Circuit Description
The injection pump delivers the fuel to the individual cylinders by opening and closing a solenoid control fuel valve. The PCM monitors the amount of time it takes for the fuel solenoid valve to physically close after commanded to close. The closure time out of range is seen as a fault. This response time is measured in milliseconds.
Conditions for Setting the DTC
| • | The battery voltage is greater than 10 volts and less than 16 volts. |
| • | The engine coolant temperature is greater than -1°C (34°F). |
| • | The ENGINE SPEED is greater than 506 RPM. |
| • | The requested fuel rate is greater than 0.0 mm. |
| • | The Inj. Pump Closure Time is less than 0.75 ms. |
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 stores in the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | A History DTC will clear after forty consecutive warm-up cycles during which the diagnostic does not fail (the coolant temperature has risen 5°C (40°F) from the start up coolant temperature and the engine coolant temperature exceeds 71°C (160°F) during that same ignition cycle). |
| • | Use of a scan tool will clear the DTC codes. |
Diagnostic Aids
Intermittent DTCs (P0251, P0370 and P1216) may be caused by air entering the fuel system when fuel levels get below 1/8 of a tank while performing hard acceleration or turning maneuvers. Its also possible that a P0251, P0370 and P1216 will set if vehicle has run out of fuel. Customer driving habits should be checked to determine if vehicle has been performing in these manners. If it has been determine that the vehicle has been performing in these conditions, bleed fuel system of all air and test drive vehicle.
If DTC P1216 is set with any of the other DTCs, diagnose those DTCs first. If the vehicle is running close to the DTC setting closure time, the vehicle should be checked during the cold start ups and during hot conditions.
An intermittent may be caused by the following:
| • | Poor connections |
| • | Rubbed through wire insulation |
| • | Broken wire inside the insulation |
Test Description
The number(s) below refer to the Step number(s) 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 malfunctioning.
Step | Action | Value(s) | Yes | No |
1 |
Important: Before clearing any DTCs, use the Scan Tool Capture Info to save freeze frame and failure records for reference, as the Scan Tool loses data when using the Clear Info function. Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||
Is the DTC P0219 also set? | -- | |||
Will the engine start? | -- | |||
4 |
Is the Scan Tool display less than or equal to the specified value? | 0.75 ms | ||
5 |
Is the Inj. Pump Closure Time display less than or equal to the specified value? | 0.1 ms | ||
6 | The DTC is intermittent. If no additional DTCs are stored, refer to Diagnostic Aids. If any additional DTCs were stored, refer to those applicable DTC table(s) first. Are there any additional DTCs stored? | -- | Go to the Applicable DTC Table | -- |
7 |
Was a repair performed? | -- | ||
8 |
Was a repair performed? | -- | ||
9 | Check the Closure signal circuit for a poor connection at the PCM and replace the terminal if necessary. Did the terminal require a replacement? | -- | ||
10 |
Important: The new injection pump must be timed. Refer to Fuel Injection Pump Timing Adjustment . Replace the fuel injection pump. Refer to Fuel Injection Pump Replacement . Is the action complete? | -- | -- | |
11 |
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 |
