Circuit Description
The powertrain control module (PCM) provides a 5 volt supply for use in powering up the sensors. This test monitors the voltage present at terminals BRD13 [shared by boost and crankshaft position (CKP) sensors] and BRD14 [the Optical/Fuel temperature sensor (Cam/HI. Res)].
Conditions for Running the DTC
The ignition switch is in the ON position.
Conditions for Setting the DTC
5 volt reference is less than 1 volt.
Action Taken When the DTC Sets
| • | The PCM will not illuminate the malfunction indicator lamp (MIL). |
| • | The PCM records the operating conditions at the time the diagnostic fails. This information is stored in the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The PCM will turn the MIL off after 3 consecutive trips without a fault condition. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures. |
| • | The scan tool Clear Info function was used. |
Diagnostic Aids
During the time the failure is present, the setting of additional DTCs that share a 5 volt reference may also set.
Test Description
The number(s) below refer to the step number(s) on the Diagnostic Table.
-
Checks to confirm that a DTC is still present.
-
Checks to determine if there is a 5 volt reference from the PCM.
-
Checks to determine if there is a short-to-ground in the reference circuit or a short-to-ground in the PCM.
-
This step determines if the short is being caused by one of the sensors or the short is in the wiring harness.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Important: Before clearing the DTCs, use the scan tool Capture Info function to save the Freeze Frame and the Failure records for reference. The control module's data is deleted once the Clear Info function is used. Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||
Does the DTC reset? | -- | |||
Is the voltage less than the specified value? | 4.0V | |||
Is the test lamp ON? | -- | |||
5 | The DTC is intermittent. If no additional DTCs are stored, refer to the Diagnostic Aids. If any additional DTCs are stored, refer to those table(s). Are there any additional DTCs stored? | -- | Go to the applicable DTC table | Go to Diagnostic Aids |
6 | Replace the boost sensor. Refer to Boost Sensor Replacement . Is the action complete? | -- | -- | |
With the J 35616-200 unpowered test lamp still probing the boost sensor 5 volt reference circuit at the PCM, disconnect each sensor, one at a time, that shares the 5 volt reference with the boost sensor. Does the J 35616-200 unpowered test lamp turn OFF when one of the sensors is disconnected? | -- | |||
8 |
Is the test lamp ON? | -- | ||
9 | Replace the sensor that caused the J 35616-200 unpowered test lamp to turn OFF. Is the action complete? | -- | -- | |
10 | Repair a short to ground in a 5 volt reference circuit. Refer to Wiring Repairs . Is the action complete? | -- | -- | |
11 |
Important: The new PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming . Replace the PCM. Is the action complete? | -- | -- | |
12 |
Does the scan tool indicate the diagnostic Passed? | -- | ||
13 | Does the scan tool display any additional undiagnosed DTCs? | -- | Go to the applicable DTC table | System OK |
