GROVE Published 10-21-2010, Control# 198-04 6-19
5540F/YB5515 SERVICE MANUAL ENGINE AND ENGINE SYSTEMS
and drive-by-wire pot (if it is used and easy to disconnect). Perform the measurements below:
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
does not, repair the wire.
2.1.3 Measure resistance from ECM connector pin 10 to IAT sensor pin B (BK/YL). It should read less
than 1 ohm. If it does not repair the wire.
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.
TPS Wiring Troubleshooting
Meter Mode From To Desired Result If Defective
Ohms ECM Harness 10 TPS A < 1 Ohm Ground wire is open
Ohms ECM Harness 40 TPS B < 1 Ohm 5 volt wire is open
Ohms ECM Harness 8 TPS C < 1 Ohm
TPS signal wire is
open
Ohms ECM Harness 10 ECM Harness 40
Open or < 1000
Ohms if DBW pot
5 volt wire is shorted
to ground
Ohms ECM Harness 10 ECM Harness 8 Open
TPS signal shorted
to ground
Ohms ECM Harness 40 ECM Harness 8 Open
TPS signal shorted
to +5 volts
Reference Only
To Next Page
Loading...
Need help?
General
