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P2100

P2100-ELECTRONIC THROTTLE CONTROL MOTOR CIRCUIT






For a complete wiring diagram refer to: Electrical Diagrams

When Monitored
With the ignition on and the ETC Motor is not in Limp Home mode.

Set Condition
When the PCM detects an internal error or a short between the ETC Motor- and ETC Motor + circuits in the ETC Motor Driver. One trip fault. ETC light is flashing.

Possible Causes
- THROTTLE PLATE / BORE INSPECTION
- (K124) ETC POSITIVE CIRCUIT SHORTED TO BATTERY VOLTAGE
- (K126) ETC NEGATIVE CIRCUIT SHORTED TO BATTERY VOLTAGE
- (K124) ETC POSITIVE CIRCUIT SHORTED TO (K126) ETC NEGATIVE CIRCUIT
- (K124) ETC POSITIVE CIRCUIT OPEN
- (K124) ETC POSITIVE CIRCUIT SHORTED TO GROUND
- (K126) ETC NEGATIVE CIRCUIT OPEN
- (K126) ETC NEGATIVE CIRCUIT SHORTED TO GROUND LOW BATTERY VOLTAGE
- ETC MOTOR/THROTTLE BODY PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test
1. ACTIVE DTC





Ignition on, engine not running.

NOTE: If the P2100 is intermittent, it is possible that the controller is overheating in extreme hot temperatures, and this is considered a normal protection operation. No repair is necessary.

NOTE: Low battery voltage can also cause excessive current draw, in very hot and very cold ambient temperatures. Make sure the battery can pass a Load test before continuing.

With a scan tool, read DTCs.
Look closely at the temperatures at which this DTC set.

Is the DTC active at this time?
Yes >> Go To 2
No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
2. THROTTLE PLATE INSPECTION
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.

Were any signs of foreign material or scoring of the throttle plate or bore found?
Yes >> Remove the debris if possible or replace the Throttle Body Assembly Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
No >> Go To 3
3. (K124) ETC POSITIVE CIRCUIT SHORTED TO BATTERY VOLTAGE





Turn the ignition off.
Disconnect the Throttle Body harness connector. Disconnect the PCM harness connectors.
Ignition on, engine not running.
With a 12-volt test light connected to ground, probe the (K124) ETC Positive circuit at the appropriate terminal of the special tool #8815.

Does the test light illuminate brightly?
Yes >> Repair the short to battery voltage on the (K124) ETC Positive circuit.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
No >> Go To 4
4. (K126) ETC NEGATIVE CIRCUIT SHORTED TO BATTERY VOLTAGE





Using a 12-volt test light connected to ground, probe the (K126) ETC Negative circuit at the appropriate terminal of the special tool #8815.

Does the test light illuminate brightly?
Yes >> Repair the short to battery voltage in the (K126) ETC Negative circuit.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
No >> Go To 5
5. (K124) ETC POSITIVE CIRCUIT SHORTED TO THE (K126) ETC NEGATIVE CIRCUIT





Measure the resistance between the (K124) ETC Positive circuit and the (K126) ETC Negative circuit at the appropriate terminal of the special tool #8815.

Is the resistance below 100 ohms?
Yes >> Repair the short to between the (K124) ETC Positive circuit and the (K126) ETC Negative circuit.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
No >> Go To 6
6. (K124) ETC POSITIVE CIRCUIT OPEN





Turn the ignition off.
Measure the resistance of the (K124) ETC Positive circuit from the Throttle Body harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?
Yes >> Go To 7
No >> Repair the open in the (K124) ETC Positive circuit.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
7. (K124) ETC POSITIVE CIRCUIT SHORTED TO GROUND





Measure the resistance between ground and the (K124) ETC Positive circuit at the appropriate terminal of the special tool #8815.

Is the resistance below 100 ohms?
Yes >> Repair the short to ground in the (K124) ETC Positive circuit.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
No >> Go To 8
8. (K126) ETC NEGATIVE CIRCUIT OPEN





Measure the resistance of the (K126) ETC Negative circuit between the Throttle Body harness connector and the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?
Yes >> Go To 9
No >> Repair the open in the (K126) ETC Negative circuit.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
9. (K126) ETC NEGATIVE CIRCUIT SHORTED TO GROUND





Measure the resistance between ground and the (K126) ETC Negative circuit at the appropriate terminal of the special tool #8815.

Is the resistance below 100 ohms?
Yes >> Repair the short to ground in the (K126) ETC Negative circuit.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
No >> Go To 10
10. ETC MOTOR





Reconnect the Throttle Body harness connector.

NOTE: Take the following measurement using special tool #8815 to avoid possible damage to the Throttle Body harness connector.

Measure the resistance of the ETC Motor between the (K447) ETC Positive circuit and the (K448) ETC Negative circuit at the appropriate terminals of special tool #8815.

Is the resistance between 2.5 and 25 ohms at closed throttle?
Yes >> Go To 11
No >> Replace the Throttle Body Assembly. Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
11. 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 POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
No >> Replace and program the Powertrain Control Module per Service Information.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
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