Dodge RAM TRUCK 1500 1995 Service Manual page 1147

mm — GENERAL DIAGNOSIS—EXCEPT DIESEL 14 - 65
BOTTOM VIEW
OF RELAY
RELAY
CONNECTOR
85 30
86
87 87A
DE-ENERGIZED
RELAY
Fig. 43 Re
• Terminal number 87 is connected (a circuit is
formed) to terminal 30 in the energized (ON) posi­
tion. Terminal number 87 then supplies battery volt­
age to the component being operated.
• Terminal number 86 is connected to a switched (+)
power source.
• Terminal number 85 is grounded by the power-
train control module (PCM).
TESTING
(1) Remove relay before testing.
(2) Using an ohmmeter, perform a resistance test
between terminals 85 and 86. Resistance value
(ohms) should be 75 ±5 ohms for resistor equipped
relays.
(3) Connect the ohmmeter between terminals num­
ber 87A and 30. Continuity should be present at this
time.
(4) Connect the ohmmeter between terminals num­
ber 87 and 30. Continuity should not be present at
this time.
(5) Use a set of jumper wires (16 gauge or small­
er). Connect one jumper wire between terminal num­
ber 85 (on the relay) to the ground side (-) of a 12
Volt power source.
(6) Attach the other jumper wire to the positive
side (+) of a 12V power source. Do not connect this
jumper wire to relay at this time.
85 30
86
87 87A
ENERGIZED
Terminals
CAUTION:. Do not allow the ohmmeter to contact
terminals 85 or 86 during these tests. Damage to
ohmmeter may result.
(7) Attach the other jumper wire (12V +) to termi­
nal number 86. This will activate the relay. Continu­
ity should now be present between terminals number
87 and 30. Continuity should not be present between
terminals number 87A and 30.
(8) Disconnect jumper wires from relay and 12 Volt
power source.
If continuity or resistance tests did not pass, re­
place relay. If tests passed, refer to Group 8W, Wiring
Diagrams for (fuel system) relay wiring schematics
and for additional circuit information.
STARTER 10T0R RELAY TEST
Refer to Group 8A, Battery/Starting/Charging Sys­
tem Diagnostics, for starter motor relay testing.
POWERTRAIN CONTROL MODULE TESTING
Operation of the powertrain control module (PCM)
is tested with the DRB scan tool. Refer to the appro­
priate Powertrain Diagnostic Procedures service
manual for tests.