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Home >> Pontiac >> 2009 >> Torrent Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 13 (Cruise Control System) >> Diagnostic Information and Procedures >> Cruise Control Inoperative/Malfunctioning >> Test Description
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Test Description

WARNING: This page is about a different car, the 2006 Pontiac Torrent and 2006 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic path.

  1. 6:  This step tests the vehicle speed signal circuit for a short to ground, for a short to voltage, for an open, or for a high resistance between the PCM and the TAC module.
  2. 8:  This step tests the ignition 1 voltage circuit for a short to ground, for an open, or for a high resistance.
  3. 9:  This step tests the cruise control set/coast and resume/accelerate switch signal circuit for a short to voltage.
  4. 10:  This step tests the cruise control set/coast and resume/accelerate switch signal circuit for a short to ground, for a short to voltage, for an open, or for a high resistance.
  5. 26:  DTCs will set in the powertrain control module (PCM) when you perform this diagnostic table.
Cruise Control Inoperative/Malfunctioning

Step Action Values Yes No
Schematic Reference: Cruise Control Schematics (Chevrolet)  or Cruise Control Schematics (Pontiac)  or Engine Controls Schematics
Connector End View Reference: Master Electrical Component List in Wiring Systems
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Turn the cruise control On/Off switch OFF.
  4. With the scan tool, observe the following Cruise Control parameters in the Cruise Control data list:
    • Cruise On/Off Switch
    • Cruise Resume/Accel. Switch
    • Cruise Set/Coast Switch
Do any of the parameters listed above display On?		 - Go to Step 9  Go to Step 3 
3
  1. With the scan tool, observe the Cruise On/Off Switch parameter.
  2. Turn the cruise control On/Off switch ON.
Does the Cruise On/Off Switch parameter display On?		 - Go to Step 4  Go to Step 8 
4
  1. With the scan tool, observe the Cruise Set/Coast Switch parameter.
  2. Press and hold the set/coast switch.
Does the Cruise Set/Coast Switch parameter display On?		 - Go to Step 5  Go to Step 10 
5
  1. With the scan tool, observe the Cruise Resume/Accel. Switch parameter.
  2. Press and hold the resume/accel switch.
Does the Cruise Resume/Accel. Switch parameter display On?		 - Go to Step 6  Go to Step 10 
6 
  1. Turn OFF the ignition.
  2. Disconnect the throttle actuator control (TAC) module.
  3. Turn ON the ignition, with the engine OFF.
  4. With a DMM, measure the voltage of the vehicle speed signal circuit.
Does the voltage measure greater than the specified value?		 8.5 V Go to Step 7  Go to Step 11 
7 Test the vehicle speed 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 21 
8 
  1. Turn OFF the ignition.
  2. Remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement in SIR.
  3. Disconnect C277.
  4. Turn ON the ignition, with the engine OFF.
  5. 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 22 
9 
IMPORTANT: The cruise control On/Off switch must be turned ON in order to correctly view the set/coast switch and the resume/accel switch resistance values with the DMM.
  1. Turn OFF the ignition.
  2. Remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement in SIR.
  3. Disconnect C277.
  4. With a DMM, measure the resistance of the cruise control switch between the ignition 1 voltage circuit and the cruise control set/coast and resume/accelerate switch signal circuit.
  5. Individually activate and hold the cruise control function switches while measuring the resistance of the cruise control function switches.
Do the cruise control function switch resistance values measure between the specified values?		 Off = O.L.
On = 7.8 K-8.6 K Ω
Resume = 2.7 K-3.0 K Ω
Set = 1.2 K- 1.3 K Ω		 Go to Step 12  Go to Step 17 
10 
IMPORTANT: The cruise control On/Off switch must be turned ON in order to correctly view the set/coast switch and the resume/accel switch resistance values with the DMM.
  1. Turn OFF the ignition.
  2. Remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement in SIR.
  3. Disconnect C277.
  4. With a DMM, measure the resistance of the cruise control switch between the ignition 1 voltage circuit and the cruise control set/coast and resume/accelerate switch signal circuit.
  5. Individually activate and hold the cruise control function switches while measuring the resistance of the cruise control function switches.
Do the cruise control function switch resistance values measure between the specified values?		 Off = O.L.
On = 7.8 K-8.6 K Ω
Resume = 2.7 K-3.0 K Ω
Set = 1.2 K- 1.3 K Ω		 Go to Step 13  Go to Step 14 
11 Test the vehicle speed 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 20 
12 Test the cruise control set/coast and resume/accel switch signal circuit for a short to voltage between C277 and the powertrain control module (PCM). 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 20 
13 Test the cruise control set/coast and resume/accel switch signal circuit for the following:
  • Open
  • Short to ground
  • Short to voltage
  • 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 20 
14 Test the ignition 1 voltage circuit between C277 and the cruise control switch for the following:
  • Open
  • Short to ground
  • 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 15 
15 Test the cruise control on switch signal circuit for the following:
  • Open
  • Short to ground
  • Short to voltage
  • 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 16 
16 Test the cruise control set/coast and resume/accelerate switch signal circuit between C277 and the cruise control switch for the following:
  • Open
  • Short to ground
  • Short to voltage
  • 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 19 
17 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 18 
18 Test the cruise control set/coast and resume/accelerate switch signal circuit between C277 and the cruise control switch 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 19 
19 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 
20 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 
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 Repair the following in the ignition 1 voltage circuit:
  • Open
  • Short to ground
  • High resistance

Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 26  -
23 Replace the cruise control switch. Refer to Cruise Control Switch Replacement .
Did you complete the replacement?		 - Go to Step 26  -
24 Replace the TAC module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 26  -
25 Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 26  -
26 
  1. Install the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement in SIR.
  2. Enable the inflatable restraint steering wheel module. Refer to SIR Disabling and Enabling Zone 3 in SIR.
  3. Use the scan tool in order to clear the PCM DTCs.
  4. Operate the Cruise Control System in order to verify the repair.
Does the Cruise Control System operate properly?		 - System OK Go to Step 2 
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