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Coolant (COOL) Diagnostic Mode
EFI 003
Display: Engine coolant temperature as measured by the
ECT sensor.
DTC: P0116, P0117, P0118, P0119
Usage: Monitor coolant temperature to verify the following:
1. ECT sensor signal
2. High Temperature indicator (on @ 230° F/110° C)
3. Thermostat opening @ approximately 149° F (65° C),
indicated by a momentary drop or pause in the rising
temperature reading.
4. Fan ON @ 185° F (85° C), OFF @ 176° F (80° C).
A. fan motor
B. fan relay
C. fan fuse
D. wiring connections
5. High Temperature Rev Limiter 5000 RPM @ 230° F
(110° C).
Fuel Sensor (FUEL) Diagnostic Mode
EFI010
Display: Fuel level signal from the fuel level sensor
(measured in ohms).
DTC: C1400
Usage: Check output of the fuel level sensor
1. Full fuel is indicated by a reading of 0-26 ohms
2. Empty is indicated by a reading of 100-105 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)
3. ECM (CAN) signal to EPS
Speed (SPd) Diagnostic Mode
EFI008
Display: Vehicle speed signal.
DTC: P0500
Usage: Verify speedometer sensor signal from the fol-
lowing:
1. Speed sensor to ECM.
2. ECM (CAN) signal to gauge (speedometer/odometer).
3. ECM (CAN) signal to EPS unit.
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