Cruise Control - Inoperative/Malfunctioning Update
Bulletin No.: 04-08-68-001Date: February 26, 2004
SERVICE MANUAL UPDATE
Subject:
Service Manual Update Regarding the Cruise Control Inoperative/Malfunctioning Diagnostic Table
Models:
2003-2004 Saturn ION
with 2.2L Engine (VIN F - RPO L61)
Attention:
Technician
Purpose
The Cruise Control Inoperative/Malfunction diagnostic table in the Cruise Control section of the 2003 and 2004 Saturn ION Service Manuals should be replaced with the Cruise Control Inoperative/Malfunction diagnostic table shown.
The new table uses resistance values instead of voltage readings or a test lamp when checking the proper operation of the cruise control function switches.
The SI website will be updated immediately and future Service Stall System SI CD releases will include this and other Service Manual updates.
Diagnostic Aids
Caution:
Refer to SIR Caution in Cautions and Notices.
Important:
Perform the following in order to avoid misdiagnosis.
1. Inspect for proper operation of brake lamps.
2. Inspect throttle linkage for mechanical binding which could cause the system to malfunction.
3. Inspect cruise control cable adjustment, should have minimum slack.
4. When testing vehicles equipped with steering wheel controls, the steering wheel must be rotated to each stop position while testing the cruise control switch signal circuits. This will ensure the integrity of the SIR coil.
Disable the inflatable restraint steering wheel module when performing this diagnostic table. Refer to SIR Disabling and Enabling Zone 3 in SIR in the appropriate service manual.
^ Ensure that the following cruise control switches are not stuck in the engaged position:
^ On/off switch
^ Set/coast switch
^ Resume/accel switch
^ With a scan tool, observe the associated cruise control switch parameter in the ECM Cruise Control Data list, while rotating the steering wheel to both steering stops and separately activating each cruise control switch. This will help eliminate the possibility of an internally shorted inflatable restraint steering wheel module coil.
^ EMI on the speed sensor signal circuit may cause erratic cruise control operation.
^ For an intermittent condition, refer to "Testing for Intermittent and Poor Connections" in Wiring Systems.
Conditions for Enabling Cruise Control
^ When vehicle speed is more than 40 km/h (25 mph)
^ When PARK, REVERSE, NEUTRAL, or 1st gear is not indicated
^ When an over/undercharged battery condition does not exist
^ With normal engine RPM
^ Without high engine RPM fuel cut-off
Disclaimer