120
TROUBLESHOOTING
NOTE: The EPS assembly is not serviceable and
must not be disassembled or EPS warranty will be
voided.
1. Check 30-amp EPS fuse and EPS relay (primary
coil: 150 ohms ± 10%, secondary resistance <1 ohm
with primary energized).
2. With the ignition off, disconnect 2-pin connector on
the EPS assembly and connect a volt meter set to DC
voltage to the harness (black meter lead to BLK and
red meter lead to ORG/BRN).With the ignition
switch in the ON position, the meter should read bat-
tery voltage (if correct voltage is not present, check
connections and wiring harness).
3. With ignition switch off, disconnect the 8-pin con-
nector on the EPS assembly and connect a volt meter
set to DC voltage to the harness (red meter lead to
the ORG wire and black meter lead to battery
ground.) With the ignition switch in the on position,
the meter should read battery voltage (if correct volt-
age is not present, check for loose fittings or connec-
tions in the wiring harness).
NOTE: If after completing the preceding tests and
possible solutions with normal results an EPS issue
persists with active DTCs C1301-C1305, 1316, or
C1326-C1329 confirmed by CATT II, the EPS assem-
bly must be replaced (see Steering/Body/Controls).
Ignition Switch
The ignition switch harness connects to the switch with a
four-pin connector. To access the connector, remove the
gauge; then remove the ignition switch nut, remove the
switch, and press the connector release tab. Pull the con-
nector from the switch.
XR105A
XR107A
VOLTAGE
NOTE: Perform this test on the harness connector.
1. Set the meter selector to the DC Voltage position.
2. Connect the red meter lead to either red wire; then
connect the black meter lead to ground.
3. Meter must show battery voltage.
NOTE: If the meter shows no battery voltage, trou-
bleshoot the battery or the main wiring harness.
RESISTANCE
NOTE: Perform this test on the switch using the fol-
lowing procedure.
CF274A
1. Turn the ignition switch to the ON position.
2. Set the meter selector to the OHMS position.
3. Connect either tester lead to pin C; then connect the
other tester lead to pin D.
CAUTION
Do not attempt to check resistance of the EPS motor
(2-pin input receptacle). There are internal capacitors
holding a charge that can cause internal damage to an
ohmmeter.
CAUTION
If CATT II has confirmed an active DTC relating to the
CAN communication wires, use extreme caution when
testing the wires. Do not probe the ECM connector with
meter leads; instead use a small T-pin or other suitable
testing component to make light and proper contact.
CAUTION
Never disconnect the ECM connector with the battery
cables installed onto the battery.
Summary of Contents for 2016 Alterra 500
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