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Diagnostic Trouble Code (DTC) P1631

Immobilizer Enable Signal Not Correct

Circuit Description

The Engine Control Module (ECM) is the control center of the fuel injection system. It constantly looks at the information from various sensors, and controls the systems that affect vehicle performance. The ECM also performs the diagnostic function of the system. It can recognize operational problems, alert the driver through the Service Vehicle Soon (SVS) Lamp, and store a Diagnostic Trouble Code (DTC) or DTCs which identify the problem areas to aid the technician in making repairs. The ECM received incorrect message identification.

Conditions for Running the DTC

Conditions for Setting the DTC

Action Taken When the DTC Sets

Conditions for Clearing the MIL/DTC

DTC P1631 - Immobilizer Enable Signal Not Correct

Step Action Value(s) Yes No
1
Perform the Diagnostic System Check.
Is the system check complete?
-
Go to Step 2
Go to "Diagnostic System Check"
2
  1. Turn the ignition switch to LOCK.
  2. Install a scan tool to the data link connector (DLC).
  3. Turn the ignition switch to ON.
  4. Check if other immobilizer related DTCs are set.
Are any DTCs displayed?
-
Go to Applicable DTC table
Go to Step 3
3
Perform the Programming Theft Deterrent System Components. Refer to Section 9T2, Immobilizer Anti-Theft System
-
Go to Step 5
Go to Step 4
4
Replace the ECM.
Is the replace complete?
-
Go to Step 5
-
5
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Setting the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?
-
Go to Step 2
Go to Step 6
6
Check if any additional DTCs are set.
Are any DTCs displayed that have not been diagnosed?
-
Go to applicable DTC table
System OK

Diagnostic Trouble Code (DTC) P1682

Ignition 1 Switch Circuit 2

Circuit Description

The electronic throttle control (ETC) system uses an ignition voltage supply separate from the engine control module (ECM) supply. If the ECM detects a voltage difference between the two circuits, this diagnostic trouble code (DTC) will set.

Conditions for Running the DTC

Conditions for Setting the DTC

Action Taken When the DTC Sets

Conditions for Clearing the MIL/DTC

DTC P1682 - Ignition 1 Switch Circuit 2

Step Action Value(s) Yes No
1
Did you perform the Diagnostic System Check?
-
Go to Step 2
Go to "Diagnostic System Check"
2
  1. Observe the Freeze Frame/Failure Records data for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Turn ON the ignition, with the engine OFF for 10 seconds.
Does the DTC fail this ignition?
-
Go to Step 3
Go to "Intermittent"
3
With a test lamp connected to ground, probe both sides of the ETC fuse.
Does the test lamp illuminate on both sides of the fuse?
-
Go to Step 5
Go to Step 4
4
Does the test lamp illuminate on one side of the fuse?
-
Go to Step 6
Go to "Main Relay Circuit Check"
5
  1. Turn OFF the ignition.
  2. Disconnect the engine control module (ECM).
  3. Test both electronic throttle control (ETC) ignition circuits for an open or for a high resistance.
Did you find and correct the condition?
-
Go to Step 9
Go to Step 7
6
  1. Turn OFF the ignition.
  2. Disconnect the ECM.
  3. Test both ETC ignition circuits for a short to ground.
  4. Replace the fuse if necessary.
Did you find and correct the condition?
-
Go to Step 9
Go to Step 7
7
Test for an intermittent and for a poor connection at the ECM.
Did you find and correct the condition?
-
Go to Step 9
Go to Step 8
8
Replace the ECM.
Did you complete the replacement?
-
Go to Step 9
-
9
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Does the DTC fail this ignition?
-
Go to Step 2
Go to Step 10
10
Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?
-
Go to applicable DTC table
System OK

Diagnostic Trouble Code (DTC) P1845

Torque Limit Management

Circuit Description

The ECM monitors and compares the engine torque output against the maximum allowable engine torque.
If the requested torque is higher than the maximum allowable torque, the ECM applies engine torque limitation and DTC P1845.

Conditions for Running the DTC

Conditions for Setting the DTC

Action Taken When the DTC Sets

Conditions for Clearing the MIL/DTC

DTC P1845 - Torque Limit Management

Step Action Value(s) Yes No
1
Did you perform the Diagnostic System Check?
-
Go to Step 2
Go to "Diagnostic System Check"
2
  1. Switch off the ignition for 30 seconds.
  2. Operate the vehicle within the conditions for running the DTC.
  3. Using the Scan Tool, select the DTC display function.
Did the DTC P1845 fail this ignition?
-
Go to Step 3
-
3
Are there any other ECM or TCM DTCs set?
-
Go to appropriate DTC table.
Go to Step 4
4
Inspect for fault conditions in the engine or transmission that applies excessive load on the engine.
Did you find and correct the condition?
-
Go to Step 6
Go to Step 5
5
Replace the ECM.
Did you complete the replacement?
-
Go to Step 6
-
6
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Setting the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?
-
Go to Step 2
Go to Step 7
7
Check if any additional DTCs are set.
Are there any DTCs that have not been diagnosed?
-
Go to applicable DTC table
System OK


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