Throttle Position Sensor (Tps); Efi Diagnostic System - Toro 500 EFI Service Manual

Throttle Position Sensor
(TPS)
Component data can be retrieved using the CATT II. Uti-
lize the Sensor Data screen.

NOTE: Preliminary checks may be performed on
this component using the diagnostic mode on the
LCD gauge (see EFI Diagnostic System in this sec-
tion).
TESTING
1. Remove the left-side engine cover; then disconnect
the three-wire TPS connector plug.

NOTE: Prior to testing the TPS, inspect the three-
wire plug connector on the main harness and the
three-pin plug on the TPS for contamination, broken
pins, and/or corrosion.

NOTE: If the vehicle is in warranty, removing or
adjusting the TPS will void warranty. If the TPS is
tested out of specification, the throttle body must be
replaced. If the vehicle is out of warranty, the TPS
may be adjusted.
2. Connect the TPS Multi-Analyzer Harness connector
#8 to the TPS; then connect the harness to the TPS
Analyzer Tool.
3. Using a multimeter, connect the tester to the analyzer
as shown in the table below; then select the DC Volt-
age position. With the vehicle off and throttle at idle,
the gauge should read as shown and at Wide-Open
Throttle it should read up to as shown.
Analyzer
Model Tester Lead
Socket
Black
500
Red
Black
700
Red
FI672
Idle WOT
(DC Volts) (DC Volts)
GND 0.66-0.70 3.88
VAR
VAR 0.58-0.62 3.70
+5V

NOTE: If the throttle body, ECM, TPS, or ISC are
replaced, the EFI system must be synchronized. Use
the following procedure.
1. With the key off, depress accelerator pedal to Wide
Open Throttle (WOT).
2. Place the ignition key in the ON position and wait for
10 seconds.
3. Release the accelerator pedal, and wait an additional
10 seconds.
4. Turn the key to the OFF position and allow the gauge
to shut off.

EFI Diagnostic System

DIGITAL GAUGE
The digital gauge can be used as a diagnostic tool for
many of the DTC's displayed. To place the gauge into the
diagnostic mode, use the following procedure.
1. Turn the ignition switch ON.
2. Depress and hold both Mode and Set buttons
together for approximately 10 seconds after which
the letters "dIAg" will appear on the LCD momen-
tarily followed by COOL.
500
FI673A
700
FI676A
139