Part 1 of 2

Chart C-17 (1 Of 2):

Cruise Control Circuit:

CIRCUIT DESCRIPTION:

Cruise Control (C/C) operation is one of the functions which is PCM controlled. The PCM receives input signals from the C/C engagement switches, the brake switch, the vehicle speed sensor, the TPS and the servo position sensor. The PCM processes these inputs and sends output signals to the servo to open or close its vent and vacuum solenoid valves to control vehicle speed.

DIAGNOSTIC AIDS:

An intermittent may be caused by a poor connection, rubbed through wire insulation, or a wire broken inside the insulation.

Check for:

^ Poor connection -inspect ECM harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection and damaged harness.

If one or more of the following trouble codes are stored, cruise may be disabled. Repair any codes before diagnosing the cruise control system.

16 System voltage high or low. [1]
21 TPS high. [1]
22 TPS low. [1]
24 VSS circuit. [1]
36 Transaxle shift problem.
38 TCC brake switch circuit problem.
61 Cruise vent solenoid circuit problem.
62 Cruise vacuum solenoid circuit problem.
65 Cruise S.P.S circuit problem.
67 Cruise switch problem.
68 Cruise system problem.

[1] = "Service Engine Soon" light is "ON" when this code is set.