Test Description
The number below refers to the step number on the diagnostic table.
- 5: An incorrectly installed camshaft gear, crankshaft sprocket, or timing chain can cause this DTC to set.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) 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 | Start the engine. Allow the engine to reach normal operating temperature. Observe the DTC information with a scan tool. Does the scan tool display DTC P0016 failed this ignition? | Go to Step 4 | Go to Step 3 |
| 3 | Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. 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 4 | Go to Intermittent Conditions |
| 4 | Observe the DTC information with a scan tool. Does the scan tool display that DTC P0335, P0336, P0340, or P0341 also failed this ignition? | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | Go to Step 5 |
| 5 | Repair one of the following conditions: The camshaft gear and the crankshaft sprocket alignment marks are not aligned properly A timing chain tensioner condition An incorrectly installed timing chain Excessive play in the timing chain Incorrect indexing of the timing mark on either the crankshaft sprocket or the camshaft gear Refer to Timing Chain and Sprockets Cleaning and Inspection , Camshaft and Bearings Cleaning and Inspection , and Timing Chain and Sprockets Installation in Engine Mechanical. Did you complete the repair? | Go to Step 6 | |
| 6 | Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. 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 7 |
| 7 | 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 |
DTC P0016
The numbers below refer to the step numbers on the diagnostic table.
- 5: This step will determine if the MAP sensor pressure is within the proper range for a given altitude.
- 6: This step will determine if the MAP sensor voltage is within the proper range at idle.
- 7: This step will determine if the MAP sensor responds properly to the change in manifold pressure.
- 8: This step will determine if the throttle position (TP) sensors are operating properly.
- 9: This step will determine if any mechanical faults have caused this DTC to set.
- 10: This voltage drop will determine if high resistance has caused this DTC to set.
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) 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 | |
| 2 | Attempt to start the engine. Does the engine start? | Go to Step 3 | Go to Step 5 | |
| 3 | Observe the Diagnostic Trouble Code (DTC) Information with the scan tool. Does the scan tool display any DTCs set other than DTC P0068 or DTC P0101? | Go to Diagnostic Trouble Code (DTC) List - Vehicle | Go to Step 4 | |
| 4 | Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. 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 5 | Go to Diagnostic Aids | |
| 5 | IMPORTANT: The Altitude vs. Barometric Pressure table indicates a pressure range for a given altitude under normal weather conditions. Weather conditions consisting of very low or very high pressure and/or temperature may cause a reading to be slightly out of range. Turn ON the ignition, with the engine OFF. Observe the manifold absolute pressure (MAP) sensor kPa parameter with a scan tool. The MAP sensor pressure should be within the specified range for your altitude. Refer to Altitude vs Barometric Pressure . Is the MAP sensor pressure within the specified range, as indicated on the altitude vs. barometric pressure table? | Go to Step 6 | Go to DTC P0106 | |
| 6 | Observe the MAP sensor parameter with a scan tool. Start the engine. Does the MAP sensor parameter decrease? | Go to Step 7 | Go to DTC P0106 | |
| 7 | Idle the engine. Observe the manifold absolute pressure (MAP) sensor parameter with a scan tool. Increase the engine speed slowly to 3,000 RPM and then back to idle. Does the MAP sensor parameter change smoothly and gradually through the specified range of the test? | Go to Step 8 | Go to DTC P0106 | |
| 8 | Turn OFF the ignition for 30 seconds. Turn ON the ignition, with the engine OFF. Observe the throttle position (TP) indicated angle parameter with a scan tool. Depress the accelerator pedal completely. Is the TP indicated angle parameter within the specified range? | 95-100% | Go to Step 9 | Go to DTC P0120 |
| 9 | Turn OFF the ignition. Inspect for the following conditions: An improperly routed mass air flow (MAF) sensor harness A restricted or collapsed air intake duct A misaligned air intake duct A dirty or deteriorating air filter element Any objects blocking the air inlet screen of the MAF sensor, if equipped Any contamination or debris on the sensing elements of the MAF sensor Any water intrusion in the induction system Any vacuum leak downstream of the MAF sensor A skewed or stuck engine coolant temperature (ECT) sensor Any type of restriction in the exhaust system-Refer to Restricted Exhaust . Did you find and correct the condition? | Go to Step 14 | Go to Step 10 | |
| 10 | Disconnect the harness connector of the MAF sensor. Measure the battery voltage with a DMM. Turn ON the ignition, with the engine OFF. Connect a test lamp between the ignition 1 voltage circuit of the MAF sensor and a good ground. Refer to Circuit Testing . Connect a DMM to the probe of the test lamp and a good ground. Refer to Measuring Voltage Drop . Is the voltage within 0.5 volts of the specified value? | B+ | Go to Step 11 | Go to Step 12 |
| 11 | Test for an intermittent and for a poor connection at the MAF sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 14 | Go to Step 13 | |
| 12 | Repair the high resistance in the ignition 1 voltage circuit of the MAF sensor. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 14 | ||
| 13 | Replace the MAF/intake air temperature (IAT) sensor. Refer to Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Replacement . Did you complete the replacement? | Go to Step 14 | ||
| 14 | Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. 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 15 | |
| 15 | 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 | System OK | |
| IMPORTANT |
|---|
| The Altitude vs. Barometric Pressure table indicates a pressure range for a given altitude under normal weather conditions. Weather conditions consisting of very low or very high pressure and/or temperature may cause a reading to be slightly out of range. |
DTC P0101
The numbers below refer to the step numbers on the diagnostic table.
- 5: This step will determine if any mechanical faults have caused this DTC to set.
- 7: This voltage drop test will determine if high resistance has caused this DTC to set.
- 9: This step verifies the voltage signal from the ECM to the MAF sensor connector.
- 10: This step tests the signal circuit of the MAF sensor for a short to another 5-volt reference circuit.
- 11: This step will determine if the ECM is able to process the frequency signal that it receives from the MAF sensor.
- 14: This step will determine which portion of the circuit or which component is shorted to ground.
- 17: This step verifies that the signal circuit is not shorted to any other ECM circuit.
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) 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 | |
| 2 | Start the engine. Observe the MAF Sensor parameter with a scan tool. Is the MAF Sensor parameter less than the specified value? | 1,200 Hz | Go to Step 4 | Go to Step 3 |
| 3 | Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. 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 4 | Go to Diagnostic Aids | |
| 4 | Observe the MAF Sensor parameter with a scan tool. Move the harness and the connector of the mass air flow (MAF)/intake air temperature (IAT) sensor. Does the movement of the harness or the connector affect the MAF Sensor parameter? | Go to Step 20 | Go to Step 5 | |
| 5 | Turn OFF the ignition. Inspect for the following conditions: A restricted or collapsed air intake duct A misaligned air intake duct A dirty or deteriorating air filter element Any objects blocking the air inlet screen of the MAF/IAT sensor Any water intrusion in the Induction System Any contamination or debris on the sensing elements of the MAF sensor Did you find and correct the condition? | Go to Step 28 | Go to Step 6 | |
| 6 | Inspect the fuse in the ignition 1 voltage circuit of the MAF sensor. Is the fuse open? | Go to Step 14 | Go to Step 7 | |
| 7 | Turn ON the ignition, with the engine OFF. Measure the battery voltage with a DMM. Disconnect the MAF/IAT sensor. Connect a test lamp between the ignition 1 voltage circuit of the MAF sensor and a good ground. Refer to Probing Electrical Connectors . Connect the DMM to the probe of the test lamp and a good ground. Refer to Measuring Voltage Drop and Circuit Testing . Is the voltage within 0.5 volts of the specified value? | B+ | Go to Step 8 | Go to Step 21 |
| 8 | IMPORTANT: All electrical components and accessories must be turned OFF. Turn OFF the ignition for 60 seconds to allow the control modules to power down. Measure the resistance from the ground circuit of the MAF sensor to a good ground with a DMM. Refer to Circuit Testing . Is the resistance less than the specified value? | 5 ohms | Go to Step 9 | Go to Step 22 |
| 9 | Turn ON the ignition, with the engine OFF. Measure the voltage from the signal circuit of the MAF sensor to a good ground with a DMM. Refer to Circuit Testing . Is the voltage within the specified range? | 4.8-5.2 V | Go to Step 10 | Go to Step 13 |
| 10 | Connect a 3-amp fused jumper wire between the signal circuit of the MAF sensor and a good ground. Refer to Circuit Testing . Start the engine. Observe the DTC Information with a scan tool. Do any additional DTCs set? | Go to Step 24 | Go to Step 11 | |
| 11 | Turn OFF the ignition. Connect the voltage supply and ground the black lead of the J 38522 Variable Signal Generator to the vehicle. See Special Tools . Connect the red lead of the J 38522 to the signal circuit of the MAF sensor. See Special Tools . Refer to Probing Electrical Connectors . Set the Duty Cycle switch of the J 38522 to Normal. See Special Tools . Set the Frequency switch of the J 38522 to 5 K. See Special Tools . Set the Signal switch of the J 38522 to 5 V. See Special Tools . Start the engine and allow it to idle. Observe the MAF Sensor parameter with a scan tool. Is the MAF Sensor parameter within the specified range? | 4,950-5,025 Hz | Go to Step 12 | Go to Step 15 |
| 12 | IMPORTANT: An abnormal resistance on the signal circuit will disable the MAF sensor frequency before the voltage starts to drop out of the correct parameter of 4.8-5.2 volts. Turn OFF the ignition. Disconnect the engine control module (ECM). Test the MAF sensor signal circuit for a high resistance and for a short to the IAT signal circuit. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 28 | Go to Step 18 | |
| 13 | Is the voltage less than the specified value? | 4.8 V | Go to Step 15 | Go to Step 16 |
| 14 | IMPORTANT: The ignition 1 voltage circuit of the MAF sensor is spliced to other components of the vehicle. Test the ignition 1 voltage circuit for a short to ground. Refer to Testing for Short to Ground and Wiring Repairs .Did you find and correct the condition? | Go to Step 28 | ||
| 15 | Turn OFF the ignition. Disconnect the ECM. Test the signal circuit between the ECM and the MAF sensor for the following conditions: A high resistance An open circuit A short to ground Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 28 | Go to Step 17 | |
| 16 | IMPORTANT: Disconnecting the ECM connectors may eliminate the short to voltage if the signal circuit is shorted to another ECM circuit. Turn OFF the ignition. Disconnect the ECM. Turn ON the ignition, with the engine OFF. Measure the voltage from the signal circuit of the MAF sensor to a good ground with a DMM. Refer to Circuit Testing . Is the voltage more than the specified value? | 0 V | Go to Step 23 | Go to Step 17 |
| 17 | Measure the resistance from the signal circuit of the MAF sensor to all other circuits at both ECM connectors with a DMM. Refer to Circuit Testing . Is the resistance less than the specified value? | Infinity ohms | Go to Step 25 | Go to Step 19 |
| 18 | Test for an intermittent and for a poor connection at the MAF sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 28 | Go to Step 26 | |
| 19 | Test for an intermittent and for a poor connection at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 28 | Go to Step 27 | |
| 20 | Repair the wiring or the connector as needed. Refer to Wiring Repairs and Connector Repairs . Did you complete the repair? | Go to Step 28 | ||
| 21 | Repair the high resistance or the open in the MAF sensor ignition 1 voltage circuit. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 28 | ||
| 22 | Repair the high resistance or the open in the MAF sensor ground circuit. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 28 | ||
| 23 | Repair the short to voltage in the MAF sensor signal circuit. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 28 | ||
| 24 | Repair the short between the MAF sensor signal circuit and the 5-volt reference circuit for which the DTC set. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 28 | ||
| 25 | Repair the circuits that are shorted together. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 28 | ||
| 26 | Replace the MAF/IAT sensor. Refer to Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Replacement . Did you complete the replacement? | Go to Step 28 | ||
| 27 | Replace the ECM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 28 | ||
| 28 | Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. 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 29 | |
| 29 | 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 | System OK | |
| IMPORTANT |
|---|
| All electrical components and accessories must be turned OFF. |
| IMPORTANT |
|---|
| An abnormal resistance on the signal circuit will disable the MAF sensor frequency before the voltage starts to drop out of the correct parameter of 4.8-5.2 volts. |
| IMPORTANT |
|---|
| The ignition 1 voltage circuit of the MAF sensor is spliced to other components of the vehicle. |
| IMPORTANT |
|---|
| Disconnecting the ECM connectors may eliminate the short to voltage if the signal circuit is shorted to another ECM circuit. |
DTC P0102
The numbers below refer to the step numbers on the diagnostic table.
- 3: This step tests for electromagnetic interference (EMI) on the signal circuit of the MAF sensor. A frequency reading with the MAF sensor disconnected indicates an EMI related fault or a poor connection at the ECM. Disconnecting the MAF sensor may set additional related DTCs.
- 4: This step will determine if incorrect harness routing has caused this DTC to set.
- 5: This step will determine if water intrusion has caused this DTC to set.
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) 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 | |
| 2 | Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. 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 3 | Go to Diagnostic Aids | |
| 3 | Turn OFF the ignition. Disconnect the mass air flow (MAF) sensor. Start the engine. Observe the MAF sensor parameter with a scan tool. Is the MAF sensor parameter more than the specified value? | 0 Hz | Go to Step 4 | Go to Step 5 |
| 4 | Turn OFF the ignition. Inspect the harness of the MAF sensor for incorrect routing that is too close to the following components: Any aftermarket accessories-Refer to Checking Aftermarket Accessories . The secondary ignition wires or the coils Any solenoids Any relays Any motors Did you find and correct the condition? | Go to Step 10 | Go to Step 7 | |
| 5 | Turn OFF the ignition. Inspect the air induction system for any water intrusion. Did you find and correct the condition? | Go to Step 10 | Go to Step 6 | |
| 6 | Test for an intermittent and for a poor connection at the MAF sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 10 | Go to Step 8 | |
| 7 | Test for an intermittent and for a poor connection at the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 10 | Go to Step 9 | |
| 8 | Replace the MAF/intake air temperature (IAT) sensor. Refer to Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Replacement . Did you complete the replacement? | Go to Step 10 | ||
| 9 | Replace the ECM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 10 | ||
| 10 | Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. 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 11 | |
| 11 | 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 | System OK | |
DTC P0103
The numbers below refer to the step numbers on the diagnostic table.
- 5: This step tests the ability of the MAP sensor to correctly indicate BARO.
- 7: This step tests the ability of the MAP sensor to respond to an increase in engine vacuum.
- 9: This step tests for a proper MAP sensor pressure with an applied vacuum.
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) 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 | |
| 2 | Are DTCs P0107 or P0108 set? | Go to Diagnostic Trouble Code (DTC) List - Vehicle | Go to Step 3 | |
| 3 | Inspect for the following conditions: Vacuum hoses that are disconnected, damaged, or incorrectly routed Manifold absolute pressure (MAP) sensor seal that is missing or damaged Restrictions in the MAP sensor vacuum source Intake manifold vacuum leaks Did you find and correct the condition? | Go to Step 22 | Go to Step 4 | |
| 4 | IMPORTANT: The vehicle used for the comparison is not limited to the same type of vehicle as is being serviced. A vehicle known to provide an accurate reading is acceptable. Do you have access to another vehicle in which the MAP sensor pressure can be observed with a scan tool? | Go to Step 5 | Go to Step 6 | |
| 5 | Turn ON the ignition, with the engine OFF. Observe the MAP sensor pressure with a scan tool. Observe the MAP sensor pressure in the known good vehicle with a scan tool. Compare the values. Is the difference between the values less than the specified value? | 3 kPa | Go to Step 7 | Go to Step 12 |
| 6 | IMPORTANT: The Altitude vs. Barometric Pressure table indicates a pressure range for a given altitude under normal weather conditions. Weather conditions consisting of very low or very high pressure and/or very low or very high temperature may cause a reading to be slightly out of range. Turn ON the ignition, with the engine OFF. Observe the MAP sensor pressure with a scan tool. Refer to Altitude vs Barometric Pressure . The MAP sensor pressure should be within the range specified for your altitude. Does the MAP sensor indicate the correct barometric pressure? | Go to Step 7 | Go to Step 12 | |
| 7 | Turn OFF the ignition. Remove the MAP sensor from the intake manifold. Refer to Manifold Absolute Pressure (MAP) Sensor Replacement . Leave the MAP sensor connected to the electrical harness. Connect a J 23738-A Mityvac to the MAP sensor. Turn ON the ignition, with the engine OFF. Observe the MAP sensor pressure with a scan tool. Apply vacuum to the MAP sensor with the J 23738-A until 5 inches Hg is reached. Does the MAP sensor pressure change? | Go to Step 8 | Go to Step 12 | |
| 8 | Observe the MAP sensor pressure with the scan tool. Apply vacuum to the MAP sensor with the J 23738-A in 1 inch Hg increments until 15 inches Hg is reached. Each 1 inch Hg should decrease MAP sensor pressure by 3-4 kPa. Is the decrease in MAP sensor pressure consistent? | Go to Step 9 | Go to Step 12 | |
| 9 | Observe the MAP sensor pressure with the scan tool. Apply vacuum with the J 23738-A until 20 inches Hg is reached. Is the MAP sensor pressure less than the specified value? | 34 kPa | Go to Step 10 | Go to Step 12 |
| 10 | Observe the MAP sensor pressure with the scan tool. Disconnect the J 23738-A from the MAP sensor. Does the MAP sensor pressure return to the original reading observed in step 4 or step 5? | Go to Step 11 | Go to Step 20 | |
| 11 | Inspect for the following conditions: Incorrect cam timing-Refer to Timing Chain and Sprockets Replacement for the correct timing. Restricted exhaust flow-Refer to Restricted Exhaust . Worn piston rings-Refer to Engine Compression Test . Did you find and correct the condition? | Go to Step 22 | Go to Testing for Intermittent Conditions and Poor Connections | |
| 12 | Test for an intermittent and a poor connection at the MAP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 22 | Go to Step 13 | |
| 13 | Disconnect the MAP sensor harness connector. Turn ON the ignition, with the engine OFF. Measure the voltage from the 5-volt reference circuit of the MAP sensor to a good ground, with a DMM. Note the measurement as "Supply voltage". Connect a test lamp and a DMM in series between the 5-volt reference circuit and the low reference circuit of the MAP sensor at the harness connector. Measure the amperage with the DMM. Note the measurement as "Amperage". Is the amperage equal to the specified value? | 0 mA | Go to Step 17 | Go to Step 14 |
| 14 | Remove the DMM from the circuit. Connect the test lamp between the 5-volt reference circuit and the low reference circuit of the MAP sensor, at the harness connector. Measure the voltage from the 5-volt reference circuit at the test lamp to a good ground, with the DMM. Note the measurement as "Load voltage drop". Subtract the "Load voltage drop" from the "Supply voltage". Note the result as "Supply voltage drop". Divide the "Supply voltage drop" by the amperage. Is the result more than the specified value? | 5 ohms | Go to Step 16 | Go to Step 15 |
| 15 | Measure the voltage from the low reference circuit of the MAP sensor at the test lamp to a good ground, with the DMM. Note the result as "Low reference voltage drop". Divide the "Low reference voltage drop" by the amperage. Is the result more than the specified value? | 5 ohms | Go to Step 18 | Go to Step 20 |
| 16 | Test the 5-volt reference circuit between the engine control module (ECM) and the MAP sensor for high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 22 | Go to Step 19 | |
| 17 | Test the low reference circuit between the ECM and the MAP sensor for an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 22 | Go to Step 19 | |
| 18 | Test the low reference circuit between the ECM and the MAP sensor for high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 22 | Go to Step 19 | |
| 19 | Test for an intermittent and for a poor connection at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 22 | Go to Step 21 | |
| 20 | Replace the MAP sensor. Refer to Manifold Absolute Pressure (MAP) Sensor Replacement . Did you complete the replacement? | Go to Step 22 | ||
| 21 | Replace the ECM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 22 | ||
| 22 | Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. 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 23 | |
| 23 | 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 | System OK | |
| IMPORTANT |
|---|
| The vehicle used for the comparison is not limited to the same type of vehicle as is being serviced. A vehicle known to provide an accurate reading is acceptable. |
| IMPORTANT |
|---|
| The Altitude vs. Barometric Pressure table indicates a pressure range for a given altitude under normal weather conditions. Weather conditions consisting of very low or very high pressure and/or very low or very high temperature may cause a reading to be slightly out of range. |
DTC P0106
The number below refers to the step number on the diagnostic table.
- 4: Operate the vehicle within the same conditions as when the DTC failed. If you cannot duplicate the DTC, the information included in the Freeze Frame/Failure Records can help to locate an intermittent condition.
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) 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 | |
| 2 | Turn ON the ignition, with the engine OFF. Monitor the Diagnostic Trouble Code (DTC) Information with the scan tool. Is DTC P0641 also set? | Go to DTC P0641 | Go to Step 3 | |
| 3 | Observe the manifold absolute pressure (MAP) sensor parameter with the scan tool. Is the voltage less than the specified value? | 0.1 V | Go to Step 5 | Go to Step 4 |
| 4 | Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. 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 5 | Go to Testing for Intermittent Conditions and Poor Connections | |
| 5 | Turn OFF the ignition. Disconnect the MAP sensor electrical connector. Turn ON the ignition, with the engine OFF. Measure the voltage from the 5-volt reference circuit of the MAP sensor to a good ground, with a DMM, at the MAP sensor connector. Refer to Circuit Testing . Is the voltage more than the specified value? | 4.8 V | Go to Step 6 | Go to Step 7 |
| 6 | Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the MAP sensor and the signal circuit of the MAP sensor. Observe the MAP sensor parameter with the scan tool. Is the voltage more than the specified value? | 4.9 V | Go to Step 9 | Go to Step 8 |
| 7 | Test the 5-volt reference circuit between the engine control module (ECM) and the MAP sensor for an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 10 | |
| 8 | Test the MAP sensor signal circuit between the ECM and the MAP sensor for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 10 | |
| 9 | Test for an intermittent and for a poor connection at the MAP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 11 | |
| 10 | Test for an intermittent and for a poor connection at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 12 | |
| 11 | Replace the MAP sensor. Refer to Manifold Absolute Pressure (MAP) Sensor Replacement . Did you complete the replacement? | Go to Step 13 | ||
| 12 | Replace the ECM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 13 | ||
| 13 | Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. 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 14 | |
| 14 | 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 | System OK | |
DTC P0107
The number below refers to the step number on the diagnostic table.
- 6: This step tests for the proper operation of the circuit in the low voltage range.
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) 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 | |
| 2 | Observe the IAT sensor parameter with a scan tool. Is the IAT sensor parameter less than the specified value? | 38°C (-36°F) | Go to Step 4 | Go to Step 3 |
| 3 | Observe the Freeze Frame/Failure Records data for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. 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 4 | Go to Diagnostic Aids | |
| 4 | Disconnect the mass air flow/intake air temperature (MAF/IAT) sensor. Connect a DMM between the signal circuit of the IAT sensor and a good ground. Refer to Circuit Testing . Is the voltage more than the specified value? | 5.2 V | Go to Step 5 | Go to Step 6 |
| 5 | IMPORTANT: The sensor may be damaged if the circuit is shorted to a voltage source. Test the signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs .Did you find and correct the condition? | Go to Step 15 | Go to Step 12 | |
| 6 | Connect a 3-amp fused jumper wire between the signal circuit of the IAT sensor and the low reference circuit of the IAT sensor. Refer to Using Fused Jumper Wires . Observe the IAT sensor parameter with a scan tool. Is the IAT sensor parameter more than the specified value? | 115°C (240°F) | Go to Step 10 | Go to Step 7 |
| 7 | Connect a 3-amp fused jumper wire between the signal circuit of the IAT sensor and a good ground. Refer to Using Fused Jumper Wires . Observe the IAT sensor parameter with a scan tool. Is the IAT sensor parameter more than the specified value? | 128°C (262°F) | Go to Step 9 | Go to Step 8 |
| 8 | Test the signal circuit of the IAT sensor for an open circuit or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 12 | |
| 9 | Test the IAT sensor low reference circuit for high resistance or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 12 | |
| 10 | Test the IAT signal circuit for a short to any 5-volt reference circuit. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 11 | |
| 11 | IMPORTANT: The sensor may be damaged if the circuit is shorted to a voltage source. Test for an intermittent and for a poor connection at the IAT sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .Did you find and correct the condition? | Go to Step 15 | Go to Step 13 | |
| 12 | Test for an intermittent and for a poor connection at the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 14 | |
| 13 | Replace the IAT sensor. Refer to Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Replacement . Did you complete the replacement? | Go to Step 15 | ||
| 14 | Replace the ECM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 15 | ||
| 15 | Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. 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 16 | |
| 16 | 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 | System OK | |
| IMPORTANT |
|---|
| The sensor may be damaged if the circuit is shorted to a voltage source. |
| IMPORTANT |
|---|
| The sensor may be damaged if the circuit is shorted to a voltage source. |
DTC P0113
The numbers below refer to the step numbers on the diagnostic table.
- 7: A snapshot is the quickest method to capture the data before it changes.
- 8: An IAT sensor that is skewed low can cause this DTC to set.
- 10: This step will determine if high resistance has caused this DTC to set.
- 12: A high resistance short from the signal circuit to the low reference circuit can cause this DTC to set.
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) 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 | |
| 2 | IMPORTANT: The cooling fans are commanded ON when certain engine coolant temperature (ECT) DTCs are set. Inspect the cooling system coolant level.Is the cooling system coolant low? | Go to Draining and Filling Cooling System (LL8) or Draining and Filling Cooling System (LM4) | Go to Step 3 | |
| 3 | Observe and record the ambient air temperature of the vehicle environment using an accurate thermometer. Did you complete the action? | Go to Step 4 | ||
| 4 | IMPORTANT: The vehicle needs to have been OFF for at least 10 hours for the ECT and the intake air temperature (IAT) to be at ambient temperature. The vehicle should not have changed environments during this time. Has the engine been OFF for the specified amount of time? | 10 hrs | Go to Step 7 | Go to Step 5 |
| 5 | Remove the mass air flow (MAF)/IAT sensor. Refer to Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Replacement . Remove the ECT sensor. Refer to Engine Coolant Temperature (ECT) Sensor Replacement . Place the sensors on a work surface away from any heat source. Allow the sensors to reach the ambient air temperature for 30-60 minutes. Are the sensors at the ambient temperature? | Go to Step 6 | ||
| 6 | Connect the MAF/IAT sensor to the electrical connector, but DO NOT install it. Insulate the sensor from any engine heat source. Connect the ECT sensor to the electrical connector, but DO NOT install it. Insulate the sensor from any engine heat source. Are the sensors connected? | Go to Step 7 | ||
| 7 | IMPORTANT: The IAT sensor will start to warm up as soon as the ignition is turned ON. Turn ON the ignition. Take a snapshot of the Engine Data List with a scan tool. Refer to Scan Tool Snapshot Procedure . Review the snapshot data that was taken with the scan tool. Observe the ECT Sensor parameter with a scan tool. Observe the IAT Sensor parameter with a scan tool. Is the difference between the ECT Sensor parameter and the IAT Sensor parameter more than the specified value? | 15°C (27°F) | Go to Step 8 | Go to Testing for Intermittent Conditions and Poor Connections |
| 8 | Observe the recorded IAT Sensor parameter. Is the difference between the IAT Sensor parameter and the ambient air temperature less than the specified value? | 8°C (14°F) | Go to Step 9 | Go to Step 10 |
| 9 | Observe the recorded ECT Sensor parameter. Is the difference between the ECT Sensor parameter and the ambient air temperature less than the specified value? | 8°C (14°F) | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 12 |
| 10 | Disconnect the MAF/IAT sensor. Test for an intermittent and for a poor connection at the IAT sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 25 | Go to Step 11 | |
| 11 | At the sensor, measure the resistance between the IAT signal and the IAT low reference terminals with a DMM and record the value. Refer to Circuit Testing . Observe the recorded ambient air temperature. Compare the resistance measurement of the IAT sensor to the ambient air temperature using the Temperature vs. Resistance table. Refer to Temperature vs Resistance . Is the resistance measurement of the IAT sensor within the specified range? | Go to Step 14 | Go to Step 22 | |
| 12 | Disconnect the ECT sensor. Inspect for the following conditions: An ECT sensor leaking engine coolant internally through the sensor Corrosion on the ECT sensor terminals Corrosion on the ECT harness connector terminals Did you find and correct the condition? | Go to Step 25 | Go to Step 13 | |
| 13 | IMPORTANT: DO NOT hold the ECT sensor by the probe. At the sensor, measure the resistance between the ECT signal and the ECT low reference terminals with a DMM and record the value. Refer to Circuit Testing . Observe the recorded ambient air temperature. Compare the resistance measurement of the ECT sensor to the ambient air temperature using the Temperature vs. Resistance table. Refer to Temperature vs Resistance . Is the resistance measurement of the ECT sensor within the specified range? | Go to Step 15 | Go to Step 23 | |
| 14 | Measure the voltage from the IAT signal circuit to a good ground with a DMM. Refer to Circuit Testing . Is the voltage within the specified range? | 4.8-5.2 V | Go to Step 16 | Go to Step 17 |
| 15 | Measure the voltage from the ECT signal circuit to a good ground with a DMM. Refer to Circuit Testing . Is the voltage within the specified range? | 4.8-5.2 V | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 19 |
| 16 | IMPORTANT: All electrical components and accessories must be turned OFF. Performing this step will disable the diagnostic for 10 hours. Turn OFF the ignition for 90 seconds to allow the control modules to power down. Measure the resistance from the low reference circuit of the IAT sensor to a good ground with a DMM. Refer to Circuit Testing . Is the resistance less than the specified value? | 5 ohms | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 18 |
| 17 | Test the IAT signal circuit for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 25 | Go to Step 20 | |
| 18 | Test the IAT low reference circuit for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 25 | Go to Step 20 | |
| 19 | Test the ECT signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 25 | Go to Step 21 | |
| 20 | Test for an intermittent and for a poor connection at the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 25 | Go to Step 24 | |
| 21 | Test for shorted terminals and poor connections at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 25 | Go to Step 24 | |
| 22 | Replace the MAF/IAT sensor. Refer to Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Replacement . Did you complete the replacement? | Go to Step 25 | ||
| 23 | Replace the ECT sensor. Refer to Engine Coolant Temperature (ECT) Sensor Replacement . Did you complete the replacement? | Go to Step 25 | ||
| 24 | Replace the ECM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 25 | ||
| 25 | Reassemble the vehicle as necessary. Did you complete the action? | Go to Step 26 | ||
| 26 | IMPORTANT: This DTC will not run without the ignition being OFF for at least 10 hours. Clear the DTCs with a scan tool. Turn OFF the ignition for 10 hours. Start the engine. Operate the vehicle within the Conditions for Running in 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 27 | |
| 27 | 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 | System OK | |
| IMPORTANT |
|---|
| The cooling fans are commanded ON when certain engine coolant temperature (ECT) DTCs are set. |
| IMPORTANT |
|---|
| The vehicle needs to have been OFF for at least 10 hours for the ECT and the intake air temperature (IAT) to be at ambient temperature. The vehicle should not have changed environments during this time. |
| IMPORTANT |
|---|
| The IAT sensor will start to warm up as soon as the ignition is turned ON. |
| IMPORTANT |
|---|
| DO NOT hold the ECT sensor by the probe. |
| IMPORTANT |
|---|
| All electrical components and accessories must be turned OFF. Performing this step will disable the diagnostic for 10 hours. |
| IMPORTANT |
|---|
| This DTC will not run without the ignition being OFF for at least 10 hours. |
DTC P0116
The number below refers to the step number on the diagnostic table.
- 2: This step verifies that other DTCs are set.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) 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 | Are any other DTCs set? | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | Go to DTC P0121 |
DTC P0120
The numbers below refer to the step numbers on the diagnostic table.
- 2: This step verifies that a condition exists. If there is a condition with a TP sensor circuit, the scan tool will display Disagree.
- 5: This step tests for high resistance in the 5-volt reference circuit of the TP sensors. If the DMM does not display more than the specified voltage, there is high resistance in the circuit.
- 8: This step tests for high resistance in the low reference circuit of the TP sensor. The ECM must be completely powered down to obtain an accurate resistance reading. It may take up to 30 minutes for the ECM to power down after the ignition key is removed. Removal of the ECM fuse allows the ECM to power down completely.
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) 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 | |
| 2 | Turn ON the ignition, with the engine OFF. Perform the following tests: Rapidly depress the accelerator pedal from the rest position to the wide open throttle (WOT) position and release the pedal. Repeat the procedure several times. Slowly depress the accelerator pedal to WOT, then slowly return the pedal to closed throttle. Repeat the procedure several times. 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 | Turn OFF the engine. Turn ON the ignition, with the engine OFF. Observe the TP sensor 1 voltage parameter with a scan tool. Is the voltage within the specified range? | 3.4-3.9 V | Go to Step 4 | Go to Step 5 |
| 4 | Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. 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 5 | Go to Diagnostic Aids | |
| 5 | Turn OFF the ignition. NOTE: Refer to Disengaging Connectors Notice . Disconnect the throttle body harness connector. Turn ON the ignition, with the engine OFF. IMPORTANT: Use the J 35616-200 Test Lamp Kit for this test. If the J 35616-200 is not available, use a test lamp that measures more than 20 ohms. Connect a test lamp between the 5-volt reference circuit of the throttle position (TP) sensor and a good ground. Connect a DMM to the probe of the test lamp and a good ground. Refer to Measuring Voltage Drop . Is the voltage more than the specified value? | 4.8 V | Go to Step 6 | Go to Step 11 |
| 6 | Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the TP sensor and the signal 1 circuit of the TP sensor. 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 | Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the TP sensor and the signal 2 circuit of the TP sensor. 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 | Turn OFF the ignition. Remove the ECM fuse from the underhood fuse block. NOTE: Do NOT use a test lamp to test the continuity of the circuit. Damage to the control module may occur due to excessive current draw. Measure the resistance from the low reference circuit of the TP sensor to a good ground with a DMM. Is the resistance less than the specified value? | 5 ohms | Go to Step 13 | Go to Step 12 |
| 9 | Test the signal 1 circuit of TP sensor for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs . 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. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 14 | |
| 11 | IMPORTANT: The 5-volt reference circuits are internally and externally connected at the controller. Other sensors that share the 5-volt reference circuit may also have DTCs set. Disconnecting a sensor on the shared 5-volt reference circuit may isolate a shorted sensor. Review the electrical schematic and diagnose the shared circuits and sensors. Test the 5-volt reference circuit of the TP sensor and all shared 5-volt reference circuits for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs .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. Refer to Circuit Testing and Wiring Repairs . 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. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . 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 engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 16 | |
| 15 | Replace the throttle body assembly. Refer to Throttle Body Assembly Replacement . Did you complete the replacement? | Go to Step 17 | ||
| 16 | Replace the ECM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 17 | ||
| 17 | Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. 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 18 | |
| 18 | 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 | System OK | |
| NOTE |
|---|
| Refer to Disengaging Connectors Notice . |
| IMPORTANT |
|---|
| Use the J 35616-200 Test Lamp Kit for this test. If the J 35616-200 is not available, use a test lamp that measures more than 20 ohms. |
| NOTE |
|---|
| Do NOT use a test lamp to test the continuity of the circuit. Damage to the control module may occur due to excessive current draw. |
| IMPORTANT |
|---|
| The 5-volt reference circuits are internally and externally connected at the controller. Other sensors that share the 5-volt reference circuit may also have DTCs set. Disconnecting a sensor on the shared 5-volt reference circuit may isolate a shorted sensor. Review the electrical schematic and diagnose the shared circuits and sensors. |
DTC P0121
The numbers below refer to the step numbers on the diagnostic table.
- 2: This step verifies that a condition exists.
- 4: The TP sensors share a 5-volt reference circuit. If both DTCs P0122 and P0222 set, test for a condition in the 5-volt reference circuit.
- 5: The ECM produces a measurable steady-state amperage that provides the 5-volt reference to the TP sensors. If the amperage on the 5-volt reference circuit is less than 50 mA, test the 5-volt reference circuit for an open or a high resistance.
- 6: This step tests the signal 1 circuit of the TP sensor. If the TP sensor 1 voltage parameter is not within 4.8-5.2 volts, test for a condition in the signal 1 circuit.
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) 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 | |
| 2 | Turn ON the ignition, with the engine OFF. Observe the TP sensor 1 voltage parameter with a scan tool. Is the voltage less than the specified value? | 0.27 V | Go to Step 4 | Go to Step 3 |
| 3 | Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. 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 4 | Go to Diagnostic Aids | |
| 4 | Observe the DTC information with a scan tool. Did DTC P0222 also set? | Go to Step 5 | Go to Step 6 | |
| 5 | Turn OFF the ignition. NOTE: Refer to Disengaging Connectors Notice . Disconnect the throttle body harness connector. Turn ON the ignition, with the engine OFF. Set up a DMM to test amperage on the 400 mA scale. Measure the amperage from the 5-volt reference circuit of the throttle position (TP) sensor to a good ground. Is the amperage more than the specified value? | 50 mA | Go to Step 9 | Go to Step 7 |
| 6 | Turn OFF the ignition. NOTE: Refer to Disengaging Connectors Notice . Disconnect the throttle body harness connector. Turn ON the ignition, with the engine OFF. Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the TP sensor and the signal 1 circuit of the TP sensor. Observe the TP sensor 1 voltage parameter with a scan tool. Is the voltage within the specified range? | 4.8-5.2 V | Go to Step 9 | Go to Step 8 |
| 7 | IMPORTANT: The 5-volt reference circuits are internally connected within the controller. Other sensors that share the 5-volt reference circuit may also have DTCs set. Disconnecting a sensor on the shared 5-volt reference circuit may isolate a shorted sensor. Review the electrical schematic and diagnose the shared circuits and sensors. Test the 5-volt reference circuit of the TP sensor and all shared 5-volt reference circuits for an open, a short to ground, or for high resistance. Refer to Circuit Testing and Wiring Repairs .Did you find and correct the condition? | Go to Step 13 | Go to Step 10 | |
| 8 | Test the signal 1 circuit of the TP sensor for a short to ground, an open, or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 10 | |
| 9 | Test for an intermittent and for a poor connection at the throttle body assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 11 | |
| 10 | Test for an intermittent and for a poor connection at the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 12 | |
| 11 | Replace the throttle body assembly. Refer to Throttle Body Assembly Replacement . Did you complete the replacement? | Go to Step 13 | ||
| 12 | Replace the ECM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 13 | ||
| 13 | Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. 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 14 | |
| 14 | 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 | System OK | |
| NOTE |
|---|
| Refer to Disengaging Connectors Notice . |
| NOTE |
|---|
| Refer to Disengaging Connectors Notice . |
| IMPORTANT |
|---|
| The 5-volt reference circuits are internally connected within the controller. Other sensors that share the 5-volt reference circuit may also have DTCs set. Disconnecting a sensor on the shared 5-volt reference circuit may isolate a shorted sensor. Review the electrical schematic and diagnose the shared circuits and sensors. |
DTC P0122
The numbers below refer to the step numbers on the diagnostic table.
- 2: This step verifies that a condition exists.
- 5: This step tests the signal circuit for a short to voltage. If the scan tool displays a voltage after the TP sensor is disconnected, the circuit is shorted to a voltage.
- 7: This step tests for high resistance in the low reference circuit of the TP sensor. The ECM must be completely powered down to obtain an accurate resistance reading. It may take up to 30 minutes for the ECM to power down after the ignition key is removed. Removal of the ECM fuse allows the ECM to power down completely.
- 8: This step tests the low reference circuit for a short to voltage.
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) 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 | |
| 2 | Turn ON the ignition, with the engine OFF. Observe the TP sensor 1 voltage parameter with a scan tool. Is the voltage more than the specified value? | 4.7 V | Go to Step 5 | Go to Step 3 |
| 3 | Observe the DTC information with a scan tool. Did DTC P0223 fail this ignition? | Go to Step 5 | Go to Step 4 | |
| 4 | Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. 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 5 | Go to Diagnostic Aids | |
| 5 | Turn OFF the ignition. NOTE: Refer to Disengaging Connectors Notice . Disconnect the throttle body harness connector. Turn ON the ignition, with the engine OFF. Observe the TP sensor 1 voltage parameter with a scan tool. Is the voltage less than the specified value? | 0.1 V | Go to Step 6 | Go to Step 9 |
| 6 | Measure the voltage between the 5-volt reference circuit of the throttle position (TP) sensor and a good ground with a DMM. Is the voltage more than the specified value? | 5.2 V | Go to Step 10 | Go to Step 7 |
| 7 | Turn OFF the ignition. Remove the ECM fuse from the underhood fuse block. NOTE: Do NOT use a test lamp to test the continuity of the circuit. Damage to the control module may occur due to excessive current draw. 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 ohms | Go to Step 12 | Go to Step 8 |
| 8 | Install the ECM fuse into the underhood electrical center. Turn ON the ignition, with the engine OFF. Measure the voltage between the low reference circuit of the TP sensor and the engine control module (ECM) housing, with a DMM. Refer to Circuit Testing . Is the voltage less than the specified value? | 1 V | Go to Step 11 | Go to Step 14 |
| 9 | Test the signal circuit of the TP sensor 1 for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 13 | |
| 10 | IMPORTANT: The 5-volt reference circuits are internally connected within the controller. Other sensors that share the 5-volt reference circuit may also have DTCs set. Disconnecting a sensor on the shared 5-volt reference circuit may isolate a shorted sensor. Review the electrical schematic and diagnose the shared circuits and sensors. Test the 5-volt reference circuit of the TP sensor and all shared 5-volt reference circuits for a short to voltage. Refer to Circuit Testing and Wiring Repairs .Did you find and correct the condition? | Go to Step 17 | Go to Step 13 | |
| 11 | Turn OFF the ignition. Disconnect the ECM. Test the low reference circuit of the TP sensor for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 13 | |
| 12 | Test for shorted terminals and for poor connections at the TP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 15 | |
| 13 | Test for shorted terminals and for poor connections at the ECM. Refer to Circuit Testing and Connector Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 16 | |
| 14 | IMPORTANT: The control module and/or the TP sensor may be damaged if the circuit is shorted to battery positive voltage. Repair the short to voltage in the low reference circuit of the TP sensor. Refer to Wiring Repairs .Did you complete the repair? | Go to Step 17 | ||
| 15 | Replace the throttle body assembly. Refer to Throttle Body Assembly Replacement . Did you complete the replacement? | Go to Step 17 | ||
| 16 | Replace the ECM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 17 | ||
| 17 | Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. 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 18 | |
| 18 | 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 | System OK | |
| NOTE |
|---|
| Refer to Disengaging Connectors Notice . |
| NOTE |
|---|
| Do NOT use a test lamp to test the continuity of the circuit. Damage to the control module may occur due to excessive current draw. |
| IMPORTANT |
|---|
| The 5-volt reference circuits are internally connected within the controller. Other sensors that share the 5-volt reference circuit may also have DTCs set. Disconnecting a sensor on the shared 5-volt reference circuit may isolate a shorted sensor. Review the electrical schematic and diagnose the shared circuits and sensors. |
| IMPORTANT |
|---|
| The control module and/or the TP sensor may be damaged if the circuit is shorted to battery positive voltage. |
DTC P0123
The number below refers to the step number on the diagnostic table.
- 2: If the voltage is varying above and below the specified range, the condition is not present.
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views or Engine Control Module (ECM) 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 | Start the engine. Allow the engine to reach operating temperature. Refer to Scan Tool Data List . Observe the affected HO2S voltage parameter with a scan tool. Is the HO2S voltage parameter varying above and below the specified range? | 300-600 mV | Go to Step 3 | Go to Step 4 |
| 3 | Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. 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 4 | Go to Intermittent Conditions | |
| 4 | Turn OFF the ignition. Disconnect the affected heated oxygen sensor (HO2S). Turn ON the ignition, with the engine OFF. Observe the HO2S voltage parameter with a scan tool. Is the HO2S voltage parameter less than the specified value? | 100 mV | Go to Step 6 | Go to Step 5 |
| 5 | Connect a 3-amp fused jumper wire between the high signal circuit of the HO2S harness connector on the engine harness side and a good ground. Observe the HO2S voltage parameter with a scan tool. Is the HO2S voltage parameter less than the specified value? | 100 mV | Go to Step 7 | Go to Step 8 |
| 6 | Test the HO2S high signal circuit for a short to ground. Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 15 | Go to Step 9 | |
| 7 | Test the HO2S low signal circuit for a short to the HO2S heater low control circuit. Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 15 | Go to Step 10 | |
| 8 | Test the HO2S high signal circuit for an open or high resistance. Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 15 | Go to Step 12 | |
| 9 | Test the HO2S high signal circuit for a short to the following circuits: HO2S low signal circuit HO2S heater low control circuit Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 15 | Go to Step 12 | |
| 10 | The HO2S may be detecting a lean exhaust condition or may be contaminated. Inspect for the following conditions: NOTE: Refer to Silicon Contamination of Heated Oxygen Sensors Notice in Cautions and Notices. A silicon contaminated HO2S Any water intrusion into the HO2S connector An exhaust leak between the HO2S and the engine Any vacuum leaks An incorrect fuel pressure-Refer to Fuel System Diagnosis . Any lean fuel injectors-Refer to Fuel Injector Balance Test with Tech 2 . An inaccurate mass air flow (MAF) sensor-Refer to Scan Tool Data List . Repair any of the above or similar engine conditions as necessary. Did you find and correct the condition? | Go to Step 15 | Go to Step 11 | |
| 11 | Test for shorted terminals and for poor connections at the HO2S. Refer to the following in Wiring Systems: Testing for Intermittent Conditions and Poor Connections Connector Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 15 | Go to Step 13 | |
| 12 | Test for shorted terminals and for poor connections at the engine control module (ECM). Refer to the following in Wiring Systems: Testing for Intermittent Conditions and Poor Connections Connector Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 15 | Go to Step 14 | |
| 13 | Replace the affected HO2S. Refer to Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 or Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1 . Did you complete the replacement? | Go to Step 15 | ||
| 14 | Replace the ECM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 15 | ||
| 15 | Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. 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 16 | |
| 16 | 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 | |
| NOTE |
|---|
| Refer to Silicon Contamination of Heated Oxygen Sensors Notice in Cautions and Notices. |
DTC P0131 or P0151
The number below refers to the step number on the diagnostic table.
- 2: If the voltage is varying above and below the specified range, the condition is not present.
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views or Engine Control Module (ECM) 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 | Start the engine. Allow the engine to reach operating temperature. Refer to Scan Tool Data List . Observe the affected HO2S voltage parameter with a scan tool. Is the HO2S voltage parameter varying above and below the specified range? | 300-600 mV | Go to Step 3 | Go to Step 4 |
| 3 | Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. 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 4 | Go to Intermittent Conditions | |
| 4 | Turn OFF the ignition. Disconnect the affected heated oxygen sensor (HO2S). Turn ON the ignition, with the engine OFF. Observe the HO2S voltage parameter with a scan tool. Is the HO2S voltage parameter within the specified range? | 400-500 mV | Go to Step 5 | Go to Step 6 |
| 5 | Connect a 3-amp fused jumper wire between the high signal circuit of the HO2S harness connector on the engine harness side and a good ground. Observe the HO2S voltage parameter with a scan tool. Is the HO2S voltage parameter less than the specified value? | 100 mV | Go to Step 7 | Go to Step 8 |
| 6 | Test the HO2S high signal circuit for a short to the HO2S heater low control circuit. Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 17 | Go to Step 10 | |
| 7 | Remove the jumper wire from the previous step. Connect a 3-amp fused jumper wire between the high signal circuit of the HO2S harness connector on the engine harness side and the low signal circuit of the HO2S harness connector on the engine harness side. Observe the HO2S voltage parameter with a scan tool. Is the HO2S voltage parameter less than the specified value? | 100 mV | Go to Step 9 | Go to Step 11 |
| 8 | Test the HO2S high signal circuit for an open or high resistance. Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 17 | Go to Step 14 | |
| 9 | Test the HO2S low signal circuit for a short to the HO2S heater low control circuit. Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 17 | Go to Step 12 | |
| 10 | IMPORTANT: The sensor may be damaged if the circuit is shorted to a voltage source. Test the HO2S high signal circuit for a short to voltage. Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 17 | Go to Step 14 | |
| 11 | Test the HO2S low signal circuit for an open or high resistance. Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 17 | Go to Step 14 | |
| 12 | The HO2S may be detecting a rich exhaust condition or may be contaminated. Inspect for the following conditions: NOTE: Refer to Silicon Contamination of Heated Oxygen Sensors Notice in Cautions and Notices. A silicon contaminated HO2S Any water intrusion into the HO2S connector Engine oil contaminated with fuel An evaporative emission (EVAP) canister purge condition An incorrect fuel pressure-Refer to Fuel System Diagnosis . Any rich fuel injectors-Refer to Fuel Injector Balance Test with Tech 2 . An inaccurate mass air flow (MAF) sensor-Refer to Scan Tool Data List . An air intake restriction or collapsed air intake duct Repair any of the above or similar engine conditions as necessary. Did you find and correct the condition? | Go to Step 17 | Go to Step 13 | |
| 13 | Test for shorted terminals and for poor connections at the HO2S. Refer to the following in Wiring Systems: Testing for Intermittent Conditions and Poor Connections Connector Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs 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 engine control module (ECM). Refer to the following in Wiring Systems: Testing for Intermittent Conditions and Poor Connections Connector Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 17 | Go to Step 16 | |
| 15 | Replace the affected HO2S. Refer to Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 or Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1 . Did you complete the replacement? | Go to Step 17 | ||
| 16 | Replace the ECM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 17 | ||
| 17 | Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. 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 18 | |
| 18 | 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 | |
| IMPORTANT |
|---|
| The sensor may be damaged if the circuit is shorted to a voltage source. |
| NOTE |
|---|
| Refer to Silicon Contamination of Heated Oxygen Sensors Notice in Cautions and Notices. |
DTC P0132 or P0152
The number below refers to the step number on the diagnostic table.
- 2: If the voltage is varying above and below the specified value, the condition is not present.
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views or Engine Control Module (ECM) 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 | Start the engine. Allow the engine to reach operating temperature. Refer to Scan Tool Data List . Operate the engine at 1,500 RPM for 30 seconds. Observe the affected HO2S voltage parameter with a scan tool. Is the HO2S voltage parameter varying above and below the specified range? | 250-625 mV | Go to Step 3 | Go to Step 4 |
| 3 | Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. 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 4 | Go to Intermittent Conditions | |
| 4 | Turn OFF the ignition. Disconnect the affected heated oxygen sensor (HO2S). Connect a 3-amp fused jumper wire between the high signal circuit of the HO2S harness connector on the engine harness side and a good ground. Turn ON the ignition, with the engine OFF. Observe the HO2S voltage parameter with a scan tool. Is the HO2S voltage parameter less than the specified value? | 100 mV | Go to Step 6 | Go to Step 5 |
| 5 | Test the HO2S high signal circuit for an open or high resistance. Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 12 | Go to Step 9 | |
| 6 | Remove the jumper wire from the previous step. Connect a 3-amp fused jumper wire between the high signal circuit of the HO2S harness connector on the engine harness side and the low signal circuit of the HO2S harness connector on the engine harness side. Observe the HO2S voltage parameter with a scan tool. Is the HO2S voltage parameter less than the specified value? | 100 mV | Go to Step 8 | Go to Step 7 |
| 7 | Test the HO2S low signal circuit for an open or high resistance. Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 12 | Go to Step 9 | |
| 8 | Test for shorted terminals and for poor connections at the HO2S. Refer to the following in Wiring Systems: Testing for Intermittent Conditions and Poor Connections Connector Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 12 | Go to Step 10 | |
| 9 | Test for shorted terminals and for poor connections at the engine control module (ECM). Refer to the following in Wiring Systems: Testing for Intermittent Conditions and Poor Connections Connector Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 12 | Go to Step 11 | |
| 10 | NOTE: Refer to Silicon Contamination of Heated Oxygen Sensors Notice in Cautions and Notices. IMPORTANT: The HO2S may be damaged due to contamination. Prior to replacing the HO2S, inspect for the following sources of contamination: A silicon contaminated HO2S Fuel contamination-Refer to Alcohol/Contaminants-in-Fuel Diagnosis (with Special Tool) or Alcohol/Contaminants-in-Fuel Diagnosis (without Special Tool) . Engine oil consumption-Refer to Oil Consumption Diagnosis in Engine Mechanical. Engine coolant consumption-Refer to Loss of Coolant in Engine Cooling. Replace the affected HO2S. Refer to Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 or Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1 .Did you complete the replacement? | Go to Step 12 | ||
| 11 | Replace the ECM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 12 | ||
| 12 | Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. 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 13 | |
| 13 | 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 | |
| NOTE |
|---|
| Refer to Silicon Contamination of Heated Oxygen Sensors Notice in Cautions and Notices. |
| IMPORTANT |
|---|
| The HO2S may be damaged due to contamination. Prior to replacing the HO2S, inspect for the following sources of contamination |
DTC P0133 or P0153
The number below refers to the step number on the diagnostic table.
- 3: If the voltage is varying above and below the specified value, the condition is not present.
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views or Engine Control Module (ECM) 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 | Start the engine. Wait 1 minute to allow the HO2S heater current to stabilize. Observe the affected HO2S heater current parameter with a scan tool. Is the HO2S heater current parameter within the specified range? | 0.25-3.125 A | Go to Step 3 | Go to DTC P0135, P0141, P0155, or P0161 |
| 3 | Allow the engine to reach operating temperature. Refer to Scan Tool Data List . Operate the engine at 1,500 RPM for 30 seconds. Observe the affected HO2S voltage parameter with a scan tool. Is the HO2S voltage parameter varying above and below the specified range? | 300-600 mV | Go to Step 4 | Go to Step 5 |
| 4 | Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. 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 5 | Go to Intermittent Conditions | |
| 5 | Turn OFF the ignition. Disconnect the affected HO2S. Turn ON the ignition, with the engine OFF. Observe the HO2S voltage parameter with a scan tool. Is the HO2S voltage parameter more than the specified value? | 800 mV | Go to Step 7 | Go to Step 6 |
| 6 | Measure the voltage from the high signal circuit of the HO2S harness connector on the engine harness side to a good ground with a DMM. Refer to Circuit Testing in Wiring Systems. Is the voltage more than the specified value? | 0.2 V | Go to Step 8 | Go to Step 9 |
| 7 | IMPORTANT: The sensor may be damaged if the circuit is shorted to a voltage source. Test the HO2S high signal circuit for a short to voltage. Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 17 | Go to Step 14 | |
| 8 | Measure the voltage from the low signal circuit of the HO2S harness connector on the engine harness side to a good ground with a DMM. Refer to Circuit Testing in Wiring Systems. Is the voltage more than the specified value? | 2 V | Go to Step 12 | Go to Step 10 |
| 9 | Test the HO2S high signal circuit for an open or high resistance. Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 17 | Go to Step 14 | |
| 10 | Connect a 3-amp fused jumper wire between the high signal circuit of the HO2S harness connector on the engine harness side and the low signal circuit of the HO2S harness connector on the engine harness side. Observe the HO2S voltage parameter with a scan tool. Is the HO2S voltage parameter less than the specified value? | 100 mV | Go to Step 13 | Go to Step 11 |
| 11 | Test the HO2S low signal circuit for an open or high resistance. Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 17 | Go to Step 14 | |
| 12 | Test the HO2S low signal circuit for a short to voltage. Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs 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 HO2S. Refer to the following in Wiring Systems: Testing for Intermittent Conditions and Poor Connections Connector Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs 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 engine control module (ECM). Refer to the following in Wiring Systems: Testing for Intermittent Conditions and Poor Connections Connector Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 17 | Go to Step 16 | |
| 15 | Replace the affected HO2S. Refer to Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 or Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1 . Did you complete the replacement? | Go to Step 17 | ||
| 16 | Replace the ECM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 17 | ||
| 17 | Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. 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 18 | |
| 18 | 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 | |
| IMPORTANT |
|---|
| The sensor may be damaged if the circuit is shorted to a voltage source. |
DTC P0134 or P0154
The number below refers to the step number on the diagnostic table.
- 2: If the voltage does not change more than the specified value, the condition is present.
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views or Engine Control Module (ECM) 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 | Start the engine. Allow the engine to reach operating temperature. Refer to Scan Tool Data List . Operate the engine at 1,500 RPM for 30 seconds. While observing the affected HO2S voltage parameter with a scan tool, quickly cycle the throttle from closed throttle to wide open throttle, 3 times. Did the HO2S voltage parameter change more than the specified value? | 200 mV | Go to Step 3 | Go to Step 4 |
| 3 | Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. 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 4 | Go to Intermittent Conditions | |
| 4 | Turn OFF the ignition. Disconnect the affected heated oxygen sensor (HO2S). Turn ON the ignition, with the engine OFF. Observe the HO2S voltage parameter with a scan tool. Is the HO2S voltage parameter less than the specified value? | 100 mV | Go to Step 6 | Go to Step 5 |
| 5 | Observe the HO2S voltage parameter with a scan tool. Is the HO2S voltage parameter more than the specified value? | 800 mV | Go to Step 7 | Go to Step 8 |
| 6 | Test the HO2S high signal circuit for a short to ground. Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 20 | Go to Step 9 | |
| 7 | IMPORTANT: The sensor may be damaged if the circuit is shorted to a voltage source. Test the HO2S high signal circuit for a short to voltage. Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 20 | Go to Step 17 | |
| 8 | Measure the voltage from the low signal circuit of the HO2S harness connector on the engine harness side to a good ground with a DMM. Refer to Circuit Testing in Wiring Systems. Is the voltage more than the specified value? | 2 V | Go to Step 10 | Go to Step 11 |
| 9 | Test the HO2S high signal circuit for a short to the HO2S low signal circuit. Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 20 | Go to Step 17 | |
| 10 | Test the HO2S low signal circuit for a short to voltage. Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 20 | Go to Step 17 | |
| 11 | Connect a 3-amp fused jumper wire between the high signal circuit of the HO2S harness connector on the engine harness side and a good ground. Observe the HO2S voltage parameter with a scan tool. Is the HO2S voltage parameter less than the specified value? | 100 mV | Go to Step 12 | Go to Step 14 |
| 12 | Remove the jumper wire from the previous step. Connect a 3-amp fused jumper wire between the high signal circuit of the HO2S harness connector on the engine harness side and the low signal circuit of the HO2S harness connector on the engine harness side. Observe the HO2S voltage parameter with a scan tool. Is the HO2S voltage parameter less than the specified value? | 100 mV | Go to Step 15 | Go to Step 13 |
| 13 | Test the HO2S low signal circuit for an open or high resistance. Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 20 | Go to Step 17 | |
| 14 | Test the HO2S high signal circuit for an open or high resistance. Refer to the following in Wiring Systems: Circuit Testing Wiring Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 20 | Go to Step 17 | |
| 15 | The HO2S may be detecting a rich exhaust condition, a lean exhaust condition, or the HO2S may be contaminated. Inspect for the following conditions: NOTE: Refer to Silicon Contamination of Heated Oxygen Sensors Notice in Cautions and Notices. A silicon contaminated HO2S Any water intrusion into the HO2S connector An exhaust leak between the HO2S and the engine Any vacuum leaks Engine oil contaminated with fuel An incorrect fuel pressure-Refer to Fuel System Diagnosis . Any lean or rich fuel injectors-Refer to Fuel Injector Balance Test with Tech 2 . An inaccurate mass air flow (MAF) sensor-Refer to Scan Tool Data List . Repair any of the above or similar engine conditions as necessary. Did you find and correct the condition? | Go to Step 20 | Go to Step 16 | |
| 16 | Test for shorted terminals and for poor connections at the HO2S. Refer to the following in Wiring Systems: Testing for Intermittent Conditions and Poor Connections Connector Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 20 | Go to Step 18 | |
| 17 | Test for shorted terminals and for poor connections at the engine control module (ECM). Refer to the following in Wiring Systems: Testing for Intermittent Conditions and Poor Connections Connector Repairs Heated Oxygen Sensor (HO2S) Wiring Repairs Did you find and correct the condition? | Go to Step 20 | Go to Step 19 | |
| 18 | Replace the affected HO2S. Refer to Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 2 or Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2 . Did you complete the replacement? | Go to Step 20 | ||
| 19 | Replace the engine control module (ECM). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 20 | ||
| 20 | Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. 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 21 | |
| 21 | 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 | |
| IMPORTANT |
|---|
| The sensor may be damaged if the circuit is shorted to a voltage source. |
| NOTE |
|---|
| Refer to Silicon Contamination of Heated Oxygen Sensors Notice in Cautions and Notices. |
DTC P0136 or P0156
See also:
• Scan Tool Data List