Test Description
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers on the diagnostic table.
- 2: The boost sensor 5-volt reference circuit is shared with other sensors. If DTC P0651 is set, this indicates that the 5-volt reference circuit is shorted to ground and should be diagnosed first. The short may be on another sensor 5-volt reference circuit.
- 4: If you cannot duplicate the DTC, the information included in the Freeze Frame/Failure Records data can aid in locating an intermittent condition.
DTC P0237 (Federal RPO FE9, NG1)
| 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-Engine Controls? | - | Go to Step 2 | Go to Diagnostic System Check - Engine Controls |
| 2 |
|
- | Go to DTC P0651 | Go to Step 3 |
| 3 | Observe the boost sensor pressure with a scan tool. Does the scan tool indicate that the pressure is less than the specified value? |
38 kPa | Go to Step 5 | Go to Step 4 |
| 4 |
|
- | Go to Step 5 | Go to Intermittent Conditions |
| 5 |
|
- | Go to Step 7 | Go to Step 6 |
| 6 | Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the boost sensor and the signal circuit of the boost sensor. Does the scan tool indicate that the pressure is more than the specified value? |
254 kPa | Go to Step 9 | Go to Step 8 |
| 7 | Test the 5-volt reference circuit of the boost sensor for high resistance or an open. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 13 | Go to Step 10 |
| 8 | Test the signal circuit of the boost sensor for a short to ground or an open. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 13 | Go to Step 10 |
| 9 | Inspect for poor connections at the boost sensor. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 13 | Go to Step 11 |
| 10 | Inspect for poor connections at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 13 | Go to Step 12 |
| 11 | Replace the boost sensor. Refer to Boost Sensor Replacement (Federal Emissions)
or Boost Sensor Replacement (California Emissions)
. Did you complete the replacement? |
- | Go to Step 13 | - |
| 12 | Replace the ECM. Refer to Engine Control Module (ECM) Replacement
. Did you complete the replacement? |
- | Go to Step 13 | - |
| 13 |
|
- | 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 | System OK |