CRUISE CONTROL SWITCH
Description
The cruise control switch assembly contains three internal discrete switches that open and close according to cruise control requests by the driver. The PCM receives inputs from these switches to control fuel delivery through the fuel driver module and solenoid.
Cruise Control Switch Circuit Operation
The cruise “ON/OFF,” set/coast, and resume/accel switches are inputs to the fuel control portion of the PCM (figure 5-53).
These inputs allows the PCM to control and hold a requested speed.
• “ON/OFF“status is conveyed through CKT 397
• resume/accel status is conveyed through CKT 83
• set/coast status is conveyed through CKT 84
DTC 71 — “Set/Coast Switch Fault”
DTC 71 sets when cruise control is “ON” and the PCM sees ignition voltage on CKT 84 for more than 20 seconds. DTC 71 could be caused by the set/coast switch being stuck in the engage position. As a failsafe, if DTC 71 sets, the PCM will disallow all cruise control inputs.
DTC 76 — “Resume/Accel Switch Fault”
DTC 76 sets when cruise control is “ON” and the PCM sees ignition voltage on CKT 83 for more than 20 seconds. A set/coast switch stuck in the engage position or an open in CKT 84 could be the cause of DTC 76. As with DTC 71, the PCM will ignore all cruise control inputs if DTC 76 sets.