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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 180 (Cruise Control System) >> Diagnostic Information and Procedures >> DTC P0608 >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

For intermittent diagnosis, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

DTC P0608

Step Action Value(s) Yes No
Schematic Reference: Cruise Control 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. Turn OFF the ignition.
  2. Install a scan tool.
  3. Raise the vehicle drive wheels. Refer to Lifting and Jacking the Vehicle in General Information.
  4. Start the engine.
  5. Place the transmission into drive.
  6. With a scan tool, observe the Vehicle Speed Sensor parameter in the Body and Accessories, Cruise Control data list.
Does the Vehicle Speed Sensor parameter indicate any vehicle speed?		 - Go to Step 4  Go to Step 3 
3 Is DTC P0502 or P0503 current in the powertrain control module (PCM)? - Go to DTC P0502 (3.5L) or DTC P0503 (3.5L) in Automatic Transaxle - 4T65-E Go to Step 7 
4
  1. Turn OFF the ignition.
  2. Disconnect the throttle actuator control (TAC) module.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage from the vehicle speed signal circuit to a good ground.
Does the voltage measure greater than the specified value?		 8.5 V Go to Step 5  Go to Step 6 
5 Test the vehicle speed signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 8 
6 Test the vehicle speed signal circuit for an open or for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 7 
7 Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections andConnector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 9 
8 Inspect for poor connections at the harness connector of the TAC 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 11  Go to Step 10 
9 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 11  -
10 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 11  -
11
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC.
Does the DTC reset?		 - Go to Step 2  System OK
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