P2118

P2118-ELECTRONIC THROTTLE CONTROL MOTOR CURRENT PERFORMANCE

- When Monitored:
Ignition on and ETC motor is not in the Limp Home Position.

- 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.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. DTC IS ACTIVE

NOTE: If this DTC sets intermittently, it is possible that the controller is overheating in extremely hot temperatures. This is considered a normal protection operation. No repair is necessary.

NOTE: Low battery voltage can cause excessive current draw in very hot and cold ambient temperatures. Make sure the battery can pass a load test before continuing. Review Freeze Frame information to determine the ambient temperature when the DTC set.

NOTE: If P2072 is also set, this indicates that the cold weather ice blockage routine has run. No repair action is necessary.

NOTE: Diagnose and repair any Throttle Position sensor, system voltage, or 5 volt supply DTCs before continuing with this test.

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

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 may result in possible serious or fatal injury.

2. With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

- Go to 2

No

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

2. THROTTLE PLATE INSPECTION
1. Turn the ignition off.
2. Remove the air cleaner assembly.
3. Check for any signs of a foreign material (ice or dirt) on the throttle plate or in the throttle bore that can cause the throttle plate to stick.
4. Attempt to manually open the throttle plate. Use an appropriate tool that will not damage or mar the throttle body.

Were any problems 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 the PCM Verification TestPCM Verification Test.

No

- Go to 3

3. (K124) ETC MOTOR (+) CIRCUIT SHORTED TO VOLTAGE

1. Turn the ignition off.
2. Disconnect the Throttle Body harness connector.
3. Disconnect the PCM harness connectors.
4. Turn the ignition on.
5. Measure the voltage of the (K124) ETC Motor (+) circuit.

Is there any voltage present?

Yes

- Repair the (K124) ETC Motor (+) circuit for a short to voltage.
- Perform the PCM Verification TestPCM Verification Test.

No

- Go to 4

4. (K126) ETC MOTOR (-) CIRCUIT SHORTED TO VOLTAGE

1. Measure the voltage of the (K126) ETC Motor (-) circuit.

Is there any voltage present?

Yes

- Repair the (K126) ETC Motor (-) circuit for a short to voltage.
- Perform the PCM Verification TestPCM Verification Test.

No

- Go to 5

5. (K124) ETC MOTOR (+) CIRCUIT SHORTED TO THE (K126) ETC MOTOR (-) CIRCUIT

1. Turn the ignition off.
2. Measure the resistance between the (K124) ETC Motor (+) circuit and the (K126) ETC Motor (-) circuit.

Is the resistance below 100 ohms?

Yes

- Repair the short to between the (K124) ETC Motor (+) circuit and the (K126) ETC Motor (-) circuit.
- Perform the PCM Verification TestPCM Verification Test.

No

- Go to 6

6. (K124) ETC MOTOR (+) CIRCUIT SHORTED TO GROUND

1. Measure the resistance between ground and the (K124) ETC Motor (+) circuit.

Is the resistance below 100 ohms?

Yes

- Repair the short to ground in the (K124) ETC Motor (+) circuit.
- Perform the PCM Verification TestPCM Verification Test.

No

- Go to 7

7. (K126) ETC MOTOR (-) CIRCUIT SHORTED TO GROUND

1. Measure the resistance between ground and the (K126) ETC Motor (-) circuit.

Is the resistance below 100 ohms?

Yes

- Repair the short to ground in the (K126) ETC Motor (-) circuit.
- Perform the PCM Verification TestPCM Verification Test.

No

- Go to 8

8. (K126) ETC MOTOR (-) CIRCUIT OPEN OR HIGH RESISTANCE

NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.

1. Measure the resistance of the (K124) ETC Motor (+) circuit.

Is the resistance below 5.0 ohms?

Yes

- Go to 10

No

- Repair the (K124) ETC Motor (+) circuit for an open circuit or high resistance.
- Perform the PCM Verification TestPCM Verification Test.

10. ETC MOTOR RESISTANCE
1. Reconnect the Throttle Body harness connector.

NOTE: Measure the resistance at the PCM harness connector to avoid damaging throttle body connector terminals.

NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.

2. Measure the resistance between the (K124) ETC Motor (+) circuit and the (K126) ETC Motor (-) circuit.

Is the resistance between 2.5 and 25 ohms at closed throttle?

Yes

- Go to 12

No

- Go to 11

11. THROTTLE BODY
1. Turn the ignition off.
2. Inspect the wiring and connectors between the Throttle Body and the Powertrain Control Module (PCM).
3. Look for any chafed, pierced, pinched, or partially broken wires.
4. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related connectors.

Were any problems found?

Yes

- Repair as necessary.
- Perform the PCM Verification TestPCM Verification Test.

No

- Replace the Throttle Body.
- Perform the PCM Verification TestPCM Verification Test.

12. POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Throttle Body and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Search for any Technical Service Bulletins that may apply.

Were any problems found?

Yes

- Repair as necessary.
- Perform the PCM Verification TestPCM Verification Test.

No

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