Circuit Description
The injection pump delivers the fuel to the individual cylinders by opening and closing a solenoid control fuel valve. The powertrain control module (PCM) monitors the amount of time the fuel solenoid valve takes 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 Running the DTC
| • | The battery voltage is more than 10 volts and less than 16 volts. |
| • | The engine coolant temperature (ECT) is more than -1°C (34°F). |
| • | The engine speed is more than 506 RPM. |
| • | The requested fuel rate is more than 0 mm. |
Conditions for Setting the DTC
The Inj. Pump Closure Time is less than 0.75 millisecond.
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 get below 1/8 of a tank while performing hard acceleration or turning maneuvers. DTCs P0251, P0370, and P1216 may 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 performed in these conditions, bleed the 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 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 determines if the ground circuit is open which causes the vehicle not to start.
-
This step determines if the signal circuit is open or an injection pump (fuel solenoid) is malfunctioning.
Step | Action | Values | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics | ||||||||||
1 |
Important: Before clearing the DTCs, use the scan tool Capture Info to save the Freeze Frame/Failure Records for reference. The data in the control module is deleted once the Clear Info function is used. Did you perform the Diagnostic System Check-Engine Controls? | -- | Go to Step 2 | |||||||
Is the DTC P0219 also set? | -- | Go to DTC P0219 | Go to Step 3 | |||||||
Does the engine start? | -- | Go to Step 4 | Go to Step 7 | |||||||
4 |
Is the scan tool display less than or equal to the specified value? | 0.75 ms | Go to Step 5 | Go to Step 6 | ||||||
5 | With the engine running, again observe the Inj. Pump Sol. Closure Time on the scan tool. Is the Inj. Pump Closure Time display 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 any additional DTCs are stored, refer to the applicable DTC tables first. Are there any additional DTCs stored? | -- | -- | |||||||
7 |
Did you perform a repair? | -- | Go to Step 12 | Go to Step 10 | ||||||
8 |
Did you perform a repair? | -- | Go to Step 12 | Go to Step 9 | ||||||
9 | Check the closure signal circuit for a poor connection at the PCM and replace the terminal if necessary. Refer to Wiring Repairs in Wiring Systems. Did you perform a repair? | -- | 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 fuel 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 scan tool indicate the diagnostic passed? | -- | Go to Step 13 | Go to Step 2 | ||||||
13 | Does the scan tool display any additional undiagnosed DTCs? | -- | System OK | |||||||
