DTC Troubleshooting

Control System DTCs

DTC Troubleshooting: P2118

DTC P2118 : Throttle Actuator Current Range/Performance Problem

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information How To Troubleshoot The Fuel And Emissions Systems.

1. Problem verification:

Problem verification
-1. Turn the ignition switch to ON (II).

-2. Clear the DTC with the HDS.

-3. Slowly press the accelerator pedal to the floor.

-4. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P2118 indicated?
-YES- The failure is duplicated. Go to step 2.
-NO- Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the ECM, then clean the throttle body Throttle Body Cleaning.

2. Open wire check (SG3 line):

Open wire check (SG3 line)
-1. Turn the ignition switch to LOCK (0).

-2. Jump the SCS line with the HDS.

-3. Disconnect the following connectors.





-4. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- The SG3 wire is OK. Go to step 3.
-NO- Repair an open in the SG3 wire between the ECM (C14) and the throttle body, then do the repair verification.

3. Shorted wire check (MTR1 line to MTR2 line):

Shorted wire check (MTR1 line to MTR2 line)
-1. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- Repair a short in the MTR1 and MTR2 wires between the throttle body and the ECM (C3, C4), then do the repair verification.
-NO- Go to step 4.

4. Shorted wire check (MTR1, MTR2 line to ground):

Shorted wire check (MTR1, MTR2 line to ground):
-1. Check for continuity between test points 1 and 2.














Is there continuity?
-YES- Repair a short to ground in the MTR1, MTR2 wire between the throttle body and the ECM (C3, C4), then do the repair verification.
-NO- The MTR1, MIR2 wires are OK. Go to step 5.

5. Throttle body internal circuit check (short in wires):

Throttle body internal circuit check (short in wires)
-1. At the throttle body side, measure the resistance between test points 1 and 2.









Is there about 1.2-1.0 kOhms?
-YES- Go to step 6
-NO- Replace the throttle body Removal and Replacement, then do the repair verification.

6. Throttle body internal circuit check (short to ground):

Throttle body internal circuit check (short to ground)
-1. At the throttle body side, measure the resistance between test points 1 and 2.














Is there continuity?
-YES- Replace the throttle body Removal and Replacement, then do the repair verification.
-NO- The throttle body internal circuit is OK. Update the ECM ECM/PCM Update if it does not have the latest software, or substitute a known-good ECM Service and Repair, then do the repair verification.

Repair verification:

-1. Turn the ignition switch to LOCK (0).

-2. Reconnect all connectors.

-3. Turn the ignition switch to ON (II).

-4. Reset the ECM with the HDS How To Troubleshoot The Fuel And Emissions Systems.

-5. Do the ECM idle learn procedure ECM/PCM Idle Learn Procedure.

-6. Slowly press the accelerator pedal to the floor.

-7. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P2118 indicated?
-YES- Check for poor connections or loose terminals at the throttle body and the ECM. If the ECM was updated, substitute a known-good ECM Service and Repair, then recheck. If the ECM was substituted, go to step 1.
-NO- Troubleshooting is complete. If the ECM was substituted, replace the original ECM Service and Repair. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.