DTC P1218 Injection Pump Calibration Circuit. GMC Truck Savana 1997

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1997 🢒 Savana 🢒 DTC 🢒 DTC P1218 Injection Pump Calibration Circuit

Engine Controls Components
Fuel Controls
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice

Circuit Description

The PCM uses a calibrated resistor which is mounted internally in the injection pump in order to determine the fuel rates. The resistor value is stored in the PCM memory. If the PCM memory has been disturbed or the PCM has been replaced, the PCM will relearn the resistor value on the next ignition cycle. This is a type B DTC.

Conditions for Setting the DTC

•	The PCM currently does not have a valid resistor valve.

•	The PCM is unable to read a resistor value.

Action Taken When the DTC Sets

The lowest fuel table. A possible poor performance problem.

Conditions for Clearing the MIL/DTC

•	The PCM will turn the MIL off after three consecutive trips without a fault condition.

•	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

Check the connection at fuel injector driver. Clear the DTC, and the cycle ignition. If the DTC clears, treat the condition as an intermittent.

Test Description

The number(s) below refer to the Step number(s) on the Diagnostic Table.

This Step will determine if there is a problem with the connection at the fuel solenoid driver or a malfunctioning injection pump.

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 Powertrain On Board Diagnostic (OBD) System Check
2	Are than any other DTCs set?	--	Refer to Applicable DTC Table	Go to Step 3
3	Check the connection at the Fuel Solenoid Driver. Clear the DTC and the cycle ignition. Start and idle engine. Activate Time set procedure (the diagnostic will only run when a Time Set procedure is performed). Exit out of Time set procedure and Select DTC, Specific, then enter the DTC number. Does the Scan Tool indicate that this diagnostic Ran and Passed?	--	Go to Step 5	Go to Step 4
4	Replace the injection pump. Refer to Fuel Injection Pump Replacement . Is the action complete?	--	Go to Step 5	--
5	The DTC is intermittent. If no additional DTCs are stored, refer to Diagnostic Aids. If additional DTCs were stored, refer to those table(s). Are any additional DTCs stored?	--	Go to the Applicable DTC Table	Go to Diagnostic Aids
6	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