2000 - 2999: 2186

2186-IDLE SPEED PERFORMANCE LOWER THAN EXCEPTED

For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
With the engine running at idle.

- Set Condition:
Engine speed is 100 RPM or more below idle speed for 7 seconds.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.

Diagnostic Test

1. ACTIVE DTC
NOTE: If any other Throttle Body DTCs are present, they must be diagnosed and repaired before continuing this test.

Start the engine.
Allow the engine to reach normal operating temperature.
With a scan tool, select View DTCs.

NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data.

Is the DTC Active or Pending at this time?

Yes

- Go To 2

No

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.Checking for an Intermittent DTC.

2. AIR INDUCTION SYSTEM
Inspect the Air Induction System for the following problems.
Restrictions: Dirty Air Cleaner, Foreign material trapped in the air intake tube, etc.
Leaks: Air Intake tube connection, Air Cleaner housing, etc.
Were any problems found?

Yes

- Repair or replace as necessary.
- Perform the Powertrain Verification Test. Powertrain Verification Test.

No

- Go To 3

3. PCV SYSTEM
Inspect the PCV system for the following problems:
Restrictions - sticking valve, collapsed hoses or tubes, obstructed passages or ports, etc.
Leaks - cracked or damaged hoses or tubes, poor hose or tube connections, PCV valve stuck open, etc.
Were any problems found?

Yes

- Repair as necessary.
- Perform the Powertrain Verification Test. Powertrain Verification Test.

No

- Go To 4

4. THROTTLE BODY OPERATION
Inspect the throttle body for carbon build up, other restrictions, and a bent throttle plate using a straight edge.
If the throttle plate does not close entirely it may be bent and needs to be replaced.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

While the vehicle is running, lightly tap on ETC Motor with your hand, and listen for idle to raise.
Were any problems found or did the idle fluctuate while tapping on the ETC Motor?

Yes

- Repair or replace as necessary.
- Perform the Powertrain Verification Test. Powertrain Verification Test.

No

- Go To 5

5. PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.
Were there any problems found?

Yes

- Repair as necessary.
- Perform the Powertrain Verification Test. Powertrain Verification Test.

No

- Replace and program the Powertrain Control Module.
- Perform the Powertrain Verification Test. Powertrain Verification Test.