Idle speed is maintained by the Powertrain Control Module (PCM). No adjustment is necessary or possible.Inspection
Curb Idle Speed
This procedure requires the following special tools, or their equivalents:
Before inspection, the vehicle must be in the following condition:
- Engine coolant temperature: 80 - 95°C (176 - 203°F)
- Lights, and all accessories: OFF
Transaxle: P range
NOTEOn Canadian vehicles, the headlight, taillight, etc. remain lit even when the light switch is in the "OFF" position but this is not a problem for checks.
WARNINGTo prevent damage to the scan tool, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
Connect the scan tool (MB991958 or equivalent) to the data link connector.
- Check the base ignition timing. It should be 5° BTDC (Before Top Dead Center).
- Start the engine.
- Run the engine at idle for 2 minutes.
Check the idle speed. Select item number 22 and take a reading of the idle speed. The curb idle speed should be 580-780 rpm.
NOTEThe idle speed is controlled automatically by the idle air control system.