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Fuel Sensor (FUEL) Diagnostic Mode
EFI010
Display: Fuel level signal from the fuel level sensor
(measured in ohms).
DTC: C1400, C1401, C1402
Usage: Check output of the fuel lev el sensor
1. Full fuel is indicated by a reading of 86-100 ohms
2. Empty is indicated by a reading of 0-5 ohms
* 110-500 ohms, suspect the fuel level sensor or wiring
* 0-100 ohms but no fuel gauge indication, suspect the fuel gauge
Tachometer (tACH) Diagnostic
Mode
EFI009
Display: Engine RPM
DTC: P0336, P0337, P0339
Usage: Verify engine speed signal from the following.
1. CKP (crankshaft position) sensor to ECM
2. ECM (CAN) signal to gauge (tachometer)
Speed (SPd) Diagnostic Mode
EFI008
Display: vehicle speed signal.
DTC: P0500
Usage: verify speedometer sensor signal from the following.
1. Speed sensor to ECM.
2. ECM (CAN) signal to gauge (speedometer/odometer).
TPS (tPS) Diagnostic Mode
EFI007
Display: % of TPS (0% closed, 95-100% WOT).
DTC: P0121, P0122, P0123
Usage: Verify TPS signal and adjust throttle cable.
MAP (bArO) Diagnostic Mode
EFI006
Display: MAP in millibars (1013 millibar = 29.92 in.
mercury).
DTC: P0107, P0108
Usage: Verify barometric pressure signal correct.
NOTE: Local barometric pressure is given in in./Hg
(Inches of Mercury). 34 millibars are equal to 1 inch of
mercury. Example: (Gauge reading in the BARO
mode = 974 millibars, thus 974/34 = 28.64 in./Hg). Sec-
ond example: (Local barometer reading is 29.87 in./
Hg, therefore 29.87 X 34 = 1015 millibars) The gauge
should be reading very close to 1015.
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