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Home >> Suzuki >> 2006 >> Verona Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTC P0461 Through U0121 >> DTC P0638: Throttle Actuator Control (TAC) Command Performance >> DTC Troubleshooting

DTC Troubleshooting

DTC TROUBLESHOOTING CHART

Step Action Value (s) Yes No
1 Did you perform the DIAGNOSTIC SYSTEM CHECK ? - Go to Step 2. Go to ON-BOARD DIAGNOSTIC (OBD II) SYSTEM CHECK .
2
  1. Turn the ignition ON, with the engine OFF.
  2. Clear the DTCs with a scan tool.
  3. Start the engine.
  4. Perform the following tests:
    • Rapidly depress the accelerator pedal from the rest position to the Wide Open Throttle (WOT) position and release pedal. Repeat the procedure several times.
    • Slowly depress the accelerator pedal to WOT and then slowly return the pedal to closed throttle. Repeat the procedure several times.
  5. Observe the DTC information with a scan tool.

Did DTC P0121, P0122, P0123, P0221, P0222 or P0223 fail this ignition?		 - Go to applicable DTC Table . Go to Step 3.
3 Did DTC P0638 and/or P2119 fail this ignition? - Go to Step 5. Go to Step 4.
4
  1. Observe the Freeze Frame / Failure Records for this DTC.
  2. Turn the ignition OFF 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 5. Go to Diagnostic Aids .
5
  1. Turn the engine OFF.
  2. Turn the ignition ON, with the engine OFF.
  3. Observe the TP sensor 1 voltage parameter with a scan tool.

Is the voltage within the specified range?		 0.40 - 0.80 V Go to Step 6. Go to DTC P0121: Throttle Position (TP) Sensor 1 Performance .
6 Observe the TP sensor 2 voltage parameter with a scan tool.
Is the voltage within the specified range?		 4.7 - 4.1 V Go to Step 7. Go to DTC P0221: Throttle Position (TP) Sensor 2 Performance .
7
  1. Disconnect the throttle body harness connector.
  2. Turn the ignition ON, with the engine OFF.
  3. Measure the voltage of the throttle actuator control (TAC) motor control 1 and TAC motor control 2 circuits of the throttle actuator control motor with a DMM connected to the Engine Control Module (ECM) housing.

Is the voltage within the specified range for both circuits?		 2 - 4 V Go to Step 8. Go to Step 9.
8
  1. Turn the ignition OFF.
  2. With a Test Lamp connected to ground, prove the TAC motor control 1 and TAC motor control 2 circuit of the throttle body harness connector.
  3. Turn the ignition ON for about 5 seconds and then turn the ignition OFF while you observe the test lamp. Repeat this procedure, as necessary.

Does the test lamp turn ON and then OFF each time the ignition is cycled?		 - Go to Step 12. Go to Step 11.
9 Is the voltage less than the specified value? 2 V Go to Step 10. Go to Step 14.
10 Test the TAC motor control circuit that measured below the specified value for an open or a short to ground.
Did you find and correct the condition?		 - Go to Step 18. Go to Step 13.
11
  1. Turn the ignition OFF.
  2. Disconnect the ECM.
  3. Test for continuity between the TAC motor control 1 and TAC motor control 2 circuit of the throttle body harness connector.

Is there continuity?		 - Go to Step 15. Go to Step 13.
12 Test for shorted terminals and for poor connections at the throttle body connector.
Did you find and correct the condition?		 - Go to Step 18. Go to Step 16.
13 Test for shorted terminals and for poor connections at the ECM.
Did you find and correct the condition?		 - Go to Step 18. Go to Step 17.
14 Repair the appropriate TAC motor control circuit for a short to voltage.
Did you complete the repair?		 - Go to Step 18. -
15 Repair the short between the TAC motor control circuits 1 and 2.
Did you complete the repair?		 - Go to Step 18. -
16 Replace the throttle body assembly.
Did you complete the replacement?		 - Go to Step 18. -
17 Replace the ECM.
Did you complete the replacement?		 - Go to Step 18. -
18
  1. Clear the DTCs with a scan tool.
  2. Turn the ignition OFF 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 19.
19 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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