80
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.
2. With the ignition off, disconnect the two-wire EPS
power 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 posi-
tion, the meter should read battery voltage (if correct
voltage is not present, check connections and wiring
harness).
3. With ignition switch off, disconnect the three-wire
connector 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 confirmed by the Dealer
Diagnostic Service, the EPS assembly must be
replaced (see Steering/Body/Controls).
Ignition Switch
The ignition switch, dash switches, front accessory con-
nectors, and front switched accessory connector can be
accessed from under the dash.
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 the red wire; then con-
nect the black meter lead to battery ground.
3. Meter must show battery voltage.
NOTE: If the meter shows no battery voltage, trou-
bleshoot the main 30-amp fuse, the battery, or the
main wiring harness.
4. Connect the red meter lead to the brown/black wire;
then with the black lead grounded, turn the ignition
switch to the ON position. The meter must show bat-
tery voltage.
5. Connect the red meter lead to the yellow/green wire;
then with the black lead grounded, depress the brake,
and turn the ignition switch to the START position.
The starter should engage and the meter must show
battery voltage.
NOTE: When the starter is engaged, battery voltage
will be approximately 10.5 DC volts.
Ignition Coils
The ignition coils (A) are attached to the valve cover with
two fasteners per ignition coil.
WT405
RESISTANCE
NOTE: The following test should be made using
MaxiClips and the Fluke Model 77 Multimeter set to
OHMS scale.
1. Disconnect an ignition coil connector.
2. Connect the red tester lead to one coil terminal; then
connect the black tester lead to the other coil termi-
nal. Primary coil resistance must be 1.19-1.61 ohms.
CAUTION
Do not attempt to check resistance of the EPS motor. There
are internal capacitors holding a charge that can cause
internal damage to an ohmmeter.
CAUTION
If the Dealer Diagnostic Service 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.
CAUTION
Always disconnect the battery when performing resis-
tance tests to avoid damaging the multimeter.
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