Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2002 Saturn Vue, 2002 Pontiac Montana, 2002 Pontiac Aztek, 2002 Oldsmobile Silhouette, and 2002 Oldsmobile Bravada. However, it is still accessible from the selected car via links, so may be relevant.
Inspect for the following conditions:
- A skewed high Throttle Position (TP) sensor.
- Restricted air intake system.
- Objects blocking the IAC passage or throttle bore.
- The correct Positive Crankcase Ventilation (PCV) valve.
- A properly installed PCV valve.
- Proper operation of the PCV valve.
- Proper operation and installation of all air intake components.
- Proper installation and operation of the Mass Air Flow (MAF) sensor, if equipped.
- Evidence of damage or tampering of the following components:
- The throttle stop screw.
- The throttle plate.
- The throttle shaft.
- The throttle linkage.
- The cruise control linkage, if equipped.
- Excess deposits in the IAC passage or on the IAC pintle.
- Excess deposits in the throttle bore or on the throttle plate Vacuum leaks.
- Excess load on engine, such as energy-draining conditions of the transmission, power steering, or alternator.
- A high or unstable idle condition. This condition could be caused by a non-IAC system problem that can not be overcome by the IAC valve. See TROUBLE SHOOTING - NO CODES - TRUCKS article.
- A low or unstable idle condition. This condition could be caused by a non-IAC system problem that can not be overcome by the IAC valve. See TROUBLE SHOOTING - NO CODES - TRUCKS article.
- An intermittent condition.
RPM VARIATION LIMITS
| Engine | Maximum RPM Less Than Commanded RPM | Maximum RPM More Than Commanded RPM |
|---|---|---|
| 2.2L (A/T) | 60 | 60 |
| 2.2L (M/T) | 100 | 60 |
| 3.4L | 100 | 150 |
| 4.3L, 4.8L, 5.0L, 5.3L, 5.7L & 6.0L | 100 | 200 |