Circuit Description
The injection pump delivers fuel to individual cylinders by opening and closing a solenoid control fuel valve. The powertrain control module (PCM) monitors the amount of time needed for the fuel solenoid valve to physically close after commanded to close. Command time out of range is seen as a fault. This response time is measured in milliseconds.
Conditions for Running the DTC
| • | The battery voltage is greater than 12 volts and less than 15 volts. |
| • | The engine coolant temperature (ECT) is greater than 50°C (122°F). |
| • | The engine speed is greater than 1,350 RPM. |
| • | The requested fuel rate is greater than 0.0 mm. |
Conditions for Setting the DTC
| • | The injection pump command time is less than 0.75 ms. |
| • | All diagnostic set conditions met for 2 seconds. |
Action Taken When the DTC Sets
| • | The control module stores the DTC information into memory when the diagnostic runs and fails. |
| • | The malfunction indicator lamp (MIL) will not illuminate. |
| • | The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records. |
| • | The driver information center, if equipped, may display a message. |
Conditions for Clearing the DTC
| • | A current DTC Last Test Failed clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic. |
| • | Clear the DTC with a scan tool. |
Diagnostic Aids
Intermittent DTCs P0251, P0370 and P1216 may be caused by air entering the fuel system when fuel levels fall below 1/8 of a tank while performing hard acceleration or turning maneuvers. It is also possible that a DTC P0251, P0370 and P1216 will set if the vehicle has run out of fuel. Customer driving habits should be checked to determine if the vehicle has been performing in these manners. If the vehicle has been performing in these conditions, bleed the fuel system of all air and test drive the vehicle.
When the PCM is in backup fuel, fast idle and poor performance problems will exist. If DTC P0251 is also stored, the Snapshot mode on the scan tool should be used to properly identify the fault. DTCs P0335, P1216, and P1217 may set along with this DTC.
If DTC P1216 is set with any other DTCs, diagnose them first. If the vehicle is running close to the DTC setting closure time, the vehicle should be checked during cold start- ups and during hot conditions.
An intermittent can be caused by the following conditions:
| • | Poor connections |
| • | Rubbed through wire insulation |
| • | Broken wire inside the insulation |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step will determine if the ground circuit is open which causes the vehicle not to start.
-
This step will determine if the signal circuit is open or an injection pump (fuel solenoid) is at fault.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics | ||||
1 | Did you perform the Diagnostic System Check-Engine Controls? | -- | Go to Step 2 | |
Is DTC P0219 also set? | -- | Go to DTC P0219 | Go to Step 3 | |
Will the engine start? | -- | Go to Step 4 | Go to Step 7 | |
4 |
Does the scan tool display measure less than or equal to the specified value? | 0.75 ms | Go to Step 5 | Go to Step 6 |
5 |
Does the Injection Pump command display measure less than or equal to the specified value? | 0.1 ms | Go to Step 8 | Go to Step 10 |
6 | The DTC is intermittent. If no additional DTCs are stored, refer to Diagnostic Aids. If additional DTCs were stored refer to those applicable DTC tables first. Are any additional DTCs stored? | -- | -- | |
7 |
Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 10 |
8 |
Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 9 |
9 | Check the closure signal circuit for a proper connection at the PCM and replace the terminal if necessary. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 11 |
10 |
Important: The new injection pump must be timed. Refer to Fuel Injection Pump Timing Adjustment . Replace the Injection pump. Refer to Fuel Injection Pump Replacement . Did you complete the replacement? | -- | Go to Step 12 | -- |
11 | Replace the PCM. Refer to Powertrain Control Module Replacement . Did you complete the replacement? | -- | Go to Step 12 | |
12 |
Does the DTC run and pass? | -- | Go to Step 13 | Go to Step 2 |
13 | With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK | |
