1994 PCED OBDI-A
SECTION 6A: EEC-IV Pinpoint Test
Procedures
HA: Adaptive Fuel
Introduction
  HA: Pinpoint Tests  

Note

You should enter this Pinpoint Test only when directed from Diagnostic Routines, Section 2A.

Adaptive Fuel

The Powertrain Control Module (PCM) uses adaptive fuel logic primarily to compensate for normal variability in fuel system components. If, during normal vehicle operation, the fuel system appears biased rich or lean, adaptive fuel will make a corresponding shift in the fuel delivery calculations to compensate and remove the bias.

 

Fuel Pressure Specification Table
 2.3L 4.9L HSC MFI SFI TRK3.0L SHO SFI3.8L SC SFIALL OTHER CAR APPLICATIONSALL OTHER TRUCK APPLICATIONS
ENGINE
RUNNING		45-60 PSI
310-415 kPa		28-33 PSI
193-227 kPa		30-40 PSI
210-280 kPa		30-45 PSI
210-310 kPa		30-45 PSI
210-310 kPa
KEY ON
ENGINE OFF		50-60 PSI
345-415 kPa		30-45 PSI
210-310 kPa		35-40 PSI
240-280 kPa		35-40 PSI
240-280 kPa		35-45 PSI
240-310 kPa



MAP/BARO Sensor Tester Table
Approximate Altitude (Ft.)Voltage Output (+/- .04 Volts)
01.59
10001.56
20001.53
30001.50
40001.47
50001.44
60001.41
70001.39

Note: Measure several known good MAP/BARO sensors on available vehicles. The measured voltage will be typical for your location on the day of testing.

 

Injector Bank Resistance
Specification Table 1 (Not For SFI)



All Engines
Values Are In Ohms
2.3L4.0L/4.9L5.0L/5.8L 7.0L/7.5L
6.0 - 8.54.0 - 5.53.0 - 4.0

 

Single Injector Resistance
Specification Table 2



All Engines
Values Are In Ohms
ALL ENGINES
11.0 - 18.0

 

 

  HA: Pinpoint Tests