Manitowoc Grove 5540F Service Manual page 187

5540F/YB5515 SERVICE MANUAL
and drive-by-wire pot (if it is used and easy to disconnect). Perform the measurements below:
Meter Mode
Ohms
Ohms
Ohms
Ohms
Ohms
Ohms
If all other TPS tests check out, reconnect all sensors. Measure the voltage from TPS pin C to ground while
manually opening the throttle plate. The voltage should read >0.5 volts at closed throttle and < 4.5 volts at
wide open throttle and move smoothly between closed ad open throttle. If the voltage has "dead spots" or
spikes, replace the TPS sensor. If the voltage is within the range and moves smoothly, replace the ECM.
Code 22: The throttle body actuator is not responding; the fault is either caused by a short circuit or the actuator is
unplugged.
Code 23: The inlet air temperature reads too low. This may occur if the temperature is below -40° F (-40° C), or if the IAT
sensor is unplugged
Code 24: The air inlet temperature (IAT) reads too high. While unlikely, if this sensor is above 270° F (132° C) this code will
be sent.
To verify the inlet air temperature sensor wiring:
1. Disconnect the inlet air temperature sender (IAT) and measure the resistance. This will vary depending on
the sensors temperature. The resistance should be within 5% of that listed in the table under Code 15. If the
sensor differs, replace the sensor.
2. Turn the ignition power ON and disconnect the IAT sensor.
2.1 Measure the voltage between IAT sensor pin A (purple) and ground. This should read near 5 volts. If it
does not proceed to step 2.1.1.
2.1.1 Turn off the ignition power and disconnect the ECM
2.1.2 Measure resistance from ECM pin 19 to IAT harness pin A. It should read less than 1 ohm. If it
2.1.3 Measure resistance from ECM connector pin 10 to IAT sensor pin B (BK/YL). It should read less
2.2 If no sensor or wire problems are found, replace the ECM.
Code 31: Drive-by-wire (DBW) error (wire from foot throttle to TPS), the drive-by-wire voltage is too low or too high. This
code can be set in some systems if the drive-by-wire pot is set to one extreme or the other. First set the pot at
least 1/8 of a turn from either end. If the error code is gone, there is no problem.
To verify the DBW sensor and wiring:
1. Turn ignition power ON. Measure voltage from harness DBW ground wire (BK/YL) and supply (harness wire
RD/BL). This should measure 4.75 - 5.25 volts. If not proceed to step 1.1.
1.1 Turn off the ignition power, disconnect the DBW sensor from the harness, if possible, and disconnect
the ECM.
1.2 Measure the resistance between DBW control ground (harness wire BK/YL) and supply (harness wire
RD/BL). This should read close to the pots resistance (in the range of 1 k ohms to 10 k ohms), however
if it reads open or shorted the unit is defective.
1.3 Measure the resistance from the pots ground lead to the output lead (harness GN/YL). The resistance
should start low when the pot is turned to the low side and increase smoothly as the pot is turned to the
high side. If the resistance does not smoothly increment or has discontinuity, replace the DBW device.
GROVE
TPS Wiring Troubleshooting
From
ECM Harness 10
ECM Harness 40
ECM Harness 8
ECM Harness 10 ECM Harness 40
ECM Harness 10 ECM Harness 8
ECM Harness 40 ECM Harness 8
does not, repair the wire.
than 1 ohm. If it does not repair the wire.
Published 10-21-2010, Control# 198-04
ENGINE AND ENGINE SYSTEMS
To Desired Result
TPS A < 1 Ohm
TPS B < 1 Ohm
TPS C < 1 Ohm
Open or < 1000
Ohms if DBW pot
Open
Open
If Defective
Ground wire is open
5 volt wire is open
TPS signal wire is
open
5 volt wire is shorted
to ground
TPS signal shorted
to ground
TPS signal shorted
to +5 volts
6
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