1000 - 1999: 1316

1316-ELECTRONIC THROTTLE CONTROL SYSTEM - ICE BLOCKAGE / SIGNAL IMPLAUSIBLE





For a complete wiring diagram refer to Diagrams/Electrical.

- When Monitored:

Ignition on.

- Set Condition:

The PCM recognizes the Throttle plate is stuck during extremely cold Ambient Temperature operation. The throttle plate goes through a de-icing procedure. If the throttle blade still doesn't move this fault sets. The MIL will not illuminate. ETC light will illuminate. The vehicle will be in Limp home condition, limiting rpm and vehicle speed.





Diagnostic Test

1. THROTTLE BODY INSPECTION

Ignition on, engine not running.

With a scan tool, read DTCs and record the related Freeze Frame data.

NOTE: This DTC sets in extreme cold Ambient Temperatures with the throttle plate stuck by the time the vehicle gets to the dealership the condition may be corrected.

NOTE: Diagnose any other DTCs that may also be set before continuing.

Turn the ignition off.

Remove the Air Cleaner Assembly from the Throttle Body.

Check for any signs of a foreign material (ice or dirt) on the Throttle Plate or in the bore causing the Throttle Plate to stick.

Is the throttle blade still stuck because it is frozen?

Yes

- Allow the Throttle Body to thaw naturally in a room temperature climate.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Go To 2

2. EXCESSIVE RESISTANCE IN THE ETC MOTOR (+) CIRCUIT

Turn the ignition off.

Using a voltmeter perform a voltage drop test. Backprobe the ETC Motor (+) circuit at the Throttle Body harness connector and the appropriate ECM harness connector. Make sure the voltmeter leads are connected so a Motor (+) polarity is displayed on the voltmeter.

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.

Start the engine and allow it to reach normal operating temperature.

Monitor the voltmeter.

Is the voltage below 0.5 of a volt?

Yes

- Go To 3

No

- Repair the excessive resistance in the ETC Motor (+) circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

3. EXCESSIVE RESISTANCE IN THE ETC MOTOR (-) CIRCUIT

Turn the ignition off.

Move the voltmeter leads to backprobe the ETC Motor (-) circuit at the Throttle Body harness connector and appropriate ECM harness connector. Make sure the voltmeter leads are connected so a Motor (+) polarity is displayed on the voltmeter.

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.

Start the engine and allow it to reach normal operating temperature.

Monitor the voltmeter.

Is the voltage below 0.5 of a volt?

Yes

- Test Complete. The conditions that originally set this DTC are not present at this time.
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. Checking for an Intermittent DTC

No

- Repair the excessive resistance in the ETC Motor (-) circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test