*Fan Schedule: Left fan ON @ 185° F, OFF @ 175° F; Right fan ON @
195° F, OFF @ 185° F.
*High Temperature REV Limiter 5000 RPM @ 230° F.
*Thermostat opens @ approximately 180° F noted by a 2-5 degree drop
momentarily.
Coolant (COOL) Diagnostic Mode
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.)
3. Thermostat opening @ approximately 180° F, indi-
cated by a momentary drop or pause in the rising
temperature reading.
4. Left fan ON @ 185° F, OFF @ 175° F; right fan ON
@ 195° F, OFF @ 185° F.
A. fan motor
B. fan relay
C. fan fuse
D. wiring connections
5. High Temperature Rev Limiter 5000 RPM @ 230° F.
Fuel Sensor (FUEL) Diagnostic Mode
EFI032
Display: Fuel level signal from the fuel level sensor
(measured in ohms).
DTC: C1400, C1401, C1402
Usage: Check output of the fuel level 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
EFI032
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
EFI031
EFI030
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