Circuit Description
The injection pump delivers fuel to 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. Closure time out of range is seen as a fault. This response time is measured in milli seconds.
Conditions for Setting the DTC
| • | Battery voltage greater than 11 volts and less than 15 volts. |
| • | Engine coolant temperature greater than -1°C (34°F). |
| • | Engine speed greater than 506 rpm. |
| • | Requested fuel rate is greater than 0.0 mm |
| • | Inj. Pump Closure Time less than .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 when forty consecutive warm-up cycles that the diagnostic does not fail (coolant temperature has risen 5°C (40°F) from start up coolant temperature and engine coolant temperature exceeds 71°C (160°F) that same ignition cycle. |
| • | Use of a Scan tool |
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 other DTCs, diagnose them first. If the vehicle is running close to the DTC setting closure time, vehicle should be checked during cold start ups and during hot conditions.
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.
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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 | Replace the Injection pump. Refer to Fuel Injection Pump Replacement . Important: The new injection pump must be timed. Refer to Fuel Injection Pump Timing Adjustment . Is the action complete? | -- | -- | |
11 | Replace the PCM. Important: The new PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming . 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 |
