
84 RENR5622
Troubleshooting Section
Repair: If an intermittent condition is suspected,
refer to Troubl
eshooting, “Inspecting Electrical
Connectors”.
STOP.
•
Not OK - Keyswitch voltage out of range – Proceed
to Test Step 4.
•
Not OK – The voltage is not ± 1 VDC from the
voltage at the
battery terminals. The voltage is not
correctattheECM.
Repair: Ther
e is an open circuit or excessive
resistance in the wiring or connections between
the batteries and the ECM. Verify that the circuit
breaker for t
he ECM is not tripped. Verify that the
battery disconnect switch is in the ON position.
Verify that the connection for the engine ground is
clean and ti
ght. Repair the connectors or wiring
and/or replace the connectors or wiring.
STOP.
Test Step 4. Check the Voltage from the
Keyswitch to the M ain Power Relay
A. Turn the keyswitch to the OFF position.
B. Remove the
wire from the terminal R of the
keyswitch.
C. Turn the ke
yswitch to the ON position.
D. Measure the voltage on terminal B of the
keyswitch
to engine ground.
E. Measure the voltage on terminal R of the
keyswitch
to engine ground.
F. Turn the keyswitch to the OFF position.
Expected Result:
Voltage is
present on terminal B and terminal R at
the keyswitch.
Results:
•
OK – Voltage is present on terminal B and terminal
Rattheke
yswitch. Proceed to Test Step 5.
•
Not OK – Voltage is not present on terminal B at
the keysw
itch.
Repair: If voltage is not present on terminal B,
repair th
ewirebetweenthe+Batteryandthe
keyswitch. Verify that the breaker for the keyswitch
is not tripped. Verify that the problem is eliminated.
STOP.
•
Not OK – Voltage is not present on terminal R at
the keyswitch.
Repair: If voltage is present on terminal B of the
keyswitch but
not present on terminal R, replace
the keyswitch. Return all wiring to the original
configuration. V erify that the problem is eliminated.
STOP.
Test Step 5. Ch
eck the Voltage at the
Main Power Re
lay
A. Remove wire 112-PU from the main power relay.
B. Turn the keyswitch to the ON position.
C. Measure the v
oltage between engine ground and
the following test points at the main power relay.
Table 29
Test Point
Terminal for wire 112-PU
Wire 109-OR
Wire 308-YL
D. Turn the keyswitch to the OFF position.
Expected Result:
The voltage measures 24 ± 3 VDC between each of
the test points and engine ground.
Results:
•
OK –Thevoltagemeasures24±3VDCbetween
each of the test points and engine ground.
Repair: Verify that the “VIMS Breaker” is not
tripped. Repair the wiring and/or connectors
between the main power relay and the “VIMS
Breaker”. Repair the wiring and/or connectors
between the “VIMS Breaker” and the ECM.
STOP.
•
Not OK – The voltage does not measure 24 ± 3
VDC between the terminal for wire 112-PU and
engine ground.
Repair: If voltage is present at the other two
test points, check the wire 200-BK for continuity
betweenenginegroundandthemainpowerrelay.
If wire 200-BK is OK, replace the main power relay.
STOP.
•
Not OK – The voltage does not measure 24 ± 3
VDC between wire 109-OR and engine ground.