Section 05 ELECTRICAL SYSTEM
Subsection 02 (POWER DISTRIBUTION)
– Check the ECM fuse in FB2.
– Check the GAUGE fuse in FB1.
If you cannot feel the power relay activating when
pressing the START button, or if you suspect that
it does not function correctly, refer to
POWER RE-
LAY
in this subsection.
PROCEDURES
POWER RELAY
The power relay is a plug-in type that may be in-
verted by 180° at installation and still function cor-
rectly.
If the power relay operation is suspected, try a
known good relay before carrying out other tests.
If the replacement relay does not function, refer
to
POWER RELAY INPUT VOLTAGE TEST
.
If you do not have a replacement relay, refer to
POWER RELAY CONTINUITY TEST
.
Power Relay Input Voltage Test
1. Remove the power relay from the fuse box.
2. Set multimeter to Vdc.
3. Probe fuse box as per following table.
RELAY INPUT VOLTAGE TEST
FUSE BOX PIN
VOLTAGE
A12 to battery ground (coil)
Battery voltage
B12 to battery ground
(main contact)
Battery voltage
If battery voltage is not read at A12, check the fol-
lowing items in FB2:
– Fuse 17 (30 A BATT.).
– Wiring/connectors from battery to pin FB2-A1.
– 12 Vdc Bus bar connecting B1 through B8 for
proper contact.
– Wire jumper A2 to B2 (behind fuse box).
– Wire jumper B8 to A12 (behind fuse box).
If battery voltage is read at A12 and B12, refer to
POWER RELAY GROUND CIRCUIT CONTINUITY
.
If voltage is read at contact A12 but not at B12,
check fuse box jumper between B12 and B7.
Power Relay Output Voltage Test
The power relay output voltage is applied to the
short bus-bar in FB1.
To check for relay output voltage, slightly lift the
short bus-bar in FB1 and test for battery voltage
at a bus-bar contact.
If no voltage is measured, test the wire jumper
between FB1-D6 and FB2-A10.
Also test for a voltage drop across the power relay
main contact between the long bus-bar in FB2-B7
and FB1-D6. If a voltage drop is measured, the
relay power contact or wire jumper connections
may be bad. Refer to
POWER RELAY CONTINU-
ITY TEST
in this subsection.
Power Relay Ground Circuit Continuity
Test
Test continuity of wire between FB2-B10 and
ECM connector pin B-H2. This wire provides the
ground to the power relay from the ECM.
If the relay, relay power and ground circuits test
good, refer to
STARTING SYSTEM
. The START
switch circuit may not be powering the ECM.
If the START switch and its circuit test good, then
refer to
ELECTRONIC FUEL INJECTION
as the
ECM may not be providing the ground for the
relay to close.
Power Relay Continuity Test
To test the power relay, carry out the following.
1. Remove the relay from the fuse box.
2. Use the
FLUKE 115 MULTIMETER (P/N 529 035
868)
, and select the
position.
3. Probe relay as per following table.
TERMINAL
RESISTANCE
30
87
Open circuit (OL)
smr2007-027-050_a
4. Connect a 12 Vdc battery as in following illus-
tration and probe relay again.
smr2009-049
287
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