Toro 500 EFI Service Manual page 144

Inlet Air Temperature (AIr)
Diagnostic Mode
Display: Inlet air temperature in Fahrenheit or Celsius.
DTC: P0112, P0113, P0114
Usage: Verify correct output of IAT sensor.

NOTE: After engine has been running, IAT readings
will be higher than outside air temperature due to
engine and engine compartment heat as well as
intake manifold heating.
Battery (bAtt) Diagnostic Mode
Code Fault Description
C0063 Tilt Sensor Circuit High
C0064 Tilt Sensor Circuit Low/SG/Open
P0030 O2 Heater Intermittent/Open
P0031 O2 Heater Low/SG
P0032 O2 Heater High/SP
P0107 MAP Sensor Circuit Low/SG/Open
P0108 MAP Sensor Circuit High/SP
P0112 IAT Sensor Circuit Low/SG
P0113 IAT Sensor Circuit High/Open
P0114 IAT Sensor Circuit Intermittent
P0116 ECT Sensor Circuit Range/Performance
P0117 ECT Sensor Circuit Low/SG
P0118 ECT Sensor Circuit High/Open/SP
P0119 ECT Sensor Circuit Intermittent
P0121 TPS Range/Performance
P0122 TPS Circuit Low/SG
P0123 TPS Circuit High
P0130 O2 Sensor Intermittent/Open
P0131 O2 Sensor Low/SG or Air-Leak
142
Display: System DC voltage.
DTC: P0562, P0563, P2531, P2532
Usage: Verify system voltage under following condi-
tions.
1. Battery voltage with engine and accessories off
(>12.2 VDC for fully charged).
2. Battery voltage with engine running (charging = 13.8
VDC or greater).
3. Battery voltage with electrical accessories operating,
engine idling (13.5 VDC or greater).
4. Battery voltage starter cranking (10.5-11.5 VDC).
DIAGNOSTIC TROUBLE CODES
EFI005
(DTC)
If an EFI or related chassis component fails or an out-of-
tolerance signal is detected by the ECM, a diagnostic
trouble code (DTC) will be generated in the ECM and
displayed on the LCD. The DTC will be displayed alter-
nately with a wrench icon or malfunction indicator light
(MIL). The DTC will continue to flash, until the mal-
function is corrected and the code cleared.
Code List

NOTE: Each of the following numerical codes will
have a one-letter prefix of C, P, or U. A "C" prefix
denotes a chassis malfunction, a "P" prefix denotes a
power train malfunction, and a "U" prefix denotes a
loss of communication with the gauge.

NOTE: Normal malfunction codes are cleared from
the LCD when the component is replaced or the mal-
function is corrected; however, intermittent codes
must be cleared as noted in the code chart.
EFI004
Possible Cause
Sensor or interconnect harness shorted to battery power
Sensor or interconnect harness open or shorted to chassis ground
Heater or interconnect harness intermittent or open
Heater or interconnect harness shorted to chassis ground
Heater or interconnect harness shorted to battery power
Sensor or interconnect harness shorted to chassis ground
Sensor or interconnect harness shorted to battery power
Sensor or interconnect harness shorted to chassis ground
Sensor or interconnect harness open or shorted to battery power
Sensor or interconnect harness intermittent
Sensor producing an out-of-range voltage
Sensor or interconnect harness shorted to chassis ground
Sensor or interconnect harness open or shorted to battery power
Sensor or interconnect harness intermittent
Sensor producing an out-of-range voltage
Sensor or interconnect harness shorted to chassis ground
Sensor or interconnect harness open or shorted to battery power
Sensor or interconnect harness intermittent or open
Sensor or interconnect harness shorted to chassis ground or an air-
leak exists
Fault Recovery Method
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