The ignition relay is a normally open relay. The relay armature is held in the
open position by spring tension. When the ignition switch is turned to the run or
start position, current will flow through the relay coil. A wire connected to the
other end of the relay coil completes the path to ground. The electromagnetic field
created by the relay coil overcomes the spring tension and pulls the armature contact
into the stationary contact of the relay load circuit. The closed relay contacts allows
current to flow from the battery to the following fuses:
When the ignition switch is turned to the OFF position, the electromagnetic
field collapses. This action allows the spring tension to move the armature contact
away from the relay load circuit contacts, which interrupts current flow to the fuses.
If the ignition relay fails to close, the engine will crank, but will not run.
The class 2 communications will be available with the use of a scan tool.
The ignition relay table assumes that the vehicle battery is fully charged.
Refer to
Battery Inspection/Test
in Engine
Electrical.
Step
| Action
| Yes
| No
|
Schematic Reference:
Power Distribution Schematics
and
Ground Distribution Schematics
in Wiring Systems and
Engine Controls Schematics
Connector End View Reference:
Engine Controls Component Views
or
Powertrain Control Module Connector End Views
|
1
| Did you perform the Diagnostic System Check-Engine Controls?
| Go to
Step 2
| Go to
Diagnostic System Check - Engine Controls
|
2
|
- Turn ON the ignition, with the engine OFF.
- Remove the underhood fuse block cover.
- Probe the following fuses with a test lamp that is connected to a good
ground:
Does the test lamp illuminate on at least one test point of each fuse?
| Go to
Step 3
| Go to
Step 10
|
3
|
- Turn OFF the ignition.
- Probe both test points of the ETC fuse with a test lamp that is connected
to a good ground. Refer to
Probing Electrical Connectors
and
Troubleshooting with a Test Lamp
in Wiring Systems.
Does the test lamp illuminate on either test point of the fuse?
| Go to
Step 4
| Go to
Step 35
|
4
|
- Turn OFF the ignition.
- Remove the ignition relay from the underhood fuse block with the J 43244
Relay Puller Pliers. Refer
to
Relay Replacement
in Wiring Systems.
Notice: Refer to Test Probe Notice in the Preface section. - Probe the ignition 1 voltage circuit of the ignition relay at the underhood
fuse block with a test lamp that is connected to a good ground. Refer to
Probing Electrical Connectors
and
Troubleshooting with a Test Lamp
in Wiring Systems.
Does the test lamp illuminate?
| Go to
Step 7
| Go to
Step 5
|
5
|
- Turn OFF the ignition.
- Remove the following fuses from the underhood fuse block:
- Probe the above fuse terminals in the underhood fuse block with a test
lamp that is connected to a good ground. Refer to
Probing Electrical Connectors
and
Troubleshooting with a Test Lamp
in Wiring Systems.
Does the test lamp illuminate at any of the fuse terminals?
| Go to
Step 6
| Go to
Step 32
|
6
| Test the relay load bus bar circuit of the underhood fuse block between the
ignition relay and the following fuses for a short to battery positive voltage:
Did you find a condition?
| Go to
Step 34
| Go to
Diagnostic System Check - Engine Electrical
in Engine Electrical
|
7
|
- Turn OFF the ignition.
- Disconnect the ignition switch electrical connector.
- Connect a 20-amp fused jumper wire from the battery positive voltage terminal
on the vehicle harness side of the ignition switch electrical connector to the corresponding
battery positive voltage terminal on the ignition switch. Refer to
Using Fused Jumper Wires
in Wiring Systems.
- Probe the ignition 1 voltage terminal on the ignition switch with
a test lamp that is connected to a good ground. Refer to
Probing Electrical Connectors
and
Troubleshooting with a Test Lamp
in Wiring Systems.
Does the test lamp illuminate?
| Go to
Step 33
| Go to
Step 8
|
8
|
- Turn OFF the ignition.
- Disconnect the negative battery cable at the battery. Refer to
Battery Negative Cable Disconnection and Connection
in
Engine Electrical.
- Disconnect the underhood fuse block electrical connector that contains
the ignition 1 voltage circuit from the ignition switch.
- Connect the negative battery cable to the battery.
- Probe the ignition 1 voltage circuit of the ignition relay at the
underhood fuse block electrical connector with a test lamp that is connected to
a good ground. Refer to
Probing Electrical Connectors
and
Troubleshooting with a Test Lamp
in Wiring Systems.
Does the test lamp illuminate?
| Go to
Step 31
| Go to
Step 9
|
9
| Test the ignition 1 voltage bus bar circuit of the ignition relay in
the underhood fuse block for a short to battery positive voltage. Refer to
Circuit Testing
in Wiring Systems.
Did you find a condition?
| Go to
Step 34
| Go to
Step 32
|
10
|
- Turn OFF the ignition.
- Inspect the 40-amp IGN B fuse in the underhood fuse block. Refer
to
Circuit Protection - Fuses
in Wiring
Systems.
Is the fuse open?
| Go to
Step 11
| Go to
Step 18
|
11
|
- Remove the 40-amp IGN B fuse from the underhood fuse block.
Notice: Refer to Test Probe Notice in the Preface section. - Probe both fuse terminals in the underhood fuse block with a test lamp that
is connected to a good ground. Refer to
Probing Electrical Connectors
and
Troubleshooting with a Test Lamp
in Wiring Systems.
Does the test lamp illuminate on at least one fuse terminal?
| Go to
Step 12
| Go to
Step 17
|
12
|
- Turn OFF the ignition.
- Disconnect the ignition switch electrical connector.
- Probe the battery positive voltage terminal on the vehicle harness side
of the ignition switch electrical connector with a test lamp that is connected to
battery positive voltage. Refer to
Probing Electrical Connectors
and
Troubleshooting with a Test Lamp
in Wiring Systems.
Does the test lamp illuminate?
| Go to
Step 28
| Go to
Step 13
|
13
|
- Turn OFF the ignition.
- Probe the ignition 1 voltage terminal on the ignition switch with
a test lamp that is connected to battery positive voltage. Refer to
Probing Electrical Connectors
and
Troubleshooting with a Test Lamp
in Wiring Systems.
Does the test lamp illuminate?
| Go to
Step 33
| Go to
Step 14
|
14
|
- Turn OFF the ignition.
- Disconnect the negative battery cable at the battery. Refer to
Battery Negative Cable Disconnection and Connection
in
Engine Electrical.
- Disconnect the underhood fuse block electrical connector that contains
the ignition 1 voltage circuit from the ignition switch.
- Connect the negative battery cable to the battery.
- Probe the ignition 1 voltage circuit of the ignition relay at the
underhood fuse block electrical connector with a test lamp that is connected to
battery positive voltage. Refer to
Probing Electrical Connectors
and
Troubleshooting with a Test Lamp
in Wiring Systems.
Does the test lamp illuminate?
| Go to
Step 29
| Go to
Step 15
|
15
| Test the ignition 1 voltage bus bar circuit for the ignition relay in
the underhood fuse block for a short to ground. Refer to
Circuit Testing
in Wiring Systems.
Did you find a condition?
| Go to
Step 34
| Go to
Step 16
|
16
| Test the battery positive voltage bus bar circuit of the underhood fuse block
that leads from the 40-amp IGN B fuse to the ignition switch for a short
to ground. Refer to
Circuit Testing
in Wiring
Systems.
Did you find a condition?
| Go to
Step 34
| Go to
Step 32
|
17
|
- Turn OFF the ignition.
- Probe the mounting stud for the battery positive cable at the underhood
fuse block with a test lamp that is connected to a good ground. Refer to
Probing Electrical Connectors
and
Troubleshooting with a Test Lamp
in Wiring Systems.
Does the test lamp illuminate?
| Go to
Step 34
| Go to
Diagnostic System Check - Engine Electrical
in Engine Electrical
|
18
|
- Turn OFF the ignition.
- Remove the ignition relay from the underhood fuse block with the J 43244
. Refer to
Relay Replacement
in Wiring Systems.
Notice: Refer to Test Probe Notice in the Preface section. - Probe the battery positive voltage circuit of the ignition relay at the underhood
fuse block with a test lamp that is connected to a good ground. Refer to
Probing Electrical Connectors
and
Troubleshooting with a Test Lamp
in Wiring Systems.
Does the test lamp illuminate?
| Go to
Step 19
| Go to
Step 34
|
19
|
- Turn ON the ignition, with the engine OFF.
- Probe the ignition 1 voltage circuit of the ignition relay at the
underhood fuse block with a test lamp that is connected to a good ground. Refer
to
Probing Electrical Connectors
and
Troubleshooting with a Test Lamp
in Wiring Systems.
Does the test lamp illuminate?
| Go to
Step 24
| Go to
Step 20
|
20
|
- Turn OFF the ignition.
- Disconnect the ignition switch electrical connector.
- Probe the battery positive voltage circuit from the 40-amp IGN B
fuse on the vehicle wire harness side of the ignition switch electrical connector
with a test lamp that is connected to a good ground. Refer to
Probing Electrical Connectors
and
Troubleshooting with a Test Lamp
in Wiring Systems.
Does the test lamp illuminate?
| Go to
Step 22
| Go to
Step 21
|
21
|
- Turn OFF the ignition.
- Disconnect the negative battery cable at the battery. Refer to
Battery Negative Cable Disconnection and Connection
in
Engine Electrical.
- Disconnect the underhood fuse block electrical connector that contains
the battery positive voltage circuit from the 40-amp IGN B fuse.
- Test the battery positive voltage circuit between the underhood fuse
block and the ignition switch for a high resistance or an open. Refer to
Circuit Testing
and
Wiring Repairs
in Wiring Systems.
Did you find and correct the condition?
| Go to
Step 35
| Go to
Step 34
|
22
|
- Turn OFF the ignition.
- Connect a 20-amp fused jumper wire from the battery positive voltage terminal
on the vehicle harness side of the ignition switch electrical connector to the corresponding
battery positive voltage terminal on the ignition switch. Refer to
Using Fused Jumper Wires
in Wiring Systems.
- Turn ON the ignition, with the engine OFF.
- Probe the ignition 1 voltage circuit of the ignition relay at
the ignition switch with a test lamp that is connected to a good ground. Refer to
Probing Electrical Connectors
and
Troubleshooting with a Test Lamp
in Wiring Systems.
Does the test lamp illuminate?
| Go to
Step 23
| Go to
Step 33
|
23
|
- Turn OFF the ignition.
- Connect the ignition switch electrical connector.
- Disconnect the negative battery cable at the battery. Refer to
Battery Negative Cable Disconnection and Connection
in
Engine Electrical.
- Disconnect the underhood fuse block electrical connector that contains
the ignition 1 voltage circuit from the ignition switch to the ignition relay.
- Connect the negative battery cable to the battery.
- Turn ON the ignition, with the engine OFF.
- Probe the ignition 1 voltage circuit between the ignition switch
and the underhood fuse block at the underhood fuse block electrical connector
with a test lamp that is connected to a good ground. Refer to
Probing Electrical Connectors
and
Troubleshooting with a Test Lamp
in Wiring Systems.
Does the test lamp illuminate?
| Go to
Step 34
| Go to
Step 30
|
24
|
- Turn ON the ignition, with the engine OFF.
- Probe the coil ground circuit of the ignition relay at the underhood fuse
block with a test lamp that is connected to battery voltage. Refer to
Probing Electrical Connectors
and
Troubleshooting with a Test Lamp
in Wiring Systems.
Does the test lamp illuminate?
| Go to
Step 26
| Go to
Step 25
|
25
|
- Turn OFF the ignition.
- Disconnect the negative battery cable at the battery. Refer to
Battery Negative Cable Disconnection and Connection
in
Engine Electrical.
- Disconnect the underhood fuse block electrical connectors.
- Test the coil ground circuit of the ignition relay at the underhood fuse
block electrical connector for a high resistance or an open. Refer to
Circuit Testing
and
Wiring Repairs
in Wiring Systems.
Did you find and correct the condition?
| Go to
Step 35
| Go to
Step 34
|
26
|
- Turn OFF the ignition.
- Connect a 20-amp fused jumper wire from the battery positive voltage circuit
terminal at the underhood fuse block to the relay load circuit at the underhood fuse
block. Refer to
Using Fused Jumper Wires
in Wiring Systems.
- Probe the following fuses with a test lamp that is connected to a good
ground:
Does the test lamp illuminate on at least one test point of each fuse?
| Go to
Step 27
| Go to
Step 34
|
27
| Test for an intermittent and for a poor connection at the underhood fuse block
ignition relay location. Refer to
Testing for Intermittent Conditions and Poor Connections
in Wiring Systems.
Did you find a condition?
| Go to
Step 34
| Go to
Step 32
|
28
| Repair the short to ground in the battery positive voltage circuit between the
underhood fuse block and the ignition switch. Refer to
Wiring Repairs
in Wiring Systems.
Did you complete the repair?
| Go to
Step 35
| --
|
29
| Repair the short to ground in the ignition 1 voltage circuit between
the ignition switch and the underhood fuse block. Refer to
Wiring Repairs
in Wiring Systems.
Did you complete the repair?
| Go to
Step 35
| --
|
30
| Repair the high resistance or an open in the ignition 1 voltage circuit
between the ignition switch and the underhood fuse block. Refer to
Wiring Repairs
in Wiring Systems.
Did you complete the repair?
| Go to
Step 35
| --
|
31
| Repair the short to battery positive voltage in the ignition 1 voltage
circuit between the ignition switch and the underhood fuse block. Refer to
Wiring Repairs
in Wiring Systems.
Did you complete the repair?
| Go to
Step 35
| --
|
32
| Replace the ignition relay. Refer to
Relay Replacement
in Wiring Systems.
Did you complete the replacement?
| Go to
Step 35
| --
|
33
| Replace the ignition switch. Refer to
Ignition and Start Switch Replacement
in Steering Wheel and Column.
Did you complete the replacement?
| Go to
Step 35
| --
|
34
| Replace the underhood fuse block. Refer to
Underhood Electrical Center or Junction Block Replacement
in Wiring Systems.
Did you complete the replacement?
| Go to
Step 35
| --
|
35
|
- Replace any open fuses.
- Turn OFF the ignition for 30 seconds.
- Attempt to start the engine.
Does the engine start and run?
| Go to
Step 36
| Go to
Engine Cranks but Does Not Run
|
36
|
- Clear the DTCs with a scan tool.
- Operate the vehicle for 5 minutes.
Does a DTC set during this ignition cycle?
| Go to
Diagnostic Trouble Code (DTC) List
| System OK
|