GM Service Manual Online
For 1990-2009 cars only

Object Number: 226918  Size: MF
Engine Controls Components
Engine Controls (Cell 22: Fuel Controls 2)
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice

Circuit Description

The injection pump delivers 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. Any closure time that is out of range is seen as a fault. This response time is measured in milli seconds.

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 closure time is greater than 2.5 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

A weak (mechanical failure) fuel solenoid will result in a DTC P1217. If DTC P1217 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.

Poor performance and starting conditions will exist. Fuel contamination could also cause this DTC.

Test Description

The numbers below refer to the step numbers on the Diagnostic Table.

  1. This step determines if DTC P1217 is a hard failure or an intermittent.

  2. This step will determine if the solenoid is malfunctioning, or if there is a problem with the PCM or wiring.

Step

Action

Value(s)

Yes

No

1

Important: Before clearing the DTCs, use the Scan Tool Capture Info in order to record the Freeze Frame and the failure records for reference, as the data will be lost when the Clear Info function is used.

Was the Powertrain On-Board Diagnostic (OBD) System Check performed?

--

Go to Step 2

Go to A Powertrain On Board Diagnostic (OBD) System Check

2

Is DTC P0370 set?

--

Go to DTC P0370 Timing Reference High Resolution System Performance

Go to Step 3

3

  1. Start the engine.
  2. Allow the engine to idle at the normal operating temperature.
  3. Observe the Inj. Pump Sol. Closure Time display on the Scan Tool.

Is the Scan Tool display greater than the specified value?

2.4 ms

Go to Step 4

Go to Step 5

4

  1. All of the accessories on (includes aftermarket add-ons).
  2. The engine is idling.
  3. All of the post glow plug cycles are completed
  4. With a J 39200 connected to ground, measure the voltage at the fuel solenoid driver ignition feed circuit in the U/H relay center.

Is the voltage between the specified value?

11 - 16V

Go to Step 7

Go to Step 6

5

The DTC is intermittent. If no additional DTCs are stored, refer to Diagnostic Aids. If the additional DTCs were stored, refer to those DTC tables first.

Are the additional DTCs stored?

--

Go to the applicable DTC table

Go to Diagnostic Aids

6

Repair the fuel solenoid driver ignition feed circuit poor connections or aftermarket add-ons. Refer to

Notice: Connect any add-on electrically operated equipment to the vehicle's electrical system at the battery (power and ground) in order to prevent damage to the vehicle.

.

Is the action complete?

--

Go to Step 8

--

7

Important: Before replacing the Injection pump, check the fuel system for contamination. Refer to Contamination Testing .

Replace the Injection pump. Refer to Fuel Injection Pump Replacement .

Important: The new injection pump must be timed. Refer to Injection Timing Adjustment .

Is the action complete?

--

Go to Step 8

--

8

  1. Use the Scan Tool in order to select DTC, Clear Info.
  2. Start the engine.
  3. Allow the engine to idle at the normal operating temperature.
  4. Select DTC, Specific, then enter the DTC number which was set.
  5. Operate the vehicle until the Scan Tool indicates that the diagnostic Ran.

Does the Scan Tool indicate that this diagnostic Passed?

--

Go to Step 9

Go to Step 2

9

Use the Scan Tool in order to select Capture Info, Review Info.

Are there any DTCs displayed that have not been diagnosed?

--

Go to the applicable DTC table

System OK