• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
Ignition Voltage | 1 | P0564 | 1 | -- | P0564 |
Cruise Control ON/OFF Switch Signal | 1 | P0564 | 1 | P0567, P0568 | P0564 |
Cruise Control Resume/Accel. Switch Signal | 1 | P0567 | 1 | P0567 | -- |
Cruise Control Set/Coast Switch Signal | 1 | P0568 | 1 | P0568 | -- |
1. Cruise Control Malfunction |
The cruise control switch is an input to the engine control module (ECM). The ECM monitors the cruise control on/off, set/coast, and the resume/accelerate switch signal circuits in order to detect when a cruise control function switch has been activated. The ECM detects a predetermined voltage signal when a cruise control function switch is applied, with each switch having a different voltage value.
• | The ignition is ON. |
• | The cruise switch is ON. |
• | The ECM detects an invalid voltage signal on the cruise control switch signal circuit. |
• | The above condition is present for greater than 2 seconds. |
• | The ECM runs this diagnostic every 0.05 second. |
• | The malfunction indicator lamp (MIL) will not illuminate. |
• | The cruise control system is disabled. |
• | The condition responsible for setting the DTC no longer exists. |
• | A history DTC will clear after 40 malfunction-free ignition cycles have occurred. |
Cruise Control Description and Operation
Control Module References for scan tool information
Engine ON, while rotating the steering wheel to both steering stops, observe the scan tool Cruise Control Switch parameter while pressing each of the cruise control switches. The parameter should toggle between ON, OFF, Resume, Set, as the applicable switch is pressed.
⇒ | If less than the specified value, test the ignition voltage circuit for a short to ground or an open/high resistance. |
⇒ | If not the specified value, test the signal circuit terminal 1 for a short to voltage. If the circuit tests normal, replace the ECM. |
⇒ | If not the specified value, test the signal circuit terminal 1 for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If not the specified value, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the BCM. |
⇒ | If not the specified value, test the signal circuit terminal 3 for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
Important: The cruise control switch must be ON in order to properly measure the resistance of the - /SET, +/RES, switches.
⇒ | If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the cruise control switch. |
Function Switch | Minimum Resistance Value | Maximum Resistance Value |
---|---|---|
OFF | O.L. | O.L. |
ON | 7.9k Ohms | 8.6k Ohms |
SET - | 1.4k Ohms | 1.6k Ohms |
RES + | 4.3k Ohms | 4.5k Ohms |
Cancel | 0.0 Ohms | 0.5 Ohms |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |