Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2002 Saturn SL2, 2002 Saturn SL1, 2002 Saturn SL, 2002 Saturn SC2, and 2002 Saturn SC1. However, it is still accessible from the selected car via links, so may be relevant.
Inspect for the following conditions:
- Skewed high TP sensor.
- Restricted air intake system.
- Objects blocking IAC passage or throttle bore.
- Correct Positive Crankcase Ventilation (PCV) valve, properly installed and proper operation of PCV valve (if equipped).
- Proper operation and installation of all air intake components.
- Proper installation and operation of Mass Air Flow (MAF) sensor (if equipped).
- Tampered with or damaged throttle stop screw.
- Tampered with or damaged throttle plate, throttle shaft, throttle linkage, or cruise control linkage (if equipped).
- Excessive deposits in IAC passage or on IAC pintle.
- Excessive deposits in throttle bore or on throttle plate.
- Vacuum leaks
- Excessive engine load caused by faulty transmission, power steering, alternator, etc.
- High or unstable idle condition caused by a non-IAC system problem that can not be overcome by IAC valve.
- Low or unstable idle condition caused by a non-IAC system problem that can not be overcome by IAC valve.
RPM VARIATION LIMITS
| Engine | Maximum RPM Less Than Commanded RPM | Maximum RPM More Than Commanded RPM |
|---|---|---|
| 2.2L & 2.4L (M/T) | 60 | 100 |
| 2.2L & 2.4L (A/T) | 60 | 60 |
| 3.1L & 3.4L | 100 | 150 |
| 3.5L | 75 | 75 |
| 3.8L | 100 | 175 |
| 4.0L & 4.6L | 100 | 100 |