DTC P1218 Injection Pump Calibration Circuit. Chevrolet Chevy P32 RV/Van Chassis 1999

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 1999 🢒 Chevy P32 RV/Van Chassis 🢒 DTC 🢒 DTC P1218 Injection Pump Calibration Circuit

Engine Controls Components
Cell 22: Engine Shutoff Solenoid, Fuel Solenoid Driver
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.

Conditions for Running the DTC

The ignition switch in the on position.

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 PCM illuminates the malfunction indicator lamp (MIL) on the second consecutive drive trip the diagnostic runs and fails.

•

The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the Failure Records store this information. If the diagnostic reports a failure on the second consecutive drive trip, the Freeze Frame records the operating conditions at the time of failure and updates the Failure Records.

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 engine warm up cycles, if this or any other emmision related diagnosic does not report any failures.

•	Use of a scan tool will clear the DTC codes.

Diagnostic Aids

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

Test Description

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 malfunctioning injection pump. This DTC will only clear DTC Status when a Time Set procedure has been activated (injection timing does not have to be adjusted).

Step	Action	Value(s)	Yes	No
1	Important: Before clearing the DTCs, use the scan tool Capture Info to save Freeze Frame and Failure Records for reference. The control module's data is deleted once the Clear Info function is used. Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?	--	Go to Step 2	Go to Powertrain On Board Diagnostic (OBD) System Check
2	Are there 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 cycle the ignition. Start and idle the engine. Activate the Time set procedure (the diagnostic will only run when a Time Set procedure is performed). Exit out of the Time set procedure and Select DTC, Specific, then enter the DTC number. Does the Scan Tool indicate that the diagnostic Passed?	--	Go to Step 5	Go to Step 4
4	Important: The new injection pump must be timed. Refer to Fuel Injection Pump Timing Adjustment . Replace the Injection pump. Refer to Fuel Injection Pump Replacement . Is the action complete?	--	Go to Step 6	--
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 DTC(s) stored?	--	Go to the applicable DTC table	Go to Diagnostic Aids
6	Does the scan tool display any additional undiagnosed DTCs?	--	Go to the applicable DTC table	System OK