe the Cruise On/Off Switch parameter.
Does the Cruise On/Off Switch parameter display Off?		 Go to Step 20  Go to Step 11 
4
  1. Turn the cruise control On/Off switch ON.
  2. With the scan tool, observe the Cruise On/Off Switch parameter.
Does the Cruise On/Off Switch parameter display On?		 Go to Step 5  Go to Step 9 
5
  1. With the scan tool, observe the Cruise Set/Coast Switch parameter in the PCM Cruise Control Data data list.
  2. Turn the cruise control On/Off switch On.
  3. Press and hold the cruise control Set/Coast button.
Does the Cruise Set/Coast Switch parameter Display On?		 Go to Step 6  Go to Step 7 
6
  1. With the scan tool, observe the Cruise Resume/Accel. Switch parameter in the PCM Cruise Control Data data list.
  2. Press and hold the Resume/Accel switch.
Does the Cruise Resume/Accel. Switch parameter Display On?		 Go to Diagnostic Aids Go to Step 8 
7 
  1. Turn the ignition OFF.
  2. Disconnect the cruise control switch.
  3. Turn the ignition ON, with the engine OFF.
  4. Connect a 3 ampere fused jumper between the cruise control set/coast switch signal circuit and the ignition 1 voltage circuit.
  5. With the scan tool, observe the Cruise Set/Coast Switch parameter.
Does the Cruise Set/Coast Switch parameter Display On?		 Go to Step 20  Go to Step 17 
8 
  1. Turn the ignition OFF.
  2. Disconnect the cruise control switch.
  3. Turn the ignition ON, with the engine OFF.
  4. Connect a 3 ampere fused jumper between the cruise control resume/accel switch signal circuit and the ignition 3 voltage circuit.
  5. With the scan tool, observe the Cruise Resume/Accel. Switch parameter.
Does the Cruise Resume/Accel. Switch parameter Display On?		 Go to Step 20  Go to Step 18 
9 
  1. Turn the ignition OFF.
  2. Disconnect the cruise control switch.
  3. Turn the ignition ON, with the engine OFF.
  4. Connect a test lamp between the ignition 1 voltage circuit and a good ground.
Does the test lamp illuminate?		 Go to Step 10  Go to Step 13 
10
  1. Connect a 3 ampere fused jumper between the ignition 1 voltage circuit and the cruise control on switch signal circuit.
  2. With the scan tool, observe the Cruise On/Off Switch parameter.
Does the Cruise On/Off Switch parameter display On?		 Go to Step 20  Go to Step 16 
11 Test the cruise control on switch signal circuit for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 26  Go to Step 12 
12
  1. Turn the ignition OFF.
  2. Disconnect C1 of the TAC module.
  3. Turn the ignition ON, with the engine OFF.
  4. With the scan tool, observe the Cruise On/Off Switch parameter.
Does the Cruise On/Off Switch parameter display On?		 Go to Step 22  Go to Step 21 
13 Test the cruise control set/coast switch signal circuit for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 26  Go to Step 14 
14 Test the cruise control resume/accel switch signal circuit for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 26  Go to Step 15 
15 Test the cruise control on switch signal circuit for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 26  Go to Step 19 
16 Test the cruise control on switch signal circuit for an open or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 26  Go to Step 21 
17 Test the cruise control set/coast switch signal circuit for an open or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 26  Go to Step 21 
18 Test the cruise control resume/accel switch signal circuit for an open or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 26  Go to Step 21 
19 Repair the open, the high resistance, or the short to ground in the Ignition 1 voltage circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 26  -
20 Inspect for poor connections at the harness connector of the cruise control switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 26  Go to Step 23 
21 Inspect for poor connections at the harness connector of the TAC module. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 26  Go to Step 24 
22 Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 26  Go to Step 25 
23 Replace the cruise control switch. Refer to Multifunction, Turn Signal Switch Replacement in Steering Wheel and Column.
Did you complete the replacement?		 Go to Step 26  -
24 Replace the TAC module. Refer to Throttle Actuator Control (TAC) Module Replacement in Engine Controls-5.7L.
Did you complete the replacement?		 Go to Step 26  -
25
IMPORTANT: Program the replacement PCM.
Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls-5.7L.Did you complete the replacement?		 Go to Step 26  -
26 
  1. Use the scan tool in order to clear the PCM DTCs.
  2. Operate the vehicle within the conditions for cruise control operation.
Does the cruise control system operate properly?		 System OK Go to Step 2 
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