Genie Z-45/25 Service Manual page 114

Section 5 • Troubleshooting Flow Charts
FAULT CODES
Fault
Code
Intake Air Temperature
35
(IAT) sensor high voltage.
41 Fuel pump high voltage.
Heated Oxygen (HO
42
sensor high voltage.
Engine Coolant
43 Temperature (ECT)
sensor low voltage.
Intake Air Temperature
45
(IAT) sensor low voltage.
51 Low oil pressure.
5 - 4
Problem
IAT sensor signal is greater
than or equal to
4.93V DC for at least 3
seconds.
Fuel pump is receiving voltage
when the ECM is not sending
the signal to the fuel pump to
turn ON.
A leaking or malfunctioning fuel
injector, misfiring cylinder, faulty
TP sensor or contamination
from fuel OR use of improper
2 )
thread sealant on sensor
threads OR sensor wires
shorted to ground or poor
terminal connections OR HO
sensor is bad.
ECM detects a excessively low
signal voltage from the ECT
sensor.
ECM detects a excessively low
signal voltage from the IAT
sensor.
Bad oil pressure switch, wires
shorted to ground or not
enough engine oil.
Genie Z-45/25 & Genie Z-45/25J
Cause
Check for poor terminal
connections or shorted wires
from the IAT sensor to the ECM
to ground OR replace IAT
sensor.
Test the fuel pump relay, see the
Repair Section OR check for
poor terminal connections from
the fuel pump relay to fuel pump
OR replace the ECM.
Test for a leaking or
malfunctioning fuel injector,
misfiring cylinder or bad TP
sensor. Remove HO
check condition of sensor for
contamination OR check for poor
terminal connections or shorted
wires from the HO
2
ECM to ground OR replace HO
sensor.
Check engine coolant level OR
check for shorted wires or poor
terminal connections from the
ECT sensor to the ECM OR
replace the ECT sensor.
The IAT sensor shares the same
ground wire as the ECT and
MAP sensors. Check for shorted
wires or poor terminal
connections from the IAT sensor
to the ECT and MAP sensors to
the ECM OR replace the IAT
sensor.
Check engine oil level OR check
for shorted wires or poor
terminal connections from the oil
pressure switch to the ECM OR
replace the oil pressure switch.
First Edition • Second Printing
Solution
2 sensor and
2
sensor to the
Part No. 52709
2