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Home >> Chevrolet >> 2005 >> Malibu Maxx >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Control System - 2.2L (L61) - DTC P0030 Or P0036 To DTC P0136) >> Diagnosis >> DTC P0120 >> Conditions for Clearing the MIL/DTC

Conditions for Clearing the MIL/DTC

WARNING: This page is about a different variant/trim than selected.
DTC P0120

Step Action Values Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Powertrain Control Module (PCM) Connector End Views or Engine Controls Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
  1. Turn ON the ignition, with the engine OFF.
  2. With a scan tool, observe the throttle position (TP) sensor voltage with the accelerator pedal in the rest position.
Does the scan tool indicate voltage less than the first value or greater than the second value?		 0.27 V
4.67 V		 Go to Step 5  Go to Step 3 
3 Is DTC P2135 also set? - Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information Go to Step 4 
4
  1. Observe the Freeze Frame/Failure Records data for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text or as close to the Freeze Frame/Failure Records data that you observed.
Does the DTC fail this ignition?		 - Go to Step 5  Go to Intermittent Conditions
5
  1. Turn OFF the ignition.
  2. Disconnect the throttle body harness connector.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the TP Sensor 1 Voltage parameter.
Does the scan tool indicate voltage at the specified value?		 0 V Go to Step 6  Go to Step 11 
6
  1. Connect a fused jumper wire between the TP sensor 5-volt reference circuit and the TP sensor signal circuit at the throttle body harness connector.
  2. With a scan tool, observe the TP Sensor 1 Voltage parameter.
Does the scan tool indicate the TP sensor 1 voltage at the specified value?		 5 V Go to Step 7  Go to Step 8 
7 Measure the resistance of the low reference circuit of the TP sensor 1 with a DMM. Refer to Circuit Testing in Wiring Systems.
Is the resistance less than the specified value?		 5 ohm Go to Step 17  Go to Step 13 
8 With a DMM, measure the voltage of the TP sensor 1 5-volt reference circuit.
Does the DMM indicate voltage at the specified value?		 5 V Go to Step 10  Go to Step 9 
9 Does the DMM indicate voltage less than the specified value on the TP sensor 1 5-volt reference circuit? 5 V Go to Step 14  Go to Step 16 
10 Test the TP sensor 1 signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 21  Go to Step 12 
11 Test the TP sensor 1 signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 21  Go to Step 19 
12 Test the TP sensor 1 signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 21  Go to Step 19 
13 Test the TP sensor 1 low reference circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 21  Go to Step 19 
14 Test the TP sensor 1 5-volt reference circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 21  Go to Step 15 
15 Test the TP sensor 1 5-volt reference circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 21  Go to Step 19 
16 Test the TP sensor 1 5-volt reference circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 21  -
17 Inspect for poor connections at the throttle body harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 21  Go to Step 18 
18 Replace the throttle body assembly. Refer to Throttle Body Assembly Replacement .
Did you complete the replacement?		 - Go to Step 21  -
19 Inspect for poor connections at the powertrain control module (PCM) harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 21  Go to Step 20 
20 Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 21  -
21
  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.
Did the DTC fail this ignition?		 - Go to Step 2  Go to Step 22 
22 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information System OK
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