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Home >> Suzuki >> 2006 >> Verona Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTC P0030 Through P0175 >> DTC P0121: Throttle Position (TP) Sensor 1 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. Start the engine.
  2. Perform the following tests:
    1. Rapidly depress the accelerator pedal from the rest position to the Wide Open Throttle (WOT) position and release pedal. Repeat the procedure several times.
    2. Slowly depress the accelerator pedal to WOT and then slowly return the pedal to closed throttle. Repeat the procedure several times.
  3. Observe the TP Sensor 1 and 2 parameter with a scan tool.

Does the scan tool display Agree?		 - Go to Step 3. Go to Step 5.
3
  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 - 0.8 V Go to Step 4. Go to Step 5.
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 ignition OFF.
  2. Disconnect the throttle body harness connector.
  3. Turn the ignition ON, with the engine OFF.
  4. Connect a test lamp between the 5 volt reference circuit of the Throttle Position (TP) sensor and the Engine Control Module (ECM) housing.
  5. Connect a DMM to the probe of the test lamp and the ECM housing.

Is the voltage more than the specified value?		 4.8 V Go to Step 6. Go to Step 11.
6
  1. Connect a 3 A fused jumper wire between the 5 volt reference circuit of the TP sensor and the signal 1 circuit of the TP sensor.
  2. Observe the TP sensor 1 voltage parameter, with a scan tool.

Is the voltage more than the specified value?		 4.8 V Go to Step 7. Go to Step 9.
7
  1. Connect a 3 A fused jumper wire between the 5 volt reference circuit of the TP sensor and the signal 2 circuit of the TP sensor.
  2. Observe the TP sensor 2 voltage parameter with a scan tool.

Is the voltage more than the specified value?		 4.8 V Go to Step 8. Go to Step 10.
8
  1. Turn the ignition OFF.
  2. Remove the ECM/TCM fuse from the engine fuse block.
  3. Measure the resistance from the low reference circuit of the TP sensor to the ECM housing, with a DMM.

Is the resistance less than the specified value?		 5 Ω Go to Step 13. Go to Step 12.
9 Test the signal 1 circuit of TP sensor for a high resistance, or an open.
Did you find and correct the condition?		 - Go to Step 17. Go to Step 14.
10 Test the signal 2 circuit of TP sensor for a high resistance, or an open.
Did you find and correct the condition?		 - Go to Step 17. Go to Step 14.
11 Test the 5 volt reference circuit of the TP sensor and all shared 5 volt reference circuits for a high resistance or an open.
Did you find and correct the condition?		 - Go to Step 17. Go to Step 14.
12 Test the low reference circuit of the TP sensor for a high resistance or an open.
Did you find and correct the condition?		 - Go to Step 17. Go to Step 14.
13 Test for shorted terminals and for poor connections at the throttle body.
Did you find and correct the condition?		 - Go to Step 17. Go to Step 15.
14 Test for shorted terminals and for poor connections at the throttle body and at the ECM.
Did you find and correct the condition?		 - Go to Step 17. Go to Step 16.
15 Replace the throttle body assembly.
Did you complete the replacement?		 - Go to Step 17. -
16 Replace the ECM.
Did you complete the replacement?		 - Go to Step 17. -
17
  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 18.
18 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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