Technical Service Bulletins
|Publication Date: JUNE 26, 2001|
1998-1999 F-250 LD
1998-2001 E-250, E-350, F-150
This article can be used as an overview of Bi-Fuel CNG vehicle Parameter Identification Data (PID), inputs and outputs as a diagnostic aid for the listed Bi-Fuel vehicles.
Refer to the Parameter Identification Data (PID) Input And Output Information Chart as an aid for diagnostics and the Switch-Over Code Chart for additional information.
Refer to the PID Information table and PID Input/Output diagram (Figure 1) as an aid for diagnostics.
|PID INPUT AND OUTPUT INFORMATION|
|PID Sensor/ Input||PID State – KOEO||PID State – Hot Idle in Alt Fuel||PID – Units|
|ADPTCTL||0.0||1.00 +/- 0.30 equivalent to long term fuel trim|
|ALTRFUN||Counts up for total run time on alt fuel||Counts up for total run time on alt fuel||hours|
|BAROHRE||13.5 to 15.0|
NOTE: This will vary according to local altitude and weather conditions.
|13.5 to 15.0||psi|
|CL-COR||0.0||0.70 to 1.30||#|
|DELTMAP||0.0||– 7.5 to +7.5 (+ reading indicates that the throttle is opening and MAP is increasing, – reading indicates the reverse)||psi|
|ECT||-38 to 254||175 to 254 (from PCM)||degrees F|
NOTE: Calculated EGR Flow. Will increase with increased EGR.
|FRPREAB||12 to 150 psia|
NOTE: The minimum pressure to start on the alternative fuel is 96 psia for CNG. The minimum reading for a functional sensor with the inlet hose disconnected would be the same as BAROHRE.
|75 to 130 psia|
NOTE: Once the engine has started in Alt Fuel, it will continue to run until readings drop below 75 psia for F-Series CNG or 45 psia for Contour. Below this, the engine will auto-switch to gasoline.
|FRTMPAB||-79 to 260||-79 to 260 |
NOTE: Will vary dependent on ambient temperature, engine temperature, fuel temperature and fuel demand.
|FTP (F-Series, E-Series)||0-3600||0-3600||psi|
|FTTMP||-40 to 248||degrees F|
|FUEL-MD||01, 03||01, gasoline, 02, in transition from Alt to Gasoline, 03, Alt Fuel||#|
|GASFRUN||0 to 65535||Counts up for total run time on gasoline||hours|
|IAT||-38 to 254||Varies according to ambient air temperature and underhood temperatures (from PCM).||degrees F|
|MAF||0.0||4.8 to 8.2||lbs/min|
NOTE: KOEO, MAP reading should equal BAROHRE reading.
|3 to 7 |
NOTE: Will vary according to engine speed and load.
|MIX-TMP||Ambient||-40 to 215||degrees F|
|O2S11||0.0||0.1 to 0.9||volts|
|O2S21||0.0||0.1 to 0.9||volts|
|RPM||0||650 to 950 at idle|
|RUNTIME||0||0 to 65535 (counts up from last start)||seconds|
|VBAT||12 (batt volt)||11.5 to 15.0 |
NOTE: This is the voltage as seen by the AFCM.
|VOL-EFF||0.0||0.0 to 1.50||%|
|CAUSE||00, 02, 03, 06, 07, 08||00, 02, 03, 06, 07, 08 |
NOTE: Indicated switch-over cause. 00 = no switch-over requested. See following switch-over chart for complete list.
|CCNT||0 to 29||Number of DTCs stored|
|GAS FPR||OFF/ON||Off when running on Alt Fuel, On when running on gasoline||NOTE: May not respond.|
|MFDES||0.00||Desired Mass Flow of Fuel. This will vary according to engine speed and load.||lbs/min|
|SPRKADD||0.0||# of degrees requested beyond normal PCM timing advance.||degrees|
|VLV #1||CLOSED||OPEN/CLOSED||Injector Status|
|VLV #2||CLOSED||CLOSED||Injector Status|
|VLV #3||CLOSED||CLOSED||Injector Status|
|VLV #4||CLOSED||CLOSED||Injector Status|
|VLV #5||CLOSED||CLOSED||Injector Status|
|VLV #6||CLOSED||CLOSED||Injector Status|
|SWITCH-OVER CODE CHART|
|Code #||Switch-Over Cause||Description|
|00||No switch-over requested||On key on, Alt fuel has been selected and there is sufficient fuel to start and run on Alt Fuel.|
|02||Low fuel absolute pressure||While running on Alt Fuel, the pressure dropped below the minimum to run on Alt Fuel, resulting in a switch to gasoline.|
|03||Requested by VCL||VCL was unable to communicate with EEC to request Alt Fuel, therefore, switch to gas.|
|06||Fuel absolute pressure time out||FAP did not reach the minimum level within time limit on key up. Most likely cause, out of fuel before starting.|
|07||Stall after auto-switch||After auto-switching to gasoline, the engine has stalled. Therefore, if the engine is cranked without switching off the key, start on gasoline.|
|08||No VCL communication||The Compuvalve could not communicate with the VCL or VCLD.|
OTHER APPLICABLE ARTICLES:
490000, 602300, 603300, 608000, 609000, 611000, 623000, 690000, 698298
Figure 1 – Article 01-13-6